(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.MiniSearch = factory());
})(this, (function () { 'use strict';

    /******************************************************************************
    Copyright (c) Microsoft Corporation.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
    PERFORMANCE OF THIS SOFTWARE.
    ***************************************************************************** */
    /* global Reflect, Promise, SuppressedError, Symbol */


    var __assign = function() {
        __assign = Object.assign || function __assign(t) {
            for (var s, i = 1, n = arguments.length; i < n; i++) {
                s = arguments[i];
                for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
            }
            return t;
        };
        return __assign.apply(this, arguments);
    };

    function __awaiter(thisArg, _arguments, P, generator) {
        function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
        return new (P || (P = Promise))(function (resolve, reject) {
            function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
            function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
            function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
            step((generator = generator.apply(thisArg, _arguments || [])).next());
        });
    }

    function __generator(thisArg, body) {
        var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
        return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
        function verb(n) { return function (v) { return step([n, v]); }; }
        function step(op) {
            if (f) throw new TypeError("Generator is already executing.");
            while (g && (g = 0, op[0] && (_ = 0)), _) try {
                if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
                if (y = 0, t) op = [op[0] & 2, t.value];
                switch (op[0]) {
                    case 0: case 1: t = op; break;
                    case 4: _.label++; return { value: op[1], done: false };
                    case 5: _.label++; y = op[1]; op = [0]; continue;
                    case 7: op = _.ops.pop(); _.trys.pop(); continue;
                    default:
                        if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                        if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                        if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                        if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                        if (t[2]) _.ops.pop();
                        _.trys.pop(); continue;
                }
                op = body.call(thisArg, _);
            } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
            if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
        }
    }

    function __values(o) {
        var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
        if (m) return m.call(o);
        if (o && typeof o.length === "number") return {
            next: function () {
                if (o && i >= o.length) o = void 0;
                return { value: o && o[i++], done: !o };
            }
        };
        throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
    }

    function __read(o, n) {
        var m = typeof Symbol === "function" && o[Symbol.iterator];
        if (!m) return o;
        var i = m.call(o), r, ar = [], e;
        try {
            while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
        }
        catch (error) { e = { error: error }; }
        finally {
            try {
                if (r && !r.done && (m = i["return"])) m.call(i);
            }
            finally { if (e) throw e.error; }
        }
        return ar;
    }

    typeof SuppressedError === "function" ? SuppressedError : function (error, suppressed, message) {
        var e = new Error(message);
        return e.name = "SuppressedError", e.error = error, e.suppressed = suppressed, e;
    };

    /** @ignore */
    var ENTRIES = 'ENTRIES';
    /** @ignore */
    var KEYS = 'KEYS';
    /** @ignore */
    var VALUES = 'VALUES';
    /** @ignore */
    var LEAF = '';
    /**
     * @private
     */
    var TreeIterator = /** @class */ (function () {
        function TreeIterator(set, type) {
            var node = set._tree;
            var keys = Array.from(node.keys());
            this.set = set;
            this._type = type;
            this._path = keys.length > 0 ? [{ node: node, keys: keys }] : [];
        }
        TreeIterator.prototype.next = function () {
            var value = this.dive();
            this.backtrack();
            return value;
        };
        TreeIterator.prototype.dive = function () {
            if (this._path.length === 0) {
                return { done: true, value: undefined };
            }
            var _a = last$1(this._path), node = _a.node, keys = _a.keys;
            if (last$1(keys) === LEAF) {
                return { done: false, value: this.result() };
            }
            var child = node.get(last$1(keys));
            this._path.push({ node: child, keys: Array.from(child.keys()) });
            return this.dive();
        };
        TreeIterator.prototype.backtrack = function () {
            if (this._path.length === 0) {
                return;
            }
            var keys = last$1(this._path).keys;
            keys.pop();
            if (keys.length > 0) {
                return;
            }
            this._path.pop();
            this.backtrack();
        };
        TreeIterator.prototype.key = function () {
            return this.set._prefix + this._path
                .map(function (_a) {
                var keys = _a.keys;
                return last$1(keys);
            })
                .filter(function (key) { return key !== LEAF; })
                .join('');
        };
        TreeIterator.prototype.value = function () {
            return last$1(this._path).node.get(LEAF);
        };
        TreeIterator.prototype.result = function () {
            switch (this._type) {
                case VALUES: return this.value();
                case KEYS: return this.key();
                default: return [this.key(), this.value()];
            }
        };
        TreeIterator.prototype[Symbol.iterator] = function () {
            return this;
        };
        return TreeIterator;
    }());
    var last$1 = function (array) {
        return array[array.length - 1];
    };

    /**
     * @ignore
     */
    var fuzzySearch = function (node, query, maxDistance) {
        var results = new Map();
        if (query === undefined)
            return results;
        // Number of columns in the Levenshtein matrix.
        var n = query.length + 1;
        // Matching terms can never be longer than N + maxDistance.
        var m = n + maxDistance;
        // Fill first matrix row and column with numbers: 0 1 2 3 ...
        var matrix = new Uint8Array(m * n).fill(maxDistance + 1);
        for (var j = 0; j < n; ++j)
            matrix[j] = j;
        for (var i = 1; i < m; ++i)
            matrix[i * n] = i;
        recurse(node, query, maxDistance, results, matrix, 1, n, '');
        return results;
    };
    // Modified version of http://stevehanov.ca/blog/?id=114
    // This builds a Levenshtein matrix for a given query and continuously updates
    // it for nodes in the radix tree that fall within the given maximum edit
    // distance. Keeping the same matrix around is beneficial especially for larger
    // edit distances.
    //
    //           k   a   t   e   <-- query
    //       0   1   2   3   4
    //   c   1   1   2   3   4
    //   a   2   2   1   2   3
    //   t   3   3   2   1  [2]  <-- edit distance
    //   ^
    //   ^ term in radix tree, rows are added and removed as needed
    var recurse = function (node, query, maxDistance, results, matrix, m, n, prefix) {
        var e_1, _a;
        var offset = m * n;
        try {
            key: for (var _b = __values(node.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                var key = _c.value;
                if (key === LEAF) {
                    // We've reached a leaf node. Check if the edit distance acceptable and
                    // store the result if it is.
                    var distance = matrix[offset - 1];
                    if (distance <= maxDistance) {
                        results.set(prefix, [node.get(key), distance]);
                    }
                }
                else {
                    // Iterate over all characters in the key. Update the Levenshtein matrix
                    // and check if the minimum distance in the last row is still within the
                    // maximum edit distance. If it is, we can recurse over all child nodes.
                    var i = m;
                    for (var pos = 0; pos < key.length; ++pos, ++i) {
                        var char = key[pos];
                        var thisRowOffset = n * i;
                        var prevRowOffset = thisRowOffset - n;
                        // Set the first column based on the previous row, and initialize the
                        // minimum distance in the current row.
                        var minDistance = matrix[thisRowOffset];
                        var jmin = Math.max(0, i - maxDistance - 1);
                        var jmax = Math.min(n - 1, i + maxDistance);
                        // Iterate over remaining columns (characters in the query).
                        for (var j = jmin; j < jmax; ++j) {
                            var different = char !== query[j];
                            // It might make sense to only read the matrix positions used for
                            // deletion/insertion if the characters are different. But we want to
                            // avoid conditional reads for performance reasons.
                            var rpl = matrix[prevRowOffset + j] + +different;
                            var del = matrix[prevRowOffset + j + 1] + 1;
                            var ins = matrix[thisRowOffset + j] + 1;
                            var dist = matrix[thisRowOffset + j + 1] = Math.min(rpl, del, ins);
                            if (dist < minDistance)
                                minDistance = dist;
                        }
                        // Because distance will never decrease, we can stop. There will be no
                        // matching child nodes.
                        if (minDistance > maxDistance) {
                            continue key;
                        }
                    }
                    recurse(node.get(key), query, maxDistance, results, matrix, i, n, prefix + key);
                }
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
    };

    /**
     * A class implementing the same interface as a standard JavaScript
     * [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
     * with string keys, but adding support for efficiently searching entries with
     * prefix or fuzzy search. This class is used internally by {@link MiniSearch}
     * as the inverted index data structure. The implementation is a radix tree
     * (compressed prefix tree).
     *
     * Since this class can be of general utility beyond _MiniSearch_, it is
     * exported by the `minisearch` package and can be imported (or required) as
     * `minisearch/SearchableMap`.
     *
     * @typeParam T  The type of the values stored in the map.
     */
    var SearchableMap = /** @class */ (function () {
        /**
         * The constructor is normally called without arguments, creating an empty
         * map. In order to create a {@link SearchableMap} from an iterable or from an
         * object, check {@link SearchableMap.from} and {@link
         * SearchableMap.fromObject}.
         *
         * The constructor arguments are for internal use, when creating derived
         * mutable views of a map at a prefix.
         */
        function SearchableMap(tree, prefix) {
            if (tree === void 0) { tree = new Map(); }
            if (prefix === void 0) { prefix = ''; }
            this._size = undefined;
            this._tree = tree;
            this._prefix = prefix;
        }
        /**
         * Creates and returns a mutable view of this {@link SearchableMap},
         * containing only entries that share the given prefix.
         *
         * ### Usage:
         *
         * ```javascript
         * let map = new SearchableMap()
         * map.set("unicorn", 1)
         * map.set("universe", 2)
         * map.set("university", 3)
         * map.set("unique", 4)
         * map.set("hello", 5)
         *
         * let uni = map.atPrefix("uni")
         * uni.get("unique") // => 4
         * uni.get("unicorn") // => 1
         * uni.get("hello") // => undefined
         *
         * let univer = map.atPrefix("univer")
         * univer.get("unique") // => undefined
         * univer.get("universe") // => 2
         * univer.get("university") // => 3
         * ```
         *
         * @param prefix  The prefix
         * @return A {@link SearchableMap} representing a mutable view of the original
         * Map at the given prefix
         */
        SearchableMap.prototype.atPrefix = function (prefix) {
            var e_1, _a;
            if (!prefix.startsWith(this._prefix)) {
                throw new Error('Mismatched prefix');
            }
            var _b = __read(trackDown(this._tree, prefix.slice(this._prefix.length)), 2), node = _b[0], path = _b[1];
            if (node === undefined) {
                var _c = __read(last(path), 2), parentNode = _c[0], key = _c[1];
                try {
                    for (var _d = __values(parentNode.keys()), _e = _d.next(); !_e.done; _e = _d.next()) {
                        var k = _e.value;
                        if (k !== LEAF && k.startsWith(key)) {
                            var node_1 = new Map();
                            node_1.set(k.slice(key.length), parentNode.get(k));
                            return new SearchableMap(node_1, prefix);
                        }
                    }
                }
                catch (e_1_1) { e_1 = { error: e_1_1 }; }
                finally {
                    try {
                        if (_e && !_e.done && (_a = _d.return)) _a.call(_d);
                    }
                    finally { if (e_1) throw e_1.error; }
                }
            }
            return new SearchableMap(node, prefix);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear
         */
        SearchableMap.prototype.clear = function () {
            this._size = undefined;
            this._tree.clear();
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete
         * @param key  Key to delete
         */
        SearchableMap.prototype.delete = function (key) {
            this._size = undefined;
            return remove(this._tree, key);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/entries
         * @return An iterator iterating through `[key, value]` entries.
         */
        SearchableMap.prototype.entries = function () {
            return new TreeIterator(this, ENTRIES);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach
         * @param fn  Iteration function
         */
        SearchableMap.prototype.forEach = function (fn) {
            var e_2, _a;
            try {
                for (var _b = __values(this), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var _d = __read(_c.value, 2), key = _d[0], value = _d[1];
                    fn(key, value, this);
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_2) throw e_2.error; }
            }
        };
        /**
         * Returns a Map of all the entries that have a key within the given edit
         * distance from the search key. The keys of the returned Map are the matching
         * keys, while the values are two-element arrays where the first element is
         * the value associated to the key, and the second is the edit distance of the
         * key to the search key.
         *
         * ### Usage:
         *
         * ```javascript
         * let map = new SearchableMap()
         * map.set('hello', 'world')
         * map.set('hell', 'yeah')
         * map.set('ciao', 'mondo')
         *
         * // Get all entries that match the key 'hallo' with a maximum edit distance of 2
         * map.fuzzyGet('hallo', 2)
         * // => Map(2) { 'hello' => ['world', 1], 'hell' => ['yeah', 2] }
         *
         * // In the example, the "hello" key has value "world" and edit distance of 1
         * // (change "e" to "a"), the key "hell" has value "yeah" and edit distance of 2
         * // (change "e" to "a", delete "o")
         * ```
         *
         * @param key  The search key
         * @param maxEditDistance  The maximum edit distance (Levenshtein)
         * @return A Map of the matching keys to their value and edit distance
         */
        SearchableMap.prototype.fuzzyGet = function (key, maxEditDistance) {
            return fuzzySearch(this._tree, key, maxEditDistance);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get
         * @param key  Key to get
         * @return Value associated to the key, or `undefined` if the key is not
         * found.
         */
        SearchableMap.prototype.get = function (key) {
            var node = lookup(this._tree, key);
            return node !== undefined ? node.get(LEAF) : undefined;
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has
         * @param key  Key
         * @return True if the key is in the map, false otherwise
         */
        SearchableMap.prototype.has = function (key) {
            var node = lookup(this._tree, key);
            return node !== undefined && node.has(LEAF);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/keys
         * @return An `Iterable` iterating through keys
         */
        SearchableMap.prototype.keys = function () {
            return new TreeIterator(this, KEYS);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set
         * @param key  Key to set
         * @param value  Value to associate to the key
         * @return The {@link SearchableMap} itself, to allow chaining
         */
        SearchableMap.prototype.set = function (key, value) {
            if (typeof key !== 'string') {
                throw new Error('key must be a string');
            }
            this._size = undefined;
            var node = createPath(this._tree, key);
            node.set(LEAF, value);
            return this;
        };
        Object.defineProperty(SearchableMap.prototype, "size", {
            /**
             * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/size
             */
            get: function () {
                if (this._size) {
                    return this._size;
                }
                /** @ignore */
                this._size = 0;
                var iter = this.entries();
                while (!iter.next().done)
                    this._size += 1;
                return this._size;
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Updates the value at the given key using the provided function. The function
         * is called with the current value at the key, and its return value is used as
         * the new value to be set.
         *
         * ### Example:
         *
         * ```javascript
         * // Increment the current value by one
         * searchableMap.update('somekey', (currentValue) => currentValue == null ? 0 : currentValue + 1)
         * ```
         *
         * If the value at the given key is or will be an object, it might not require
         * re-assignment. In that case it is better to use `fetch()`, because it is
         * faster.
         *
         * @param key  The key to update
         * @param fn  The function used to compute the new value from the current one
         * @return The {@link SearchableMap} itself, to allow chaining
         */
        SearchableMap.prototype.update = function (key, fn) {
            if (typeof key !== 'string') {
                throw new Error('key must be a string');
            }
            this._size = undefined;
            var node = createPath(this._tree, key);
            node.set(LEAF, fn(node.get(LEAF)));
            return this;
        };
        /**
         * Fetches the value of the given key. If the value does not exist, calls the
         * given function to create a new value, which is inserted at the given key
         * and subsequently returned.
         *
         * ### Example:
         *
         * ```javascript
         * const map = searchableMap.fetch('somekey', () => new Map())
         * map.set('foo', 'bar')
         * ```
         *
         * @param key  The key to update
         * @param defaultValue  A function that creates a new value if the key does not exist
         * @return The existing or new value at the given key
         */
        SearchableMap.prototype.fetch = function (key, initial) {
            if (typeof key !== 'string') {
                throw new Error('key must be a string');
            }
            this._size = undefined;
            var node = createPath(this._tree, key);
            var value = node.get(LEAF);
            if (value === undefined) {
                node.set(LEAF, value = initial());
            }
            return value;
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/values
         * @return An `Iterable` iterating through values.
         */
        SearchableMap.prototype.values = function () {
            return new TreeIterator(this, VALUES);
        };
        /**
         * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@iterator
         */
        SearchableMap.prototype[Symbol.iterator] = function () {
            return this.entries();
        };
        /**
         * Creates a {@link SearchableMap} from an `Iterable` of entries
         *
         * @param entries  Entries to be inserted in the {@link SearchableMap}
         * @return A new {@link SearchableMap} with the given entries
         */
        SearchableMap.from = function (entries) {
            var e_3, _a;
            var tree = new SearchableMap();
            try {
                for (var entries_1 = __values(entries), entries_1_1 = entries_1.next(); !entries_1_1.done; entries_1_1 = entries_1.next()) {
                    var _b = __read(entries_1_1.value, 2), key = _b[0], value = _b[1];
                    tree.set(key, value);
                }
            }
            catch (e_3_1) { e_3 = { error: e_3_1 }; }
            finally {
                try {
                    if (entries_1_1 && !entries_1_1.done && (_a = entries_1.return)) _a.call(entries_1);
                }
                finally { if (e_3) throw e_3.error; }
            }
            return tree;
        };
        /**
         * Creates a {@link SearchableMap} from the iterable properties of a JavaScript object
         *
         * @param object  Object of entries for the {@link SearchableMap}
         * @return A new {@link SearchableMap} with the given entries
         */
        SearchableMap.fromObject = function (object) {
            return SearchableMap.from(Object.entries(object));
        };
        return SearchableMap;
    }());
    var trackDown = function (tree, key, path) {
        var e_4, _a;
        if (path === void 0) { path = []; }
        if (key.length === 0 || tree == null) {
            return [tree, path];
        }
        try {
            for (var _b = __values(tree.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                var k = _c.value;
                if (k !== LEAF && key.startsWith(k)) {
                    path.push([tree, k]); // performance: update in place
                    return trackDown(tree.get(k), key.slice(k.length), path);
                }
            }
        }
        catch (e_4_1) { e_4 = { error: e_4_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_4) throw e_4.error; }
        }
        path.push([tree, key]); // performance: update in place
        return trackDown(undefined, '', path);
    };
    var lookup = function (tree, key) {
        var e_5, _a;
        if (key.length === 0 || tree == null) {
            return tree;
        }
        try {
            for (var _b = __values(tree.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                var k = _c.value;
                if (k !== LEAF && key.startsWith(k)) {
                    return lookup(tree.get(k), key.slice(k.length));
                }
            }
        }
        catch (e_5_1) { e_5 = { error: e_5_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_5) throw e_5.error; }
        }
    };
    // Create a path in the radix tree for the given key, and returns the deepest
    // node. This function is in the hot path for indexing. It avoids unnecessary
    // string operations and recursion for performance.
    var createPath = function (node, key) {
        var e_6, _a;
        var keyLength = key.length;
        outer: for (var pos = 0; node && pos < keyLength;) {
            try {
                for (var _b = (e_6 = void 0, __values(node.keys())), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var k = _c.value;
                    // Check whether this key is a candidate: the first characters must match.
                    if (k !== LEAF && key[pos] === k[0]) {
                        var len = Math.min(keyLength - pos, k.length);
                        // Advance offset to the point where key and k no longer match.
                        var offset = 1;
                        while (offset < len && key[pos + offset] === k[offset])
                            ++offset;
                        var child_1 = node.get(k);
                        if (offset === k.length) {
                            // The existing key is shorter than the key we need to create.
                            node = child_1;
                        }
                        else {
                            // Partial match: we need to insert an intermediate node to contain
                            // both the existing subtree and the new node.
                            var intermediate = new Map();
                            intermediate.set(k.slice(offset), child_1);
                            node.set(key.slice(pos, pos + offset), intermediate);
                            node.delete(k);
                            node = intermediate;
                        }
                        pos += offset;
                        continue outer;
                    }
                }
            }
            catch (e_6_1) { e_6 = { error: e_6_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_6) throw e_6.error; }
            }
            // Create a final child node to contain the final suffix of the key.
            var child = new Map();
            node.set(key.slice(pos), child);
            return child;
        }
        return node;
    };
    var remove = function (tree, key) {
        var _a = __read(trackDown(tree, key), 2), node = _a[0], path = _a[1];
        if (node === undefined) {
            return;
        }
        node.delete(LEAF);
        if (node.size === 0) {
            cleanup(path);
        }
        else if (node.size === 1) {
            var _b = __read(node.entries().next().value, 2), key_1 = _b[0], value = _b[1];
            merge(path, key_1, value);
        }
    };
    var cleanup = function (path) {
        if (path.length === 0) {
            return;
        }
        var _a = __read(last(path), 2), node = _a[0], key = _a[1];
        node.delete(key);
        if (node.size === 0) {
            cleanup(path.slice(0, -1));
        }
        else if (node.size === 1) {
            var _b = __read(node.entries().next().value, 2), key_2 = _b[0], value = _b[1];
            if (key_2 !== LEAF) {
                merge(path.slice(0, -1), key_2, value);
            }
        }
    };
    var merge = function (path, key, value) {
        if (path.length === 0) {
            return;
        }
        var _a = __read(last(path), 2), node = _a[0], nodeKey = _a[1];
        node.set(nodeKey + key, value);
        node.delete(nodeKey);
    };
    var last = function (array) {
        return array[array.length - 1];
    };

    var _a;
    var OR = 'or';
    var AND = 'and';
    var AND_NOT = 'and_not';
    /**
     * {@link MiniSearch} is the main entrypoint class, implementing a full-text
     * search engine in memory.
     *
     * @typeParam T  The type of the documents being indexed.
     *
     * ### Basic example:
     *
     * ```javascript
     * const documents = [
     *   {
     *     id: 1,
     *     title: 'Moby Dick',
     *     text: 'Call me Ishmael. Some years ago...',
     *     category: 'fiction'
     *   },
     *   {
     *     id: 2,
     *     title: 'Zen and the Art of Motorcycle Maintenance',
     *     text: 'I can see by my watch...',
     *     category: 'fiction'
     *   },
     *   {
     *     id: 3,
     *     title: 'Neuromancer',
     *     text: 'The sky above the port was...',
     *     category: 'fiction'
     *   },
     *   {
     *     id: 4,
     *     title: 'Zen and the Art of Archery',
     *     text: 'At first sight it must seem...',
     *     category: 'non-fiction'
     *   },
     *   // ...and more
     * ]
     *
     * // Create a search engine that indexes the 'title' and 'text' fields for
     * // full-text search. Search results will include 'title' and 'category' (plus the
     * // id field, that is always stored and returned)
     * const miniSearch = new MiniSearch({
     *   fields: ['title', 'text'],
     *   storeFields: ['title', 'category']
     * })
     *
     * // Add documents to the index
     * miniSearch.addAll(documents)
     *
     * // Search for documents:
     * let results = miniSearch.search('zen art motorcycle')
     * // => [
     * //   { id: 2, title: 'Zen and the Art of Motorcycle Maintenance', category: 'fiction', score: 2.77258 },
     * //   { id: 4, title: 'Zen and the Art of Archery', category: 'non-fiction', score: 1.38629 }
     * // ]
     * ```
     */
    var MiniSearch = /** @class */ (function () {
        /**
         * @param options  Configuration options
         *
         * ### Examples:
         *
         * ```javascript
         * // Create a search engine that indexes the 'title' and 'text' fields of your
         * // documents:
         * const miniSearch = new MiniSearch({ fields: ['title', 'text'] })
         * ```
         *
         * ### ID Field:
         *
         * ```javascript
         * // Your documents are assumed to include a unique 'id' field, but if you want
         * // to use a different field for document identification, you can set the
         * // 'idField' option:
         * const miniSearch = new MiniSearch({ idField: 'key', fields: ['title', 'text'] })
         * ```
         *
         * ### Options and defaults:
         *
         * ```javascript
         * // The full set of options (here with their default value) is:
         * const miniSearch = new MiniSearch({
         *   // idField: field that uniquely identifies a document
         *   idField: 'id',
         *
         *   // extractField: function used to get the value of a field in a document.
         *   // By default, it assumes the document is a flat object with field names as
         *   // property keys and field values as string property values, but custom logic
         *   // can be implemented by setting this option to a custom extractor function.
         *   extractField: (document, fieldName) => document[fieldName],
         *
         *   // tokenize: function used to split fields into individual terms. By
         *   // default, it is also used to tokenize search queries, unless a specific
         *   // `tokenize` search option is supplied. When tokenizing an indexed field,
         *   // the field name is passed as the second argument.
         *   tokenize: (string, _fieldName) => string.split(SPACE_OR_PUNCTUATION),
         *
         *   // processTerm: function used to process each tokenized term before
         *   // indexing. It can be used for stemming and normalization. Return a falsy
         *   // value in order to discard a term. By default, it is also used to process
         *   // search queries, unless a specific `processTerm` option is supplied as a
         *   // search option. When processing a term from a indexed field, the field
         *   // name is passed as the second argument.
         *   processTerm: (term, _fieldName) => term.toLowerCase(),
         *
         *   // searchOptions: default search options, see the `search` method for
         *   // details
         *   searchOptions: undefined,
         *
         *   // fields: document fields to be indexed. Mandatory, but not set by default
         *   fields: undefined
         *
         *   // storeFields: document fields to be stored and returned as part of the
         *   // search results.
         *   storeFields: []
         * })
         * ```
         */
        function MiniSearch(options) {
            if ((options === null || options === void 0 ? void 0 : options.fields) == null) {
                throw new Error('MiniSearch: option "fields" must be provided');
            }
            var autoVacuum = (options.autoVacuum == null || options.autoVacuum === true) ? defaultAutoVacuumOptions : options.autoVacuum;
            this._options = __assign(__assign(__assign({}, defaultOptions), options), { autoVacuum: autoVacuum, searchOptions: __assign(__assign({}, defaultSearchOptions), (options.searchOptions || {})), autoSuggestOptions: __assign(__assign({}, defaultAutoSuggestOptions), (options.autoSuggestOptions || {})) });
            this._index = new SearchableMap();
            this._documentCount = 0;
            this._documentIds = new Map();
            this._idToShortId = new Map();
            // Fields are defined during initialization, don't change, are few in
            // number, rarely need iterating over, and have string keys. Therefore in
            // this case an object is a better candidate than a Map to store the mapping
            // from field key to ID.
            this._fieldIds = {};
            this._fieldLength = new Map();
            this._avgFieldLength = [];
            this._nextId = 0;
            this._storedFields = new Map();
            this._dirtCount = 0;
            this._currentVacuum = null;
            this._enqueuedVacuum = null;
            this._enqueuedVacuumConditions = defaultVacuumConditions;
            this.addFields(this._options.fields);
        }
        /**
         * Adds a document to the index
         *
         * @param document  The document to be indexed
         */
        MiniSearch.prototype.add = function (document) {
            var e_1, _a, e_2, _b, e_3, _c;
            var _d = this._options, extractField = _d.extractField, tokenize = _d.tokenize, processTerm = _d.processTerm, fields = _d.fields, idField = _d.idField;
            var id = extractField(document, idField);
            if (id == null) {
                throw new Error("MiniSearch: document does not have ID field \"".concat(idField, "\""));
            }
            if (this._idToShortId.has(id)) {
                throw new Error("MiniSearch: duplicate ID ".concat(id));
            }
            var shortDocumentId = this.addDocumentId(id);
            this.saveStoredFields(shortDocumentId, document);
            try {
                for (var fields_1 = __values(fields), fields_1_1 = fields_1.next(); !fields_1_1.done; fields_1_1 = fields_1.next()) {
                    var field = fields_1_1.value;
                    var fieldValue = extractField(document, field);
                    if (fieldValue == null)
                        continue;
                    var tokens = tokenize(fieldValue.toString(), field);
                    var fieldId = this._fieldIds[field];
                    var uniqueTerms = new Set(tokens).size;
                    this.addFieldLength(shortDocumentId, fieldId, this._documentCount - 1, uniqueTerms);
                    try {
                        for (var tokens_1 = (e_2 = void 0, __values(tokens)), tokens_1_1 = tokens_1.next(); !tokens_1_1.done; tokens_1_1 = tokens_1.next()) {
                            var term = tokens_1_1.value;
                            var processedTerm = processTerm(term, field);
                            if (Array.isArray(processedTerm)) {
                                try {
                                    for (var processedTerm_1 = (e_3 = void 0, __values(processedTerm)), processedTerm_1_1 = processedTerm_1.next(); !processedTerm_1_1.done; processedTerm_1_1 = processedTerm_1.next()) {
                                        var t = processedTerm_1_1.value;
                                        this.addTerm(fieldId, shortDocumentId, t);
                                    }
                                }
                                catch (e_3_1) { e_3 = { error: e_3_1 }; }
                                finally {
                                    try {
                                        if (processedTerm_1_1 && !processedTerm_1_1.done && (_c = processedTerm_1.return)) _c.call(processedTerm_1);
                                    }
                                    finally { if (e_3) throw e_3.error; }
                                }
                            }
                            else if (processedTerm) {
                                this.addTerm(fieldId, shortDocumentId, processedTerm);
                            }
                        }
                    }
                    catch (e_2_1) { e_2 = { error: e_2_1 }; }
                    finally {
                        try {
                            if (tokens_1_1 && !tokens_1_1.done && (_b = tokens_1.return)) _b.call(tokens_1);
                        }
                        finally { if (e_2) throw e_2.error; }
                    }
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (fields_1_1 && !fields_1_1.done && (_a = fields_1.return)) _a.call(fields_1);
                }
                finally { if (e_1) throw e_1.error; }
            }
        };
        /**
         * Adds all the given documents to the index
         *
         * @param documents  An array of documents to be indexed
         */
        MiniSearch.prototype.addAll = function (documents) {
            var e_4, _a;
            try {
                for (var documents_1 = __values(documents), documents_1_1 = documents_1.next(); !documents_1_1.done; documents_1_1 = documents_1.next()) {
                    var document_1 = documents_1_1.value;
                    this.add(document_1);
                }
            }
            catch (e_4_1) { e_4 = { error: e_4_1 }; }
            finally {
                try {
                    if (documents_1_1 && !documents_1_1.done && (_a = documents_1.return)) _a.call(documents_1);
                }
                finally { if (e_4) throw e_4.error; }
            }
        };
        /**
         * Adds all the given documents to the index asynchronously.
         *
         * Returns a promise that resolves (to `undefined`) when the indexing is done.
         * This method is useful when index many documents, to avoid blocking the main
         * thread. The indexing is performed asynchronously and in chunks.
         *
         * @param documents  An array of documents to be indexed
         * @param options  Configuration options
         * @return A promise resolving to `undefined` when the indexing is done
         */
        MiniSearch.prototype.addAllAsync = function (documents, options) {
            var _this = this;
            if (options === void 0) { options = {}; }
            var _a = options.chunkSize, chunkSize = _a === void 0 ? 10 : _a;
            var acc = { chunk: [], promise: Promise.resolve() };
            var _b = documents.reduce(function (_a, document, i) {
                var chunk = _a.chunk, promise = _a.promise;
                chunk.push(document);
                if ((i + 1) % chunkSize === 0) {
                    return {
                        chunk: [],
                        promise: promise
                            .then(function () { return new Promise(function (resolve) { return setTimeout(resolve, 0); }); })
                            .then(function () { return _this.addAll(chunk); })
                    };
                }
                else {
                    return { chunk: chunk, promise: promise };
                }
            }, acc), chunk = _b.chunk, promise = _b.promise;
            return promise.then(function () { return _this.addAll(chunk); });
        };
        /**
         * Removes the given document from the index.
         *
         * The document to remove must NOT have changed between indexing and removal,
         * otherwise the index will be corrupted.
         *
         * This method requires passing the full document to be removed (not just the
         * ID), and immediately removes the document from the inverted index, allowing
         * memory to be released. A convenient alternative is {@link
         * MiniSearch#discard}, which needs only the document ID, and has the same
         * visible effect, but delays cleaning up the index until the next vacuuming.
         *
         * @param document  The document to be removed
         */
        MiniSearch.prototype.remove = function (document) {
            var e_5, _a, e_6, _b, e_7, _c;
            var _d = this._options, tokenize = _d.tokenize, processTerm = _d.processTerm, extractField = _d.extractField, fields = _d.fields, idField = _d.idField;
            var id = extractField(document, idField);
            if (id == null) {
                throw new Error("MiniSearch: document does not have ID field \"".concat(idField, "\""));
            }
            var shortId = this._idToShortId.get(id);
            if (shortId == null) {
                throw new Error("MiniSearch: cannot remove document with ID ".concat(id, ": it is not in the index"));
            }
            try {
                for (var fields_2 = __values(fields), fields_2_1 = fields_2.next(); !fields_2_1.done; fields_2_1 = fields_2.next()) {
                    var field = fields_2_1.value;
                    var fieldValue = extractField(document, field);
                    if (fieldValue == null)
                        continue;
                    var tokens = tokenize(fieldValue.toString(), field);
                    var fieldId = this._fieldIds[field];
                    var uniqueTerms = new Set(tokens).size;
                    this.removeFieldLength(shortId, fieldId, this._documentCount, uniqueTerms);
                    try {
                        for (var tokens_2 = (e_6 = void 0, __values(tokens)), tokens_2_1 = tokens_2.next(); !tokens_2_1.done; tokens_2_1 = tokens_2.next()) {
                            var term = tokens_2_1.value;
                            var processedTerm = processTerm(term, field);
                            if (Array.isArray(processedTerm)) {
                                try {
                                    for (var processedTerm_2 = (e_7 = void 0, __values(processedTerm)), processedTerm_2_1 = processedTerm_2.next(); !processedTerm_2_1.done; processedTerm_2_1 = processedTerm_2.next()) {
                                        var t = processedTerm_2_1.value;
                                        this.removeTerm(fieldId, shortId, t);
                                    }
                                }
                                catch (e_7_1) { e_7 = { error: e_7_1 }; }
                                finally {
                                    try {
                                        if (processedTerm_2_1 && !processedTerm_2_1.done && (_c = processedTerm_2.return)) _c.call(processedTerm_2);
                                    }
                                    finally { if (e_7) throw e_7.error; }
                                }
                            }
                            else if (processedTerm) {
                                this.removeTerm(fieldId, shortId, processedTerm);
                            }
                        }
                    }
                    catch (e_6_1) { e_6 = { error: e_6_1 }; }
                    finally {
                        try {
                            if (tokens_2_1 && !tokens_2_1.done && (_b = tokens_2.return)) _b.call(tokens_2);
                        }
                        finally { if (e_6) throw e_6.error; }
                    }
                }
            }
            catch (e_5_1) { e_5 = { error: e_5_1 }; }
            finally {
                try {
                    if (fields_2_1 && !fields_2_1.done && (_a = fields_2.return)) _a.call(fields_2);
                }
                finally { if (e_5) throw e_5.error; }
            }
            this._storedFields.delete(shortId);
            this._documentIds.delete(shortId);
            this._idToShortId.delete(id);
            this._fieldLength.delete(shortId);
            this._documentCount -= 1;
        };
        /**
         * Removes all the given documents from the index. If called with no arguments,
         * it removes _all_ documents from the index.
         *
         * @param documents  The documents to be removed. If this argument is omitted,
         * all documents are removed. Note that, for removing all documents, it is
         * more efficient to call this method with no arguments than to pass all
         * documents.
         */
        MiniSearch.prototype.removeAll = function (documents) {
            var e_8, _a;
            if (documents) {
                try {
                    for (var documents_2 = __values(documents), documents_2_1 = documents_2.next(); !documents_2_1.done; documents_2_1 = documents_2.next()) {
                        var document_2 = documents_2_1.value;
                        this.remove(document_2);
                    }
                }
                catch (e_8_1) { e_8 = { error: e_8_1 }; }
                finally {
                    try {
                        if (documents_2_1 && !documents_2_1.done && (_a = documents_2.return)) _a.call(documents_2);
                    }
                    finally { if (e_8) throw e_8.error; }
                }
            }
            else if (arguments.length > 0) {
                throw new Error('Expected documents to be present. Omit the argument to remove all documents.');
            }
            else {
                this._index = new SearchableMap();
                this._documentCount = 0;
                this._documentIds = new Map();
                this._idToShortId = new Map();
                this._fieldLength = new Map();
                this._avgFieldLength = [];
                this._storedFields = new Map();
                this._nextId = 0;
            }
        };
        /**
         * Discards the document with the given ID, so it won't appear in search results
         *
         * It has the same visible effect of {@link MiniSearch.remove} (both cause the
         * document to stop appearing in searches), but a different effect on the
         * internal data structures:
         *
         *   - {@link MiniSearch#remove} requires passing the full document to be
         *   removed as argument, and removes it from the inverted index immediately.
         *
         *   - {@link MiniSearch#discard} instead only needs the document ID, and
         *   works by marking the current version of the document as discarded, so it
         *   is immediately ignored by searches. This is faster and more convenient
         *   than {@link MiniSearch#remove}, but the index is not immediately
         *   modified. To take care of that, vacuuming is performed after a certain
         *   number of documents are discarded, cleaning up the index and allowing
         *   memory to be released.
         *
         * After discarding a document, it is possible to re-add a new version, and
         * only the new version will appear in searches. In other words, discarding
         * and re-adding a document works exactly like removing and re-adding it. The
         * {@link MiniSearch.replace} method can also be used to replace a document
         * with a new version.
         *
         * #### Details about vacuuming
         *
         * Repetite calls to this method would leave obsolete document references in
         * the index, invisible to searches. Two mechanisms take care of cleaning up:
         * clean up during search, and vacuuming.
         *
         *   - Upon search, whenever a discarded ID is found (and ignored for the
         *   results), references to the discarded document are removed from the
         *   inverted index entries for the search terms. This ensures that subsequent
         *   searches for the same terms do not need to skip these obsolete references
         *   again.
         *
         *   - In addition, vacuuming is performed automatically by default (see the
         *   `autoVacuum` field in {@link Options}) after a certain number of
         *   documents are discarded. Vacuuming traverses all terms in the index,
         *   cleaning up all references to discarded documents. Vacuuming can also be
         *   triggered manually by calling {@link MiniSearch#vacuum}.
         *
         * @param id  The ID of the document to be discarded
         */
        MiniSearch.prototype.discard = function (id) {
            var _this = this;
            var shortId = this._idToShortId.get(id);
            if (shortId == null) {
                throw new Error("MiniSearch: cannot discard document with ID ".concat(id, ": it is not in the index"));
            }
            this._idToShortId.delete(id);
            this._documentIds.delete(shortId);
            this._storedFields.delete(shortId);
            (this._fieldLength.get(shortId) || []).forEach(function (fieldLength, fieldId) {
                _this.removeFieldLength(shortId, fieldId, _this._documentCount, fieldLength);
            });
            this._fieldLength.delete(shortId);
            this._documentCount -= 1;
            this._dirtCount += 1;
            this.maybeAutoVacuum();
        };
        MiniSearch.prototype.maybeAutoVacuum = function () {
            if (this._options.autoVacuum === false) {
                return;
            }
            var _a = this._options.autoVacuum, minDirtFactor = _a.minDirtFactor, minDirtCount = _a.minDirtCount, batchSize = _a.batchSize, batchWait = _a.batchWait;
            this.conditionalVacuum({ batchSize: batchSize, batchWait: batchWait }, { minDirtCount: minDirtCount, minDirtFactor: minDirtFactor });
        };
        /**
         * Discards the documents with the given IDs, so they won't appear in search
         * results
         *
         * It is equivalent to calling {@link MiniSearch#discard} for all the given
         * IDs, but with the optimization of triggering at most one automatic
         * vacuuming at the end.
         *
         * Note: to remove all documents from the index, it is faster and more
         * convenient to call {@link MiniSearch.removeAll} with no argument, instead
         * of passing all IDs to this method.
         */
        MiniSearch.prototype.discardAll = function (ids) {
            var e_9, _a;
            var autoVacuum = this._options.autoVacuum;
            try {
                this._options.autoVacuum = false;
                try {
                    for (var ids_1 = __values(ids), ids_1_1 = ids_1.next(); !ids_1_1.done; ids_1_1 = ids_1.next()) {
                        var id = ids_1_1.value;
                        this.discard(id);
                    }
                }
                catch (e_9_1) { e_9 = { error: e_9_1 }; }
                finally {
                    try {
                        if (ids_1_1 && !ids_1_1.done && (_a = ids_1.return)) _a.call(ids_1);
                    }
                    finally { if (e_9) throw e_9.error; }
                }
            }
            finally {
                this._options.autoVacuum = autoVacuum;
            }
            this.maybeAutoVacuum();
        };
        /**
         * It replaces an existing document with the given updated version
         *
         * It works by discarding the current version and adding the updated one, so
         * it is functionally equivalent to calling {@link MiniSearch#discard}
         * followed by {@link MiniSearch#add}. The ID of the updated document should
         * be the same as the original one.
         *
         * Since it uses {@link MiniSearch#discard} internally, this method relies on
         * vacuuming to clean up obsolete document references from the index, allowing
         * memory to be released (see {@link MiniSearch#discard}).
         *
         * @param updatedDocument  The updated document to replace the old version
         * with
         */
        MiniSearch.prototype.replace = function (updatedDocument) {
            var _a = this._options, idField = _a.idField, extractField = _a.extractField;
            var id = extractField(updatedDocument, idField);
            this.discard(id);
            this.add(updatedDocument);
        };
        /**
         * Triggers a manual vacuuming, cleaning up references to discarded documents
         * from the inverted index
         *
         * Vacuuming is only useful for applications that use the {@link
         * MiniSearch#discard} or {@link MiniSearch#replace} methods.
         *
         * By default, vacuuming is performed automatically when needed (controlled by
         * the `autoVacuum` field in {@link Options}), so there is usually no need to
         * call this method, unless one wants to make sure to perform vacuuming at a
         * specific moment.
         *
         * Vacuuming traverses all terms in the inverted index in batches, and cleans
         * up references to discarded documents from the posting list, allowing memory
         * to be released.
         *
         * The method takes an optional object as argument with the following keys:
         *
         *   - `batchSize`: the size of each batch (1000 by default)
         *
         *   - `batchWait`: the number of milliseconds to wait between batches (10 by
         *   default)
         *
         * On large indexes, vacuuming could have a non-negligible cost: batching
         * avoids blocking the thread for long, diluting this cost so that it is not
         * negatively affecting the application. Nonetheless, this method should only
         * be called when necessary, and relying on automatic vacuuming is usually
         * better.
         *
         * It returns a promise that resolves (to undefined) when the clean up is
         * completed. If vacuuming is already ongoing at the time this method is
         * called, a new one is enqueued immediately after the ongoing one, and a
         * corresponding promise is returned. However, no more than one vacuuming is
         * enqueued on top of the ongoing one, even if this method is called more
         * times (enqueuing multiple ones would be useless).
         *
         * @param options  Configuration options for the batch size and delay. See
         * {@link VacuumOptions}.
         */
        MiniSearch.prototype.vacuum = function (options) {
            if (options === void 0) { options = {}; }
            return this.conditionalVacuum(options);
        };
        MiniSearch.prototype.conditionalVacuum = function (options, conditions) {
            var _this = this;
            // If a vacuum is already ongoing, schedule another as soon as it finishes,
            // unless there's already one enqueued. If one was already enqueued, do not
            // enqueue another on top, but make sure that the conditions are the
            // broadest.
            if (this._currentVacuum) {
                this._enqueuedVacuumConditions = this._enqueuedVacuumConditions && conditions;
                if (this._enqueuedVacuum != null) {
                    return this._enqueuedVacuum;
                }
                this._enqueuedVacuum = this._currentVacuum.then(function () {
                    var conditions = _this._enqueuedVacuumConditions;
                    _this._enqueuedVacuumConditions = defaultVacuumConditions;
                    return _this.performVacuuming(options, conditions);
                });
                return this._enqueuedVacuum;
            }
            if (this.vacuumConditionsMet(conditions) === false) {
                return Promise.resolve();
            }
            this._currentVacuum = this.performVacuuming(options);
            return this._currentVacuum;
        };
        MiniSearch.prototype.performVacuuming = function (options, conditions) {
            return __awaiter(this, void 0, void 0, function () {
                var initialDirtCount, batchSize, batchWait_1, i, _a, _b, _c, term, fieldsData, fieldsData_1, fieldsData_1_1, _d, fieldId, fieldIndex, fieldIndex_1, fieldIndex_1_1, _e, shortId, e_10_1;
                var e_10, _f, e_11, _g, e_12, _h;
                return __generator(this, function (_j) {
                    switch (_j.label) {
                        case 0:
                            initialDirtCount = this._dirtCount;
                            if (!this.vacuumConditionsMet(conditions)) return [3 /*break*/, 10];
                            batchSize = options.batchSize || defaultVacuumOptions.batchSize;
                            batchWait_1 = options.batchWait || defaultVacuumOptions.batchWait;
                            i = 1;
                            _j.label = 1;
                        case 1:
                            _j.trys.push([1, 7, 8, 9]);
                            _a = __values(this._index), _b = _a.next();
                            _j.label = 2;
                        case 2:
                            if (!!_b.done) return [3 /*break*/, 6];
                            _c = __read(_b.value, 2), term = _c[0], fieldsData = _c[1];
                            try {
                                for (fieldsData_1 = (e_11 = void 0, __values(fieldsData)), fieldsData_1_1 = fieldsData_1.next(); !fieldsData_1_1.done; fieldsData_1_1 = fieldsData_1.next()) {
                                    _d = __read(fieldsData_1_1.value, 2), fieldId = _d[0], fieldIndex = _d[1];
                                    try {
                                        for (fieldIndex_1 = (e_12 = void 0, __values(fieldIndex)), fieldIndex_1_1 = fieldIndex_1.next(); !fieldIndex_1_1.done; fieldIndex_1_1 = fieldIndex_1.next()) {
                                            _e = __read(fieldIndex_1_1.value, 1), shortId = _e[0];
                                            if (this._documentIds.has(shortId)) {
                                                continue;
                                            }
                                            if (fieldIndex.size <= 1) {
                                                fieldsData.delete(fieldId);
                                            }
                                            else {
                                                fieldIndex.delete(shortId);
                                            }
                                        }
                                    }
                                    catch (e_12_1) { e_12 = { error: e_12_1 }; }
                                    finally {
                                        try {
                                            if (fieldIndex_1_1 && !fieldIndex_1_1.done && (_h = fieldIndex_1.return)) _h.call(fieldIndex_1);
                                        }
                                        finally { if (e_12) throw e_12.error; }
                                    }
                                }
                            }
                            catch (e_11_1) { e_11 = { error: e_11_1 }; }
                            finally {
                                try {
                                    if (fieldsData_1_1 && !fieldsData_1_1.done && (_g = fieldsData_1.return)) _g.call(fieldsData_1);
                                }
                                finally { if (e_11) throw e_11.error; }
                            }
                            if (this._index.get(term).size === 0) {
                                this._index.delete(term);
                            }
                            if (!(i % batchSize === 0)) return [3 /*break*/, 4];
                            return [4 /*yield*/, new Promise(function (resolve) { return setTimeout(resolve, batchWait_1); })];
                        case 3:
                            _j.sent();
                            _j.label = 4;
                        case 4:
                            i += 1;
                            _j.label = 5;
                        case 5:
                            _b = _a.next();
                            return [3 /*break*/, 2];
                        case 6: return [3 /*break*/, 9];
                        case 7:
                            e_10_1 = _j.sent();
                            e_10 = { error: e_10_1 };
                            return [3 /*break*/, 9];
                        case 8:
                            try {
                                if (_b && !_b.done && (_f = _a.return)) _f.call(_a);
                            }
                            finally { if (e_10) throw e_10.error; }
                            return [7 /*endfinally*/];
                        case 9:
                            this._dirtCount -= initialDirtCount;
                            _j.label = 10;
                        case 10: 
                        // Make the next lines always async, so they execute after this function returns
                        return [4 /*yield*/, null];
                        case 11:
                            // Make the next lines always async, so they execute after this function returns
                            _j.sent();
                            this._currentVacuum = this._enqueuedVacuum;
                            this._enqueuedVacuum = null;
                            return [2 /*return*/];
                    }
                });
            });
        };
        MiniSearch.prototype.vacuumConditionsMet = function (conditions) {
            if (conditions == null) {
                return true;
            }
            var minDirtCount = conditions.minDirtCount, minDirtFactor = conditions.minDirtFactor;
            minDirtCount = minDirtCount || defaultAutoVacuumOptions.minDirtCount;
            minDirtFactor = minDirtFactor || defaultAutoVacuumOptions.minDirtFactor;
            return this.dirtCount >= minDirtCount && this.dirtFactor >= minDirtFactor;
        };
        Object.defineProperty(MiniSearch.prototype, "isVacuuming", {
            /**
             * Is `true` if a vacuuming operation is ongoing, `false` otherwise
             */
            get: function () {
                return this._currentVacuum != null;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(MiniSearch.prototype, "dirtCount", {
            /**
             * The number of documents discarded since the most recent vacuuming
             */
            get: function () {
                return this._dirtCount;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(MiniSearch.prototype, "dirtFactor", {
            /**
             * A number between 0 and 1 giving an indication about the proportion of
             * documents that are discarded, and can therefore be cleaned up by vacuuming.
             * A value close to 0 means that the index is relatively clean, while a higher
             * value means that the index is relatively dirty, and vacuuming could release
             * memory.
             */
            get: function () {
                return this._dirtCount / (1 + this._documentCount + this._dirtCount);
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Returns `true` if a document with the given ID is present in the index and
         * available for search, `false` otherwise
         *
         * @param id  The document ID
         */
        MiniSearch.prototype.has = function (id) {
            return this._idToShortId.has(id);
        };
        /**
         * Returns the stored fields (as configured in the `storeFields` constructor
         * option) for the given document ID. Returns `undefined` if the document is
         * not present in the index.
         *
         * @param id  The document ID
         */
        MiniSearch.prototype.getStoredFields = function (id) {
            var shortId = this._idToShortId.get(id);
            if (shortId == null) {
                return undefined;
            }
            return this._storedFields.get(shortId);
        };
        /**
         * Search for documents matching the given search query.
         *
         * The result is a list of scored document IDs matching the query, sorted by
         * descending score, and each including data about which terms were matched and
         * in which fields.
         *
         * ### Basic usage:
         *
         * ```javascript
         * // Search for "zen art motorcycle" with default options: terms have to match
         * // exactly, and individual terms are joined with OR
         * miniSearch.search('zen art motorcycle')
         * // => [ { id: 2, score: 2.77258, match: { ... } }, { id: 4, score: 1.38629, match: { ... } } ]
         * ```
         *
         * ### Restrict search to specific fields:
         *
         * ```javascript
         * // Search only in the 'title' field
         * miniSearch.search('zen', { fields: ['title'] })
         * ```
         *
         * ### Field boosting:
         *
         * ```javascript
         * // Boost a field
         * miniSearch.search('zen', { boost: { title: 2 } })
         * ```
         *
         * ### Prefix search:
         *
         * ```javascript
         * // Search for "moto" with prefix search (it will match documents
         * // containing terms that start with "moto" or "neuro")
         * miniSearch.search('moto neuro', { prefix: true })
         * ```
         *
         * ### Fuzzy search:
         *
         * ```javascript
         * // Search for "ismael" with fuzzy search (it will match documents containing
         * // terms similar to "ismael", with a maximum edit distance of 0.2 term.length
         * // (rounded to nearest integer)
         * miniSearch.search('ismael', { fuzzy: 0.2 })
         * ```
         *
         * ### Combining strategies:
         *
         * ```javascript
         * // Mix of exact match, prefix search, and fuzzy search
         * miniSearch.search('ismael mob', {
         *  prefix: true,
         *  fuzzy: 0.2
         * })
         * ```
         *
         * ### Advanced prefix and fuzzy search:
         *
         * ```javascript
         * // Perform fuzzy and prefix search depending on the search term. Here
         * // performing prefix and fuzzy search only on terms longer than 3 characters
         * miniSearch.search('ismael mob', {
         *  prefix: term => term.length > 3
         *  fuzzy: term => term.length > 3 ? 0.2 : null
         * })
         * ```
         *
         * ### Combine with AND:
         *
         * ```javascript
         * // Combine search terms with AND (to match only documents that contain both
         * // "motorcycle" and "art")
         * miniSearch.search('motorcycle art', { combineWith: 'AND' })
         * ```
         *
         * ### Combine with AND_NOT:
         *
         * There is also an AND_NOT combinator, that finds documents that match the
         * first term, but do not match any of the other terms. This combinator is
         * rarely useful with simple queries, and is meant to be used with advanced
         * query combinations (see later for more details).
         *
         * ### Filtering results:
         *
         * ```javascript
         * // Filter only results in the 'fiction' category (assuming that 'category'
         * // is a stored field)
         * miniSearch.search('motorcycle art', {
         *   filter: (result) => result.category === 'fiction'
         * })
         * ```
         *
         * ### Wildcard query
         *
         * Searching for an empty string (assuming the default tokenizer) returns no
         * results. Sometimes though, one needs to match all documents, like in a
         * "wildcard" search. This is possible by passing the special value
         * {@link MiniSearch.wildcard} as the query:
         *
         * ```javascript
         * // Return search results for all documents
         * miniSearch.search(MiniSearch.wildcard)
         * ```
         *
         * Note that search options such as `filter` and `boostDocument` are still
         * applied, influencing which results are returned, and their order:
         *
         * ```javascript
         * // Return search results for all documents in the 'fiction' category
         * miniSearch.search(MiniSearch.wildcard, {
         *   filter: (result) => result.category === 'fiction'
         * })
         * ```
         *
         * ### Advanced combination of queries:
         *
         * It is possible to combine different subqueries with OR, AND, and AND_NOT,
         * and even with different search options, by passing a query expression
         * tree object as the first argument, instead of a string.
         *
         * ```javascript
         * // Search for documents that contain "zen" and ("motorcycle" or "archery")
         * miniSearch.search({
         *   combineWith: 'AND',
         *   queries: [
         *     'zen',
         *     {
         *       combineWith: 'OR',
         *       queries: ['motorcycle', 'archery']
         *     }
         *   ]
         * })
         *
         * // Search for documents that contain ("apple" or "pear") but not "juice" and
         * // not "tree"
         * miniSearch.search({
         *   combineWith: 'AND_NOT',
         *   queries: [
         *     {
         *       combineWith: 'OR',
         *       queries: ['apple', 'pear']
         *     },
         *     'juice',
         *     'tree'
         *   ]
         * })
         * ```
         *
         * Each node in the expression tree can be either a string, or an object that
         * supports all {@link SearchOptions} fields, plus a `queries` array field for
         * subqueries.
         *
         * Note that, while this can become complicated to do by hand for complex or
         * deeply nested queries, it provides a formalized expression tree API for
         * external libraries that implement a parser for custom query languages.
         *
         * @param query  Search query
         * @param options  Search options. Each option, if not given, defaults to the corresponding value of `searchOptions` given to the constructor, or to the library default.
         */
        MiniSearch.prototype.search = function (query, searchOptions) {
            var e_13, _a;
            if (searchOptions === void 0) { searchOptions = {}; }
            var rawResults = this.executeQuery(query, searchOptions);
            var results = [];
            try {
                for (var rawResults_1 = __values(rawResults), rawResults_1_1 = rawResults_1.next(); !rawResults_1_1.done; rawResults_1_1 = rawResults_1.next()) {
                    var _b = __read(rawResults_1_1.value, 2), docId = _b[0], _c = _b[1], score = _c.score, terms = _c.terms, match = _c.match;
                    // terms are the matched query terms, which will be returned to the user
                    // as queryTerms. The quality is calculated based on them, as opposed to
                    // the matched terms in the document (which can be different due to
                    // prefix and fuzzy match)
                    var quality = terms.length || 1;
                    var result = {
                        id: this._documentIds.get(docId),
                        score: score * quality,
                        terms: Object.keys(match),
                        queryTerms: terms,
                        match: match
                    };
                    Object.assign(result, this._storedFields.get(docId));
                    if (searchOptions.filter == null || searchOptions.filter(result)) {
                        results.push(result);
                    }
                }
            }
            catch (e_13_1) { e_13 = { error: e_13_1 }; }
            finally {
                try {
                    if (rawResults_1_1 && !rawResults_1_1.done && (_a = rawResults_1.return)) _a.call(rawResults_1);
                }
                finally { if (e_13) throw e_13.error; }
            }
            // If it's a wildcard query, and no document boost is applied, skip sorting
            // the results, as all results have the same score of 1
            if (query === MiniSearch.wildcard &&
                searchOptions.boostDocument == null &&
                this._options.searchOptions.boostDocument == null) {
                return results;
            }
            results.sort(byScore);
            return results;
        };
        /**
         * Provide suggestions for the given search query
         *
         * The result is a list of suggested modified search queries, derived from the
         * given search query, each with a relevance score, sorted by descending score.
         *
         * By default, it uses the same options used for search, except that by
         * default it performs prefix search on the last term of the query, and
         * combine terms with `'AND'` (requiring all query terms to match). Custom
         * options can be passed as a second argument. Defaults can be changed upon
         * calling the {@link MiniSearch} constructor, by passing a
         * `autoSuggestOptions` option.
         *
         * ### Basic usage:
         *
         * ```javascript
         * // Get suggestions for 'neuro':
         * miniSearch.autoSuggest('neuro')
         * // => [ { suggestion: 'neuromancer', terms: [ 'neuromancer' ], score: 0.46240 } ]
         * ```
         *
         * ### Multiple words:
         *
         * ```javascript
         * // Get suggestions for 'zen ar':
         * miniSearch.autoSuggest('zen ar')
         * // => [
         * //  { suggestion: 'zen archery art', terms: [ 'zen', 'archery', 'art' ], score: 1.73332 },
         * //  { suggestion: 'zen art', terms: [ 'zen', 'art' ], score: 1.21313 }
         * // ]
         * ```
         *
         * ### Fuzzy suggestions:
         *
         * ```javascript
         * // Correct spelling mistakes using fuzzy search:
         * miniSearch.autoSuggest('neromancer', { fuzzy: 0.2 })
         * // => [ { suggestion: 'neuromancer', terms: [ 'neuromancer' ], score: 1.03998 } ]
         * ```
         *
         * ### Filtering:
         *
         * ```javascript
         * // Get suggestions for 'zen ar', but only within the 'fiction' category
         * // (assuming that 'category' is a stored field):
         * miniSearch.autoSuggest('zen ar', {
         *   filter: (result) => result.category === 'fiction'
         * })
         * // => [
         * //  { suggestion: 'zen archery art', terms: [ 'zen', 'archery', 'art' ], score: 1.73332 },
         * //  { suggestion: 'zen art', terms: [ 'zen', 'art' ], score: 1.21313 }
         * // ]
         * ```
         *
         * @param queryString  Query string to be expanded into suggestions
         * @param options  Search options. The supported options and default values
         * are the same as for the {@link MiniSearch#search} method, except that by
         * default prefix search is performed on the last term in the query, and terms
         * are combined with `'AND'`.
         * @return  A sorted array of suggestions sorted by relevance score.
         */
        MiniSearch.prototype.autoSuggest = function (queryString, options) {
            var e_14, _a, e_15, _b;
            if (options === void 0) { options = {}; }
            options = __assign(__assign({}, this._options.autoSuggestOptions), options);
            var suggestions = new Map();
            try {
                for (var _c = __values(this.search(queryString, options)), _d = _c.next(); !_d.done; _d = _c.next()) {
                    var _e = _d.value, score = _e.score, terms = _e.terms;
                    var phrase = terms.join(' ');
                    var suggestion = suggestions.get(phrase);
                    if (suggestion != null) {
                        suggestion.score += score;
                        suggestion.count += 1;
                    }
                    else {
                        suggestions.set(phrase, { score: score, terms: terms, count: 1 });
                    }
                }
            }
            catch (e_14_1) { e_14 = { error: e_14_1 }; }
            finally {
                try {
                    if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
                }
                finally { if (e_14) throw e_14.error; }
            }
            var results = [];
            try {
                for (var suggestions_1 = __values(suggestions), suggestions_1_1 = suggestions_1.next(); !suggestions_1_1.done; suggestions_1_1 = suggestions_1.next()) {
                    var _f = __read(suggestions_1_1.value, 2), suggestion = _f[0], _g = _f[1], score = _g.score, terms = _g.terms, count = _g.count;
                    results.push({ suggestion: suggestion, terms: terms, score: score / count });
                }
            }
            catch (e_15_1) { e_15 = { error: e_15_1 }; }
            finally {
                try {
                    if (suggestions_1_1 && !suggestions_1_1.done && (_b = suggestions_1.return)) _b.call(suggestions_1);
                }
                finally { if (e_15) throw e_15.error; }
            }
            results.sort(byScore);
            return results;
        };
        Object.defineProperty(MiniSearch.prototype, "documentCount", {
            /**
             * Total number of documents available to search
             */
            get: function () {
                return this._documentCount;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(MiniSearch.prototype, "termCount", {
            /**
             * Number of terms in the index
             */
            get: function () {
                return this._index.size;
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Deserializes a JSON index (serialized with `JSON.stringify(miniSearch)`)
         * and instantiates a MiniSearch instance. It should be given the same options
         * originally used when serializing the index.
         *
         * ### Usage:
         *
         * ```javascript
         * // If the index was serialized with:
         * let miniSearch = new MiniSearch({ fields: ['title', 'text'] })
         * miniSearch.addAll(documents)
         *
         * const json = JSON.stringify(miniSearch)
         * // It can later be deserialized like this:
         * miniSearch = MiniSearch.loadJSON(json, { fields: ['title', 'text'] })
         * ```
         *
         * @param json  JSON-serialized index
         * @param options  configuration options, same as the constructor
         * @return An instance of MiniSearch deserialized from the given JSON.
         */
        MiniSearch.loadJSON = function (json, options) {
            if (options == null) {
                throw new Error('MiniSearch: loadJSON should be given the same options used when serializing the index');
            }
            return this.loadJS(JSON.parse(json), options);
        };
        /**
         * Returns the default value of an option. It will throw an error if no option
         * with the given name exists.
         *
         * @param optionName  Name of the option
         * @return The default value of the given option
         *
         * ### Usage:
         *
         * ```javascript
         * // Get default tokenizer
         * MiniSearch.getDefault('tokenize')
         *
         * // Get default term processor
         * MiniSearch.getDefault('processTerm')
         *
         * // Unknown options will throw an error
         * MiniSearch.getDefault('notExisting')
         * // => throws 'MiniSearch: unknown option "notExisting"'
         * ```
         */
        MiniSearch.getDefault = function (optionName) {
            if (defaultOptions.hasOwnProperty(optionName)) {
                return getOwnProperty(defaultOptions, optionName);
            }
            else {
                throw new Error("MiniSearch: unknown option \"".concat(optionName, "\""));
            }
        };
        /**
         * @ignore
         */
        MiniSearch.loadJS = function (js, options) {
            var e_16, _a, e_17, _b, e_18, _c;
            var index = js.index, documentCount = js.documentCount, nextId = js.nextId, documentIds = js.documentIds, fieldIds = js.fieldIds, fieldLength = js.fieldLength, averageFieldLength = js.averageFieldLength, storedFields = js.storedFields, dirtCount = js.dirtCount, serializationVersion = js.serializationVersion;
            if (serializationVersion !== 1 && serializationVersion !== 2) {
                throw new Error('MiniSearch: cannot deserialize an index created with an incompatible version');
            }
            var miniSearch = new MiniSearch(options);
            miniSearch._documentCount = documentCount;
            miniSearch._nextId = nextId;
            miniSearch._documentIds = objectToNumericMap(documentIds);
            miniSearch._idToShortId = new Map();
            miniSearch._fieldIds = fieldIds;
            miniSearch._fieldLength = objectToNumericMap(fieldLength);
            miniSearch._avgFieldLength = averageFieldLength;
            miniSearch._storedFields = objectToNumericMap(storedFields);
            miniSearch._dirtCount = dirtCount || 0;
            miniSearch._index = new SearchableMap();
            try {
                for (var _d = __values(miniSearch._documentIds), _e = _d.next(); !_e.done; _e = _d.next()) {
                    var _f = __read(_e.value, 2), shortId = _f[0], id = _f[1];
                    miniSearch._idToShortId.set(id, shortId);
                }
            }
            catch (e_16_1) { e_16 = { error: e_16_1 }; }
            finally {
                try {
                    if (_e && !_e.done && (_a = _d.return)) _a.call(_d);
                }
                finally { if (e_16) throw e_16.error; }
            }
            try {
                for (var index_1 = __values(index), index_1_1 = index_1.next(); !index_1_1.done; index_1_1 = index_1.next()) {
                    var _g = __read(index_1_1.value, 2), term = _g[0], data = _g[1];
                    var dataMap = new Map();
                    try {
                        for (var _h = (e_18 = void 0, __values(Object.keys(data))), _j = _h.next(); !_j.done; _j = _h.next()) {
                            var fieldId = _j.value;
                            var indexEntry = data[fieldId];
                            // Version 1 used to nest the index entry inside a field called ds
                            if (serializationVersion === 1) {
                                indexEntry = indexEntry.ds;
                            }
                            dataMap.set(parseInt(fieldId, 10), objectToNumericMap(indexEntry));
                        }
                    }
                    catch (e_18_1) { e_18 = { error: e_18_1 }; }
                    finally {
                        try {
                            if (_j && !_j.done && (_c = _h.return)) _c.call(_h);
                        }
                        finally { if (e_18) throw e_18.error; }
                    }
                    miniSearch._index.set(term, dataMap);
                }
            }
            catch (e_17_1) { e_17 = { error: e_17_1 }; }
            finally {
                try {
                    if (index_1_1 && !index_1_1.done && (_b = index_1.return)) _b.call(index_1);
                }
                finally { if (e_17) throw e_17.error; }
            }
            return miniSearch;
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.executeQuery = function (query, searchOptions) {
            var _this = this;
            if (searchOptions === void 0) { searchOptions = {}; }
            if (query === MiniSearch.wildcard) {
                return this.executeWildcardQuery(searchOptions);
            }
            if (typeof query !== 'string') {
                var options_1 = __assign(__assign(__assign({}, searchOptions), query), { queries: undefined });
                var results_1 = query.queries.map(function (subquery) { return _this.executeQuery(subquery, options_1); });
                return this.combineResults(results_1, options_1.combineWith);
            }
            var _a = this._options, tokenize = _a.tokenize, processTerm = _a.processTerm, globalSearchOptions = _a.searchOptions;
            var options = __assign(__assign({ tokenize: tokenize, processTerm: processTerm }, globalSearchOptions), searchOptions);
            var searchTokenize = options.tokenize, searchProcessTerm = options.processTerm;
            var terms = searchTokenize(query)
                .flatMap(function (term) { return searchProcessTerm(term); })
                .filter(function (term) { return !!term; });
            var queries = terms.map(termToQuerySpec(options));
            var results = queries.map(function (query) { return _this.executeQuerySpec(query, options); });
            return this.combineResults(results, options.combineWith);
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.executeQuerySpec = function (query, searchOptions) {
            var e_19, _a, e_20, _b;
            var options = __assign(__assign({}, this._options.searchOptions), searchOptions);
            var boosts = (options.fields || this._options.fields).reduce(function (boosts, field) {
                var _a;
                return (__assign(__assign({}, boosts), (_a = {}, _a[field] = getOwnProperty(options.boost, field) || 1, _a)));
            }, {});
            var boostDocument = options.boostDocument, weights = options.weights, maxFuzzy = options.maxFuzzy, bm25params = options.bm25;
            var _c = __assign(__assign({}, defaultSearchOptions.weights), weights), fuzzyWeight = _c.fuzzy, prefixWeight = _c.prefix;
            var data = this._index.get(query.term);
            var results = this.termResults(query.term, query.term, 1, data, boosts, boostDocument, bm25params);
            var prefixMatches;
            var fuzzyMatches;
            if (query.prefix) {
                prefixMatches = this._index.atPrefix(query.term);
            }
            if (query.fuzzy) {
                var fuzzy = (query.fuzzy === true) ? 0.2 : query.fuzzy;
                var maxDistance = fuzzy < 1 ? Math.min(maxFuzzy, Math.round(query.term.length * fuzzy)) : fuzzy;
                if (maxDistance)
                    fuzzyMatches = this._index.fuzzyGet(query.term, maxDistance);
            }
            if (prefixMatches) {
                try {
                    for (var prefixMatches_1 = __values(prefixMatches), prefixMatches_1_1 = prefixMatches_1.next(); !prefixMatches_1_1.done; prefixMatches_1_1 = prefixMatches_1.next()) {
                        var _d = __read(prefixMatches_1_1.value, 2), term = _d[0], data_1 = _d[1];
                        var distance = term.length - query.term.length;
                        if (!distance) {
                            continue;
                        } // Skip exact match.
                        // Delete the term from fuzzy results (if present) if it is also a
                        // prefix result. This entry will always be scored as a prefix result.
                        fuzzyMatches === null || fuzzyMatches === void 0 ? void 0 : fuzzyMatches.delete(term);
                        // Weight gradually approaches 0 as distance goes to infinity, with the
                        // weight for the hypothetical distance 0 being equal to prefixWeight.
                        // The rate of change is much lower than that of fuzzy matches to
                        // account for the fact that prefix matches stay more relevant than
                        // fuzzy matches for longer distances.
                        var weight = prefixWeight * term.length / (term.length + 0.3 * distance);
                        this.termResults(query.term, term, weight, data_1, boosts, boostDocument, bm25params, results);
                    }
                }
                catch (e_19_1) { e_19 = { error: e_19_1 }; }
                finally {
                    try {
                        if (prefixMatches_1_1 && !prefixMatches_1_1.done && (_a = prefixMatches_1.return)) _a.call(prefixMatches_1);
                    }
                    finally { if (e_19) throw e_19.error; }
                }
            }
            if (fuzzyMatches) {
                try {
                    for (var _e = __values(fuzzyMatches.keys()), _f = _e.next(); !_f.done; _f = _e.next()) {
                        var term = _f.value;
                        var _g = __read(fuzzyMatches.get(term), 2), data_2 = _g[0], distance = _g[1];
                        if (!distance) {
                            continue;
                        } // Skip exact match.
                        // Weight gradually approaches 0 as distance goes to infinity, with the
                        // weight for the hypothetical distance 0 being equal to fuzzyWeight.
                        var weight = fuzzyWeight * term.length / (term.length + distance);
                        this.termResults(query.term, term, weight, data_2, boosts, boostDocument, bm25params, results);
                    }
                }
                catch (e_20_1) { e_20 = { error: e_20_1 }; }
                finally {
                    try {
                        if (_f && !_f.done && (_b = _e.return)) _b.call(_e);
                    }
                    finally { if (e_20) throw e_20.error; }
                }
            }
            return results;
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.executeWildcardQuery = function (searchOptions) {
            var e_21, _a;
            var results = new Map();
            var options = __assign(__assign({}, this._options.searchOptions), searchOptions);
            try {
                for (var _b = __values(this._documentIds), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var _d = __read(_c.value, 2), shortId = _d[0], id = _d[1];
                    var score = options.boostDocument ? options.boostDocument(id, '', this._storedFields.get(shortId)) : 1;
                    results.set(shortId, {
                        score: score,
                        terms: [],
                        match: {}
                    });
                }
            }
            catch (e_21_1) { e_21 = { error: e_21_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_21) throw e_21.error; }
            }
            return results;
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.combineResults = function (results, combineWith) {
            if (combineWith === void 0) { combineWith = OR; }
            if (results.length === 0) {
                return new Map();
            }
            var operator = combineWith.toLowerCase();
            return results.reduce(combinators[operator]) || new Map();
        };
        /**
         * Allows serialization of the index to JSON, to possibly store it and later
         * deserialize it with {@link MiniSearch.loadJSON}.
         *
         * Normally one does not directly call this method, but rather call the
         * standard JavaScript `JSON.stringify()` passing the {@link MiniSearch}
         * instance, and JavaScript will internally call this method. Upon
         * deserialization, one must pass to {@link MiniSearch.loadJSON} the same
         * options used to create the original instance that was serialized.
         *
         * ### Usage:
         *
         * ```javascript
         * // Serialize the index:
         * let miniSearch = new MiniSearch({ fields: ['title', 'text'] })
         * miniSearch.addAll(documents)
         * const json = JSON.stringify(miniSearch)
         *
         * // Later, to deserialize it:
         * miniSearch = MiniSearch.loadJSON(json, { fields: ['title', 'text'] })
         * ```
         *
         * @return A plain-object serializable representation of the search index.
         */
        MiniSearch.prototype.toJSON = function () {
            var e_22, _a, e_23, _b;
            var index = [];
            try {
                for (var _c = __values(this._index), _d = _c.next(); !_d.done; _d = _c.next()) {
                    var _e = __read(_d.value, 2), term = _e[0], fieldIndex = _e[1];
                    var data = {};
                    try {
                        for (var fieldIndex_2 = (e_23 = void 0, __values(fieldIndex)), fieldIndex_2_1 = fieldIndex_2.next(); !fieldIndex_2_1.done; fieldIndex_2_1 = fieldIndex_2.next()) {
                            var _f = __read(fieldIndex_2_1.value, 2), fieldId = _f[0], freqs = _f[1];
                            data[fieldId] = Object.fromEntries(freqs);
                        }
                    }
                    catch (e_23_1) { e_23 = { error: e_23_1 }; }
                    finally {
                        try {
                            if (fieldIndex_2_1 && !fieldIndex_2_1.done && (_b = fieldIndex_2.return)) _b.call(fieldIndex_2);
                        }
                        finally { if (e_23) throw e_23.error; }
                    }
                    index.push([term, data]);
                }
            }
            catch (e_22_1) { e_22 = { error: e_22_1 }; }
            finally {
                try {
                    if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
                }
                finally { if (e_22) throw e_22.error; }
            }
            return {
                documentCount: this._documentCount,
                nextId: this._nextId,
                documentIds: Object.fromEntries(this._documentIds),
                fieldIds: this._fieldIds,
                fieldLength: Object.fromEntries(this._fieldLength),
                averageFieldLength: this._avgFieldLength,
                storedFields: Object.fromEntries(this._storedFields),
                dirtCount: this._dirtCount,
                index: index,
                serializationVersion: 2
            };
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.termResults = function (sourceTerm, derivedTerm, termWeight, fieldTermData, fieldBoosts, boostDocumentFn, bm25params, results) {
            var e_24, _a, e_25, _b, _c;
            if (results === void 0) { results = new Map(); }
            if (fieldTermData == null)
                return results;
            try {
                for (var _d = __values(Object.keys(fieldBoosts)), _e = _d.next(); !_e.done; _e = _d.next()) {
                    var field = _e.value;
                    var fieldBoost = fieldBoosts[field];
                    var fieldId = this._fieldIds[field];
                    var fieldTermFreqs = fieldTermData.get(fieldId);
                    if (fieldTermFreqs == null)
                        continue;
                    var matchingFields = fieldTermFreqs.size;
                    var avgFieldLength = this._avgFieldLength[fieldId];
                    try {
                        for (var _f = (e_25 = void 0, __values(fieldTermFreqs.keys())), _g = _f.next(); !_g.done; _g = _f.next()) {
                            var docId = _g.value;
                            if (!this._documentIds.has(docId)) {
                                this.removeTerm(fieldId, docId, derivedTerm);
                                matchingFields -= 1;
                                continue;
                            }
                            var docBoost = boostDocumentFn ? boostDocumentFn(this._documentIds.get(docId), derivedTerm, this._storedFields.get(docId)) : 1;
                            if (!docBoost)
                                continue;
                            var termFreq = fieldTermFreqs.get(docId);
                            var fieldLength = this._fieldLength.get(docId)[fieldId];
                            // NOTE: The total number of fields is set to the number of documents
                            // `this._documentCount`. It could also make sense to use the number of
                            // documents where the current field is non-blank as a normalization
                            // factor. This will make a difference in scoring if the field is rarely
                            // present. This is currently not supported, and may require further
                            // analysis to see if it is a valid use case.
                            var rawScore = calcBM25Score(termFreq, matchingFields, this._documentCount, fieldLength, avgFieldLength, bm25params);
                            var weightedScore = termWeight * fieldBoost * docBoost * rawScore;
                            var result = results.get(docId);
                            if (result) {
                                result.score += weightedScore;
                                assignUniqueTerm(result.terms, sourceTerm);
                                var match = getOwnProperty(result.match, derivedTerm);
                                if (match) {
                                    match.push(field);
                                }
                                else {
                                    result.match[derivedTerm] = [field];
                                }
                            }
                            else {
                                results.set(docId, {
                                    score: weightedScore,
                                    terms: [sourceTerm],
                                    match: (_c = {}, _c[derivedTerm] = [field], _c)
                                });
                            }
                        }
                    }
                    catch (e_25_1) { e_25 = { error: e_25_1 }; }
                    finally {
                        try {
                            if (_g && !_g.done && (_b = _f.return)) _b.call(_f);
                        }
                        finally { if (e_25) throw e_25.error; }
                    }
                }
            }
            catch (e_24_1) { e_24 = { error: e_24_1 }; }
            finally {
                try {
                    if (_e && !_e.done && (_a = _d.return)) _a.call(_d);
                }
                finally { if (e_24) throw e_24.error; }
            }
            return results;
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.addTerm = function (fieldId, documentId, term) {
            var indexData = this._index.fetch(term, createMap);
            var fieldIndex = indexData.get(fieldId);
            if (fieldIndex == null) {
                fieldIndex = new Map();
                fieldIndex.set(documentId, 1);
                indexData.set(fieldId, fieldIndex);
            }
            else {
                var docs = fieldIndex.get(documentId);
                fieldIndex.set(documentId, (docs || 0) + 1);
            }
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.removeTerm = function (fieldId, documentId, term) {
            if (!this._index.has(term)) {
                this.warnDocumentChanged(documentId, fieldId, term);
                return;
            }
            var indexData = this._index.fetch(term, createMap);
            var fieldIndex = indexData.get(fieldId);
            if (fieldIndex == null || fieldIndex.get(documentId) == null) {
                this.warnDocumentChanged(documentId, fieldId, term);
            }
            else if (fieldIndex.get(documentId) <= 1) {
                if (fieldIndex.size <= 1) {
                    indexData.delete(fieldId);
                }
                else {
                    fieldIndex.delete(documentId);
                }
            }
            else {
                fieldIndex.set(documentId, fieldIndex.get(documentId) - 1);
            }
            if (this._index.get(term).size === 0) {
                this._index.delete(term);
            }
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.warnDocumentChanged = function (shortDocumentId, fieldId, term) {
            var e_26, _a;
            try {
                for (var _b = __values(Object.keys(this._fieldIds)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var fieldName = _c.value;
                    if (this._fieldIds[fieldName] === fieldId) {
                        this._options.logger('warn', "MiniSearch: document with ID ".concat(this._documentIds.get(shortDocumentId), " has changed before removal: term \"").concat(term, "\" was not present in field \"").concat(fieldName, "\". Removing a document after it has changed can corrupt the index!"), 'version_conflict');
                        return;
                    }
                }
            }
            catch (e_26_1) { e_26 = { error: e_26_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_26) throw e_26.error; }
            }
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.addDocumentId = function (documentId) {
            var shortDocumentId = this._nextId;
            this._idToShortId.set(documentId, shortDocumentId);
            this._documentIds.set(shortDocumentId, documentId);
            this._documentCount += 1;
            this._nextId += 1;
            return shortDocumentId;
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.addFields = function (fields) {
            for (var i = 0; i < fields.length; i++) {
                this._fieldIds[fields[i]] = i;
            }
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.addFieldLength = function (documentId, fieldId, count, length) {
            var fieldLengths = this._fieldLength.get(documentId);
            if (fieldLengths == null)
                this._fieldLength.set(documentId, fieldLengths = []);
            fieldLengths[fieldId] = length;
            var averageFieldLength = this._avgFieldLength[fieldId] || 0;
            var totalFieldLength = (averageFieldLength * count) + length;
            this._avgFieldLength[fieldId] = totalFieldLength / (count + 1);
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.removeFieldLength = function (documentId, fieldId, count, length) {
            if (count === 1) {
                this._avgFieldLength[fieldId] = 0;
                return;
            }
            var totalFieldLength = (this._avgFieldLength[fieldId] * count) - length;
            this._avgFieldLength[fieldId] = totalFieldLength / (count - 1);
        };
        /**
         * @ignore
         */
        MiniSearch.prototype.saveStoredFields = function (documentId, doc) {
            var e_27, _a;
            var _b = this._options, storeFields = _b.storeFields, extractField = _b.extractField;
            if (storeFields == null || storeFields.length === 0) {
                return;
            }
            var documentFields = this._storedFields.get(documentId);
            if (documentFields == null)
                this._storedFields.set(documentId, documentFields = {});
            try {
                for (var storeFields_1 = __values(storeFields), storeFields_1_1 = storeFields_1.next(); !storeFields_1_1.done; storeFields_1_1 = storeFields_1.next()) {
                    var fieldName = storeFields_1_1.value;
                    var fieldValue = extractField(doc, fieldName);
                    if (fieldValue !== undefined)
                        documentFields[fieldName] = fieldValue;
                }
            }
            catch (e_27_1) { e_27 = { error: e_27_1 }; }
            finally {
                try {
                    if (storeFields_1_1 && !storeFields_1_1.done && (_a = storeFields_1.return)) _a.call(storeFields_1);
                }
                finally { if (e_27) throw e_27.error; }
            }
        };
        /**
         * The special wildcard symbol that can be passed to {@link MiniSearch#search}
         * to match all documents
         */
        MiniSearch.wildcard = Symbol('*');
        return MiniSearch;
    }());
    var getOwnProperty = function (object, property) {
        return Object.prototype.hasOwnProperty.call(object, property) ? object[property] : undefined;
    };
    var combinators = (_a = {},
        _a[OR] = function (a, b) {
            var e_28, _a;
            try {
                for (var _b = __values(b.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var docId = _c.value;
                    var existing = a.get(docId);
                    if (existing == null) {
                        a.set(docId, b.get(docId));
                    }
                    else {
                        var _d = b.get(docId), score = _d.score, terms = _d.terms, match = _d.match;
                        existing.score = existing.score + score;
                        existing.match = Object.assign(existing.match, match);
                        assignUniqueTerms(existing.terms, terms);
                    }
                }
            }
            catch (e_28_1) { e_28 = { error: e_28_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_28) throw e_28.error; }
            }
            return a;
        },
        _a[AND] = function (a, b) {
            var e_29, _a;
            var combined = new Map();
            try {
                for (var _b = __values(b.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var docId = _c.value;
                    var existing = a.get(docId);
                    if (existing == null)
                        continue;
                    var _d = b.get(docId), score = _d.score, terms = _d.terms, match = _d.match;
                    assignUniqueTerms(existing.terms, terms);
                    combined.set(docId, {
                        score: existing.score + score,
                        terms: existing.terms,
                        match: Object.assign(existing.match, match)
                    });
                }
            }
            catch (e_29_1) { e_29 = { error: e_29_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_29) throw e_29.error; }
            }
            return combined;
        },
        _a[AND_NOT] = function (a, b) {
            var e_30, _a;
            try {
                for (var _b = __values(b.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var docId = _c.value;
                    a.delete(docId);
                }
            }
            catch (e_30_1) { e_30 = { error: e_30_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_30) throw e_30.error; }
            }
            return a;
        },
        _a);
    var defaultBM25params = { k: 1.2, b: 0.7, d: 0.5 };
    var calcBM25Score = function (termFreq, matchingCount, totalCount, fieldLength, avgFieldLength, bm25params) {
        var k = bm25params.k, b = bm25params.b, d = bm25params.d;
        var invDocFreq = Math.log(1 + (totalCount - matchingCount + 0.5) / (matchingCount + 0.5));
        return invDocFreq * (d + termFreq * (k + 1) / (termFreq + k * (1 - b + b * fieldLength / avgFieldLength)));
    };
    var termToQuerySpec = function (options) { return function (term, i, terms) {
        var fuzzy = (typeof options.fuzzy === 'function')
            ? options.fuzzy(term, i, terms)
            : (options.fuzzy || false);
        var prefix = (typeof options.prefix === 'function')
            ? options.prefix(term, i, terms)
            : (options.prefix === true);
        return { term: term, fuzzy: fuzzy, prefix: prefix };
    }; };
    var defaultOptions = {
        idField: 'id',
        extractField: function (document, fieldName) { return document[fieldName]; },
        tokenize: function (text) { return text.split(SPACE_OR_PUNCTUATION); },
        processTerm: function (term) { return term.toLowerCase(); },
        fields: undefined,
        searchOptions: undefined,
        storeFields: [],
        logger: function (level, message) {
            if (typeof (console === null || console === void 0 ? void 0 : console[level]) === 'function')
                console[level](message);
        },
        autoVacuum: true
    };
    var defaultSearchOptions = {
        combineWith: OR,
        prefix: false,
        fuzzy: false,
        maxFuzzy: 6,
        boost: {},
        weights: { fuzzy: 0.45, prefix: 0.375 },
        bm25: defaultBM25params
    };
    var defaultAutoSuggestOptions = {
        combineWith: AND,
        prefix: function (term, i, terms) {
            return i === terms.length - 1;
        }
    };
    var defaultVacuumOptions = { batchSize: 1000, batchWait: 10 };
    var defaultVacuumConditions = { minDirtFactor: 0.1, minDirtCount: 20 };
    var defaultAutoVacuumOptions = __assign(__assign({}, defaultVacuumOptions), defaultVacuumConditions);
    var assignUniqueTerm = function (target, term) {
        // Avoid adding duplicate terms.
        if (!target.includes(term))
            target.push(term);
    };
    var assignUniqueTerms = function (target, source) {
        var e_31, _a;
        try {
            for (var source_1 = __values(source), source_1_1 = source_1.next(); !source_1_1.done; source_1_1 = source_1.next()) {
                var term = source_1_1.value;
                // Avoid adding duplicate terms.
                if (!target.includes(term))
                    target.push(term);
            }
        }
        catch (e_31_1) { e_31 = { error: e_31_1 }; }
        finally {
            try {
                if (source_1_1 && !source_1_1.done && (_a = source_1.return)) _a.call(source_1);
            }
            finally { if (e_31) throw e_31.error; }
        }
    };
    var byScore = function (_a, _b) {
        var a = _a.score;
        var b = _b.score;
        return b - a;
    };
    var createMap = function () { return new Map(); };
    var objectToNumericMap = function (object) {
        var e_32, _a;
        var map = new Map();
        try {
            for (var _b = __values(Object.keys(object)), _c = _b.next(); !_c.done; _c = _b.next()) {
                var key = _c.value;
                map.set(parseInt(key, 10), object[key]);
            }
        }
        catch (e_32_1) { e_32 = { error: e_32_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_32) throw e_32.error; }
        }
        return map;
    };
    // This regular expression matches any Unicode space or punctuation character
    // Adapted from https://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5Cp%7BZ%7D%5Cp%7BP%7D&abb=on&c=on&esc=on
    var SPACE_OR_PUNCTUATION = /[\n\r -#%-*,-/:;?@[-\]_{}\u00A0\u00A1\u00A7\u00AB\u00B6\u00B7\u00BB\u00BF\u037E\u0387\u055A-\u055F\u0589\u058A\u05BE\u05C0\u05C3\u05C6\u05F3\u05F4\u0609\u060A\u060C\u060D\u061B\u061E\u061F\u066A-\u066D\u06D4\u0700-\u070D\u07F7-\u07F9\u0830-\u083E\u085E\u0964\u0965\u0970\u09FD\u0A76\u0AF0\u0C77\u0C84\u0DF4\u0E4F\u0E5A\u0E5B\u0F04-\u0F12\u0F14\u0F3A-\u0F3D\u0F85\u0FD0-\u0FD4\u0FD9\u0FDA\u104A-\u104F\u10FB\u1360-\u1368\u1400\u166E\u1680\u169B\u169C\u16EB-\u16ED\u1735\u1736\u17D4-\u17D6\u17D8-\u17DA\u1800-\u180A\u1944\u1945\u1A1E\u1A1F\u1AA0-\u1AA6\u1AA8-\u1AAD\u1B5A-\u1B60\u1BFC-\u1BFF\u1C3B-\u1C3F\u1C7E\u1C7F\u1CC0-\u1CC7\u1CD3\u2000-\u200A\u2010-\u2029\u202F-\u2043\u2045-\u2051\u2053-\u205F\u207D\u207E\u208D\u208E\u2308-\u230B\u2329\u232A\u2768-\u2775\u27C5\u27C6\u27E6-\u27EF\u2983-\u2998\u29D8-\u29DB\u29FC\u29FD\u2CF9-\u2CFC\u2CFE\u2CFF\u2D70\u2E00-\u2E2E\u2E30-\u2E4F\u3000-\u3003\u3008-\u3011\u3014-\u301F\u3030\u303D\u30A0\u30FB\uA4FE\uA4FF\uA60D-\uA60F\uA673\uA67E\uA6F2-\uA6F7\uA874-\uA877\uA8CE\uA8CF\uA8F8-\uA8FA\uA8FC\uA92E\uA92F\uA95F\uA9C1-\uA9CD\uA9DE\uA9DF\uAA5C-\uAA5F\uAADE\uAADF\uAAF0\uAAF1\uABEB\uFD3E\uFD3F\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE61\uFE63\uFE68\uFE6A\uFE6B\uFF01-\uFF03\uFF05-\uFF0A\uFF0C-\uFF0F\uFF1A\uFF1B\uFF1F\uFF20\uFF3B-\uFF3D\uFF3F\uFF5B\uFF5D\uFF5F-\uFF65]+/u;

    return MiniSearch;

}));
//# sourceMappingURL=index.js.map
