fuse.js/dist/fuse.mjs

Lightweight fuzzy-search

/**
 * Fuse.js v7.3.0 - Lightweight fuzzy-search (http://fusejs.io)
 *
 * Copyright (c) 2026 Kiro Risk (http://kiro.me)
 * All Rights Reserved. Apache Software License 2.0
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 */

function isArray(value) {
  return !Array.isArray ? getTag(value) === '[object Array]' : Array.isArray(value);
}
function baseToString(value) {
  // Exit early for strings to avoid a performance hit in some environments.
  if (typeof value == 'string') {
    return value;
  }
  if (typeof value === 'bigint') {
    return value.toString();
  }
  const result = value + '';
  return result == '0' && 1 / value == -Infinity ? '-0' : result;
}
function toString(value) {
  return value == null ? '' : baseToString(value);
}
function isString(value) {
  return typeof value === 'string';
}
function isNumber(value) {
  return typeof value === 'number';
}

// Adapted from: https://github.com/lodash/lodash/blob/master/isBoolean.js
function isBoolean(value) {
  return value === true || value === false || isObjectLike(value) && getTag(value) == '[object Boolean]';
}
function isObject(value) {
  return typeof value === 'object';
}

// Checks if `value` is object-like.
function isObjectLike(value) {
  return isObject(value) && value !== null;
}
function isDefined(value) {
  return value !== undefined && value !== null;
}
function isBlank(value) {
  return !value.trim().length;
}

// Gets the `toStringTag` of `value`.
// Adapted from: https://github.com/lodash/lodash/blob/master/.internal/getTag.js
function getTag(value) {
  return value == null ? value === undefined ? '[object Undefined]' : '[object Null]' : Object.prototype.toString.call(value);
}

const INCORRECT_INDEX_TYPE = "Incorrect 'index' type";
const LOGICAL_SEARCH_INVALID_QUERY_FOR_KEY = key => `Invalid value for key ${key}`;
const PATTERN_LENGTH_TOO_LARGE = max => `Pattern length exceeds max of ${max}.`;
const MISSING_KEY_PROPERTY = name => `Missing ${name} property in key`;
const INVALID_KEY_WEIGHT_VALUE = key => `Property 'weight' in key '${key}' must be a positive integer`;

const hasOwn = Object.prototype.hasOwnProperty;
class KeyStore {
  constructor(keys) {
    this._keys = [];
    this._keyMap = {};
    let totalWeight = 0;
    keys.forEach(key => {
      const obj = createKey(key);
      this._keys.push(obj);
      this._keyMap[obj.id] = obj;
      totalWeight += obj.weight;
    });

    // Normalize weights so that their sum is equal to 1
    this._keys.forEach(key => {
      key.weight /= totalWeight;
    });
  }
  get(keyId) {
    return this._keyMap[keyId];
  }
  keys() {
    return this._keys;
  }
  toJSON() {
    return JSON.stringify(this._keys);
  }
}
function createKey(key) {
  let path = null;
  let id = null;
  let src = null;
  let weight = 1;
  let getFn = null;
  if (isString(key) || isArray(key)) {
    src = key;
    path = createKeyPath(key);
    id = createKeyId(key);
  } else {
    if (!hasOwn.call(key, 'name')) {
      throw new Error(MISSING_KEY_PROPERTY('name'));
    }
    const name = key.name;
    src = name;
    if (hasOwn.call(key, 'weight')) {
      weight = key.weight;
      if (weight <= 0) {
        throw new Error(INVALID_KEY_WEIGHT_VALUE(name));
      }
    }
    path = createKeyPath(name);
    id = createKeyId(name);
    getFn = key.getFn;
  }
  return {
    path: path,
    id: id,
    weight,
    src: src,
    getFn
  };
}
function createKeyPath(key) {
  return isArray(key) ? key : key.split('.');
}
function createKeyId(key) {
  return isArray(key) ? key.join('.') : key;
}

function get(obj, path) {
  const list = [];
  let arr = false;
  const deepGet = (obj, path, index, arrayIndex) => {
    if (!isDefined(obj)) {
      return;
    }
    if (!path[index]) {
      // If there's no path left, we've arrived at the object we care about.
      list.push(arrayIndex !== undefined ? {
        v: obj,
        i: arrayIndex
      } : obj);
    } else {
      const key = path[index];
      const value = obj[key];
      if (!isDefined(value)) {
        return;
      }

      // If we're at the last value in the path, and if it's a string/number/bool,
      // add it to the list
      if (index === path.length - 1 && (isString(value) || isNumber(value) || isBoolean(value) || typeof value === 'bigint')) {
        list.push(arrayIndex !== undefined ? {
          v: toString(value),
          i: arrayIndex
        } : toString(value));
      } else if (isArray(value)) {
        arr = true;
        // Search each item in the array.
        for (let i = 0, len = value.length; i < len; i += 1) {
          deepGet(value[i], path, index + 1, i);
        }
      } else if (path.length) {
        // An object. Recurse further.
        deepGet(value, path, index + 1, arrayIndex);
      }
    }
  };

  // Backwards compatibility (since path used to be a string)
  deepGet(obj, isString(path) ? path.split('.') : path, 0);
  return arr ? list : list[0];
}

const MatchOptions = {
  includeMatches: false,
  findAllMatches: false,
  minMatchCharLength: 1
};
const BasicOptions = {
  isCaseSensitive: false,
  ignoreDiacritics: false,
  includeScore: false,
  keys: [],
  shouldSort: true,
  sortFn: (a, b) => a.score === b.score ? a.idx < b.idx ? -1 : 1 : a.score < b.score ? -1 : 1
};
const FuzzyOptions = {
  location: 0,
  threshold: 0.6,
  distance: 100
};
const AdvancedOptions = {
  useExtendedSearch: false,
  useTokenSearch: false,
  getFn: get,
  ignoreLocation: false,
  ignoreFieldNorm: false,
  fieldNormWeight: 1
};
const Config = Object.freeze({
  ...BasicOptions,
  ...MatchOptions,
  ...FuzzyOptions,
  ...AdvancedOptions
});

const SPACE = /[^ ]+/g;

// Field-length norm: the shorter the field, the higher the weight.
// Set to 3 decimals to reduce index size.
function norm(weight = 1, mantissa = 3) {
  const cache = new Map();
  const m = Math.pow(10, mantissa);
  return {
    get(value) {
      const numTokens = value.match(SPACE).length;
      if (cache.has(numTokens)) {
        return cache.get(numTokens);
      }

      // Default function is 1/sqrt(x), weight makes that variable
      const norm = 1 / Math.pow(numTokens, 0.5 * weight);

      // In place of `toFixed(mantissa)`, for faster computation
      const n = parseFloat(Math.round(norm * m) / m);
      cache.set(numTokens, n);
      return n;
    },
    clear() {
      cache.clear();
    }
  };
}

class FuseIndex {
  constructor({
    getFn = Config.getFn,
    fieldNormWeight = Config.fieldNormWeight
  } = {}) {
    this.norm = norm(fieldNormWeight, 3);
    this.getFn = getFn;
    this.isCreated = false;
    this.docs = [];
    this.keys = [];
    this._keysMap = {};
    this.setIndexRecords();
  }
  setSources(docs = []) {
    this.docs = docs;
  }
  setIndexRecords(records = []) {
    this.records = records;
  }
  setKeys(keys = []) {
    this.keys = keys;
    this._keysMap = {};
    keys.forEach((key, idx) => {
      this._keysMap[key.id] = idx;
    });
  }
  create() {
    if (this.isCreated || !this.docs.length) {
      return;
    }
    this.isCreated = true;

    // List is Array<String>
    if (isString(this.docs[0])) {
      this.docs.forEach((doc, docIndex) => {
        this._addString(doc, docIndex);
      });
    } else {
      // List is Array<Object>
      this.docs.forEach((doc, docIndex) => {
        this._addObject(doc, docIndex);
      });
    }
    this.norm.clear();
  }
  // Adds a doc to the end of the index
  add(doc) {
    const idx = this.size();
    if (isString(doc)) {
      this._addString(doc, idx);
    } else {
      this._addObject(doc, idx);
    }
  }
  // Removes the doc at the specified index of the index
  removeAt(idx) {
    this.records.splice(idx, 1);

    // Change ref index of every subsquent doc
    for (let i = idx, len = this.size(); i < len; i += 1) {
      this.records[i].i -= 1;
    }
  }
  // Removes docs at the specified indices (must be sorted ascending)
  removeAll(indices) {
    // Remove in reverse order to avoid index shifting during splice
    for (let i = indices.length - 1; i >= 0; i -= 1) {
      this.records.splice(indices[i], 1);
    }
    // Single re-index pass
    for (let i = 0, len = this.records.length; i < len; i += 1) {
      this.records[i].i = i;
    }
  }
  getValueForItemAtKeyId(item, keyId) {
    return item[this._keysMap[keyId]];
  }
  size() {
    return this.records.length;
  }
  _addString(doc, docIndex) {
    if (!isDefined(doc) || isBlank(doc)) {
      return;
    }
    const record = {
      v: doc,
      i: docIndex,
      n: this.norm.get(doc)
    };
    this.records.push(record);
  }
  _addObject(doc, docIndex) {
    const record = {
      i: docIndex,
      $: {}
    };

    // Iterate over every key (i.e, path), and fetch the value at that key
    this.keys.forEach((key, keyIndex) => {
      const value = key.getFn ? key.getFn(doc) : this.getFn(doc, key.path);
      if (!isDefined(value)) {
        return;
      }
      if (isArray(value)) {
        const subRecords = [];
        for (let i = 0, len = value.length; i < len; i += 1) {
          const item = value[i];
          if (!isDefined(item)) {
            continue;
          }
          if (isString(item)) {
            // Custom getFn returning plain string array (backward compat)
            if (!isBlank(item)) {
              const subRecord = {
                v: item,
                i: i,
                n: this.norm.get(item)
              };
              subRecords.push(subRecord);
            }
          } else if (isDefined(item.v)) {
            // Default get() returns {v, i} objects with original array indices
            const text = isString(item.v) ? item.v : toString(item.v);
            if (!isBlank(text)) {
              const subRecord = {
                v: text,
                i: item.i,
                n: this.norm.get(text)
              };
              subRecords.push(subRecord);
            }
          }
        }
        record.$[keyIndex] = subRecords;
      } else if (isString(value) && !isBlank(value)) {
        const subRecord = {
          v: value,
          n: this.norm.get(value)
        };
        record.$[keyIndex] = subRecord;
      }
    });
    this.records.push(record);
  }
  toJSON() {
    return {
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      keys: this.keys.map(({
        getFn,
        ...key
      }) => key),
      records: this.records
    };
  }
}
function createIndex(keys, docs, {
  getFn = Config.getFn,
  fieldNormWeight = Config.fieldNormWeight
} = {}) {
  const myIndex = new FuseIndex({
    getFn,
    fieldNormWeight
  });
  myIndex.setKeys(keys.map(createKey));
  myIndex.setSources(docs);
  myIndex.create();
  return myIndex;
}
function parseIndex(data, {
  getFn = Config.getFn,
  fieldNormWeight = Config.fieldNormWeight
} = {}) {
  const {
    keys,
    records
  } = data;
  const myIndex = new FuseIndex({
    getFn,
    fieldNormWeight
  });
  myIndex.setKeys(keys);
  myIndex.setIndexRecords(records);
  return myIndex;
}

function convertMaskToIndices(matchmask = [], minMatchCharLength = Config.minMatchCharLength) {
  const indices = [];
  let start = -1;
  let end = -1;
  let i = 0;
  for (let len = matchmask.length; i < len; i += 1) {
    const match = matchmask[i];
    if (match && start === -1) {
      start = i;
    } else if (!match && start !== -1) {
      end = i - 1;
      if (end - start + 1 >= minMatchCharLength) {
        indices.push([start, end]);
      }
      start = -1;
    }
  }

  // (i-1 - start) + 1 => i - start
  if (matchmask[i - 1] && i - start >= minMatchCharLength) {
    indices.push([start, i - 1]);
  }
  return indices;
}

// Machine word size
const MAX_BITS = 32;

function search(text, pattern, patternAlphabet, {
  location = Config.location,
  distance = Config.distance,
  threshold = Config.threshold,
  findAllMatches = Config.findAllMatches,
  minMatchCharLength = Config.minMatchCharLength,
  includeMatches = Config.includeMatches,
  ignoreLocation = Config.ignoreLocation
} = {}) {
  if (pattern.length > MAX_BITS) {
    throw new Error(PATTERN_LENGTH_TOO_LARGE(MAX_BITS));
  }
  const patternLen = pattern.length;
  // Set starting location at beginning text and initialize the alphabet.
  const textLen = text.length;
  // Handle the case when location > text.length
  const expectedLocation = Math.max(0, Math.min(location, textLen));
  // Highest score beyond which we give up.
  let currentThreshold = threshold;
  // Is there a nearby exact match? (speedup)
  let bestLocation = expectedLocation;

  // Inlined score computation — avoids object allocation per call in hot loops.
  // See ./computeScore.ts for the documented version of this formula.
  const calcScore = (errors, currentLocation) => {
    const accuracy = errors / patternLen;
    if (ignoreLocation) return accuracy;
    const proximity = Math.abs(expectedLocation - currentLocation);
    if (!distance) return proximity ? 1.0 : accuracy;
    return accuracy + proximity / distance;
  };

  // Performance: only computer matches when the minMatchCharLength > 1
  // OR if `includeMatches` is true.
  const computeMatches = minMatchCharLength > 1 || includeMatches;
  // A mask of the matches, used for building the indices
  const matchMask = computeMatches ? Array(textLen) : [];
  let index;

  // Get all exact matches, here for speed up
  while ((index = text.indexOf(pattern, bestLocation)) > -1) {
    const score = calcScore(0, index);
    currentThreshold = Math.min(score, currentThreshold);
    bestLocation = index + patternLen;
    if (computeMatches) {
      let i = 0;
      while (i < patternLen) {
        matchMask[index + i] = 1;
        i += 1;
      }
    }
  }

  // Reset the best location
  bestLocation = -1;
  let lastBitArr = [];
  let finalScore = 1;
  let binMax = patternLen + textLen;
  const mask = 1 << patternLen - 1;
  for (let i = 0; i < patternLen; i += 1) {
    // Scan for the best match; each iteration allows for one more error.
    // Run a binary search to determine how far from the match location we can stray
    // at this error level.
    let binMin = 0;
    let binMid = binMax;
    while (binMin < binMid) {
      const score = calcScore(i, expectedLocation + binMid);
      if (score <= currentThreshold) {
        binMin = binMid;
      } else {
        binMax = binMid;
      }
      binMid = Math.floor((binMax - binMin) / 2 + binMin);
    }

    // Use the result from this iteration as the maximum for the next.
    binMax = binMid;
    let start = Math.max(1, expectedLocation - binMid + 1);
    const finish = findAllMatches ? textLen : Math.min(expectedLocation + binMid, textLen) + patternLen;

    // Initialize the bit array
    const bitArr = Array(finish + 2);
    bitArr[finish + 1] = (1 << i) - 1;
    for (let j = finish; j >= start; j -= 1) {
      const currentLocation = j - 1;
      const charMatch = patternAlphabet[text[currentLocation]];
      if (computeMatches) {
        // Speed up: quick bool to int conversion (i.e, `charMatch ? 1 : 0`)
        matchMask[currentLocation] = +!!charMatch;
      }

      // First pass: exact match
      bitArr[j] = (bitArr[j + 1] << 1 | 1) & charMatch;

      // Subsequent passes: fuzzy match
      if (i) {
        bitArr[j] |= (lastBitArr[j + 1] | lastBitArr[j]) << 1 | 1 | lastBitArr[j + 1];
      }
      if (bitArr[j] & mask) {
        finalScore = calcScore(i, currentLocation);

        // This match will almost certainly be better than any existing match.
        // But check anyway.
        if (finalScore <= currentThreshold) {
          // Indeed it is
          currentThreshold = finalScore;
          bestLocation = currentLocation;

          // Already passed `loc`, downhill from here on in.
          if (bestLocation <= expectedLocation) {
            break;
          }

          // When passing `bestLocation`, don't exceed our current distance from `expectedLocation`.
          start = Math.max(1, 2 * expectedLocation - bestLocation);
        }
      }
    }

    // No hope for a (better) match at greater error levels.
    const score = calcScore(i + 1, expectedLocation);
    if (score > currentThreshold) {
      break;
    }
    lastBitArr = bitArr;
  }
  const result = {
    isMatch: bestLocation >= 0,
    // Count exact matches (those with a score of 0) to be "almost" exact
    score: Math.max(0.001, finalScore)
  };
  if (computeMatches) {
    const indices = convertMaskToIndices(matchMask, minMatchCharLength);
    if (!indices.length) {
      result.isMatch = false;
    } else if (includeMatches) {
      result.indices = indices;
    }
  }
  return result;
}

function createPatternAlphabet(pattern) {
  const mask = {};
  for (let i = 0, len = pattern.length; i < len; i += 1) {
    const char = pattern.charAt(i);
    mask[char] = (mask[char] || 0) | 1 << len - i - 1;
  }
  return mask;
}

function mergeIndices(indices) {
  if (indices.length <= 1) return indices;
  indices.sort((a, b) => a[0] - b[0] || a[1] - b[1]);
  const merged = [indices[0]];
  for (let i = 1, len = indices.length; i < len; i += 1) {
    const last = merged[merged.length - 1];
    const curr = indices[i];
    if (curr[0] <= last[1] + 1) {
      last[1] = Math.max(last[1], curr[1]);
    } else {
      merged.push(curr);
    }
  }
  return merged;
}

// Characters that survive NFD normalization unchanged and need explicit mapping
const NON_DECOMPOSABLE_MAP = {
  '\u0142': 'l',
  // ł
  '\u0141': 'L',
  // Ł
  '\u0111': 'd',
  // đ
  '\u0110': 'D',
  // Đ
  '\u00F8': 'o',
  // ø
  '\u00D8': 'O',
  // Ø
  '\u0127': 'h',
  // ħ
  '\u0126': 'H',
  // Ħ
  '\u0167': 't',
  // ŧ
  '\u0166': 'T',
  // Ŧ
  '\u0131': 'i',
  // ı
  '\u00DF': 'ss' // ß
};
const NON_DECOMPOSABLE_RE = new RegExp('[' + Object.keys(NON_DECOMPOSABLE_MAP).join('') + ']', 'g');
const stripDiacritics = String.prototype.normalize ? str => str.normalize('NFD').replace(/[\u0300-\u036F\u0483-\u0489\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7\u06E8\u06EA-\u06ED\u0711\u0730-\u074A\u07A6-\u07B0\u07EB-\u07F3\u07FD\u0816-\u0819\u081B-\u0823\u0825-\u0827\u0829-\u082D\u0859-\u085B\u08D3-\u08E1\u08E3-\u0903\u093A-\u093C\u093E-\u094F\u0951-\u0957\u0962\u0963\u0981-\u0983\u09BC\u09BE-\u09C4\u09C7\u09C8\u09CB-\u09CD\u09D7\u09E2\u09E3\u09FE\u0A01-\u0A03\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A70\u0A71\u0A75\u0A81-\u0A83\u0ABC\u0ABE-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AE2\u0AE3\u0AFA-\u0AFF\u0B01-\u0B03\u0B3C\u0B3E-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B62\u0B63\u0B82\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD7\u0C00-\u0C04\u0C3E-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C62\u0C63\u0C81-\u0C83\u0CBC\u0CBE-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CE2\u0CE3\u0D00-\u0D03\u0D3B\u0D3C\u0D3E-\u0D44\u0D46-\u0D48\u0D4A-\u0D4D\u0D57\u0D62\u0D63\u0D82\u0D83\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DF2\u0DF3\u0E31\u0E34-\u0E3A\u0E47-\u0E4E\u0EB1\u0EB4-\u0EB9\u0EBB\u0EBC\u0EC8-\u0ECD\u0F18\u0F19\u0F35\u0F37\u0F39\u0F3E\u0F3F\u0F71-\u0F84\u0F86\u0F87\u0F8D-\u0F97\u0F99-\u0FBC\u0FC6\u102B-\u103E\u1056-\u1059\u105E-\u1060\u1062-\u1064\u1067-\u106D\u1071-\u1074\u1082-\u108D\u108F\u109A-\u109D\u135D-\u135F\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17B4-\u17D3\u17DD\u180B-\u180D\u1885\u1886\u18A9\u1920-\u192B\u1930-\u193B\u1A17-\u1A1B\u1A55-\u1A5E\u1A60-\u1A7C\u1A7F\u1AB0-\u1ABE\u1B00-\u1B04\u1B34-\u1B44\u1B6B-\u1B73\u1B80-\u1B82\u1BA1-\u1BAD\u1BE6-\u1BF3\u1C24-\u1C37\u1CD0-\u1CD2\u1CD4-\u1CE8\u1CED\u1CF2-\u1CF4\u1CF7-\u1CF9\u1DC0-\u1DF9\u1DFB-\u1DFF\u20D0-\u20F0\u2CEF-\u2CF1\u2D7F\u2DE0-\u2DFF\u302A-\u302F\u3099\u309A\uA66F-\uA672\uA674-\uA67D\uA69E\uA69F\uA6F0\uA6F1\uA802\uA806\uA80B\uA823-\uA827\uA880\uA881\uA8B4-\uA8C5\uA8E0-\uA8F1\uA8FF\uA926-\uA92D\uA947-\uA953\uA980-\uA983\uA9B3-\uA9C0\uA9E5\uAA29-\uAA36\uAA43\uAA4C\uAA4D\uAA7B-\uAA7D\uAAB0\uAAB2-\uAAB4\uAAB7\uAAB8\uAABE\uAABF\uAAC1\uAAEB-\uAAEF\uAAF5\uAAF6\uABE3-\uABEA\uABEC\uABED\uFB1E\uFE00-\uFE0F\uFE20-\uFE2F]/g, '').replace(NON_DECOMPOSABLE_RE, ch => NON_DECOMPOSABLE_MAP[ch]) : str => str;

class BitapSearch {
  constructor(pattern, {
    location = Config.location,
    threshold = Config.threshold,
    distance = Config.distance,
    includeMatches = Config.includeMatches,
    findAllMatches = Config.findAllMatches,
    minMatchCharLength = Config.minMatchCharLength,
    isCaseSensitive = Config.isCaseSensitive,
    ignoreDiacritics = Config.ignoreDiacritics,
    ignoreLocation = Config.ignoreLocation
  } = {}) {
    this.options = {
      location,
      threshold,
      distance,
      includeMatches,
      findAllMatches,
      minMatchCharLength,
      isCaseSensitive,
      ignoreDiacritics,
      ignoreLocation
    };
    pattern = isCaseSensitive ? pattern : pattern.toLowerCase();
    pattern = ignoreDiacritics ? stripDiacritics(pattern) : pattern;
    this.pattern = pattern;
    this.chunks = [];
    if (!this.pattern.length) {
      return;
    }
    const addChunk = (pattern, startIndex) => {
      this.chunks.push({
        pattern,
        alphabet: createPatternAlphabet(pattern),
        startIndex
      });
    };
    const len = this.pattern.length;
    if (len > MAX_BITS) {
      let i = 0;
      const remainder = len % MAX_BITS;
      const end = len - remainder;
      while (i < end) {
        addChunk(this.pattern.substr(i, MAX_BITS), i);
        i += MAX_BITS;
      }
      if (remainder) {
        const startIndex = len - MAX_BITS;
        addChunk(this.pattern.substr(startIndex), startIndex);
      }
    } else {
      addChunk(this.pattern, 0);
    }
  }
  searchIn(text) {
    const {
      isCaseSensitive,
      ignoreDiacritics,
      includeMatches
    } = this.options;
    text = isCaseSensitive ? text : text.toLowerCase();
    text = ignoreDiacritics ? stripDiacritics(text) : text;

    // Exact match
    if (this.pattern === text) {
      const result = {
        isMatch: true,
        score: 0
      };
      if (includeMatches) {
        result.indices = [[0, text.length - 1]];
      }
      return result;
    }

    // Otherwise, use Bitap algorithm
    const {
      location,
      distance,
      threshold,
      findAllMatches,
      minMatchCharLength,
      ignoreLocation
    } = this.options;
    const allIndices = [];
    let totalScore = 0;
    let hasMatches = false;
    this.chunks.forEach(({
      pattern,
      alphabet,
      startIndex
    }) => {
      const {
        isMatch,
        score,
        indices
      } = search(text, pattern, alphabet, {
        location: location + startIndex,
        distance,
        threshold,
        findAllMatches,
        minMatchCharLength,
        includeMatches,
        ignoreLocation
      });
      if (isMatch) {
        hasMatches = true;
      }
      totalScore += score;
      if (isMatch && indices) {
        allIndices.push(...indices);
      }
    });
    const result = {
      isMatch: hasMatches,
      score: hasMatches ? totalScore / this.chunks.length : 1
    };
    if (hasMatches && includeMatches) {
      result.indices = mergeIndices(allIndices);
    }
    return result;
  }
}

class BaseMatch {
  constructor(pattern) {
    this.pattern = pattern;
  }
  static isMultiMatch(pattern) {
    return getMatch(pattern, this.multiRegex);
  }
  static isSingleMatch(pattern) {
    return getMatch(pattern, this.singleRegex);
  }
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  search(_text) {
    return {
      isMatch: false,
      score: 1
    };
  }
}
function getMatch(pattern, exp) {
  const matches = pattern.match(exp);
  return matches ? matches[1] : null;
}

// Token: 'file
// Match type: exact-match
// Description: Items that are `file`

class ExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'exact';
  }
  static get multiRegex() {
    return /^="(.*)"$/;
  }
  static get singleRegex() {
    return /^=(.*)$/;
  }
  search(text) {
    const isMatch = text === this.pattern;
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [0, this.pattern.length - 1]
    };
  }
}

// Token: !fire
// Match type: inverse-exact-match
// Description: Items that do not include `fire`

class InverseExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'inverse-exact';
  }
  static get multiRegex() {
    return /^!"(.*)"$/;
  }
  static get singleRegex() {
    return /^!(.*)$/;
  }
  search(text) {
    const index = text.indexOf(this.pattern);
    const isMatch = index === -1;
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [0, text.length - 1]
    };
  }
}

// Token: ^file
// Match type: prefix-exact-match
// Description: Items that start with `file`
class PrefixExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'prefix-exact';
  }
  static get multiRegex() {
    return /^\^"(.*)"$/;
  }
  static get singleRegex() {
    return /^\^(.*)$/;
  }
  search(text) {
    const isMatch = text.startsWith(this.pattern);
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [0, this.pattern.length - 1]
    };
  }
}

// Token: !^fire
// Match type: inverse-prefix-exact-match
// Description: Items that do not start with `fire`

class InversePrefixExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'inverse-prefix-exact';
  }
  static get multiRegex() {
    return /^!\^"(.*)"$/;
  }
  static get singleRegex() {
    return /^!\^(.*)$/;
  }
  search(text) {
    const isMatch = !text.startsWith(this.pattern);
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [0, text.length - 1]
    };
  }
}

// Token: .file$
// Match type: suffix-exact-match
// Description: Items that end with `.file`
class SuffixExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'suffix-exact';
  }
  static get multiRegex() {
    return /^"(.*)"\$$/;
  }
  static get singleRegex() {
    return /^(.*)\$$/;
  }
  search(text) {
    const isMatch = text.endsWith(this.pattern);
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [text.length - this.pattern.length, text.length - 1]
    };
  }
}

// Token: !.file$
// Match type: inverse-suffix-exact-match
// Description: Items that do not end with `.file`
class InverseSuffixExactMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'inverse-suffix-exact';
  }
  static get multiRegex() {
    return /^!"(.*)"\$$/;
  }
  static get singleRegex() {
    return /^!(.*)\$$/;
  }
  search(text) {
    const isMatch = !text.endsWith(this.pattern);
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices: [0, text.length - 1]
    };
  }
}

class FuzzyMatch extends BaseMatch {
  constructor(pattern, {
    location = Config.location,
    threshold = Config.threshold,
    distance = Config.distance,
    includeMatches = Config.includeMatches,
    findAllMatches = Config.findAllMatches,
    minMatchCharLength = Config.minMatchCharLength,
    isCaseSensitive = Config.isCaseSensitive,
    ignoreDiacritics = Config.ignoreDiacritics,
    ignoreLocation = Config.ignoreLocation
  } = {}) {
    super(pattern);
    this._bitapSearch = new BitapSearch(pattern, {
      location,
      threshold,
      distance,
      includeMatches,
      findAllMatches,
      minMatchCharLength,
      isCaseSensitive,
      ignoreDiacritics,
      ignoreLocation
    });
  }
  static get type() {
    return 'fuzzy';
  }
  static get multiRegex() {
    return /^"(.*)"$/;
  }
  static get singleRegex() {
    return /^(.*)$/;
  }
  search(text) {
    return this._bitapSearch.searchIn(text);
  }
}

// Token: 'file
// Match type: include-match
// Description: Items that include `file`

class IncludeMatch extends BaseMatch {
  constructor(pattern) {
    super(pattern);
  }
  static get type() {
    return 'include';
  }
  static get multiRegex() {
    return /^'"(.*)"$/;
  }
  static get singleRegex() {
    return /^'(.*)$/;
  }
  search(text) {
    let location = 0;
    let index;
    const indices = [];
    const patternLen = this.pattern.length;

    // Get all exact matches
    while ((index = text.indexOf(this.pattern, location)) > -1) {
      location = index + patternLen;
      indices.push([index, location - 1]);
    }
    const isMatch = !!indices.length;
    return {
      isMatch,
      score: isMatch ? 0 : 1,
      indices
    };
  }
}

// ❗Order is important. DO NOT CHANGE.
const searchers = [ExactMatch, IncludeMatch, PrefixExactMatch, InversePrefixExactMatch, InverseSuffixExactMatch, SuffixExactMatch, InverseExactMatch, FuzzyMatch];
const searchersLen = searchers.length;
const ESCAPED_PIPE = '\u0000'; // placeholder for escaped \|
const OR_TOKEN = '|';

// Tokenize a query string into individual search terms.
// Respects multi-match quoted tokens like ="said "test"" or ^"hello world"$
// where inner spaces and quotes are part of the token.
function tokenize(pattern) {
  const tokens = [];
  const len = pattern.length;
  let i = 0;
  while (i < len) {
    // Skip spaces
    while (i < len && pattern[i] === ' ') i++;
    if (i >= len) break;

    // Scan past prefix characters (=, !, ^, ') to see if a quote follows
    let j = i;
    while (j < len && pattern[j] !== ' ' && pattern[j] !== '"') j++;
    if (j < len && pattern[j] === '"') {
      // Multi-match token: prefix + "content" (possibly with inner quotes)
      // Find the closing " that ends this token:
      // it must be followed by optional $, then space or end-of-string
      j++; // skip opening quote
      while (j < len) {
        if (pattern[j] === '"') {
          // Check if this is the closing quote
          const next = j + 1;
          if (next >= len || pattern[next] === ' ') {
            j++; // include closing quote
            break;
          }
          if (pattern[next] === '$' && (next + 1 >= len || pattern[next + 1] === ' ')) {
            j += 2; // include "$
            break;
          }
        }
        j++;
      }
      tokens.push(pattern.substring(i, j));
      i = j;
    } else {
      // Regular (unquoted) token: read until space or end
      while (j < len && pattern[j] !== ' ') j++;
      tokens.push(pattern.substring(i, j));
      i = j;
    }
  }
  return tokens;
}

// Return a 2D array representation of the query, for simpler parsing.
// Example:
// "^core go$ | rb$ | py$ xy$" => [["^core", "go$"], ["rb$"], ["py$", "xy$"]]
function parseQuery(pattern, options = {}) {
  // Replace escaped \| with placeholder before splitting on |
  const escaped = pattern.replace(/\\\|/g, ESCAPED_PIPE);
  return escaped.split(OR_TOKEN).map(item => {
    // Restore escaped pipes in each OR group
    const restored = item.replace(/\u0000/g, '|');
    const query = tokenize(restored.trim()).filter(item => item && !!item.trim());
    const results = [];
    for (let i = 0, len = query.length; i < len; i += 1) {
      const queryItem = query[i];

      // 1. Handle multiple query match (i.e, once that are quoted, like `"hello world"`)
      let found = false;
      let idx = -1;
      while (!found && ++idx < searchersLen) {
        const searcher = searchers[idx];
        const token = searcher.isMultiMatch(queryItem);
        if (token) {
          results.push(new searcher(token, options));
          found = true;
        }
      }
      if (found) {
        continue;
      }

      // 2. Handle single query matches (i.e, once that are *not* quoted)
      idx = -1;
      while (++idx < searchersLen) {
        const searcher = searchers[idx];
        const token = searcher.isSingleMatch(queryItem);
        if (token) {
          results.push(new searcher(token, options));
          break;
        }
      }
    }
    return results;
  });
}

// These extended matchers can return an array of matches, as opposed
// to a singl match
const MultiMatchSet = new Set([FuzzyMatch.type, IncludeMatch.type]);
class ExtendedSearch {
  constructor(pattern, {
    isCaseSensitive = Config.isCaseSensitive,
    ignoreDiacritics = Config.ignoreDiacritics,
    includeMatches = Config.includeMatches,
    minMatchCharLength = Config.minMatchCharLength,
    ignoreLocation = Config.ignoreLocation,
    findAllMatches = Config.findAllMatches,
    location = Config.location,
    threshold = Config.threshold,
    distance = Config.distance
  } = {}) {
    this.query = null;
    this.options = {
      isCaseSensitive,
      ignoreDiacritics,
      includeMatches,
      minMatchCharLength,
      findAllMatches,
      ignoreLocation,
      location,
      threshold,
      distance
    };
    pattern = isCaseSensitive ? pattern : pattern.toLowerCase();
    pattern = ignoreDiacritics ? stripDiacritics(pattern) : pattern;
    this.pattern = pattern;
    this.query = parseQuery(this.pattern, this.options);
  }
  static condition(_, options) {
    return options.useExtendedSearch;
  }

  // Note: searchIn operates on a single text value and sets hasInverse on the
  // result when inverse patterns are involved. _searchObjectList uses this to
  // switch from "ANY key" to "ALL keys" aggregation. See #712.
  searchIn(text) {
    const query = this.query;
    if (!query) {
      return {
        isMatch: false,
        score: 1
      };
    }
    const {
      includeMatches,
      isCaseSensitive,
      ignoreDiacritics
    } = this.options;
    text = isCaseSensitive ? text : text.toLowerCase();
    text = ignoreDiacritics ? stripDiacritics(text) : text;
    let numMatches = 0;
    const allIndices = [];
    let totalScore = 0;
    let hasInverse = false;

    // ORs
    for (let i = 0, qLen = query.length; i < qLen; i += 1) {
      const searchers = query[i];

      // Reset indices
      allIndices.length = 0;
      numMatches = 0;
      hasInverse = false;

      // ANDs
      for (let j = 0, pLen = searchers.length; j < pLen; j += 1) {
        const searcher = searchers[j];
        const {
          isMatch,
          indices,
          score
        } = searcher.search(text);
        if (isMatch) {
          numMatches += 1;
          totalScore += score;
          const type = searcher.constructor.type;
          if (type.startsWith('inverse')) {
            hasInverse = true;
          }
          if (includeMatches) {
            if (MultiMatchSet.has(type)) {
              allIndices.push(...indices);
            } else {
              allIndices.push(indices);
            }
          }
        } else {
          totalScore = 0;
          numMatches = 0;
          allIndices.length = 0;
          hasInverse = false;
          break;
        }
      }

      // OR condition, so if TRUE, return
      if (numMatches) {
        const result = {
          isMatch: true,
          score: totalScore / numMatches
        };
        if (hasInverse) {
          result.hasInverse = true;
        }
        if (includeMatches) {
          result.indices = mergeIndices(allIndices);
        }
        return result;
      }
    }

    // Nothing was matched
    return {
      isMatch: false,
      score: 1
    };
  }
}

const registeredSearchers = [];
function register(...args) {
  registeredSearchers.push(...args);
}
function createSearcher(pattern, options) {
  for (let i = 0, len = registeredSearchers.length; i < len; i += 1) {
    const searcherClass = registeredSearchers[i];
    if (searcherClass.condition(pattern, options)) {
      return new searcherClass(pattern, options);
    }
  }
  return new BitapSearch(pattern, options);
}

const LogicalOperator = {
  AND: '$and',
  OR: '$or'
};
const KeyType = {
  PATH: '$path',
  PATTERN: '$val'
};
const isExpression = query => !!(query[LogicalOperator.AND] || query[LogicalOperator.OR]);
const isPath = query => !!query[KeyType.PATH];
const isLeaf = query => !isArray(query) && isObject(query) && !isExpression(query);
const convertToExplicit = query => ({
  [LogicalOperator.AND]: Object.keys(query).map(key => ({
    [key]: query[key]
  }))
});

// When `auto` is `true`, the parse function will infer and initialize and add
// the appropriate `Searcher` instance
function parse(query, options, {
  auto = true
} = {}) {
  const next = query => {
    // Keyless string entry: search across all keys
    if (isString(query)) {
      const obj = {
        keyId: null,
        pattern: query
      };
      if (auto) {
        obj.searcher = createSearcher(query, options);
      }
      return obj;
    }
    const keys = Object.keys(query);
    const isQueryPath = isPath(query);
    if (!isQueryPath && keys.length > 1 && !isExpression(query)) {
      return next(convertToExplicit(query));
    }
    if (isLeaf(query)) {
      const key = isQueryPath ? query[KeyType.PATH] : keys[0];
      const pattern = isQueryPath ? query[KeyType.PATTERN] : query[key];
      if (!isString(pattern)) {
        throw new Error(LOGICAL_SEARCH_INVALID_QUERY_FOR_KEY(key));
      }
      const obj = {
        keyId: createKeyId(key),
        pattern
      };
      if (auto) {
        obj.searcher = createSearcher(pattern, options);
      }
      return obj;
    }
    const node = {
      children: [],
      operator: keys[0]
    };
    keys.forEach(key => {
      const value = query[key];
      if (isArray(value)) {
        value.forEach(item => {
          node.children.push(next(item));
        });
      }
    });
    return node;
  };
  if (!isExpression(query)) {
    query = convertToExplicit(query);
  }
  return next(query);
}

function computeScoreSingle(matches, {
  ignoreFieldNorm = Config.ignoreFieldNorm
}) {
  let totalScore = 1;
  matches.forEach(({
    key,
    norm,
    score
  }) => {
    const weight = key ? key.weight : null;
    totalScore *= Math.pow(score === 0 && weight ? Number.EPSILON : score, (weight || 1) * (ignoreFieldNorm ? 1 : norm));
  });
  return totalScore;
}
function computeScore(results, {
  ignoreFieldNorm = Config.ignoreFieldNorm
}) {
  results.forEach(result => {
    result.score = computeScoreSingle(result.matches, {
      ignoreFieldNorm
    });
  });
}

// Max-heap by score: keeps the worst (highest) score at the top
// so we can efficiently evict it when a better result arrives.
class MaxHeap {
  constructor(limit) {
    this.limit = limit;
    this.heap = [];
  }
  get size() {
    return this.heap.length;
  }
  shouldInsert(score) {
    return this.size < this.limit || score < this.heap[0].score;
  }
  insert(item) {
    if (this.size < this.limit) {
      this.heap.push(item);
      this._bubbleUp(this.size - 1);
    } else if (item.score < this.heap[0].score) {
      this.heap[0] = item;
      this._sinkDown(0);
    }
  }
  extractSorted(sortFn) {
    return this.heap.sort(sortFn);
  }
  _bubbleUp(i) {
    const heap = this.heap;
    while (i > 0) {
      const parent = i - 1 >> 1;
      if (heap[i].score <= heap[parent].score) break;
      const tmp = heap[i];
      heap[i] = heap[parent];
      heap[parent] = tmp;
      i = parent;
    }
  }
  _sinkDown(i) {
    const heap = this.heap;
    const len = heap.length;
    let largest = i;
    do {
      i = largest;
      const left = 2 * i + 1;
      const right = 2 * i + 2;
      if (left < len && heap[left].score > heap[largest].score) {
        largest = left;
      }
      if (right < len && heap[right].score > heap[largest].score) {
        largest = right;
      }
      if (largest !== i) {
        const tmp = heap[i];
        heap[i] = heap[largest];
        heap[largest] = tmp;
      }
    } while (largest !== i);
  }
}

function transformMatches(result, data) {
  const matches = result.matches;
  data.matches = [];
  if (!isDefined(matches)) {
    return;
  }
  matches.forEach(match => {
    if (!isDefined(match.indices) || !match.indices.length) {
      return;
    }
    const {
      indices,
      value
    } = match;
    const obj = {
      indices,
      value
    };
    if (match.key) {
      obj.key = match.key.src;
    }
    if (match.idx > -1) {
      obj.refIndex = match.idx;
    }
    data.matches.push(obj);
  });
}

function transformScore(result, data) {
  data.score = result.score;
}

function format(results, docs, {
  includeMatches = Config.includeMatches,
  includeScore = Config.includeScore
} = {}) {
  const transformers = [];
  if (includeMatches) transformers.push(transformMatches);
  if (includeScore) transformers.push(transformScore);
  return results.map(result => {
    const {
      idx
    } = result;
    const data = {
      item: docs[idx],
      refIndex: idx
    };
    if (transformers.length) {
      transformers.forEach(transformer => {
        transformer(result, data);
      });
    }
    return data;
  });
}

const WORD = /\b\w+\b/g;
function createAnalyzer({
  isCaseSensitive = false,
  ignoreDiacritics = false
} = {}) {
  return {
    tokenize(text) {
      if (!isCaseSensitive) {
        text = text.toLowerCase();
      }
      if (ignoreDiacritics) {
        text = stripDiacritics(text);
      }
      return text.match(WORD) || [];
    }
  };
}

function buildInvertedIndex(records, keyCount, analyzer) {
  const terms = new Map();
  const df = new Map();
  let fieldCount = 0;
  function addField(text, docIdx, keyIdx, subIdx) {
    const tokens = analyzer.tokenize(text);
    if (!tokens.length) return;
    fieldCount++;

    // Count term frequencies in this field
    const termFreqs = new Map();
    for (const token of tokens) {
      termFreqs.set(token, (termFreqs.get(token) || 0) + 1);
    }

    // Track which terms we've already counted for df in this field
    for (const [term, tf] of termFreqs) {
      const posting = {
        docIdx,
        keyIdx,
        subIdx,
        tf
      };
      let postings = terms.get(term);
      if (!postings) {
        postings = [];
        terms.set(term, postings);
      }
      postings.push(posting);
      df.set(term, (df.get(term) || 0) + 1);
    }
  }
  for (const record of records) {
    const {
      i: docIdx,
      v,
      $: fields
    } = record;

    // String list
    if (v !== undefined) {
      addField(v, docIdx, -1, -1);
      continue;
    }

    // Object list
    if (fields) {
      for (let keyIdx = 0; keyIdx < keyCount; keyIdx++) {
        const value = fields[keyIdx];
        if (!value) continue;
        if (Array.isArray(value)) {
          for (const sub of value) {
            addField(sub.v, docIdx, keyIdx, sub.i ?? -1);
          }
        } else {
          addField(value.v, docIdx, keyIdx, -1);
        }
      }
    }
  }
  return {
    terms,
    fieldCount,
    df
  };
}
function addToInvertedIndex(index, record, keyCount, analyzer) {
  const {
    i: docIdx,
    v,
    $: fields
  } = record;
  function addField(text, keyIdx, subIdx) {
    const tokens = analyzer.tokenize(text);
    if (!tokens.length) return;
    index.fieldCount++;
    const termFreqs = new Map();
    for (const token of tokens) {
      termFreqs.set(token, (termFreqs.get(token) || 0) + 1);
    }
    for (const [term, tf] of termFreqs) {
      const posting = {
        docIdx,
        keyIdx,
        subIdx,
        tf
      };
      let postings = index.terms.get(term);
      if (!postings) {
        postings = [];
        index.terms.set(term, postings);
      }
      postings.push(posting);
      index.df.set(term, (index.df.get(term) || 0) + 1);
    }
  }
  if (v !== undefined) {
    addField(v, -1, -1);
    return;
  }
  if (fields) {
    for (let keyIdx = 0; keyIdx < keyCount; keyIdx++) {
      const value = fields[keyIdx];
      if (!value) continue;
      if (Array.isArray(value)) {
        for (const sub of value) {
          addField(sub.v, keyIdx, sub.i ?? -1);
        }
      } else {
        addField(value.v, keyIdx, -1);
      }
    }
  }
}
function removeFromInvertedIndex(index, docIdx) {
  for (const [term, postings] of index.terms) {
    const filtered = postings.filter(p => p.docIdx !== docIdx);
    const removed = postings.length - filtered.length;
    if (removed > 0) {
      index.fieldCount -= removed;
      index.df.set(term, (index.df.get(term) || 0) - removed);
      if (filtered.length === 0) {
        index.terms.delete(term);
        index.df.delete(term);
      } else {
        index.terms.set(term, filtered);
      }
    }
  }
}

class Fuse {
  // Statics are assigned in entry.ts

  constructor(docs, options, index) {
    this.options = {
      ...Config,
      ...options
    };
    if (this.options.useExtendedSearch && false) ;
    if (this.options.useTokenSearch && false) ;
    this._keyStore = new KeyStore(this.options.keys);
    this._docs = docs;
    this._myIndex = null;
    this._invertedIndex = null;
    this.setCollection(docs, index);
    this._lastQuery = null;
    this._lastSearcher = null;
  }
  _getSearcher(query) {
    if (this._lastQuery === query) {
      return this._lastSearcher;
    }
    const opts = this._invertedIndex ? {
      ...this.options,
      _invertedIndex: this._invertedIndex
    } : this.options;
    const searcher = createSearcher(query, opts);
    this._lastQuery = query;
    this._lastSearcher = searcher;
    return searcher;
  }
  setCollection(docs, index) {
    this._docs = docs;
    if (index && !(index instanceof FuseIndex)) {
      throw new Error(INCORRECT_INDEX_TYPE);
    }
    this._myIndex = index || createIndex(this.options.keys, this._docs, {
      getFn: this.options.getFn,
      fieldNormWeight: this.options.fieldNormWeight
    });
    if (this.options.useTokenSearch) {
      const analyzer = createAnalyzer({
        isCaseSensitive: this.options.isCaseSensitive,
        ignoreDiacritics: this.options.ignoreDiacritics
      });
      this._invertedIndex = buildInvertedIndex(this._myIndex.records, this._myIndex.keys.length, analyzer);
    }
  }
  add(doc) {
    if (!isDefined(doc)) {
      return;
    }
    this._docs.push(doc);
    this._myIndex.add(doc);
    if (this._invertedIndex) {
      const record = this._myIndex.records[this._myIndex.records.length - 1];
      const analyzer = createAnalyzer({
        isCaseSensitive: this.options.isCaseSensitive,
        ignoreDiacritics: this.options.ignoreDiacritics
      });
      addToInvertedIndex(this._invertedIndex, record, this._myIndex.keys.length, analyzer);
    }
  }
  remove(predicate = () => false) {
    const results = [];
    const indicesToRemove = [];
    for (let i = 0, len = this._docs.length; i < len; i += 1) {
      if (predicate(this._docs[i], i)) {
        results.push(this._docs[i]);
        indicesToRemove.push(i);
      }
    }
    if (indicesToRemove.length) {
      if (this._invertedIndex) {
        for (const idx of indicesToRemove) {
          removeFromInvertedIndex(this._invertedIndex, idx);
        }
      }

      // Remove from docs in reverse to preserve indices
      for (let i = indicesToRemove.length - 1; i >= 0; i -= 1) {
        this._docs.splice(indicesToRemove[i], 1);
      }
      this._myIndex.removeAll(indicesToRemove);
    }
    return results;
  }
  removeAt(idx) {
    if (this._invertedIndex) {
      removeFromInvertedIndex(this._invertedIndex, idx);
    }
    const doc = this._docs.splice(idx, 1)[0];
    this._myIndex.removeAt(idx);
    return doc;
  }
  getIndex() {
    return this._myIndex;
  }
  search(query, options) {
    const {
      limit = -1
    } = options || {};
    const {
      includeMatches,
      includeScore,
      shouldSort,
      sortFn,
      ignoreFieldNorm
    } = this.options;

    // Empty string query returns all docs (useful for search UIs)
    if (isString(query) && !query.trim()) {
      let docs = this._docs.map((item, idx) => ({
        item,
        refIndex: idx
      }));
      if (isNumber(limit) && limit > -1) {
        docs = docs.slice(0, limit);
      }
      return docs;
    }
    const useHeap = isNumber(limit) && limit > 0 && isString(query);
    let results;
    if (useHeap) {
      const heap = new MaxHeap(limit);
      if (isString(this._docs[0])) {
        this._searchStringList(query, {
          heap,
          ignoreFieldNorm
        });
      } else {
        this._searchObjectList(query, {
          heap,
          ignoreFieldNorm
        });
      }
      results = heap.extractSorted(sortFn);
    } else {
      results = isString(query) ? isString(this._docs[0]) ? this._searchStringList(query) : this._searchObjectList(query) : this._searchLogical(query);
      computeScore(results, {
        ignoreFieldNorm
      });
      if (shouldSort) {
        results.sort(sortFn);
      }
      if (isNumber(limit) && limit > -1) {
        results = results.slice(0, limit);
      }
    }
    return format(results, this._docs, {
      includeMatches,
      includeScore
    });
  }
  _searchStringList(query, {
    heap,
    ignoreFieldNorm
  } = {}) {
    const searcher = this._getSearcher(query);
    const {
      records
    } = this._myIndex;
    const results = heap ? null : [];

    // Iterate over every string in the index
    records.forEach(({
      v: text,
      i: idx,
      n: norm
    }) => {
      if (!isDefined(text)) {
        return;
      }
      const {
        isMatch,
        score,
        indices
      } = searcher.searchIn(text);
      if (isMatch) {
        const result = {
          item: text,
          idx,
          matches: [{
            score,
            value: text,
            norm: norm,
            indices
          }]
        };
        if (heap) {
          result.score = computeScoreSingle(result.matches, {
            ignoreFieldNorm
          });
          if (heap.shouldInsert(result.score)) {
            heap.insert(result);
          }
        } else {
          results.push(result);
        }
      }
    });
    return results;
  }
  _searchLogical(query) {
    const expression = parse(query, this.options);
    const evaluate = (node, item, idx) => {
      if (!('children' in node)) {
        const {