@react-native-firebase/app/lib/internal/web/structuredClone/index.js

A well tested, feature rich Firebase implementation for React Native, supporting iOS & Android. Individual module support for Admob, Analytics, Auth, Crash Reporting, Cloud Firestore, Database, Dynamic Links, Functions, Messaging (FCM), Remote Config, Sto

const VOID = -1;
const PRIMITIVE = 0;
const ARRAY = 1;
const OBJECT = 2;
const DATE = 3;
const REGEXP = 4;
const MAP = 5;
const SET = 6;
const ERROR = 7;
const BIGINT = 8;

const env = typeof self === 'object' ? self : globalThis;

const deserializer = ($, _) => {
  const as = (out, index) => {
    $.set(index, out);
    return out;
  };

  const unpair = index => {
    if ($.has(index)) return $.get(index);

    const [type, value] = _[index];
    switch (type) {
      case PRIMITIVE:
      case VOID:
        return as(value, index);
      case ARRAY: {
        const arr = as([], index);
        for (const index of value) arr.push(unpair(index));
        return arr;
      }
      case OBJECT: {
        const object = as({}, index);
        for (const [key, index] of value) object[unpair(key)] = unpair(index);
        return object;
      }
      case DATE:
        return as(new Date(value), index);
      case REGEXP: {
        const { source, flags } = value;
        return as(new RegExp(source, flags), index);
      }
      case MAP: {
        const map = as(new Map(), index);
        for (const [key, index] of value) map.set(unpair(key), unpair(index));
        return map;
      }
      case SET: {
        const set = as(new Set(), index);
        for (const index of value) set.add(unpair(index));
        return set;
      }
      case ERROR: {
        const { name, message } = value;
        return as(new env[name](message), index);
      }
      case BIGINT:
        return as(BigInt(value), index);
      case 'BigInt':
        return as(Object(BigInt(value)), index);
    }
    return as(new env[type](value), index);
  };

  return unpair;
};

/**
 * @typedef {Array<string,any>} Record a type representation
 */

/**
 * Returns a deserialized value from a serialized array of Records.
 * @param {Record[]} serialized a previously serialized value.
 * @returns {any}
 */
const deserialize = serialized => deserializer(new Map(), serialized)(0);

const EMPTY = '';

const { toString } = {};
const { keys } = Object;

const typeOf = value => {
  const type = typeof value;
  if (type !== 'object' || !value) return [PRIMITIVE, type];

  const asString = toString.call(value).slice(8, -1);
  switch (asString) {
    case 'Array':
      return [ARRAY, EMPTY];
    case 'Object':
      return [OBJECT, EMPTY];
    case 'Date':
      return [DATE, EMPTY];
    case 'RegExp':
      return [REGEXP, EMPTY];
    case 'Map':
      return [MAP, EMPTY];
    case 'Set':
      return [SET, EMPTY];
  }

  if (asString.includes('Array')) return [ARRAY, asString];

  if (asString.includes('Error')) return [ERROR, asString];

  return [OBJECT, asString];
};

const shouldSkip = ([TYPE, type]) =>
  TYPE === PRIMITIVE && (type === 'function' || type === 'symbol');

const serializer = (strict, json, $, _) => {
  const as = (out, value) => {
    const index = _.push(out) - 1;
    $.set(value, index);
    return index;
  };

  const pair = value => {
    if ($.has(value)) return $.get(value);

    let [TYPE, type] = typeOf(value);
    switch (TYPE) {
      case PRIMITIVE: {
        let entry = value;
        switch (type) {
          case 'bigint':
            TYPE = BIGINT;
            entry = value.toString();
            break;
          case 'function':
          case 'symbol':
            if (strict) throw new TypeError('unable to serialize ' + type);
            entry = null;
            break;
          case 'undefined':
            return as([VOID], value);
        }
        return as([TYPE, entry], value);
      }
      case ARRAY: {
        if (type) return as([type, [...value]], value);

        const arr = [];
        const index = as([TYPE, arr], value);
        for (const entry of value) arr.push(pair(entry));
        return index;
      }
      case OBJECT: {
        if (type) {
          switch (type) {
            case 'BigInt':
              return as([type, value.toString()], value);
            case 'Boolean':
            case 'Number':
            case 'String':
              return as([type, value.valueOf()], value);
          }
        }

        if (json && 'toJSON' in value) return pair(value.toJSON());

        const entries = [];
        const index = as([TYPE, entries], value);
        for (const key of keys(value)) {
          if (strict || !shouldSkip(typeOf(value[key])))
            entries.push([pair(key), pair(value[key])]);
        }
        return index;
      }
      case DATE:
        return as([TYPE, value.toISOString()], value);
      case REGEXP: {
        const { source, flags } = value;
        return as([TYPE, { source, flags }], value);
      }
      case MAP: {
        const entries = [];
        const index = as([TYPE, entries], value);
        for (const [key, entry] of value) {
          if (strict || !(shouldSkip(typeOf(key)) || shouldSkip(typeOf(entry))))
            entries.push([pair(key), pair(entry)]);
        }
        return index;
      }
      case SET: {
        const entries = [];
        const index = as([TYPE, entries], value);
        for (const entry of value) {
          if (strict || !shouldSkip(typeOf(entry))) entries.push(pair(entry));
        }
        return index;
      }
    }

    const { message } = value;
    return as([TYPE, { name: type, message }], value);
  };

  return pair;
};

function serialize(value, { json, lossy } = {}) {
  const _ = [];
  return serializer(!(json || lossy), !!json, new Map(), _)(value), _;
}

let sCloneAvailable = false;
export function makeStructuredCloneAvailable() {
  if (sCloneAvailable) {
    return;
  }
  if (!global.window) {
    global.window = {};
  }
  if (!window.structuredClone) {
    window.structuredClone = (any, options) => deserialize(serialize(any, options));
  }
}