@react-native-firebase/app/dist/module/internal/web/memidb/lib/cmp.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

"use strict";

import { DataError } from './errors.js';
import valueToKey from './valueToKey.js';
const getType = x => {
  if (typeof x === 'number') {
    return 'Number';
  }
  if (Object.prototype.toString.call(x) === '[object Date]') {
    return 'Date';
  }
  if (Array.isArray(x)) {
    return 'Array';
  }
  if (typeof x === 'string') {
    return 'String';
  }
  if (x instanceof ArrayBuffer) {
    return 'Binary';
  }
  throw new DataError();
};

// https://w3c.github.io/IndexedDB/#compare-two-keys
const cmp = (first, second) => {
  if (second === undefined) {
    throw new TypeError();
  }
  first = valueToKey(first);
  second = valueToKey(second);
  const t1 = getType(first);
  const t2 = getType(second);
  if (t1 !== t2) {
    if (t1 === 'Array') {
      return 1;
    }
    if (t1 === 'Binary' && (t2 === 'String' || t2 === 'Date' || t2 === 'Number')) {
      return 1;
    }
    if (t1 === 'String' && (t2 === 'Date' || t2 === 'Number')) {
      return 1;
    }
    if (t1 === 'Date' && t2 === 'Number') {
      return 1;
    }
    return -1;
  }
  if (t1 === 'Binary') {
    first = new Uint8Array(first);
    second = new Uint8Array(second);
  }
  if (t1 === 'Array' || t1 === 'Binary') {
    const length = Math.min(first.length, second.length);
    for (let i = 0; i < length; i++) {
      const result = cmp(first[i], second[i]);
      if (result !== 0) {
        return result;
      }
    }
    if (first.length > second.length) {
      return 1;
    }
    if (first.length < second.length) {
      return -1;
    }
    return 0;
  }
  if (t1 === 'Date') {
    if (first.getTime() === second.getTime()) {
      return 0;
    }
  } else {
    if (first === second) {
      return 0;
    }
  }
  return first > second ? 1 : -1;
};
export default cmp;
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