@data-client/normalizr/lib/schemas/ImmutableUtils.js

Normalizes and denormalizes JSON according to schema for Redux and Flux applications

/**
 * Helpers to enable Immutable compatibility *without* bringing in
 * the 'immutable' package as a dependency.
 */

import { INVALID } from '../denormalize/symbol.js';

/**
 * Check if an object is immutable by checking if it has a key specific
 * to the immutable library.
 *
 * @param  {any} object
 * @return {bool}
 */
export function isImmutable(object) {
  return !!(typeof object.hasOwnProperty === 'function' && (Object.hasOwnProperty.call(object, '__ownerID') ||
  // Immutable.Map
  object._map && Object.hasOwnProperty.call(object._map, '__ownerID'))); // Immutable.Record
}

/**
 * Denormalize an immutable entity.
 *
 * @param  {Schema} schema
 * @param  {Immutable.Map|Immutable.Record} input
 * @param  {function} unvisit
 * @param  {function} getDenormalizedEntity
 * @return {Immutable.Map|Immutable.Record}
 */
export function denormalizeImmutable(schema, input, args, unvisit) {
  let deleted = false;
  const obj = Object.keys(schema).reduce((object, key) => {
    // Immutable maps cast keys to strings on write so we need to ensure
    // we're accessing them using string keys.
    const stringKey = `${key}`;
    const item = unvisit(schema[stringKey], object.get(stringKey));
    if (typeof item === 'symbol') {
      deleted = true;
    }
    if (object.has(stringKey)) {
      return object.set(stringKey, item);
    } else {
      return object;
    }
  }, input);
  return deleted ? INVALID : obj;
}
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