app/javascript/mastodon/actions/store.js


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import Immutable from 'immutable';

export const STORE_HYDRATE = 'STORE_HYDRATE';

const convertState = rawState =>
  Immutable.fromJS(rawState, (k, v) =>
    Immutable.Iterable.isIndexed(v) ? v.toList() : v.toMap().mapKeys(x =>
      Number.isNaN(x * 1) ? x : x * 1));

export function hydrateStore(rawState) {
  const state = convertState(rawState);

  return {
    type: STORE_HYDRATE,
    state
  };
};