Function getExperimentToggles

src/experiments/index.js:183–206

* Returns a set of experiment IDs currently on. * @param {Window} win * @return {ExperimentTogglesMap}

(win)

 * @return {ExperimentTogglesMap}
 */
function getExperimentToggles(win) {
  let experimentsString = '';
  try {
    if ('localStorage' in win) {
      experimentsString = win.localStorage.getItem(LOCAL_STORAGE_KEY) ?? '';
    }
  } catch {
    dev().warn(TAG, 'Failed to retrieve experiments from localStorage.');
  }
  const tokens = experimentsString?.split(/\s*,\s*/g) || [];

  const toggles = map();
  for (const token of tokens) {
    if (!token) {
      continue;
    }
    if (token[0] == '-') {
      toggles[token.substr(1)] = false;
    } else {
      toggles[token] = true;
    }
  }
  return toggles;
}

/**
 * Saves a set of experiment IDs currently on.