timing.js - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

/**

 * Redux middleware that sets performance markers for all actions such that they

 * will appear in performance tooling under the User Timing API

*/

const mark = window.performance?.mark

  ? window.performance.mark.bind(window.performance)

  : () => {};

const measure = window.performance?.measure

  ? window.performance.measure.bind(window.performance)

  : () => {};

export function timing() {

  return next => action => {

    mark(`${action.type}_start`);

    const result = next(action);

    mark(`${action.type}_end`);

    measure(`${action.type}`, `${action.type}_start`, `${action.type}_end`);

    return result;

};