Function installRepl

build-system/tasks/e2e/repl.js:24–69

* Adds a REPL-like debugging experience to E2E tests. * Usage: * 1. In a test, add `await repl(this);` where `this` is mocha's this context. * This will cause the test to wait indefinitely when you want to execute * commands in the DevTools console. * You may have to change `async() =>

(global, env)

 * @param {!Object} env
 */
function installRepl(global, env) {
  let replPromise = null;
  let replResolve = null;

  /**
   * Usage: in a test, await repl();
   * @param {*} mochaThis
   * @return {!Promise}
   */
  global.repl = function (mochaThis) {
    mochaThis.timeout(REPL_INFINITE_TIMEOUT);

    const {controller} = env;
    global.repl.controller = controller;
    global.repl.env = env;
    global.repl.continue = replContinue;

    if (!replPromise) {
      replPromise = new Promise((resolve) => {
        replResolve = resolve;
      });
    }

    console./*OK*/ log(READY_MESSAGE);

    return replPromise;
  };

  /**
   * Continues execution while debugging.
   */
  function replContinue() {
    if (!replResolve) {
      return;
    }

    replResolve();
    replResolve = null;
    replPromise = null;
    delete global.repl.controller;
    delete global.repl.env;
    delete global.repl.continue;

    console./*OK*/ log(CONTINUE_MESSAGE);
  }
}

/**
 * Ends the debugging session.