browser_console_jsterm_await.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

// This is a lightweight version of browser_jsterm_await.js to only ensure top-level await

// support in the Browser Console.

"use strict";

const TEST_URI =

  "data:text/html;charset=utf-8,<!DOCTYPE html>Top-level await Browser Console test";

add_task(async function () {

  // Needed for the execute() function below

  await pushPref("security.allow_parent_unrestricted_js_loads", true);

  // Enable await mapping.

  await pushPref("devtools.debugger.features.map-await-expression", true);

  await addTab(TEST_URI);

  const hud = await BrowserConsoleManager.toggleBrowserConsole();

  info("Evaluate a top-level await expression");

  const simpleAwait = `await new Promise(r => setTimeout(() => r(["await1"]), 500))`;

  await executeAndWaitForResultMessage(hud, simpleAwait, `Array [ "await1" ]`);

  // Check that the resulting promise of the async iife is not displayed.

  const messages = hud.ui.outputNode.querySelectorAll(".message .message-body");

  const messagesText = Array.from(messages)

    .map(n => n.textContent)

    .join(" - ");

is(

    messagesText.includes("Promise {"),

    false,

    "The output does not contain a Promise"

);

ok(

    messagesText.includes(simpleAwait) &&

      messagesText.includes(`Array [ "await1" ]`),

    "The output contains the the expected messages"

);

});