no-async-in-loops.md

Disallow async calls in loops (qunit/no-async-in-loops)

💼 This rule is enabled in the ✅ recommended config.

Asynchronous operations are much harder to reason about in loops. To increase maintainability, asynchronous operations should not be placed within loops.

Rule Details

The following patterns are considered warnings:

QUnit.test("Test name", function () {
    while (false) { QUnit.stop(); }
});

QUnit.test("Test name", function () {
    while (false) { QUnit.start(); }
});

QUnit.test("Test name", function (assert) {
    while (false) { assert.async(); }
});

QUnit.test("Test name", function () {
    do { QUnit.stop(); } while (false);
});

QUnit.test("Test name", function () {
    do { QUnit.start(); } while (false);
});

QUnit.test("Test name", function (assert) {
    do { assert.async(); } while (false);
});

QUnit.test("Test name", function () {
    for (;;) { QUnit.stop(); }
});

QUnit.test("Test name", function () {
    for (;;) { QUnit.start(); }
});

QUnit.test("Test name", function (assert) {
    for (;;) { assert.async(); }
});

QUnit.test("Test name", function () {
    for (i in obj) { QUnit.stop(); }
});

QUnit.test("Test name", function () {
    for (i in obj) { QUnit.start(); }
});

QUnit.test("Test name", function (assert) {
    for (i in obj) { assert.async(); }
});

QUnit.test("Test name", function () {
    for (i of obj) { QUnit.stop(); }
});

QUnit.test("Test name", function () {
    for (i of obj) { QUnit.start(); }
});

QUnit.test("Test name", function (assert) {
    for (i of obj) { assert.async(); }
});

The following patterns are not warnings:

QUnit.test("Test name", function () {
    QUnit.stop();
    QUnit.start();
});

QUnit.test("Test name", function (assert) {
    var done = assert.async();
});

When Not to Use This Rule

This rule can be disabled if it is common to write async setup or resolution calls in loops in your codebase.

Further Reading

• QUnit.stop()
• QUnit.start()
• assert.async()