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test-util-promisify.js
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test-util-promisify.js
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'use strict';
// Flags: --expose-internals
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const vm = require('vm');
const { promisify } = require('util');
const { customPromisifyArgs } = require('internal/util');
{
const warningHandler = common.mustNotCall();
process.on('warning', warningHandler);
function foo() {}
foo.constructor = (async () => {}).constructor;
promisify(foo);
process.off('warning', warningHandler);
}
common.expectWarning(
'DeprecationWarning',
'Calling promisify on a function that returns a Promise is likely a mistake.',
'DEP0174');
promisify(async (callback) => { callback(); })().then(common.mustCall(() => {
// We must add the second `expectWarning` call in the `.then` handler, when
// the first warning has already been triggered.
common.expectWarning(
'DeprecationWarning',
'Calling promisify on a function that returns a Promise is likely a mistake.',
'DEP0174');
promisify(async () => {})().then(common.mustNotCall());
}));
const stat = promisify(fs.stat);
{
const promise = stat(__filename);
assert(promise instanceof Promise);
promise.then(common.mustCall((value) => {
assert.deepStrictEqual(value, fs.statSync(__filename));
}));
}
{
const promise = stat('/dontexist');
promise.catch(common.mustCall((error) => {
assert(error.message.includes('ENOENT: no such file or directory, stat'));
}));
}
{
function fn() {}
function promisifedFn() {}
fn[promisify.custom] = promisifedFn;
assert.strictEqual(promisify(fn), promisifedFn);
assert.strictEqual(promisify(promisify(fn)), promisifedFn);
}
{
function fn() {}
function promisifiedFn() {}
// util.promisify.custom is a shared symbol which can be accessed
// as `Symbol.for("nodejs.util.promisify.custom")`.
const kCustomPromisifiedSymbol = Symbol.for('nodejs.util.promisify.custom');
fn[kCustomPromisifiedSymbol] = promisifiedFn;
assert.strictEqual(kCustomPromisifiedSymbol, promisify.custom);
assert.strictEqual(promisify(fn), promisifiedFn);
assert.strictEqual(promisify(promisify(fn)), promisifiedFn);
}
{
function fn() {}
fn[promisify.custom] = 42;
assert.throws(
() => promisify(fn),
{ code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' }
);
}
{
const firstValue = 5;
const secondValue = 17;
function fn(callback) {
callback(null, firstValue, secondValue);
}
fn[customPromisifyArgs] = ['first', 'second'];
promisify(fn)().then(common.mustCall((obj) => {
assert.deepStrictEqual(obj, { first: firstValue, second: secondValue });
}));
}
{
const fn = vm.runInNewContext('(function() {})');
assert.notStrictEqual(Object.getPrototypeOf(promisify(fn)),
Function.prototype);
}
{
function fn(callback) {
callback(null, 'foo', 'bar');
}
promisify(fn)().then(common.mustCall((value) => {
assert.strictEqual(value, 'foo');
}));
}
{
function fn(callback) {
callback(null);
}
promisify(fn)().then(common.mustCall((value) => {
assert.strictEqual(value, undefined);
}));
}
{
function fn(callback) {
callback();
}
promisify(fn)().then(common.mustCall((value) => {
assert.strictEqual(value, undefined);
}));
}
{
function fn(err, val, callback) {
callback(err, val);
}
promisify(fn)(null, 42).then(common.mustCall((value) => {
assert.strictEqual(value, 42);
}));
}
{
function fn(err, val, callback) {
callback(err, val);
}
promisify(fn)(new Error('oops'), null).catch(common.mustCall((err) => {
assert.strictEqual(err.message, 'oops');
}));
}
{
function fn(err, val, callback) {
callback(err, val);
}
(async () => {
const value = await promisify(fn)(null, 42);
assert.strictEqual(value, 42);
})().then(common.mustCall());
}
{
const o = {};
const fn = promisify(function(cb) {
cb(null, this === o);
});
o.fn = fn;
o.fn().then(common.mustCall((val) => assert(val)));
}
{
const err = new Error('Should not have called the callback with the error.');
const stack = err.stack;
const fn = promisify(function(cb) {
cb(null);
cb(err);
});
(async () => {
await fn();
await Promise.resolve();
return assert.strictEqual(stack, err.stack);
})().then(common.mustCall());
}
{
function c() { }
const a = promisify(function() { });
const b = promisify(a);
assert.notStrictEqual(c, a);
assert.strictEqual(a, b);
}
{
let errToThrow;
const thrower = promisify(function(a, b, c, cb) {
errToThrow = new Error();
throw errToThrow;
});
thrower(1, 2, 3)
.then(assert.fail)
.then(assert.fail, (e) => assert.strictEqual(e, errToThrow));
}
{
const err = new Error();
const a = promisify((cb) => cb(err))();
const b = promisify(() => { throw err; })();
Promise.all([
a.then(assert.fail, function(e) {
assert.strictEqual(err, e);
}),
b.then(assert.fail, function(e) {
assert.strictEqual(err, e);
}),
]);
}
[undefined, null, true, 0, 'str', {}, [], Symbol()].forEach((input) => {
assert.throws(
() => promisify(input),
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError',
message: 'The "original" argument must be of type function.' +
common.invalidArgTypeHelper(input)
});
});