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Promise is implemented as a pair of objects. `napi_create_promise()` returns both a JavaScript promise and a newly allocated "deferred" in its out-params. The deferred is linked to the promise such that the deferred can be passed to `napi_resolve_deferred()` or `napi_reject_deferred()` to reject/resolve the promise. `napi_is_promise()` can be used to check if a `napi_value` is a native promise - that is, a promise created by the underlying engine, rather than a pure JS implementation of a promise. PR-URL: https://github.com/nodejs/node/pull/14365 Fixes: https://github.com/nodejs/abi-stable-node/issues/242 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Timothy Gu <timothygu99@gmail.com>
61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
'use strict';
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const common = require('../../common');
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const test_promise = require(`./build/${common.buildType}/test_promise`);
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const assert = require('assert');
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let expected_result, promise;
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// A resolution
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expected_result = 42;
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promise = test_promise.createPromise();
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promise.then(
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common.mustCall(function(result) {
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assert.strictEqual(result, expected_result,
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'promise resolved as expected');
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}),
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common.mustNotCall());
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test_promise.concludeCurrentPromise(expected_result, true);
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// A rejection
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expected_result = 'It\'s not you, it\'s me.';
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promise = test_promise.createPromise();
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promise.then(
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common.mustNotCall(),
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common.mustCall(function(result) {
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assert.strictEqual(result, expected_result,
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'promise rejected as expected');
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}));
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test_promise.concludeCurrentPromise(expected_result, false);
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// Chaining
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promise = test_promise.createPromise();
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promise.then(
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common.mustCall(function(result) {
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assert.strictEqual(result, 'chained answer',
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'resolving with a promise chains properly');
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}),
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common.mustNotCall());
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test_promise.concludeCurrentPromise(Promise.resolve('chained answer'), true);
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assert.strictEqual(test_promise.isPromise(promise), true,
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'natively created promise is recognized as a promise');
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assert.strictEqual(test_promise.isPromise(Promise.reject(-1)), true,
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'Promise created with JS is recognized as a promise');
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assert.strictEqual(test_promise.isPromise(2.4), false,
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'Number is recognized as not a promise');
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assert.strictEqual(test_promise.isPromise('I promise!'), false,
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'String is recognized as not a promise');
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assert.strictEqual(test_promise.isPromise(undefined), false,
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'undefined is recognized as not a promise');
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assert.strictEqual(test_promise.isPromise(null), false,
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'null is recognized as not a promise');
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assert.strictEqual(test_promise.isPromise({}), false,
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'an object is recognized as not a promise');
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