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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable no-underscore-dangle */
'use strict';
// MODULES //
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
var fulfill = require( './fulfill.js' );
var reject = require( './reject.js' );
var PENDING = require( './pending.js' );
// MAIN //
/**
* Resolves a promise according to the Promises/A+ specification.
*
* @private
* @param {Object} promise - promise
* @param {*} value - resolution value
* @returns {void}
*/
function resolve( promise, value ) {
var called;
var then;
if ( promise._state !== PENDING ) {
return;
}
if ( value === promise ) {
reject( promise, new TypeError( format( 'invalid value. A promise cannot be resolved with itself. Value: `%s`.', value ) ) );
return;
}
if (
value !== null &&
( typeof value === 'object' || typeof value === 'function' )
) {
try {
then = value.then;
} catch ( err ) {
reject( promise, err );
return;
}
if ( isFunction( then ) ) {
called = false;
try {
then.call( value, onFulfilled, onRejected );
} catch ( err ) {
if ( !called ) {
called = true;
reject( promise, err );
}
}
return;
}
}
fulfill( promise, value );
/**
* Callback invoked upon thenable fulfillment.
*
* @private
* @param {*} v - fulfillment value
*/
function onFulfilled( v ) {
if ( called ) {
return;
}
called = true;
resolve( promise, v );
}
/**
* Callback invoked upon thenable rejection.
*
* @private
* @param {*} r - rejection reason
*/
function onRejected( r ) {
if ( called ) {
return;
}
called = true;
reject( promise, r );
}
}
// EXPORTS //
module.exports = resolve;
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