Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 32x 32x 32x 1x 1x 32x 9x 9x 22x 22x 22x 22x 22x 22x 32x 1x 1x 22x 22x 22x 22x 22x 22x 22x 22x 22x 19x 19x 22x 22x 22x 22x 22x 22x 22x 22x 5x 1x 1x 4x 5x 32x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 11x 11x 11x 11x 11x 22x 11x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1x 1x 1x 1x 1x 1x | /**
* @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-restricted-syntax, no-invalid-this, no-underscore-dangle */
'use strict';
// MODULES //
var isFunction = require( '@stdlib/assert/is-function' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var format = require( '@stdlib/string/format' );
var handle = require( './handle.js' );
var resolve = require( './resolve.js' );
var reject = require( './reject.js' );
var PENDING = require( './pending.js' );
// MAIN //
/**
* Promise constructor polyfill.
*
* @constructor
* @param {Function} executor - function invoked immediately with `resolve` and `reject` callbacks
* @throws {TypeError} must invoke with the `new` keyword
* @throws {TypeError} must provide an executor function
* @returns {Promise} promise instance
*
* @example
* function executor( resolve ) {
* resolve( 'beep' );
* }
*
* var p = new Promise( executor );
*
* p.then( onResolve );
*
* function onResolve( value ) {
* console.log( value );
* // => 'beep'
* }
*/
function Promise( executor ) {
var self;
if ( !( this instanceof Promise ) ) {
throw new TypeError( format( 'invalid invocation. Constructor must be called with the `new` operator.' ) );
}
if ( !isFunction( executor ) ) {
throw new TypeError( format( 'invalid argument. Must provide a function. Value: `%s`.', executor ) );
}
self = this;
this._state = PENDING;
this._value = void 0;
this._handlers = [];
try {
executor( onResolve, onReject );
} catch ( err ) {
onReject( err );
}
return this;
/**
* Resolves a promise.
*
* @private
* @param {*} value - resolution value
*/
function onResolve( value ) {
resolve( self, value );
}
/**
* Rejects a promise.
*
* @private
* @param {*} reason - rejection reason
*/
function onReject( reason ) {
if ( self._state !== PENDING ) {
return;
}
reject( self, reason );
}
}
/**
* Attaches fulfillment and rejection handlers to a promise.
*
* @name then
* @memberof Promise.prototype
* @type {Function}
* @param {Function} [onFulfilled] - fulfillment handler
* @param {Function} [onRejected] - rejection handler
* @returns {Promise} new promise
*/
setReadOnly( Promise.prototype, 'then', function then( onFulfilled, onRejected ) {
var self = this;
return new Promise( executor );
/**
* Promise executor.
*
* @private
* @param {Function} resolveValue - resolve callback
* @param {Function} rejectValue - reject callback
*/
function executor( resolveValue, rejectValue ) {
self._handlers.push({
'onFulfilled': createHandler( onFulfilled, true ),
'onRejected': createHandler( onRejected, false )
});
handle( self );
/**
* Returns a handler wrapper.
*
* @private
* @param {Function} cb - callback
* @param {boolean} isFulfilled - boolean indicating whether the callback is a fulfillment handler
* @returns {Function} handler
*/
function createHandler( cb, isFulfilled ) {
return wrapper;
/**
* Invokes a settlement handler.
*
* @private
* @param {*} value - settlement value
* @returns {void}
*/
function wrapper( value ) {
if ( !isFunction( cb ) ) {
if ( isFulfilled ) {
return resolveValue( value );
}
return rejectValue( value );
}
try {
return resolveValue( cb( value ) );
} catch ( err ) {
return rejectValue( err );
}
}
}
}
});
/**
* Attaches a rejection handler to a promise.
*
* @name catch
* @memberof Promise.prototype
* @type {Function}
* @param {Function} onRejected - rejection handler
* @returns {Promise} new promise
*/
setReadOnly( Promise.prototype, 'catch', function promiseCatch( onRejected ) {
return this.then( null, onRejected );
});
/**
* Returns a promise resolved with a provided value.
*
* @name resolve
* @memberof Promise
* @type {Function}
* @param {*} value - resolution value
* @returns {Promise} promise
*/
setReadOnly( Promise, 'resolve', function promiseResolve( value ) {
if ( value instanceof Promise ) {
return value;
}
return new Promise( executor );
/**
* Promise executor.
*
* @private
* @param {Function} resolveValue - resolve callback
*/
function executor( resolveValue ) {
resolveValue( value );
}
});
/**
* Returns a promise rejected with a provided reason.
*
* @name reject
* @memberof Promise
* @type {Function}
* @param {*} reason - rejection reason
* @returns {Promise} promise
*/
setReadOnly( Promise, 'reject', function promiseReject( reason ) {
return new Promise( executor );
/**
* Promise executor.
*
* @private
* @param {Function} resolveValue - resolve callback
* @param {Function} rejectValue - reject callback
*/
function executor( resolveValue, rejectValue ) {
rejectValue( reason );
}
});
// EXPORTS //
module.exports = Promise;
|