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Diffstat (limited to 'node_modules/core-js/modules/es6.promise.js')
| -rw-r--r-- | node_modules/core-js/modules/es6.promise.js | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/node_modules/core-js/modules/es6.promise.js b/node_modules/core-js/modules/es6.promise.js new file mode 100644 index 00000000..b0ff3bfc --- /dev/null +++ b/node_modules/core-js/modules/es6.promise.js @@ -0,0 +1,286 @@ +'use strict'; +var LIBRARY = require('./_library'); +var global = require('./_global'); +var ctx = require('./_ctx'); +var classof = require('./_classof'); +var $export = require('./_export'); +var isObject = require('./_is-object'); +var aFunction = require('./_a-function'); +var anInstance = require('./_an-instance'); +var forOf = require('./_for-of'); +var speciesConstructor = require('./_species-constructor'); +var task = require('./_task').set; +var microtask = require('./_microtask')(); +var newPromiseCapabilityModule = require('./_new-promise-capability'); +var perform = require('./_perform'); +var userAgent = require('./_user-agent'); +var promiseResolve = require('./_promise-resolve'); +var PROMISE = 'Promise'; +var TypeError = global.TypeError; +var process = global.process; +var versions = process && process.versions; +var v8 = versions && versions.v8 || ''; +var $Promise = global[PROMISE]; +var isNode = classof(process) == 'process'; +var empty = function () { /* empty */ }; +var Internal, newGenericPromiseCapability, OwnPromiseCapability, Wrapper; +var newPromiseCapability = newGenericPromiseCapability = newPromiseCapabilityModule.f; + +var USE_NATIVE = !!function () { + try { + // correct subclassing with @@species support + var promise = $Promise.resolve(1); + var FakePromise = (promise.constructor = {})[require('./_wks')('species')] = function (exec) { + exec(empty, empty); + }; + // unhandled rejections tracking support, NodeJS Promise without it fails @@species test + return (isNode || typeof PromiseRejectionEvent == 'function') + && promise.then(empty) instanceof FakePromise + // v8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables + // https://bugs.chromium.org/p/chromium/issues/detail?id=830565 + // we can't detect it synchronously, so just check versions + && v8.indexOf('6.6') !== 0 + && userAgent.indexOf('Chrome/66') === -1; + } catch (e) { /* empty */ } +}(); + +// helpers +var isThenable = function (it) { + var then; + return isObject(it) && typeof (then = it.then) == 'function' ? then : false; +}; +var notify = function (promise, isReject) { + if (promise._n) return; + promise._n = true; + var chain = promise._c; + microtask(function () { + var value = promise._v; + var ok = promise._s == 1; + var i = 0; + var run = function (reaction) { + var handler = ok ? reaction.ok : reaction.fail; + var resolve = reaction.resolve; + var reject = reaction.reject; + var domain = reaction.domain; + var result, then, exited; + try { + if (handler) { + if (!ok) { + if (promise._h == 2) onHandleUnhandled(promise); + promise._h = 1; + } + if (handler === true) result = value; + else { + if (domain) domain.enter(); + result = handler(value); // may throw + if (domain) { + domain.exit(); + exited = true; + } + } + if (result === reaction.promise) { + reject(TypeError('Promise-chain cycle')); + } else if (then = isThenable(result)) { + then.call(result, resolve, reject); + } else resolve(result); + } else reject(value); + } catch (e) { + if (domain && !exited) domain.exit(); + reject(e); + } + }; + while (chain.length > i) run(chain[i++]); // variable length - can't use forEach + promise._c = []; + promise._n = false; + if (isReject && !promise._h) onUnhandled(promise); + }); +}; +var onUnhandled = function (promise) { + task.call(global, function () { + var value = promise._v; + var unhandled = isUnhandled(promise); + var result, handler, console; + if (unhandled) { + result = perform(function () { + if (isNode) { + process.emit('unhandledRejection', value, promise); + } else if (handler = global.onunhandledrejection) { + handler({ promise: promise, reason: value }); + } else if ((console = global.console) && console.error) { + console.error('Unhandled promise rejection', value); + } + }); + // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should + promise._h = isNode || isUnhandled(promise) ? 2 : 1; + } promise._a = undefined; + if (unhandled && result.e) throw result.v; + }); +}; +var isUnhandled = function (promise) { + return promise._h !== 1 && (promise._a || promise._c).length === 0; +}; +var onHandleUnhandled = function (promise) { + task.call(global, function () { + var handler; + if (isNode) { + process.emit('rejectionHandled', promise); + } else if (handler = global.onrejectionhandled) { + handler({ promise: promise, reason: promise._v }); + } + }); +}; +var $reject = function (value) { + var promise = this; + if (promise._d) return; + promise._d = true; + promise = promise._w || promise; // unwrap + promise._v = value; + promise._s = 2; + if (!promise._a) promise._a = promise._c.slice(); + notify(promise, true); +}; +var $resolve = function (value) { + var promise = this; + var then; + if (promise._d) return; + promise._d = true; + promise = promise._w || promise; // unwrap + try { + if (promise === value) throw TypeError("Promise can't be resolved itself"); + if (then = isThenable(value)) { + microtask(function () { + var wrapper = { _w: promise, _d: false }; // wrap + try { + then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1)); + } catch (e) { + $reject.call(wrapper, e); + } + }); + } else { + promise._v = value; + promise._s = 1; + notify(promise, false); + } + } catch (e) { + $reject.call({ _w: promise, _d: false }, e); // wrap + } +}; + +// constructor polyfill +if (!USE_NATIVE) { + // 25.4.3.1 Promise(executor) + $Promise = function Promise(executor) { + anInstance(this, $Promise, PROMISE, '_h'); + aFunction(executor); + Internal.call(this); + try { + executor(ctx($resolve, this, 1), ctx($reject, this, 1)); + } catch (err) { + $reject.call(this, err); + } + }; + // eslint-disable-next-line no-unused-vars + Internal = function Promise(executor) { + this._c = []; // <- awaiting reactions + this._a = undefined; // <- checked in isUnhandled reactions + this._s = 0; // <- state + this._d = false; // <- done + this._v = undefined; // <- value + this._h = 0; // <- rejection state, 0 - default, 1 - handled, 2 - unhandled + this._n = false; // <- notify + }; + Internal.prototype = require('./_redefine-all')($Promise.prototype, { + // 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected) + then: function then(onFulfilled, onRejected) { + var reaction = newPromiseCapability(speciesConstructor(this, $Promise)); + reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true; + reaction.fail = typeof onRejected == 'function' && onRejected; + reaction.domain = isNode ? process.domain : undefined; + this._c.push(reaction); + if (this._a) this._a.push(reaction); + if (this._s) notify(this, false); + return reaction.promise; + }, + // 25.4.5.1 Promise.prototype.catch(onRejected) + 'catch': function (onRejected) { + return this.then(undefined, onRejected); + } + }); + OwnPromiseCapability = function () { + var promise = new Internal(); + this.promise = promise; + this.resolve = ctx($resolve, promise, 1); + this.reject = ctx($reject, promise, 1); + }; + newPromiseCapabilityModule.f = newPromiseCapability = function (C) { + return C === $Promise || C === Wrapper + ? new OwnPromiseCapability(C) + : newGenericPromiseCapability(C); + }; +} + +$export($export.G + $export.W + $export.F * !USE_NATIVE, { Promise: $Promise }); +require('./_set-to-string-tag')($Promise, PROMISE); +require('./_set-species')(PROMISE); +Wrapper = require('./_core')[PROMISE]; + +// statics +$export($export.S + $export.F * !USE_NATIVE, PROMISE, { + // 25.4.4.5 Promise.reject(r) + reject: function reject(r) { + var capability = newPromiseCapability(this); + var $$reject = capability.reject; + $$reject(r); + return capability.promise; + } +}); +$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, { + // 25.4.4.6 Promise.resolve(x) + resolve: function resolve(x) { + return promiseResolve(LIBRARY && this === Wrapper ? $Promise : this, x); + } +}); +$export($export.S + $export.F * !(USE_NATIVE && require('./_iter-detect')(function (iter) { + $Promise.all(iter)['catch'](empty); +})), PROMISE, { + // 25.4.4.1 Promise.all(iterable) + all: function all(iterable) { + var C = this; + var capability = newPromiseCapability(C); + var resolve = capability.resolve; + var reject = capability.reject; + var result = perform(function () { + var values = []; + var index = 0; + var remaining = 1; + forOf(iterable, false, function (promise) { + var $index = index++; + var alreadyCalled = false; + values.push(undefined); + remaining++; + C.resolve(promise).then(function (value) { + if (alreadyCalled) return; + alreadyCalled = true; + values[$index] = value; + --remaining || resolve(values); + }, reject); + }); + --remaining || resolve(values); + }); + if (result.e) reject(result.v); + return capability.promise; + }, + // 25.4.4.4 Promise.race(iterable) + race: function race(iterable) { + var C = this; + var capability = newPromiseCapability(C); + var reject = capability.reject; + var result = perform(function () { + forOf(iterable, false, function (promise) { + C.resolve(promise).then(capability.resolve, reject); + }); + }); + if (result.e) reject(result.v); + return capability.promise; + } +}); |