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rOACCT/node_modules/core-js/modules/es.promise.constructor.js
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es.promise.constructor.js
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'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var IS_NODE = require('../internals/engine-is-node');
var global = require('../internals/global');
var call = require('../internals/function-call');
var defineBuiltIn = require('../internals/define-built-in');
var setPrototypeOf = require('../internals/object-set-prototype-of');
var setToStringTag = require('../internals/set-to-string-tag');
var setSpecies = require('../internals/set-species');
var aCallable = require('../internals/a-callable');
var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var anInstance = require('../internals/an-instance');
var speciesConstructor = require('../internals/species-constructor');
var task = require('../internals/task').set;
var microtask = require('../internals/microtask');
var hostReportErrors = require('../internals/host-report-errors');
var perform = require('../internals/perform');
var Queue = require('../internals/queue');
var InternalStateModule = require('../internals/internal-state');
var NativePromiseConstructor = require('../internals/promise-native-constructor');
var PromiseConstructorDetection = require('../internals/promise-constructor-detection');
var newPromiseCapabilityModule = require('../internals/new-promise-capability');
var PROMISE = 'Promise';
var FORCED_PROMISE_CONSTRUCTOR = PromiseConstructorDetection.CONSTRUCTOR;
var NATIVE_PROMISE_REJECTION_EVENT = PromiseConstructorDetection.REJECTION_EVENT;
var NATIVE_PROMISE_SUBCLASSING = PromiseConstructorDetection.SUBCLASSING;
var getInternalPromiseState = InternalStateModule.getterFor(PROMISE);
var setInternalState = InternalStateModule.set;
var NativePromisePrototype = NativePromiseConstructor && NativePromiseConstructor.prototype;
var PromiseConstructor = NativePromiseConstructor;
var PromisePrototype = NativePromisePrototype;
var TypeError = global.TypeError;
var document = global.document;
var process = global.process;
var newPromiseCapability = newPromiseCapabilityModule.f;
var newGenericPromiseCapability = newPromiseCapability;
var DISPATCH_EVENT = !!(document && document.createEvent && global.dispatchEvent);
var UNHANDLED_REJECTION = 'unhandledrejection';
var REJECTION_HANDLED = 'rejectionhandled';
var PENDING = 0;
var FULFILLED = 1;
var REJECTED = 2;
var HANDLED = 1;
var UNHANDLED = 2;
var Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;
// helpers
var isThenable = function (it) {
var then;
return isObject(it) && isCallable(then = it.then) ? then : false;
};
var callReaction = function (reaction, state) {
var value = state.value;
var ok = state.state == FULFILLED;
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 (state.rejection === UNHANDLED) onHandleUnhandled(state);
state.rejection = HANDLED;
}
if (handler === true) result = value;
else {
if (domain) domain.enter();
result = handler(value); // can throw
if (domain) {
domain.exit();
exited = true;
}
}
if (result === reaction.promise) {
reject(TypeError('Promise-chain cycle'));
} else if (then = isThenable(result)) {
call(then, result, resolve, reject);
} else resolve(result);
} else reject(value);
} catch (error) {
if (domain && !exited) domain.exit();
reject(error);
}
};
var notify = function (state, isReject) {
if (state.notified) return;
state.notified = true;
microtask(function () {
var reactions = state.reactions;
var reaction;
while (reaction = reactions.get()) {
callReaction(reaction, state);
}
state.notified = false;
if (isReject && !state.rejection) onUnhandled(state);
});
};
var dispatchEvent = function (name, promise, reason) {
var event, handler;
if (DISPATCH_EVENT) {
event = document.createEvent('Event');
event.promise = promise;
event.reason = reason;
event.initEvent(name, false, true);
global.dispatchEvent(event);
} else event = { promise: promise, reason: reason };
if (!NATIVE_PROMISE_REJECTION_EVENT && (handler = global['on' + name])) handler(event);
else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
};
var onUnhandled = function (state) {
call(task, global, function () {
var promise = state.facade;
var value = state.value;
var IS_UNHANDLED = isUnhandled(state);
var result;
if (IS_UNHANDLED) {
result = perform(function () {
if (IS_NODE) {
process.emit('unhandledRejection', value, promise);
} else dispatchEvent(UNHANDLED_REJECTION, promise, value);
});
// Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
state.rejection = IS_NODE || isUnhandled(state) ? UNHANDLED : HANDLED;
if (result.error) throw result.value;
}
});
};
var isUnhandled = function (state) {
return state.rejection !== HANDLED && !state.parent;
};
var onHandleUnhandled = function (state) {
call(task, global, function () {
var promise = state.facade;
if (IS_NODE) {
process.emit('rejectionHandled', promise);
} else dispatchEvent(REJECTION_HANDLED, promise, state.value);
});
};
var bind = function (fn, state, unwrap) {
return function (value) {
fn(state, value, unwrap);
};
};
var internalReject = function (state, value, unwrap) {
if (state.done) return;
state.done = true;
if (unwrap) state = unwrap;
state.value = value;
state.state = REJECTED;
notify(state, true);
};
var internalResolve = function (state, value, unwrap) {
if (state.done) return;
state.done = true;
if (unwrap) state = unwrap;
try {
if (state.facade === value) throw TypeError("Promise can't be resolved itself");
var then = isThenable(value);
if (then) {
microtask(function () {
var wrapper = { done: false };
try {
call(then, value,
bind(internalResolve, wrapper, state),
bind(internalReject, wrapper, state)
);
} catch (error) {
internalReject(wrapper, error, state);
}
});
} else {
state.value = value;
state.state = FULFILLED;
notify(state, false);
}
} catch (error) {
internalReject({ done: false }, error, state);
}
};
// constructor polyfill
if (FORCED_PROMISE_CONSTRUCTOR) {
// 25.4.3.1 Promise(executor)
PromiseConstructor = function Promise(executor) {
anInstance(this, PromisePrototype);
aCallable(executor);
call(Internal, this);
var state = getInternalPromiseState(this);
try {
executor(bind(internalResolve, state), bind(internalReject, state));
} catch (error) {
internalReject(state, error);
}
};
PromisePrototype = PromiseConstructor.prototype;
// eslint-disable-next-line no-unused-vars -- required for `.length`
Internal = function Promise(executor) {
setInternalState(this, {
type: PROMISE,
done: false,
notified: false,
parent: false,
reactions: new Queue(),
rejection: false,
state: PENDING,
value: undefined
});
};
// `Promise.prototype.then` method
// https://tc39.es/ecma262/#sec-promise.prototype.then
Internal.prototype = defineBuiltIn(PromisePrototype, 'then', function then(onFulfilled, onRejected) {
var state = getInternalPromiseState(this);
var reaction = newPromiseCapability(speciesConstructor(this, PromiseConstructor));
state.parent = true;
reaction.ok = isCallable(onFulfilled) ? onFulfilled : true;
reaction.fail = isCallable(onRejected) && onRejected;
reaction.domain = IS_NODE ? process.domain : undefined;
if (state.state == PENDING) state.reactions.add(reaction);
else microtask(function () {
callReaction(reaction, state);
});
return reaction.promise;
});
OwnPromiseCapability = function () {
var promise = new Internal();
var state = getInternalPromiseState(promise);
this.promise = promise;
this.resolve = bind(internalResolve, state);
this.reject = bind(internalReject, state);
};
newPromiseCapabilityModule.f = newPromiseCapability = function (C) {
return C === PromiseConstructor || C === PromiseWrapper
? new OwnPromiseCapability(C)
: newGenericPromiseCapability(C);
};
if (!IS_PURE && isCallable(NativePromiseConstructor) && NativePromisePrototype !== Object.prototype) {
nativeThen = NativePromisePrototype.then;
if (!NATIVE_PROMISE_SUBCLASSING) {
// make `Promise#then` return a polyfilled `Promise` for native promise-based APIs
defineBuiltIn(NativePromisePrototype, 'then', function then(onFulfilled, onRejected) {
var that = this;
return new PromiseConstructor(function (resolve, reject) {
call(nativeThen, that, resolve, reject);
}).then(onFulfilled, onRejected);
// https://github.com/zloirock/core-js/issues/640
}, { unsafe: true });
}
// make `.constructor === Promise` work for native promise-based APIs
try {
delete NativePromisePrototype.constructor;
} catch (error) { /* empty */ }
// make `instanceof Promise` work for native promise-based APIs
if (setPrototypeOf) {
setPrototypeOf(NativePromisePrototype, PromisePrototype);
}
}
}
$({ global: true, constructor: true, wrap: true, forced: FORCED_PROMISE_CONSTRUCTOR }, {
Promise: PromiseConstructor
});
setToStringTag(PromiseConstructor, PROMISE, false, true);
setSpecies(PROMISE);
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