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https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
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46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
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if (typeof Promise !== 'function') {
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throw new TypeError('A global Promise is required');
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}
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if (typeof Promise.prototype.finally !== 'function') {
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var speciesConstructor = function (O, defaultConstructor) {
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if (!O || (typeof O !== 'object' && typeof O !== 'function')) {
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throw new TypeError('Assertion failed: Type(O) is not Object');
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}
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var C = O.constructor;
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if (typeof C === 'undefined') {
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return defaultConstructor;
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}
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if (!C || (typeof C !== 'object' && typeof C !== 'function')) {
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throw new TypeError('O.constructor is not an Object');
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}
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var S = typeof Symbol === 'function' && typeof Symbol.species === 'symbol' ? C[Symbol.species] : undefined;
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if (S == null) {
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return defaultConstructor;
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}
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if (typeof S === 'function' && S.prototype) {
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return S;
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}
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throw new TypeError('no constructor found');
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};
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var shim = {
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finally(onFinally) {
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var promise = this;
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if (typeof promise !== 'object' || promise === null) {
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throw new TypeError('"this" value is not an Object');
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}
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var C = speciesConstructor(promise, Promise); // throws if SpeciesConstructor throws
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if (typeof onFinally !== 'function') {
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return Promise.prototype.then.call(promise, onFinally, onFinally);
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}
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return Promise.prototype.then.call(
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promise,
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x => new C(resolve => resolve(onFinally())).then(() => x),
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e => new C(resolve => resolve(onFinally())).then(() => { throw e; })
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);
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}
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};
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Object.defineProperty(Promise.prototype, 'finally', { configurable: true, writable: true, value: shim.finally });
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}
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