20 lines
497 B
JavaScript
20 lines
497 B
JavaScript
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export default function makeCancelable(thenable) {
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let isCanceled = false;
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const promise = Promise.resolve(thenable).then(
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function(result) {
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if (isCanceled) throw Object.freeze({ isCanceled });
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return result;
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},
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function(error) {
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if (isCanceled) throw Object.freeze({ isCanceled, error });
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throw error;
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}
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);
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return Object.assign(Object.create(promise), {
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then: promise.then.bind(promise),
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cancel() {
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isCanceled = true;
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},
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});
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}
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