22 lines
643 B
JavaScript
22 lines
643 B
JavaScript
// The source (has been changed) is https://github.com/facebook/react/issues/5465#issuecomment-157888325
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var CANCELATION_MESSAGE = {
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type: 'cancelation',
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msg: 'operation is manually canceled'
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};
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function makeCancelable(promise) {
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var hasCanceled_ = false;
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var wrappedPromise = new Promise(function (resolve, reject) {
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promise.then(function (val) {
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return hasCanceled_ ? reject(CANCELATION_MESSAGE) : resolve(val);
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});
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promise["catch"](reject);
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});
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return wrappedPromise.cancel = function () {
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return hasCanceled_ = true;
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}, wrappedPromise;
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}
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export default makeCancelable;
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export { CANCELATION_MESSAGE };
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