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
|
||
|
|
var CANCELATION_MESSAGE = {
|
||
|
|
type: 'cancelation',
|
||
|
|
msg: 'operation is manually canceled'
|
||
|
|
};
|
||
|
|
|
||
|
|
function makeCancelable(promise) {
|
||
|
|
var hasCanceled_ = false;
|
||
|
|
var wrappedPromise = new Promise(function (resolve, reject) {
|
||
|
|
promise.then(function (val) {
|
||
|
|
return hasCanceled_ ? reject(CANCELATION_MESSAGE) : resolve(val);
|
||
|
|
});
|
||
|
|
promise["catch"](reject);
|
||
|
|
});
|
||
|
|
return wrappedPromise.cancel = function () {
|
||
|
|
return hasCanceled_ = true;
|
||
|
|
}, wrappedPromise;
|
||
|
|
}
|
||
|
|
|
||
|
|
export default makeCancelable;
|
||
|
|
export { CANCELATION_MESSAGE };
|