abort-controller-x
Version:
Abortable async function helpers
61 lines • 1.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.execute = void 0;
const AbortError_1 = require("./AbortError");
/**
* Similar to `new Promise(executor)`, but allows executor to return abort
* callback that is called once `signal` is aborted.
*
* Returned promise rejects with `AbortError` once `signal` is aborted.
*
* Callback can return a promise, e.g. for doing any async cleanup. In this
* case, the promise returned from `execute` rejects with `AbortError` after
* that promise fulfills.
*/
function execute(signal, executor) {
return new Promise((resolve, reject) => {
if (signal.aborted) {
reject(new AbortError_1.AbortError());
return;
}
let removeAbortListener;
let finished = false;
function finish() {
if (!finished) {
finished = true;
if (removeAbortListener != null) {
removeAbortListener();
}
}
}
const callback = executor(value => {
resolve(value);
finish();
}, reason => {
reject(reason);
finish();
});
if (!finished) {
const listener = () => {
const callbackResult = callback();
if (callbackResult == null) {
reject(new AbortError_1.AbortError());
}
else {
callbackResult.then(() => {
reject(new AbortError_1.AbortError());
}, reason => {
reject(reason);
});
}
finish();
};
signal.addEventListener('abort', listener);
removeAbortListener = () => {
signal.removeEventListener('abort', listener);
};
}
});
}
exports.execute = execute;
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