mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-24 17:35:16 +00:00
39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
|
"use strict";
|
||
|
|
function noop() { }
|
||
|
|
function once(emitter, name) {
|
||
|
|
const o = once.spread(emitter, name);
|
||
|
|
const r = o.then((args) => args[0]);
|
||
|
|
r.cancel = o.cancel;
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
(function (once) {
|
||
|
|
function spread(emitter, name) {
|
||
|
|
let c = null;
|
||
|
|
const p = new Promise((resolve, reject) => {
|
||
|
|
function cancel() {
|
||
|
|
emitter.removeListener(name, onEvent);
|
||
|
|
emitter.removeListener('error', onError);
|
||
|
|
p.cancel = noop;
|
||
|
|
}
|
||
|
|
function onEvent(...args) {
|
||
|
|
cancel();
|
||
|
|
resolve(args);
|
||
|
|
}
|
||
|
|
function onError(err) {
|
||
|
|
cancel();
|
||
|
|
reject(err);
|
||
|
|
}
|
||
|
|
c = cancel;
|
||
|
|
emitter.on(name, onEvent);
|
||
|
|
emitter.on('error', onError);
|
||
|
|
});
|
||
|
|
if (!c) {
|
||
|
|
throw new TypeError('Could not get `cancel()` function');
|
||
|
|
}
|
||
|
|
p.cancel = c;
|
||
|
|
return p;
|
||
|
|
}
|
||
|
|
once.spread = spread;
|
||
|
|
})(once || (once = {}));
|
||
|
|
module.exports = once;
|
||
|
|
//# sourceMappingURL=index.js.map
|