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make sure once callback is only called once

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This commit is contained in:
Martti Malmi 2023-09-09 21:18:04 +03:00
parent 6522c373ad
commit d7a7c752aa
1 changed files with 4 additions and 5 deletions
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9
src/js/state/Node.ts
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@ -226,14 +226,13 @@ export default class Node {
/**
* Same as on(), but will unsubscribe after the first callback
* @param callback
* @param unsubscribe
*/
once(callback?: Callback, returnIfUndefined = false, unsubscribe?: Unsubscribe): Promise<any> {
once(callback?: Callback, returnIfUndefined = false): Promise<any> {
return new Promise((resolve) => {
let resolved = false;
const cb = (value, updatedAt, path, unsub) => {
if (unsubscribe) {
unsubscribe();
}
if (resolved) return;
resolved = true;
resolve(value);
callback?.(value, updatedAt, path, () => {});
unsub();