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fix: debounceTime with asapScheduler deadlock because of nested calls #7207

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fix: debounceTime with asapScheduler deadlock because of nested calls #7207

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14 changes: 9 additions & 5 deletions src/internal/scheduler/AsapScheduler.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,15 @@ import { AsyncScheduler } from './AsyncScheduler';
export class AsapScheduler extends AsyncScheduler {
public flush(action?: AsyncAction<any>): void {
this._active = true;

const { actions } = this;
let error: any;
action = action || actions.shift()!;
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Suggested change
action = action || actions.shift()!;
action = action ?? actions.shift()!;


// The async id that effects a call to flush is stored in _scheduled.
// But in case of nested asyncScheduler calls _scheduled could be cleared,
// so we take flushId from the first action to guarantee execution of all
// actions with the same id.
// Before executing an action, it's necessary to check the action's async
// id to determine whether it's supposed to be executed in the current
// flush.
Expand All @@ -13,13 +21,9 @@ export class AsapScheduler extends AsyncScheduler {
// are removed from the actions array and that can shift actions that are
// scheduled to be executed in a subsequent flush into positions at which
// they are executed within the current flush.
const flushId = this._scheduled;
const flushId = this._scheduled ?? action.id;
this._scheduled = undefined;

const { actions } = this;
let error: any;
action = action || actions.shift()!;

do {
if ((error = action.execute(action.state, action.delay))) {
break;
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