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refactor(fake-timers): don't setup fakeTimerAPIs unless needed #10551

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3 changes: 1 addition & 2 deletions packages/jest-fake-timers/src/legacyFakeTimers.ts
Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,6 @@ export default class FakeTimers<TimerRef> {
};

this.reset();
this._createMocks();
}

clearAllTimers(): void {
Expand Down Expand Up @@ -349,7 +348,7 @@ export default class FakeTimers<TimerRef> {
}

private _checkFakeTimers() {
if (this._global.setTimeout !== this._fakeTimerAPIs.setTimeout) {
if (this._global.setTimeout !== this._fakeTimerAPIs?.setTimeout) {
this._global.console.warn(
`A function to advance timers was called but the timers API is not ` +
`mocked with fake timers. Call \`jest.useFakeTimers()\` in this ` +
Expand Down