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Fix handle jest v27 fake timers (issue #30) #38

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Fix handle jest v27 fake timers (issue #30) #38

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5 changes: 4 additions & 1 deletion src/helpers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,9 +7,12 @@ const globalObj = typeof window === "undefined" ? global : window;

// Currently this fn only supports jest timers, but it could support other test runners in the future.
function runWithRealTimers(callback: () => any) {
// legacy jest timers mutate `global.setTimeout` differently to
// jest v27 fake timers; this checks hanldes both
const usingJestFakeTimers =
// eslint-disable-next-line no-underscore-dangle
(globalObj.setTimeout as any)._isMockFunction &&
((globalObj.setTimeout as any)._isMockFunction ||
(globalObj.setTimeout as any).clock) &&
typeof jest !== "undefined";

if (usingJestFakeTimers) {
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