simplify check

jestjs · Oct 15, 2021 · e4b2867 · e4b2867
1 parent f1602d0
commit e4b2867
Showing 1 changed file with 3 additions and 9 deletions.
diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts
@@ -1963,7 +1963,7 @@ export default class Runtime {
       getRealSystemTime: () => {
         const fakeTimers = _getFakeTimers();
 
-        if (this._areModernFakeTimers(fakeTimers)) {
+        if (fakeTimers === this._environment.fakeTimersModern) {
           return fakeTimers.getRealSystemTime();
         } else {
           throw new TypeError(
@@ -1984,7 +1984,7 @@ export default class Runtime {
       runAllImmediates: () => {
         const fakeTimers = _getFakeTimers();
 
-        if (!this._areModernFakeTimers(fakeTimers)) {
+        if (fakeTimers === this._environment.fakeTimers) {
           fakeTimers.runAllImmediates();
         } else {
           throw new TypeError(
@@ -2000,7 +2000,7 @@ export default class Runtime {
       setSystemTime: (now?: number | Date) => {
         const fakeTimers = _getFakeTimers();
 
-        if (this._areModernFakeTimers(fakeTimers)) {
+        if (fakeTimers === this._environment.fakeTimersModern) {
           fakeTimers.setSystemTime(now);
         } else {
           throw new TypeError(
@@ -2018,12 +2018,6 @@ export default class Runtime {
     return jestObject;
   }
 
-  private _areModernFakeTimers(
-    fakeTimers: ModernFakeTimers | LegacyFakeTimers<unknown>,
-  ): fakeTimers is ModernFakeTimers {
-    return typeof (fakeTimers as ModernFakeTimers).setSystemTime === 'function';
-  }
-
   private _logFormattedReferenceError(errorMessage: string) {
     const testPath = this._testPath
       ? ` From ${slash(path.relative(this._config.rootDir, this._testPath))}.`