Some tweaks

packages/jest-circus/src/__mocks__/testUtils.ts

@@ -14,7 +14,7 @@ import {sync as spawnSync, ExecaReturns} from 'execa';
 // @ts-ignore
 import {skipSuiteOnWindows} from '../../../../scripts/ConditionalTest';
 
-const CIRCUS_PATH = require.resolve('../../build/index');
+const CIRCUS_PATH = require.resolve('../../build');
 const CIRCUS_RUN_PATH = require.resolve('../../build/run');
 const CIRCUS_STATE_PATH = require.resolve('../../build/state');
 const TEST_EVENT_HANDLER_PATH = require.resolve('./testEventHandler');

packages/jest-circus/src/__tests__/circusItTodoTestError.test.ts

@@ -11,7 +11,7 @@ let circusIt;
 // the two with this alias.
 
 const aliasCircusIt = () => {
-  const {it} = require('../index.ts');
+  const {it} = require('../');
   circusIt = it;
 };
 

packages/jest-circus/src/eventHandler.ts

@@ -167,7 +167,7 @@ const eventHandler: EventHandler = (event, state): void => {
       // i'm not sure if this is works. For now i just replicated whatever
       // jasmine was doing -- dabramov
       state.parentProcess = event.parentProcess;
-      invariant(state.parentProcess, '');
+      invariant(state.parentProcess);
       state.originalGlobalErrorHandlers = injectGlobalErrorHandlers(
         state.parentProcess,
       );
@@ -177,8 +177,8 @@ const eventHandler: EventHandler = (event, state): void => {
       break;
     }
     case 'teardown': {
-      invariant(state.originalGlobalErrorHandlers, '');
-      invariant(state.parentProcess, '');
+      invariant(state.originalGlobalErrorHandlers);
+      invariant(state.parentProcess);
       restoreGlobalErrorHandlers(
         state.parentProcess!,
         state.originalGlobalErrorHandlers!,

packages/jest-circus/src/utils.ts

@@ -62,7 +62,7 @@ export const makeTest = (
   timeout: number | null | undefined,
   asyncError: Exception,
 ): TestEntry => {
-  const errors: Array<[Exception | null | undefined, Exception]> = [];
+  const errors: Array<[Exception | undefined, Exception]> = [];
 
   return {
     asyncError,
@@ -361,7 +361,7 @@ export const addErrorToEachTestUnderDescribe = (
   }
 };
 
-export const invariant = (condition: unknown, message: string) => {
+export const invariant = (condition: unknown, message?: string) => {
   if (!condition) {
     throw new Error(message);
   }