chore: add typechecks for tests of expect-utils and jest-circus (#13387)

Author: mrazauskas

package.json

@@ -113,7 +113,7 @@
     "test": "yarn lint && yarn jest",
     "typecheck": "yarn typecheck:examples && yarn typecheck:tests",
     "typecheck:examples": "tsc -p examples/angular --noEmit && tsc -p examples/expect-extend --noEmit && tsc -p examples/typescript --noEmit",
-    "typecheck:tests": "tsc -b packages/{babel-jest,babel-plugin-jest-hoist,diff-sequences,expect}/src/__tests__",
+    "typecheck:tests": "tsc -b packages/{babel-jest,babel-plugin-jest-hoist,diff-sequences,expect,expect-utils,jest-circus}/src/__tests__",
     "verify-old-ts": "node ./scripts/verifyOldTs.mjs",
     "verify-pnp": "node ./scripts/verifyPnP.mjs",
     "watch": "yarn build:js && node ./scripts/watch.mjs",

packages/expect-utils/src/__tests__/isError.test.ts

@@ -16,7 +16,7 @@ import {isError} from '../utils';
 // Copied from https://github.com/graingert/angular.js/blob/a43574052e9775cbc1d7dd8a086752c979b0f020/test/AngularSpec.js#L1883
 describe('isError', () => {
   function testErrorFromDifferentContext(
-    createError: (win: Window) => Error | null,
+    createError: (win: Window | typeof globalThis) => Error | null,
   ) {
     const iframe = document.createElement('iframe');
     document.body.appendChild(iframe);
@@ -46,16 +46,19 @@ describe('isError', () => {
   });
 
   it('should detect errors from another context', () => {
-    testErrorFromDifferentContext(win => new win.Error());
+    testErrorFromDifferentContext(
+      win => new (win as typeof globalThis).Error(),
+    );
   });
 
   it('should detect DOMException errors from another context', () => {
     testErrorFromDifferentContext(win => {
       try {
         win.document.querySelectorAll('');
-      } catch (e: any) {
-        return e;
+      } catch (e) {
+        return e as Error;
       }
+
       return null;
     });
   });

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

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import {Circus} from '@jest/types';
+import type {Circus} from '@jest/types';
 
 const testEventHandler: Circus.EventHandler = (event, state) => {
   switch (event.name) {
@@ -59,4 +59,5 @@ const testEventHandler: Circus.EventHandler = (event, state) => {
     console.log(`unhandledErrors: ${String(state.unhandledErrors.length)}`);
   }
 };
+
 export default testEventHandler;

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

@@ -7,11 +7,12 @@
 
 import type {Global} from '@jest/types';
 
+// Aliases of `it` and `test` to avoid collision with global testing APIs.
 let circusIt: Global.It;
 let circusTest: Global.It;
 
 const aliasCircusIt = () => {
-  const {it, test} = require('../');
+  const {it, test} = require('../') as typeof import('../');
   circusIt = it;
   circusTest = test;
 };

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

@@ -7,14 +7,12 @@
 
 import type {Global} from '@jest/types';
 
+// Aliases of `it` and `test` to avoid collision with global testing APIs.
 let circusIt: Global.It;
 let circusTest: Global.It;
 
-// using jest-jasmine2's 'it' to test jest-circus's 'it'. Had to differentiate
-// the two with this alias.
-
 const aliasCircusIt = () => {
-  const {it, test} = require('../');
+  const {it, test} = require('../') as typeof import('../');
   circusIt = it;
   circusTest = test;
 };

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

@@ -7,13 +7,11 @@
 
 import type {Global} from '@jest/types';
 
+// Alias of `it` to avoid collision with global testing APIs.
 let circusIt: Global.It;
 
-// using jest-jasmine2's 'it' to test jest-circus's 'it'. Had to differentiate
-// the two with this alias.
-
 const aliasCircusIt = () => {
-  const {it} = require('../');
+  const {it} = require('../') as typeof import('../');
   circusIt = it;
 };
 

packages/jest-circus/src/__tests__/tsconfig.json

@@ -3,5 +3,6 @@
   "compilerOptions": {
     "rootDir": "../"
   },
-  "include": ["../**/*"]
+  "include": ["../**/*"],
+  "references": [{"path": "../../"}]
 }