fix: test.each type always return a callable function

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Features
 
 - `[jest-circus, jest-config, jest-runtime]` Add new `injectGlobals` config and CLI option to disable injecting global variables into the runtime ([#10484](https://github.com/facebook/jest/pull/10484))
+- `[jest-each]` Fixes `.each` type to always be callable ([#10447](https://github.com/facebook/jest/pull/10447))
 
 ### Fixes
 

packages/jest-jasmine2/src/jasmineAsyncInstall.ts

@@ -192,7 +192,7 @@ function makeConcurrent(
     return spec;
   };
   // each is binded after the function is made concurrent, so for now it is made noop
-  concurrentFn.each = () => {};
+  concurrentFn.each = () => () => {};
   return concurrentFn;
 }
 

packages/jest-types/src/Global.ts

@@ -45,7 +45,7 @@ type Each<EachCallback extends TestCallback> =
       test: EachTestFn<EachCallback>,
       timeout?: number,
     ) => void)
-  | (() => void);
+  | (() => () => void);
 
 export interface ItBase {
   (testName: TestName, fn: TestFn, timeout?: number): void;