Merge pull request #11899 from beckend/jest-it-callback-strictNullChecks-fix

[types-2.0] jest - It optional callback fix

jest/index.d.ts

@@ -91,7 +91,7 @@ declare namespace jest {
     }
 
     interface ProvidesCallback {
-        (cb?: DoneCallback): any;
+        (cb: DoneCallback): any;
     }
 
     interface Lifecycle {
@@ -99,7 +99,7 @@ declare namespace jest {
     }
 
     interface It {
-        (name: string, fn: ProvidesCallback): void;
+        (name: string, fn?: ProvidesCallback): void;
         only: It;
         skip: It;
         concurrent: It;

jest/jest-tests.ts

@@ -358,3 +358,12 @@ describe('genMockFromModule', function () {
       });
     });
 });
+
+/**
+ * Pass strictNullChecks
+ */
+describe('strictNullChecks', function () {
+    it('does not complain when using done callback', (done) => {
+        done();
+    })
+});

jest/tsconfig.json

@@ -3,7 +3,7 @@
         "module": "commonjs",
         "target": "es6",
         "noImplicitAny": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"