Introduce type definitions for jest-expect-message (#34890)

* Introduce type definitions for jest-expect-message

* Fix review comment (remove declare global)

types/jest-expect-message/index.d.ts

@@ -0,0 +1,13 @@
+// Type definitions for jest-expect-message 1.0
+// Project: https://github.com/mattphillips/jest-expect-message#readme
+// Definitions by: Mike Davydov <https://github.com/mike-d-davydov>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.4
+
+/// <reference types="jest"/>
+
+declare namespace jest {
+    interface Expect {
+        <T = any>(actual: T, message: string): Matchers<T>;
+    }
+}

types/jest-expect-message/jest-expect-message-tests.ts

@@ -0,0 +1,6 @@
+import 'jest';
+import 'jest-expect-message';
+
+declare const expect: jest.Expect;
+
+expect(2, "Two is always two").toBe(2);

types/jest-expect-message/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": false,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "jest-expect-message-tests.ts"
+    ]
+}

types/jest-expect-message/tslint.json

@@ -0,0 +1,3 @@
+{ 
+    "extends": "dtslint/dt.json"
+}