add jest-matchers (#17040)

types/jest-matchers/index.d.ts

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+// Type definitions for jest-matchers 20.0
+// Project: https://github.com/facebook/jest#readme
+// Definitions by: Joscha Feth <https://github.com/joscha>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="jest" />
+export = expect;

types/jest-matchers/jest-matchers-tests.ts

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+import * as expect from 'jest-matchers';
+
+expect('x').toEqual('x');

types/jest-matchers/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "jest-matchers-tests.ts"
+    ]
+}

types/jest-matchers/tslint.json

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