feat(jest): Add ./global-types as an alias to ./index

types/jest/global-types.d.ts

@@ -0,0 +1,11 @@
+// Starting from jest v24.3.0, the jest package provides its own type definition.
+// @types/jest now serves a different purpose than that;
+// it declares global variables injeced by jest, rather than jest's own API.
+//
+// Unfortunately, that led to `types: ["jest"]` being resolved to the jest package,
+// causing problems when `typeRoots` is configured.
+//
+// This file enables users to specify `types: ["jest/global-types"]` in tsconfig.json
+// to clarify their intention.
+
+/// <reference path="./index.d.ts" />

types/jest/test/global-types-tests.ts

@@ -0,0 +1,5 @@
+/// <reference path="../global-types.d.ts" />
+
+describe("42", () => {
+  expect(42).toBe(42);
+});

types/jest/tsconfig.json

@@ -17,6 +17,8 @@
     },
     "files": [
         "index.d.ts",
-        "jest-tests.ts"
+        "global-types.d.ts",
+        "jest-tests.ts",
+        "test/global-types-tests.ts"
     ]
 }

types/jest/tslint.json

@@ -1 +1,6 @@
-{ "extends": "dtslint/dt.json" }
+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "no-bad-reference": false
+    }
+}