Add working Jest & TypeScript config

- Jest now uses ts-jest for transforms
- TypeScript compilation via `lerna run tsc`

__tests__/github.test.js

@@ -1,9 +0,0 @@
-'use strict';
-
-// const github = require('..');
-
-describe('@actions/github', () => {
-  it('needs tests', () => {
-
-  });
-});

__tests__/github.test.ts

@@ -0,0 +1,7 @@
+import { github } from '../src/github';
+
+describe('@actions/github', () => {
+  it('needs tests', () => {
+      expect(github()).toBe(true)
+  });
+});

lib/github.js

@@ -1,7 +0,0 @@
-'use strict';
-
-module.exports = github;
-
-function github() {
-    // TODO
-}

package.json

@@ -24,7 +24,8 @@
     "url": "git+https://github.com/actions/toolkit.git"
   },
   "scripts": {
-    "test": "echo \"Error: run tests from root\" && exit 1"
+    "test": "echo \"Error: run tests from root\" && exit 1",
+    "tsc": "tsc"
   },
   "bugs": {
     "url": "https://github.com/actions/toolkit/issues"

src/github.ts

@@ -0,0 +1,3 @@
+export function github() {
+  return true
+}

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "baseUrl": "./",
+    "outDir": "./lib",
+    "rootDir": "./src"
+  },
+  "include": [
+    "./src"
+  ]
+}