Close #589 PR: Add TypeScript recipe.

Author: SamVerschueren

docs/recipes/typescript.md

@@ -0,0 +1,56 @@
+# TypeScript
+
+AVA comes bundled with a TypeScript definition file. This allows developers to leverage TypeScript for writing tests.
+
+## Setup
+
+First install the TypeScript compiler [tsc](https://github.com/Microsoft/TypeScript).
+
+```
+$ npm install --save-dev tsc
+```
+
+Create a [`tsconfig.json`](https://github.com/Microsoft/TypeScript/wiki/tsconfig.json) file. This file specifies the compiler options required to compile the project or the test file.
+
+```json
+{
+	"compilerOptions": {
+		"module": "commonjs",
+		"target": "es2015"
+	}
+}
+```
+
+Add a `test` script in the `package.json` file. It will compile the project first and then run AVA.
+
+```json
+{
+  "scripts": {
+    "test": "tsc && ava"
+  }
+}
+```
+
+
+## Add tests
+
+Create a `test.ts` file.
+
+```ts
+import test from 'ava';
+
+async function fn() {
+    return Promise.resolve('foo');
+}
+
+test(async (t) => {
+    t.is(await fn(), 'foo');
+});
+```
+
+
+## Execute the tests
+
+```
+$ npm test
+```

readme.md

@@ -699,7 +699,7 @@ AVA, not Ava or ava. Pronounced [`/ˈeɪvə/` ay-və](media/pronunciation.m4a?ra
 - [Endpoint testing](docs/recipes/endpoint-testing.md)
 - [When to use `t.plan()`](docs/recipes/when-to-use-plan.md)
 - [Browser testing](docs/recipes/browser-testing.md)
-
+- [TypeScript](docs/recipes/typescript.md)
 
 ## Support