add type definition for package: apex.js (#13796)

* add apex.js

* 4 spaces

* fix `implicitly has any type`

* match the style of tslint.json

* make `event` and `context` not optional

* avoid annotating the types of callbacks manually

apex.js/apex.js-tests.ts

@@ -0,0 +1,5 @@
+import λ from "apex.js";
+
+const handler = λ(event => {
+    console.log("Invoked with event " + JSON.stringify(event));
+});

apex.js/index.d.ts

@@ -0,0 +1,8 @@
+// Type definitions for apex.js 2.0
+// Project: https://github.com/apex/node-apex
+// Definitions by: Yoriki Yamaguchi <https://github.com/y13i>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="aws-lambda" />
+
+export default function λ(fn: (event: any, context: AWSLambda.Context) => any): (event: any, context: AWSLambda.Context, callback: AWSLambda.Callback) => void;

apex.js/tsconfig.json

@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "apex.js-tests.ts"
+    ]
+}

apex.js/tslint.json

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