feat(tsc-watch): new type definition v4.2 (#43592)

- definition files
- tests

https://github.com/gilamran/tsc-watch

Thanks!

types/tsc-watch/client.d.ts

@@ -0,0 +1,3 @@
+import client = require('./lib/client');
+
+export = client;

types/tsc-watch/index.d.ts

@@ -0,0 +1,6 @@
+// Type definitions for tsc-watch 4.2
+// Project: https://github.com/gilamran/tsc-watch#readme
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export {};

types/tsc-watch/lib/client.d.ts

@@ -0,0 +1,25 @@
+/// <reference types="node" />
+
+import { EventEmitter } from 'events';
+
+declare class TscWatchClient extends EventEmitter {
+    start(...args: any[]): void;
+    kill(): void;
+
+    // tslint:disable:unified-signatures
+    /**
+     * Emitted upon first successful compilation
+     */
+    on(event: 'first_success', cb: () => any): this;
+    /**
+     * Emitted upon first successful compilation
+     */
+    on(event: 'success', cb: () => any): this;
+    /**
+     * Emitted upon every failing compilation
+     */
+    on(event: 'compile_errors', cb: () => any): this;
+    // tslint:enable:unified-signatures
+}
+
+export = TscWatchClient;

types/tsc-watch/tsc-watch-tests.ts

@@ -0,0 +1,22 @@
+import TscWatchClient = require('tsc-watch/client');
+const watch = new TscWatchClient();
+
+watch.on('first_success', () => {
+    console.log('First success!');
+});
+
+watch.on('success', () => {
+    // Your code goes here...
+});
+
+watch.on('compile_errors', () => {
+    // Your code goes here...
+});
+
+watch.start('--project', '.');
+
+try {
+    // do something...
+} catch (e) {
+    watch.kill(); // Fatal error, kill the compiler instance.
+}

types/tsc-watch/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "tsc-watch-tests.ts"
+    ]
+}

types/tsc-watch/tslint.json

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