feat(nanoscheduler): new type definition (#45878)

- definition file
- tests

https://www.npmjs.com/package/nanoscheduler
https://github.com/choojs/nanoscheduler#readme

Thanks!

types/nanoscheduler/index.d.ts

@@ -0,0 +1,27 @@
+// Type definitions for nanoscheduler 1.0
+// Project: https://github.com/choojs/nanoscheduler#readme
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Create a new scheduler instance.
+ * The instance is shared as a singleton on window (if available).
+ */
+declare function createScheduler(): scheduler.NanoScheduler;
+
+declare namespace scheduler {
+    /**
+     * Schedule work to be completed when the user agent is idle. Weighs 270 bytes compressed.
+     */
+    abstract class NanoScheduler {
+        constructor(hasWindow: boolean);
+        /**
+         * Push a callback into the scheduler, to be executed when the user agent is idle.
+         */
+        push(cb: () => void): void;
+        schedule(): void;
+        setTimeout(cb: () => void): void;
+    }
+}
+
+export = createScheduler;

types/nanoscheduler/nanoscheduler-tests.ts

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+/// <reference lib="DOM" />
+import NanoScheduler = require('nanoscheduler');
+
+const scheduler = NanoScheduler(); // $ExpectTYpe NanoScheduler
+scheduler.push(() => {
+    // callback
+});
+scheduler.schedule();
+scheduler.setTimeout(() => {
+    // done
+});
+
+// usage sample
+let i = 10000;
+while (i--) scheduler.push(() => console.log(`idle time! ${Date.now()}`));

types/nanoscheduler/tsconfig.json

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

types/nanoscheduler/tslint.json

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