Add types for package redux-batched-subscribe (#18394)

* Add redux-batched-subscribe types

* Address lint errors

* Add tests for redux-batched-subscribe

* Add sample batchFunction and corresponding types

types/redux-batched-subscribe/index.d.ts

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+// Type definitions for redux-batched-subscribe 0.1
+// Project: https://github.com/tappleby/redux-batched-subscribe
+// Definitions by: Dibyo Majumdar <https://github.com/mDibyo>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import { GenericStoreEnhancer } from 'redux';
+
+export type NotifyFunction = () => void;
+export type BatchFunction = (notify: NotifyFunction) => void;
+
+export function batchedSubscribe(batch: BatchFunction): GenericStoreEnhancer;

types/redux-batched-subscribe/package.json

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+{
+    "dependencies": {
+        "redux": ">=1.0.0"
+    }
+}

types/redux-batched-subscribe/redux-batched-subscribe-tests.ts

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+import { createStore, Store, Reducer } from "redux";
+import { batchedSubscribe, BatchFunction, NotifyFunction } from 'redux-batched-subscribe';
+
+interface State {
+    [key: string]: any;
+}
+
+const rootReducer: Reducer<State> = () => ({});
+
+const asyncNotify: BatchFunction = (() => {
+    let notifying: boolean = false;
+
+    return (notify: NotifyFunction) => {
+        if (notifying) {
+            return;
+        }
+
+        notifying = true;
+        setTimeout(() => {
+            notify();
+            notifying = false;
+        });
+    };
+})();
+
+const store: Store<State> = createStore(
+    rootReducer,
+    undefined,
+    batchedSubscribe(asyncNotify)
+);

types/redux-batched-subscribe/tsconfig.json

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

types/redux-batched-subscribe/tslint.json

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+{ "extends": "dtslint/dt.json" }