Add types for redux-cablecar (#38944)

* Add types for redux-cablecar

* Make payload for the perform function optional

types/redux-cablecar/index.d.ts

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+// Type definitions for redux-cablecar 3.0
+// Project: https://github.com/ndhays/redux-cablecar#readme
+// Definitions by: Christoph Flick <https://github.com/ChFlick>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+import { Action, Middleware, Store } from 'redux';
+
+export interface Options {
+    connected?: () => void;
+    disconnected?: () => void;
+    params?: object;
+    prefix?: string;
+    optimisticOnFail?: boolean;
+}
+
+export interface CableCar {
+    changeChannel: (channel: string, options?: Options) => void;
+    getChannel: () => string;
+    getParams: () => object;
+    perform: (method: string, payload?: any) => void;
+    send: (action: string) => void;
+}
+
+declare var middleware: Middleware & {
+    connect: (store: Store, channel: string, options?: Options) => CableCar;
+    setProvider: (actionCableProvider: string) => void;
+};
+
+export default middleware;

types/redux-cablecar/package.json

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+{
+    "private": true,
+    "dependencies": {
+        "redux": "^4.0.4"
+    }
+}

types/redux-cablecar/redux-cablecar-tests.ts

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+import cablecar, { Options } from 'redux-cablecar';
+import { applyMiddleware, createStore } from 'redux';
+
+const store = createStore(() => null, applyMiddleware(cablecar));
+
+cablecar.setProvider('testProvider');
+
+const car = cablecar.connect(store, 'testChannel');
+
+const options: Options = {
+    connected: () => { },
+    prefix: 'ASDF'
+};
+
+const anotherCar = cablecar.connect(store, 'secondeTestChannel', options);
+
+car.perform('activate', { data: 'something' });
+anotherCar.send('noice_action');

types/redux-cablecar/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",
+        "redux-cablecar-tests.ts"
+    ]
+}

types/redux-cablecar/tslint.json

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