[react-google-maps-loader] Create type definitions (#25662)

types/react-google-maps-loader/index.d.ts

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+// Type definitions for react-google-maps-loader 4.2
+// Project: https://github.com/xuopled/react-google-maps-loader
+// Definitions by: Vasily Nesterov <https://github.com/vasilysn>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+/// <reference types="googlemaps" />
+import { Component, ReactNode } from "react";
+
+export default ReactGoogleMapsLoader;
+
+declare class ReactGoogleMapsLoader extends Component<
+    ReactGoogleMapsLoader.Props
+> {}
+
+declare namespace ReactGoogleMapsLoader {
+    type GoogleMaps = typeof google.maps;
+
+    interface Params {
+        key: string;
+        libraries?: string;
+    }
+
+    interface Props {
+        params: Params;
+        render: (googleMaps: GoogleMaps, error?: string | null) => ReactNode;
+    }
+}

types/react-google-maps-loader/react-google-maps-loader-tests.tsx

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+import * as React from "react";
+import ReactGoogleMapsLoader from "react-google-maps-loader";
+
+const ReactGoogleMapsLoaderTest: React.SFC = () => (
+    <ReactGoogleMapsLoader
+        params={{ key: "secret-key" }}
+        render={googleMaps => <div />}
+    />
+);
+
+const ReactGoogleMapsLoaderWithLibrariesTest: React.SFC = () => (
+    <ReactGoogleMapsLoader
+        params={{ key: "secret-key", libraries: "places" }}
+        render={googleMaps => <div />}
+    />
+);
+
+const ReactGoogleMapsLoaderWithErrorHandlerTest: React.SFC = () => (
+    <ReactGoogleMapsLoader
+        params={{ key: "secret-key", libraries: "places" }}
+        render={(googleMaps, error) => <div>{error}</div>}
+    />
+);

types/react-google-maps-loader/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "jsx": "react",
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-google-maps-loader-tests.tsx"
+    ]
+}

types/react-google-maps-loader/tslint.json

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