Added initial types for react-gtm-module (#35620)

* Added types for react-gtm-module

* Fixed some tslint issues

types/react-gtm-module/index.d.ts

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+// Type definitions for react-gtm-module 2.0
+// Project: https://github.com/alinemorelli/react-gtm
+// Definitions by: Marc Veens <https://github.com/marcveens>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+declare const TagManager: {
+    dataLayer: (dataLayerArgs: DataLayerArgs) => void;
+    initialize: (tagManagerArgs: TagManagerArgs) => void;
+};
+
+export interface TagManagerArgs extends DataLayerArgs {
+    /**
+     * GTM id, must be something like GTM-000000.
+     */
+    gtmId: string;
+    /**
+     * Additional events such as 'gtm.start': new Date().getTime(),event:'gtm.js'.
+     */
+    events?: object;
+    /**
+     * Used to set environments.
+     */
+    auth?: string;
+    /**
+     * Used to set environments, something like env-00.
+     */
+    preview?: string;
+}
+
+export interface DataLayerArgs {
+    /**
+     * Object that contains all of the information that you want to pass to Google Tag Manager.
+     */
+    dataLayer?: object;
+    /**
+     * Custom name for dataLayer object.
+     */
+    dataLayerName?: string;
+}
+
+export default TagManager;

types/react-gtm-module/react-gtm-module-tests.tsx

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+import TagManager from 'react-gtm-module';
+
+TagManager.initialize({
+    gtmId: 'GTM-000000'
+});
+
+TagManager.initialize({
+    gtmId: 'GTM-000000',
+    events: {},
+    auth: '',
+    preview: '',
+    dataLayer: {},
+    dataLayerName: ''
+});
+
+TagManager.dataLayer({
+    dataLayer: {},
+    dataLayerName: ''
+});

types/react-gtm-module/tsconfig.json

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

types/react-gtm-module/tslint.json

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