Create types for react-native-rss-parser (#38960)

* feat(@types/react-native-rss-parser): Create types

* feat(@types/react-native-rss-parser): Add itunes prop

types/react-native-rss-parser/index.d.ts

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+// Type definitions for react-native-rss-parser 1.4
+// Project: https://github.com/jameslawler/react-native-rss-parser
+// Definitions by: Emiliano Leite <https://github.com/emilianoLeite>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.3
+
+export { };
+
+type Maybe<T> = T | undefined;
+
+export interface FeedItem {
+    id: string;
+    title: string;
+    links: Array<{
+        url: string;
+        rel: string;
+    }>;
+    description: string;
+    content: string;
+    authors: Array<Maybe<{ name: string }>>;
+    categories: Array<Maybe<{ name: string }>>;
+    published: string;
+    enclosures: Array<{
+        url: string;
+        length: string;
+        mimeType: string;
+    }>;
+    itunes: {
+        authors: Maybe<Array<{ name: string }>>;
+        block: Maybe<string>;
+        duration: string;
+        explicit: string;
+        image: Maybe<string>;
+        isClosedCaptioned: Maybe<string>;
+        order: Maybe<string>;
+        subtitle: string;
+        summary: Maybe<string>;
+    };
+}
+
+export interface Feed {
+    type: string;
+    title: string;
+    links: Array<{
+        url: string;
+        rel: string;
+    }>;
+    description: string;
+    language: string;
+    copyright: Maybe<string>;
+    authors: Array<Maybe<{ name: string }>>;
+    lastUpdated: string;
+    lastPublished: string;
+    categories: Array<Maybe<{ name: string }>>;
+    image: {
+        title: string;
+        description: Maybe<string>;
+        url: string;
+        height: Maybe<string>;
+        width: Maybe<string>;
+    };
+    itunes: {
+        authors: Array<{ name: string }>;
+        block: Maybe<string>;
+        categories: Array<{
+            name: string;
+            subCategories: Array<Maybe<{ name: string }>>;
+        }>;
+        complete: Maybe<string>;
+        explicit: string;
+        image: string;
+        newFeedUrl: Maybe<string>;
+        owner: {
+            name: string;
+            email: string;
+        };
+        subtitle: Maybe<string>;
+        summary: string;
+    };
+    items: FeedItem[];
+}
+
+export function parse(feedUrl: string): Promise<Feed>;

types/react-native-rss-parser/react-native-rss-parser-tests.ts

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+import { parse } from 'react-native-rss-parser';
+
+// -- Globals --
+declare const fetch: (url: string) => Promise<any>;
+declare const console: any;
+
+fetch('http://rss-url.com')
+    .then(response => response.text())
+    .then(parse)
+    .then(feed => {
+        feed.authors[0].name; // $ExpectError
+        feed.image.title.toUpperCase(); // $ExpectType string
+        feed.image.height.toUpperCase(); // $ExpectError
+
+        feed.items[0].id; // $ExpectType string
+        feed.items[0].authors.name; // $ExpectError
+    })
+    .catch(console.error);

types/react-native-rss-parser/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",
+        "react-native-rss-parser-tests.ts"
+    ]
+}

types/react-native-rss-parser/tslint.json

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