Added typings for the package markdown-draft-js (#43041)

types/markdown-draft-js/index.d.ts

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+// Type definitions for markdown-draft-js 2.2
+// Project: https://github.com/Rosey/markdown-draft-js#readme
+// Definitions by: Yuri Drabik <https://github.com/yurist38>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+import { RawDraftContentState } from 'draft-js';
+
+export function markdownToDraft(markdown: string): RawDraftContentState;
+
+export function draftToMarkdown(RawDraft: RawDraftContentState): string;

types/markdown-draft-js/markdown-draft-js-tests.ts

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+import { EditorState, convertToRaw, convertFromRaw } from 'draft-js';
+import { draftToMarkdown, markdownToDraft } from 'markdown-draft-js';
+
+const rawContent = convertToRaw(EditorState.createEmpty().getCurrentContent());
+draftToMarkdown(rawContent);
+
+const rawDraft = markdownToDraft('# Test');
+convertFromRaw(rawDraft);

types/markdown-draft-js/tsconfig.json

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

types/markdown-draft-js/tslint.json

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