Add types for draftjs-to-html (#38588)

* Add types for draftjs-to-html

* Add types for draftjs-to-html: remove excess blank line

* Add types for draftjs-to-html: change function export

types/draftjs-to-html/draftjs-to-html-tests.ts

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+import draftToHtml from 'draftjs-to-html';
+
+const editorContent = {
+  blocks: [
+    {
+      key: '355iu',
+      text: 'test',
+      type: 'unstyled',
+      depth: 0,
+      inlineStyleRanges: [],
+      entityRanges: [],
+      data: {
+        'text-align': 'center',
+      },
+    },
+  ],
+  entityMap: {},
+};
+
+// $ExpectType string
+draftToHtml(editorContent);

types/draftjs-to-html/index.d.ts

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+// Type definitions for draftjs-to-html 0.8
+// Project: https://github.com/jpuri/draftjs-to-html#readme
+// Definitions by: Ivan Zverev <https://github.com/1cheese>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.9
+
+import { RawDraftContentState } from 'draft-js';
+
+interface HashtagConfig {
+    trigger?: string;
+    separator?: string;
+}
+
+declare function draftToHtml(
+    editorContent: RawDraftContentState,
+    hashtagConfig?: HashtagConfig,
+    directional?: boolean,
+    customEntityTransform?: (...args: any[]) => any,
+): string;
+
+export = draftToHtml;

types/draftjs-to-html/tsconfig.json

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

types/draftjs-to-html/tslint.json

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