Added types for react-native-pdf-lib (#37314)

* Added types for react-native-pdf-lib.

* Making linter happy with default export.

types/react-native-pdf-lib/index.d.ts

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+// Type definitions for react-native-pdf-lib 0.2
+// Project: https://github.com/Hopding/react-native-pdf-lib#readme
+// Definitions by: Kevin Brown <https://github.com/thekevinbrown>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare let PDFLib: {
+    getDocumentsDirectory(): string;
+};
+
+export default PDFLib;
+
+export class PDFDocument {
+    static create(path: string): PDFDocument;
+
+    addPages(pages: PDFPage[]): PDFDocument;
+
+    /* Saves the document and returns the path to the file it wrote */
+    write(): Promise<string>;
+}
+
+export interface SetMediaBoxOptions {
+    x?: number;
+    y?: number;
+}
+
+export interface TextDrawingOptions {
+    x?: number;
+    y?: number;
+    color?: string;
+    fontName?: string;
+    fontSize?: number;
+}
+
+export interface RectangleDrawingOptions {
+    x?: number;
+    y?: number;
+    width?: number;
+    height?: number;
+    color?: string;
+}
+
+export interface ImageDrawingOptions {
+    x?: number;
+    y?: number;
+    width?: number;
+    height?: number;
+}
+
+export class PDFPage {
+    static create(): PDFPage;
+
+    setMediaBox(width: number, height: number, options?: SetMediaBoxOptions): PDFPage;
+
+    drawText(text: string, options?: TextDrawingOptions): PDFPage;
+    drawRectangle(options?: RectangleDrawingOptions): PDFPage;
+    drawImage(imageUri: string, options?: ImageDrawingOptions): PDFPage;
+}

types/react-native-pdf-lib/react-native-pdf-lib-tests.ts

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+import PDFLib, { PDFDocument, PDFPage } from 'react-native-pdf-lib';
+
+PDFLib.getDocumentsDirectory(); // $ExpectType string
+
+// Document Tests
+PDFDocument.create('/some/path'); // $ExpectType PDFDocument
+
+const document = PDFDocument.create('/some/path');
+document.addPages([PDFPage.create()]); // $ExpectType PDFDocument
+document.write(); // $ExpectType Promise<string>
+
+// Page Tests
+PDFPage.create(); // $ExpectType PDFPage
+
+const page = PDFPage.create();
+page.setMediaBox(10, 10); // $ExpectType PDFPage
+page.setMediaBox(10, 10, { x: 10, y: 10 }); // $ExpectType PDFPage
+
+page.drawRectangle(); // $ExpectType PDFPage
+page.drawRectangle({}); // $ExpectType PDFPage
+page.drawRectangle({ x: 10, y: 10, width: 10, height: 10, color: '#fff' }); // $ExpectType PDFPage
+
+page.drawImage('ph:/some/uri'); // $ExpectType PDFPage
+page.drawImage('ph:/some/uri', {}); // $ExpectType PDFPage
+page.drawImage('ph:/some/uri', { x: 10, y: 10, width: 10, height: 10 }); // $ExpectType PDFPage
+
+page.drawText('Some string'); // $ExpectType PDFPage
+page.drawText('Some string', {}); // $ExpectType PDFPage
+page.drawText('Some string', { x: 10, y: 10, color: '#fff', fontName: 'TimesNewRoman', fontSize: 10 }); // $ExpectType PDFPage

types/react-native-pdf-lib/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-pdf-lib-tests.ts"
+    ]
+}

types/react-native-pdf-lib/tslint.json

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