Add blob-util typings (#16844)

* Add blob-util typings

Library author is not interested in maintaining Typescript typings. See nolanlawson/blob-util#26

* In blob-util typings, move Typescript version tag

Move the Typescript version tag to the bottom of the headers.

types/blob-util/blob-util-tests.ts

@@ -0,0 +1,17 @@
+import * as blobUtil from 'blob-util';
+
+const testBlob = new Blob(['abcd']);
+
+blobUtil.base64StringToBlob('abcd'); // $ExpectType Promise<Blob>
+blobUtil.createObjectURL(testBlob); // $ExpectType string
+blobUtil.imgSrcToBlob('test.jpg'); // $ExpectType Promise<Blob>
+blobUtil.createBlob(['abcd']); // $ExpectType Blob
+blobUtil.arrayBufferToBlob(new ArrayBuffer(0)); // $ExpectType Promise<Blob>
+blobUtil.binaryStringToBlob('0101'); // $ExpectType Promise<Blob>
+blobUtil.blobToArrayBuffer(testBlob); // $ExpectType Promise<ArrayBuffer>
+blobUtil.blobToBase64String(testBlob); // $ExpectType Promise<string>
+blobUtil.blobToBinaryString(testBlob); // $ExpectType Promise<string>
+blobUtil.canvasToBlob(new HTMLCanvasElement()); // $ExpectType Promise<Blob>
+blobUtil.dataURLToBlob('data:abcd'); // $ExpectType Promise<Blob>
+blobUtil.imgSrcToDataURL('test.jpg'); // $ExpectType Promise<string>
+blobUtil.revokeObjectURL('blob:example'); // $ExpectType void

types/blob-util/index.d.ts

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+// Type definitions for blob-util 1.2
+// Project: https://github.com/nolanlawson/blob-util#readme
+// Definitions by: Max Battcher <https://github.com/WorldMaker>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+export function createBlob(parts: any[], options?: { type: string }): Blob;
+export function createObjectURL(blob: Blob): string;
+export function revokeObjectURL(url: string): void;
+export function blobToBinaryString(blob: Blob): Promise<string>;
+export function binaryStringToBlob(binary: string, type?: string): Promise<Blob>;
+export function blobToBase64String(blob: Blob): Promise<string>;
+export function base64StringToBlob(base64: string, type?: string): Promise<Blob>;
+export function dataURLToBlob(dataURL: string): Promise<Blob>;
+export function imgSrcToDataURL(src: string, type?: string, crossOrigin?: string): Promise<string>;
+export function canvasToBlob(canvas: HTMLCanvasElement, type?: string): Promise<Blob>;
+export function imgSrcToBlob(src: string, type?: string, crossOrigin?: string): Promise<Blob>;
+export function arrayBufferToBlob(arrayBuff: ArrayBuffer, type?: string): Promise<Blob>;
+export function blobToArrayBuffer(blob: Blob): Promise<ArrayBuffer>;

types/blob-util/tsconfig.json

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

types/blob-util/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }