feat(download): Add download types

types/download/download-tests.ts

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+import * as fs from 'fs';
+import download = require('download');
+
+download('http://unicorn.com/foo.jpg', 'dist').then(() => {
+	console.log('done!');
+});
+
+download('http://unicorn.com/foo.jpg').then(data => {
+	fs.writeFileSync('dist/foo.jpg', data);
+});
+
+download('unicorn.com/foo.jpg').pipe(fs.createWriteStream('dist/foo.jpg'));
+
+download('unicorn.com/foo.jpg', 'dest', {
+	body: '',
+	decompress: true,
+	encoding: 'utf8',
+	extract: true,
+	filename: 'filename',
+	followRedirect: true,
+	proxy: '',
+	query: '',
+	retries: (retry: number, error: any) => 4,
+	timeout: {
+		connect: 20,
+		request: 20,
+		socket: 20
+	},
+	useElectronNet: true
+});

types/download/index.d.ts

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+// Type definitions for download 6.2
+// Project: https://github.com/kevva/download
+// Definitions by: Nico Jansen <https://github.com/nicojs>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+/// <reference types="node" />
+
+interface TimeoutOptions {
+    connect?: number;
+    socket?: number;
+    request?: number;
+}
+type RetryFunction = (retry: number, error: any) => number;
+
+interface DownloadOptions {
+    body?: string | Buffer | NodeJS.ReadableStream;
+    encoding?: string | null;
+    query?: string | object;
+    timeout?: number | TimeoutOptions;
+    retries?: number | RetryFunction;
+    followRedirect?: boolean;
+    decompress?: boolean;
+    useElectronNet?: boolean;
+    /**
+     * If set to true, try extracting the file using decompress.
+     */
+    extract?: boolean;
+    /**
+     * Name of the saved file.
+     */
+    filename?: string;
+    /**
+     * Proxy endpoint
+     */
+    proxy?: string;
+}
+
+declare function download(url: string, destination?: string, options?: DownloadOptions): Promise<Buffer> & NodeJS.WritableStream & NodeJS.ReadableStream;
+
+export = download;

types/download/tsconfig.json

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

types/download/tslint.json

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