Added types for socket.io-file package (#40119)

* Added types for socket.io-file package

* Added TypeScript Version comment

* Fixed formatting

* Fixed formatting errors

* Fixed formatting errors

types/socket.io-file/index.d.ts

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+// Type definitions for socket.io-file 2.0
+// Project: https://github.com/rico345100/socket.io-file
+// Definitions by: Dief Bell <https://github.com/merrickking>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import { Socket } from 'socket.io';
+
+export = SocketIOFile;
+
+declare class SocketIOFile {
+	constructor(socket: Socket, options: Options);
+	on(event: string, cb: (fileInfo: FileInfo) => void): void;
+}
+
+interface Options {
+	uploadDir: string | { [dirId: string]: string };
+	maxFileSize?: number;
+	accepts?: string[];
+	chunkSize?: number;
+	transmissionDelay?: number;
+	overwrite?: boolean;
+	rename?: (fileName: string, fileInfo: FileInfo) => string | string;
+	resume?: boolean;
+}
+
+interface FileInfo {
+	name: string;
+	size: number;
+	path: string;
+	wrote: number;
+	uploadDir: string;
+	data: any[];
+	mime: string;
+	estimated: number;
+	uploadId: string;
+	originalFileName: string;
+}

types/socket.io-file/socket.io-file-tests.ts

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+"use strict";
+import express = require('express');
+const app = express();
+import http = require('http');
+const httpServer = new http.Server(app);
+import io = require('socket.io');
+const socket = io(httpServer);
+import SocketIOFile = require('socket.io-file');
+
+app.get('/', (req, res, next) => {
+	res.sendFile(__dirname + '/client/index.html');
+	return;
+});
+
+app.get('/app.js', (req, res, next) => {
+	res.sendFile(__dirname + '/client/app.js');
+	return;
+});
+
+app.get('/socket.io.js', (req, res, next) => {
+	res.sendFile(__dirname + '/node_modules/socket.io-client/dist/socket.io.js');
+	return;
+});
+
+app.get('/socket.io-file-client.js', (req, res, next) => {
+	res.sendFile(__dirname + '/node_modules/socket.io-file-client/socket.io-file-client.js');
+	return;
+});
+
+socket.on('connection', (socket: io.Socket) => {
+	console.log('Socket connected.');
+
+	const uploader = new SocketIOFile(socket, {
+		// uploadDir: {			// multiple directories
+		// 	music: 'data/music',
+		// 	document: 'data/document'
+		// },
+		uploadDir: 'data',							// simple directory
+		accepts: ['audio/mpeg', 'audio/mp3'],		// chrome and some of browsers checking mp3 as 'audio/mp3', not 'audio/mpeg'
+		maxFileSize: 4194304, 						// 4 MB. default is undefined(no limit)
+		chunkSize: 10240,							// default is 10240(1KB)
+		transmissionDelay: 0,						// delay of each transmission, higher value saves more cpu resources, lower upload speed. default is 0(no delay)
+		overwrite: true 							// overwrite file if exists, default is true.
+	});
+	uploader.on('start', (fileInfo) => {
+		console.log('Start uploading');
+		console.log(fileInfo);
+	});
+	uploader.on('stream', (fileInfo) => {
+		console.log(`${fileInfo.wrote} / ${fileInfo.size} byte(s)`);
+	});
+	uploader.on('complete', (fileInfo) => {
+		console.log('Upload Complete.');
+		console.log(fileInfo);
+	});
+	uploader.on('error', (err) => {
+		console.log('Error!', err);
+	});
+	uploader.on('abort', (fileInfo) => {
+		console.log('Aborted: ', fileInfo);
+	});
+});
+
+httpServer.listen(3000, () => {
+	console.log('Server listening on port 3000');
+});

types/socket.io-file/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",
+        "socket.io-file-tests.ts"
+    ]
+}

types/socket.io-file/tslint.json

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