Add type definitions of express-fileupload (#18641)

* Add type definitions of express-fileupload

* Fixed all lint errors

types/express-fileupload/express-fileupload-tests.ts

@@ -0,0 +1,29 @@
+import * as express from 'express';
+import { RequestHandler, Request, Response, NextFunction } from 'express-serve-static-core';
+import { fileUpload, UploadedFile } from 'express-fileupload';
+
+const app: express.Express = express();
+
+app.use(fileUpload({debug: true}));
+
+function isUploadedFile(file: UploadedFile | UploadedFile[]): file is UploadedFile {
+    return typeof file === 'object' && (<UploadedFile> file).name !== undefined;
+}
+
+const uploadHandler: RequestHandler = (req: Request, res: Response, next: NextFunction) => {
+    if (typeof req.files === 'object') {
+        const fileField = req.files.field;
+        if (isUploadedFile(fileField)) {
+            console.log(fileField.name);
+        }
+
+        const fileList = req.files.fileList;
+        if (Array.isArray(fileList)) {
+            for (const file of fileList) {
+                console.log(file.name);
+            }
+        }
+    }
+};
+
+app.post('/upload', uploadHandler);

types/express-fileupload/index.d.ts

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+// Type definitions for express-fileupload 0.1
+// Project: https://github.com/richardgirges/express-fileupload#readme
+// Definitions by: Gintautas Miselis <https://github.com/Naktibalda>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import express = require('express');
+
+declare global {
+    namespace Express {
+        interface Request {
+            files?: FileArray;
+        }
+    }
+}
+
+export class FileArray {
+    [index: string]: UploadedFile | UploadedFile[]
+}
+
+export interface UploadedFile {
+    name: string;
+    encoding: string;
+    mimetype: string;
+    data: Buffer;
+    mv(path: string, callback: (err: any) => {}): void;
+}
+
+export interface Options {
+    debug?: boolean;
+    safeFileNames?: boolean;
+    preserveExtension?: boolean | string | number;
+    [property: string]: any;
+}
+
+export function fileUpload(options?: Options): express.RequestHandler;

types/express-fileupload/tsconfig.json

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

types/express-fileupload/tslint.json

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