Add definitions and tests for gulp-concat

gulp-concat/gulp-concat-tests.ts

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+/// <reference path="./gulp-concat.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+import gulp = require("gulp");
+import concat = require("gulp-concat");
+
+gulp.task("concat:simple", () => {
+    gulp.src(["file*.txt"])
+        .pipe(concat("file.txt"))
+        .pipe(gulp.dest("build"));
+});
+
+gulp.task("concat:newLine", () => {
+    gulp.src(["file*.txt"])
+        .pipe(concat("file.txt", { newLine: ";" }))
+        .pipe(gulp.dest("build"));
+});
+
+gulp.task("concat:vinyl", () => {
+    gulp.src(["file*.txt"])
+        .pipe(concat({ path: "file.txt", stat: { mode: 0666 } }))
+        .pipe(gulp.dest("build"));
+});

gulp-concat/gulp-concat.d.ts

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+// Type definitions for gulp-concat
+// Project: http://github.com/wearefractal/gulp-concat
+// Definitions by: Keita Kagurazaka <https://github.com/k-kagurazaka>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "gulp-concat" {
+
+    interface IOptions {
+        newLine: string;
+    }
+
+    interface IFsStats {
+        dev?: number;
+        ino?: number;
+        mode?: number;
+        nlink?: number;
+        uid?: number;
+        gid?: number;
+        rdev?: number;
+        size?: number;
+        blksize?: number;
+        blocks?: number;
+        atime?: Date;
+        mtime?: Date;
+        ctime?: Date;
+    }
+
+    interface IVinylOptions {
+        cwd?: string;
+        base?: string;
+        path?: string;
+        stat?: IFsStats;
+        contents?: NodeJS.ReadableStream | Buffer;
+    }
+
+    function concat(filename: string, options?: IOptions): NodeJS.ReadWriteStream;
+    function concat(options: IVinylOptions): NodeJS.ReadWriteStream;
+
+    export = concat;
+}