Add definitions for gulp-filter (https://github.com/sindresorhus/gulp-filter)

gulp-filter/gulp-filter-tests.ts

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+/// <reference path="gulp-filter.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+/// <reference path="../gulp-uglify/gulp-uglify.d.ts" />
+/// <reference path="../gulp-less/gulp-less.d.ts" />
+/// <reference path="../gulp-concat/gulp-concat.d.ts" />
+
+import * as gulp from 'gulp';
+import * as uglify from 'gulp-uglify';
+import * as less from 'gulp-less';
+import * as concat from 'gulp-concat';
+import * as filter from 'gulp-filter';
+
+// Filter only
+gulp.task('default', () => {
+    // create filter instance inside task function
+    const f = filter(['*', '!src/vendor']);
+
+    return gulp.src('src/*.js')
+        // filter a subset of the files
+        .pipe(f)
+        // run them through a plugin
+        .pipe(uglify())
+        .pipe(gulp.dest('dist'));
+});
+
+// Restoring filtered files
+gulp.task('default', () => {
+    // create filter instance inside task function
+    const f = filter(['*', '!src/vendor'], {restore: true});
+
+    return gulp.src('src/*.js')
+        // filter a subset of the files
+        .pipe(f)
+        // run them through a plugin
+        .pipe(uglify())
+        // bring back the previously filtered out files (optional)
+        .pipe(f.restore)
+        .pipe(gulp.dest('dist'));
+});
+
+// Multiple filters
+gulp.task('default', () => {
+    const jsFilter = filter('**/*.js', {restore: true});
+    const lessFilter = filter('**/*.less', {restore: true});
+
+    return gulp.src('assets/**')
+        .pipe(jsFilter)
+        .pipe(concat('bundle.js'))
+        .pipe(jsFilter.restore)
+        .pipe(lessFilter)
+        .pipe(less())
+        .pipe(lessFilter.restore)
+        .pipe(gulp.dest('out/'));
+});
+
+// Restore as a file source
+gulp.task('default', () => {
+    const f = filter(['*', '!src/vendor'], {restore: true, passthrough: false});
+
+    const stream = gulp.src('src/*.js')
+        // filter a subset of the files
+        .pipe(f)
+        // run them through a plugin
+        .pipe(uglify())
+        .pipe(gulp.dest('dist'));
+
+    // use filtered files as a gulp file source
+    f.restore.pipe(gulp.dest('vendor-dist'));
+
+    return stream;
+});

gulp-filter/gulp-filter.d.ts

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+// Type definitions for gulp-filter v3.0.1
+// Project: https://github.com/sindresorhus/gulp-filter
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+/// <reference path="../vinyl/vinyl.d.ts"/>
+/// <reference path="../minimatch/minimatch.d.ts"/>
+
+declare module 'gulp-filter' {
+  import File = require('vinyl');
+  import * as Minimatch from 'minimatch';
+
+  namespace filter {
+    interface FileFunction {
+      (file: File): boolean;
+    }
+
+    interface Options extends Minimatch.IOptions {
+      restore?: boolean;
+      passthrough?: boolean;
+    }
+
+    // A transform stream with a .restore object
+    interface Filter extends NodeJS.ReadWriteStream {
+      restore: NodeJS.ReadWriteStream
+    }
+  }
+
+  function filter(pattern: string | string[] | filter.FileFunction, options?: filter.Options): filter.Filter;
+
+  export = filter;
+}