$ npm install --save-dev gulp-tinypng-nokey

[14:15:01] gulp-tinypng-nokey : [tinypng request] 1.png

[14:15:04] gulp-tinypng-nokey : [compressing] Ok~ 1.png (26.8%)

[14:15:04] gulp-tinypng-nokey : [tinypng request] 2.jpg

[14:15:07] gulp-tinypng-nokey : [compressing] Ok~ 2.jpg (59.8%)

[14:15:07] gulp-tinypng-nokey : [tinypng request] test.js

[14:15:08] gulp-tinypng-nokey [error]:  test.js This file type is not supported

[14:13:40] gulp-tinypng-nokey : [compress completed] skiped: 0 imgs, compressed: 0 imgs, totalSize: 0%

var gulp = require('gulp');
var tiny = require('gulp-tinypng-nokey');

gulp.task('tinypng', function(cb) {
    gulp.src('src/*')
        .pipe(tiny())
        .pipe(gulp.dest('dist'));
});