gulp-debug 
Debug vinyl file streams
$ npm install --save-dev gulp-debugvar gulp = require('gulp');
var debug = require('gulp-debug');
gulp.task('default', function () {
return gulp.src('foo.js')
.pipe(debug({verbose: true}))
.pipe(gulp.dest('dist'));
});Type: string
Default: ''
Give it a title so it's possible to distinguish the output of multiple instances logging at once.
Type: boolean
Default: false
Show more debugging:
- the file stat object
- shows more of the contents, from 40 bytes to 400 bytes
Type: boolean
Default: false
Instead of the full view, only log the path. Also, suppress the 'end' event report.
Type: boolean
Default: false
Show a count of total files processed at the end of the stream.
MIT © Sindre Sorhus