gulp-debug 
Debug Vinyl file streams to see what files are run through your Gulp pipeline
Install
$ npm install --save-dev gulp-debug
Usage
const gulp = require('gulp');
const debug = require('gulp-debug');
exports.default = () => (
gulp.src('foo.js')
.pipe(debug({title: 'unicorn:'}))
.pipe(gulp.dest('dist'))
);
API
debug(options?)
options
Type: object
title
Type: string
Default: gulp-debug:
Give it a custom title so it's possible to distinguish the output of multiple instances logging at once.
minimal
Type: boolean
Default: true
By default only relative paths are shown. Turn off minimal mode to also show cwd, base, path.
The stat property will be shown when you run gulp in verbose mode: gulp --verbose.
showFiles
Type: boolean
Default: true
Print filenames.
showCount
Type: boolean
Default: true
Print the file count.
logger(message)
Type: Function
Default: fancy-log
Provide your own logging utility in place of fancy-log. The message is passed as a string in the first argument. Note that ANSI colors may be used in the message.