gulp-modify-file

Gulp plugin allow modify file in .pipe

```javascript const gulp = require('gulp') gulp.task('js', () => {

const modifyFile = require('gulp-modify-file')

return gulp

.src('app/**/*.js')

.pipe(modifyFile((content, path, file) => {

const start = '(function (){\n'

const end = '\n})()'

return `${start}${content}${end}`

}))

.pipe(gulp.dest('build'))

}) ```