Gulp – copy and rename a file

I’m not 100% certain what you mean by

copy and rename … in place

But, based on your current code, if you simply wish to:

1. Watch all .js files in the parent directory and
2. Copy them to the cwd (current working directory) and
3. Name all copies, regardless of source file, the same thing

Then you could use gulp-rename to do just that:

var gulp = require('gulp');
var rename = require('gulp-rename');

gulp.task('default', function() {
  return gulp.watch('../**/**.js', function(obj) {
    gulp.src(obj.path)
      .pipe(rename('newFileName.js'))
      .pipe(gulp.dest('.'));
  });
});

In this case, the output filename is newFileName.js

In order to use the module, you’ll need to install the gulp-rename package with npm (ie: npm install gulp-rename).

More examples are available on the package details page on npm @ https://www.npmjs.com/package/gulp-rename#usage