gulp handlebar partials

gupfile.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var handlebars = require('gulp-handlebars');
var wrap = require("gulp-wrap");

gulp.task('partials', function() {
  return gulp.src('templates/partials/*.html')
    .pipe(handlebars())
    .pipe(wrap('Handlebars.registerPartial("<%= fname(file) %>", Handlebars.template(<%= contents %>))', {
      }, {
        imports: {
          fname: function(file) {
            var path = require('path');
            return path.basename(file.path, '.js');
          }
        }
      }))
    .pipe(concat('partials.js'))
    .pipe(gulp.dest('builds/templates'));
});