gulpfile.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var umd = require('gulp-umd');

gulp.task('build', ['build-minify', 'build-debug', 'build-docs']);

gulp.task('build-minify', function (cb) {
  return gulp.src(['src/**/*.js'])
    .pipe(concat('indent.min.js'))
    .pipe(umd({
      exports: function (file) {
        return 'indent';
      },
      namespace: function (file) {
        return 'indent';
      }
    }))
    .pipe(uglify({
      mangleProperties: {
        regex: /^\$/
      }
    }))
    .pipe(gulp.dest('./lib'))
});

gulp.task('build-docs', ['build-minify'], function (cb) {
  return gulp.src(['lib/**/*.min.js'])
    .pipe(gulp.dest('./docs/js'))
});

gulp.task('build-debug', function (cb) {
  return gulp.src(['src/**/*.js'])
    .pipe(concat('indent.js'))
    .pipe(umd({
      exports: function (file) {
        return 'indent';
      },
      namespace: function (file) {
        return 'indent';
      }
    }))
    .pipe(gulp.dest('./lib'));
});