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var pipeline = require('readable-stream').pipeline;
var del = require('del');
var gulp = require('gulp');
var sourcemaps = require('gulp-sourcemaps');
var babel = require('gulp-babel');
var uglify = require('gulp-uglify');
var sass = require('gulp-sass');
sass.compiler = require('node-sass');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var cssnano = require('cssnano');
var rename = require('gulp-rename');

function devJs() {
  return pipeline(
    gulp.src('assets/js/fuji.js'),
    sourcemaps.init(),
    babel({
      presets: ['@babel/env'],
    }),
    rename({ suffix: '.min' }),
    sourcemaps.write('.'),
    gulp.dest('static/assets/js/')
  );
}

function devCss() {
  return pipeline(
    gulp.src('assets/scss/fuji.scss'),
    sourcemaps.init(),
    sass(),
    postcss([autoprefixer()]),
    rename({ suffix: '.min' }),
    sourcemaps.write('.'),
    gulp.dest('static/assets/css/')
  );
}

function js() {
  return pipeline(
    gulp.src('assets/js/fuji.js'),
    babel({
      presets: ['@babel/env'],
    }),
    uglify(),
    rename({ suffix: '.min' }),
    gulp.dest('static/assets/js/')
  );
}

function css() {
  return pipeline(
    gulp.src('assets/scss/fuji.scss'),
    sass(),
    postcss([autoprefixer(), cssnano()]),
    rename({ suffix: '.min' }),
    gulp.dest('static/assets/css/')
  );
}

function clean() {
  return del(['static/assets/css/fuji.min.css.map', 'static/assets/js/fuji.min.js.map']);
}

exports.build = gulp.parallel(js, css, clean);
exports.devJs = function () {
  devJs();
  return gulp.watch('assets/js/fuji.js', { delay: 500 }, devJs);
};
exports.devCss = function () {
  devJs();
  return gulp.watch('assets/**/*.scss', { delay: 500 }, devCss);
};