Release task for Aurelia projects

release.ts

import * as gulp from 'gulp';
import * as htmlMin from 'gulp-htmlmin';
import * as gzip from 'gulp-gzip';
import * as del from 'del';
import * as jsonMinify from 'gulp-json-minify';
import * as vinylPaths from 'vinyl-paths';
import * as stripDebug from 'gulp-strip-debug';
import * as stripComments from 'gulp-strip-comments';

const copyFnArray = [];

const copyList = [
  { src: 'app/*-*.js', dest: './export/app' },
  { src: 'assets/**/*', dest: './export/assets' },
  { src: 'manifest.json', dest: './export' },
  { src: 'index.html', dest: './export' }
];

for (let i = 0, j = copyList.length; i < j; i++) {
  copyFnArray.push(() => {
    console.log(`copying item ${i + 1}`, copyList[i]);
    return gulp.src(copyList[i].src)
      .pipe(gulp.dest(copyList[i].dest));
  });
}

function cleanExport() {
  return gulp.src('./export')
    .pipe(vinylPaths(del));
}

function cleanApp() {
  return gulp.src('./app')
    .pipe(vinylPaths(del));
}

function prepIndex() {
  return gulp.src('./export/index.html')
    .pipe(htmlMin({ collapseWhitespace: true }))
    .pipe(gulp.dest('./export'))
    .pipe(gzip())
    .pipe(gulp.dest('./export'));
}

function prepJs() {
  return gulp.src('./export/**/*.js')
    .pipe(stripDebug())
    .pipe(stripComments({ safe: true }))
    .pipe(gulp.dest('./export'))
    .pipe(gzip())
    .pipe(gulp.dest('./export'));
}

function prepJson() {
  return gulp.src('./export/**/*.json')
    .pipe(jsonMinify())
    .pipe(gulp.dest('./export'));
}

const release = gulp['series'](
  cleanExport,
  copyFnArray,
  prepJs,
  prepJson,
  prepIndex,
  cleanApp
);

export default release;