gulpfile.js

const { series } = require('gulp');
const fs = require('fs');
const gulp = require('gulp');
const zip = require('gulp-zip');
const webpack = require('webpack');
const merge = require('merge-stream');
const webpackConfig = require('./webpack.config.js')

const filesToCopy = [
    'package.json',
    'icon.png',
    'LICENSE.md',
    'README.md'
];

function clean(cb) {
    fs.rmdir('./package', { recursive: true }, (err) => {
        if (err) { console.log('Clean', err) }
        cb();
    });
}

function build(cb) {
    webpack({...webpackConfig, mode: 'production' }, (err, stats) => {
        if (err) { console.log('Webpack', err) }
        console.log(stats.toString({ /* stats options */ }))
        cb();
    });
}

function stage() {
    const streams = filesToCopy.map(file => {
        if (fs.existsSync(file)) {
            return gulp.src(file).pipe(gulp.dest('package/analytics'));
        }
    }).filter(s => s != undefined);
    return merge([
        ...streams,
        gulp.src('dist/**/*').pipe(gulp.dest('package/analytics/dist')),
        gulp.src('static/**/*').pipe(gulp.dest('package/analytics/static')),
    ]);
}

function package() {
    return gulp.src('package/**/*').pipe(zip('extension.fplx')).pipe(gulp.dest('.'));
}

exports.clean = clean;
exports.build = build;
exports.stage = stage;
exports.package = package;
exports.default = series(clean, build, stage, package);