gulpfile.js

const fs = require('fs'),
      gulp = require('gulp'),
      clean = require('gulp-clean'),
      include = require('gulp-include'),
      rename = require('gulp-rename'),
      zip = require('gulp-zip');

gulp.task('clean', function() {
    return gulp.src('dist', {read: false})
        .pipe(clean());
});

gulp.task('build', gulp.series('clean', function() {
    return Promise.all([
        gulp.src('index.js')
            .pipe(include())
            .on('error', console.log)
            .pipe(gulp.dest('dist')),

        gulp.src('partials/*.html')
            .pipe(gulp.dest('dist/partials')),

        gulp.src('module.json')
            .pipe(gulp.dest('dist'))
    ])
}));

gulp.task('release', function() {
    let moduleInfo = JSON.parse(fs.readFileSync('module.json')),
        moduleId = moduleInfo.id,
        moduleVersion = moduleInfo.version,
        zipFileName = `${moduleId}-v${moduleVersion}.zip`;

    console.log(`Packaging ${zipFileName}`);

    return gulp.src('dist/**/*', { base: 'dist/'})
        .pipe(rename((path) => path.dirname = `${moduleId}/${path.dirname}`))
        .pipe(zip(zipFileName))
        .pipe(gulp.dest('.'));
});

gulp.task('default', gulp.series('build', 'release'));