gulpfile.js

const rename = require('gulp-rename');
const gulp = require('gulp');
const del = require('del');
const filePaths = require('./dist/src/HighchartsModules.js');

const destinationPath = './dist/highcharts-files/';

gulp.task('update-highcharts', async function() {
    const CORE_FILES_PATH = 'node_modules/highcharts/';

    const moduleFiles = Object.keys(filePaths.modules).map(
        file => CORE_FILES_PATH + 'modules/' + file + '.js'
    );

    // clear destination directory
    del([destinationPath + '*']);

    gulp.src([
        CORE_FILES_PATH + 'highcharts.js',
        CORE_FILES_PATH + 'highcharts-more.js',
        CORE_FILES_PATH + 'highcharts-3d.js',
        ...moduleFiles
    ], {base: './node_modules/highcharts/'})
        // rename files
        .pipe(rename({ extname: '.hcscript'}))
        // copy them into the destination directory
        .pipe(gulp.dest(destinationPath));
});