gulpfile.js

/* eslint-env node */
const path = require('path');
const {task, src, dest, series} = require('gulp');
const rimraf = require('rimraf');
const ts = require('gulp-typescript');
const replace = require('gulp-replace');
const sass = require('gulp-dart-sass');

const BUILD_DIR = path.resolve('build');

task('clean', (done) => {
    rimraf.sync(BUILD_DIR);
    rimraf.sync('styles/**/*.css');
    done();
});

function compileTs() {
    const tsProject = ts.createProject('tsconfig.json', {
        declaration: true,
        module: 'esnext',
    });

    return src(['src/**/*.{js,jsx,ts,tsx}'])
        .pipe(replace(/import '.+\.scss';/g, (match) => match.replace('.scss', '.css')))
        .pipe(tsProject())
        .pipe(dest(path.resolve(BUILD_DIR)));
}

task('compile-to-esm', () => {
    return compileTs();
});

task('copy-js-declarations', () => {
    return src(['src/**/*.d.ts']).pipe(dest(path.resolve(BUILD_DIR)));
});

task('copy-i18n', () => {
    return src(['src/**/*.json']).pipe(dest(path.resolve(BUILD_DIR)));
});

task('styles-components', () => {
    return src('src/**/*.scss')
        .pipe(
            sass({
                includePaths: ['node_modules'],
            }),
        )
        .pipe(sass().on('error', sass.logError))
        .pipe(dest(path.resolve(BUILD_DIR)));
});

task(
    'build',
    series(['clean', 'compile-to-esm', 'copy-js-declarations', 'copy-i18n', 'styles-components']),
);

task('default', series(['build']));