'use strict';

const path = require('path');
const babel = require('rollup-plugin-babel');
const resolve = require('rollup-plugin-node-resolve');
const banner = require('./banner.js');

const BUNDLE = process.env.BUNDLE === 'true';
const ESM = process.env.ESM === 'true';

let fileDest = `tabler${ESM ? '.esm' : ''}`;
const external = ['popper.js'];
const plugins = [
  babel({
    // Only transpile our source code
    exclude: 'node_modules/**',
    // Include only required helpers
    externalHelpersWhitelist: [
      'defineProperties',
      'createClass',
      'inheritsLoose',
      'defineProperty',
      'objectSpread'
    ]
  })
];

const globals = {
  'popper.js': 'Popper'
};

if (BUNDLE) {
  fileDest += '.bundle';
  // Remove last entry in external array to bundle Popper
  external.pop();
  delete globals['popper.js'];
  plugins.push(resolve());
}

const rollupConfig = {
  input: path.resolve(__dirname, '../js/tabler.js'),
  output: {
    banner,
    file: path.resolve(__dirname, `../dist/js/${fileDest}.js`),
    format: ESM ? 'esm' : 'umd',
    globals
  },
  external,
  plugins
};

if (!ESM) {
  rollupConfig.output.name = 'tabler';
}

module.exports = rollupConfig;