rollup.config.mjs

import { babel } from '@rollup/plugin-babel';
import { Addon } from '@embroider/addon-dev/rollup';
import { fileURLToPath } from 'node:url';
import { resolve, dirname } from 'node:path';

const addon = new Addon({
  srcDir: 'src',
  destDir: 'dist',
});

const rootDirectory = dirname(fileURLToPath(import.meta.url));
const babelConfig = resolve(rootDirectory, './babel.publish.config.cjs');
const tsConfig = resolve(rootDirectory, './tsconfig.publish.json');

export default {
  // This provides defaults that work well alongside `publicEntrypoints` below.
  // You can augment this if you need to.
  output: addon.output(),

  plugins: [
    // These are the modules that users should be able to import from your
    // addon. Anything not listed here may get optimized away.
    addon.publicEntrypoints(['**/*.js', 'index.js']),

    // These are the modules that should get reexported into the traditional
    // "app" tree.
    addon.appReexports([
      'components/**/*.js',
      'helpers/**/*.js',
      'modifiers/**/*.js',
      'services/**/*.js',
    ]),

    // Follow the V2 Addon rules about dependencies.
    addon.dependencies(),

    // Ensure that standalone .hbs files are properly integrated as Javascript.
    addon.hbs(),

    // Ensure that .gjs/.gts files are properly integrated as Javascript.
    // Must run before babel so template tags are extracted before TS parsing.
    addon.gjs(),

    // This babel config should *not* apply presets or compile away ES modules.
    babel({
      extensions: ['.js', '.gjs', '.ts', '.gts'],
      babelHelpers: 'bundled',
      configFile: babelConfig,
    }),

    // Emit .d.ts declaration files
    !process.env.SKIP_DECLARATIONS &&
      addon.declarations(
        'declarations',
        `pnpm ember-tsc --declaration --project ${tsConfig}`,
      ),

    // addons are allowed to contain imports of .css files, which we want rollup
    // to leave alone and keep in the published output.
    addon.keepAssets(['**/*.css']),

    // Remove leftover build artifacts when starting a new build.
    addon.clean(),
  ],
};