rollup.config.mjs

import ts from 'rollup-plugin-ts';
import { Addon } from '@embroider/addon-dev/rollup';
import { nodeResolve } from '@rollup/plugin-node-resolve';

const addon = new Addon({
  srcDir: 'src',
  destDir: 'dist'
});
const extensions = ['.js', '.gjs', '.ts', '.gts'];

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([
      'components/*.js',
      'helpers/**/*.js',
      'utils/**/*.js',
      'index.js',
      'template-registry.js'
    ]),

    // These are the modules that should get reexported into the traditional
    // "app" tree. Things in here should also be in publicEntrypoints above, but
    // not everything in publicEntrypoints necessarily needs to go here.
    addon.appReexports(['components/*.js', 'helpers/**/*.js', 'utils/**/*.js']),

    // Follow the V2 Addon rules about dependencies. Your code can import from
    // `dependencies` and `peerDependencies` as well as standard Ember-provided
    // package names.
    addon.dependencies(),

    addon.gjs(),

    nodeResolve({ extensions }),

    // This babel config should *not* apply presets or compile away ES modules.
    // It exists only to provide development niceties for you, like automatic
    // template colocation.
    // See `babel.config.json` for the actual Babel configuration!
    ts({
      transpiler: 'babel',
      transpileOnly: true,
      babelConfig: './babel.config.js',
      browserslist: ['last 2 firefox versions', 'last 2 chrome versions']
    }),

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

    // 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()
  ]
};