@soleil-se/build-app/rollup/api/getBabelPlugin.js

Script for building WebApps, RESTApps, Widgets and MCP Servers with Svelte in Sitevision.

import { babel } from '@rollup/plugin-babel';
import fse from 'fs-extra';
import { findUpSync } from 'find-up';

const commonOptions = {
  babelrc: false,
  extensions: ['.js', '.mjs', '.html', '.svelte', '.cjs', 'ts'],
  babelHelpers: 'bundled',
};

function hasBrowserslist() {
  return !!findUpSync('.browserslistrc') || !!fse.readJSONSync('./package.json')?.browserslist;
}

export function getBabelClientPlugin() {
  const presetEnvOptions = {
    shippedProposals: true,
    ...(hasBrowserslist() ? {} : {
      targets: [
        'last 2 chrome major versions',
        'last 2 firefox major versions',
        'last 2 ios_saf major versions',
        'last 2 edge major versions',
        'last 2 safari major versions',
        'last 2 and_chr major versions',
      ],
    }),
  };

  return babel({
    ...commonOptions,
    presets: [
      ['@babel/preset-env', presetEnvOptions],
    ],
  });
}

export function getBabelServerPlugin() {
  return babel({
    ...commonOptions,
    presets: [
      ['@babel/preset-env', {
        exclude: ['@babel/plugin-transform-arrow-functions'],
        forceAllTransforms: true,
        ignoreBrowserslistConfig: true,
        shippedProposals: true,
        loose: true,
      }],
    ],
  });
}