rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import terser from '@rollup/plugin-terser';

const input = 'src/index.js';
const external = ['plotly.js-dist', 'three'];

const banner = `/*!
 * welltraj v${process.env.npm_package_version || '1.0.0'}
 * Well trajectory design and analysis library
 * (c) Ismail Harkat — MIT License
 */`;

export default [
  // ES Module (tree-shakeable, for bundlers)
  {
    input,
    external,
    output: {
      file: 'dist/welltraj.esm.js',
      format: 'esm',
      sourcemap: true,
      banner
    },
    plugins: [resolve()]
  },
  // CommonJS (for Node.js)
  {
    input,
    external,
    output: {
      file: 'dist/welltraj.cjs.js',
      format: 'cjs',
      sourcemap: true,
      exports: 'named',
      banner
    },
    plugins: [resolve()]
  },
  // UMD (for browser CDN / <script> tag)
  {
    input,
    external,
    output: {
      file: 'dist/welltraj.umd.js',
      format: 'umd',
      name: 'WellTraj',
      sourcemap: true,
      globals: {
        'plotly.js-dist': 'Plotly',
        'three': 'THREE'
      },
      banner
    },
    plugins: [resolve(), terser()]
  }
];