Dead code elimination

README.md

npm install
npx rollup -c rollup.config.js

Output is

{
  console.log('someCode ran');
}

index.js

const foo = import.meta.env.VITE_ENV === 'staging';

if (foo) {
  console.log('someCode ran');
} else {
  console.log('otherCode ran');
}

package.json

{
  "devDependencies": {
    "@rollup/plugin-terser": "^0.4.4",
    "rollup": "^4.51.0"
  }
}

rollup.config.js

import replace from '@rollup/plugin-replace';

export default {
  input: 'index.js',
  output: {
    file: 'bundle.js',
    format: 'es'
  },
  plugins: [
    // Simulate Vite's env injection
    replace({
      preventAssignment: true,
      'import.meta.env.VITE_ENV': JSON.stringify('staging')
    }),
  ]
};