rollup.config.ts

import typescript from '@rollup/plugin-typescript'
import { nodeResolve } from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import { visualizer } from 'rollup-plugin-visualizer'
import { RollupOptions } from 'rollup'
import json from '@rollup/plugin-json'
import { readFileSync } from 'node:fs'
const pkg = JSON.parse(
  readFileSync('./package.json', {
    encoding: 'utf8'
  })
)
// import replace from '@rollup/plugin-replace'
// import terser from '@rollup/plugin-terser'
const isProd = process.env.NODE_ENV === 'production'
const isDev = process.env.NODE_ENV === 'development'

const dependencies = pkg.dependencies as Record<string, string> | undefined

const config: RollupOptions = {
  input: 'src/index.ts',
  // { index: 'src/index.ts', cli: 'src/cli.ts' },
  output: [
    {
      file: pkg.main,
      format: 'cjs',
      sourcemap: isDev,
      exports: 'auto',
      plugins: [
        isProd
          ? visualizer({
              filename: 'stats/cjs.html'
            })
          : undefined
      ],
      esModule: true,
      generatedCode: {
        reservedNamesAsProps: false
      },
      interop: 'compat',
      systemNullSetters: false
    },
    {
      format: 'esm',
      file: pkg.module,
      sourcemap: isDev,
      plugins: [
        isProd
          ? visualizer({
              filename: 'stats/esm.html'
            })
          : undefined
      ],
      esModule: true,
      generatedCode: {
        reservedNamesAsProps: false
      },
      interop: 'compat',
      systemNullSetters: false
    }
    // {
    //   dir: 'dist',
    //   format: 'cjs',
    //   sourcemap: isDev,
    //   exports: 'auto'
    // },
  ],
  makeAbsoluteExternalsRelative: true,
  preserveEntrySignatures: 'strict',
  plugins: [
    json(),
    nodeResolve({
      preferBuiltins: true
    }),
    commonjs(),
    typescript({ tsconfig: './tsconfig.build.json', sourceMap: isDev })
  ],
  external: [...(dependencies ? Object.keys(dependencies) : [])]
}

export default config