import { babel } from '@rollup/plugin-babel'
import { builtinModules } from 'module'
import { join, dirname } from 'node:path'
import { fileURLToPath } from 'node:url'
import { defineConfig } from 'vite'

import packageJson from './package.json'

const __dirname = dirname(fileURLToPath(import.meta.url))

function getPathAliasEntries(entriesRecord: Record<string, string>) {
  return Object.entries(entriesRecord).reduce((acc, [aliasName, relativePath]) => {
    acc[aliasName] = join(__dirname, relativePath)
    return acc
  }, entriesRecord)
}

export default defineConfig(({ mode }) => ({
  mode,
  resolve: {
    alias: getPathAliasEntries({
      '@': 'src/',
    }),
  },
  plugins: [
    babel({
      rootMode: 'upward',
      babelHelpers: 'runtime',
      extensions: ['.js', '.ts'],
      skipPreflightCheck: true,
    }),
  ],
  build: {
    sourcemap: mode === 'development',
    emptyOutDir: false,
    outDir: 'dist',
    lib: {
      entry: 'src/index.ts',
      fileName: 'index',
      formats: ['es', 'cjs'],
    },
    rollupOptions: {
      external: [...Object.keys(packageJson.dependencies || {}), ...builtinModules],
    },
  },
}))