vite-config.mjs

import { copyFileSync } from 'node:fs'
import { defineConfig } from 'vite'
import dts from 'vite-plugin-dts'

export default (entry, external = []) =>
  defineConfig({
    build: {
      lib: {
        entry,
        fileName: 'index',
        formats: ['es', 'cjs'],
      },
      minify: true,
      rollupOptions: {
        external: (id) => {
          return id.startsWith('@opentelemetry') || external.includes(id)
        },
        output: {
          exports: 'named',
        },
      },
    },
    define: {
      PACKAGE_TIMESTAMP: new Date().getTime(),
      PACKAGE_VERSION: JSON.stringify(process.env.npm_package_version || '0.0.0'),
    },
    plugins: [
      dts({
        // https://github.com/arethetypeswrong
        // https://github.com/qmhc/vite-plugin-dts/issues/267#issuecomment-1786996676
        afterBuild: () => {
          // To pass publint (`npm x publint@latest`) and ensure the
          // package is supported by all consumers, we must export types that are
          // read as ESM. To do this, there must be duplicate types with the
          // correct extension supplied in the package.json exports field.
          copyFileSync('dist/index.d.ts', 'dist/index.d.cts')
        },
        compilerOptions: { skipLibCheck: true },
        rollupTypes: true,
        staticImport: true,
      }),
    ],
  })