build.ts

import fs from 'node:fs'
import path from 'node:path'
import colors from 'picocolors'
import type {
  ExternalOption,
  InputOption,
  InternalModuleFormat,
  LoggingFunction,
  ModuleFormat,
  OutputOptions,
  Plugin,
  RollupBuild,
  RollupError,
  RollupLog,
  RollupOptions,
  RollupOutput,
  RollupWatcher,
  WatcherOptions,
} from 'rollup'
import commonjsPlugin from '@rollup/plugin-commonjs'
import type { RollupCommonJSOptions } from 'dep-types/commonjs'
import type { RollupDynamicImportVarsOptions } from 'dep-types/dynamicImportVars'
import type { TransformOptions } from 'esbuild'
import type { InlineConfig, ResolvedConfig } from './config'
import { isDepsOptimizerEnabled, resolveConfig } from './config'
import { buildReporterPlugin } from './plugins/reporter'
import { buildEsbuildPlugin } from './plugins/esbuild'
import { type TerserOptions, terserPlugin } from './plugins/terser'
import {
  arraify,
  asyncFlatten,
  copyDir,
  emptyDir,
  joinUrlSegments,
  normalizePath,
  requireResolveFromRootWithFallback,
  withTrailingSlash,
} from './utils'
import { manifestPlugin } from './plugins/manifest'
import type { Logger } from './logger'
import { dataURIPlugin } from './plugins/dataUri'
import { buildImportAnalysisPlugin } from './plugins/importAnalysisBuild'
import { ssrManifestPlugin } from './ssr/ssrManifestPlugin'
import { initDepsOptimizer } from './optimizer'
import { loadFallbackPlugin } from './plugins/loadFallback'
import { findNearestPackageData } from './packages'
import type { PackageCache } from './packages'
import {
  DEFAULT_ASSETS_INLINE_LIMIT,
  ESBUILD_MODULES_TARGET,
  VERSION,
} from './constants'
import { resolveChokidarOptions } from './watch'
import { completeSystemWrapPlugin } from './plugins/completeSystemWrap'
import { mergeConfig } from './publicUtils'
import { webWorkerPostPlugin } from './plugins/worker'
import { getHookHandler } from './plugins'

export interface BuildOptions {
  /**
   * Compatibility transform target. The transform is performed with esbuild
   * and the lowest supported target is es2015/es6. Note this only handles
   * syntax transformation and does not cover polyfills (except for dynamic
   * import)
   *
   * Default: 'modules' - Similar to `@babel/preset-env`'s targets.esmodules,
   * transpile targeting browsers that natively support dynamic es module imports.
   * https://caniuse.com/es6-module-dynamic-import
   *
   * Another special value is 'esnext' - which only performs minimal transpiling
   * (for minification compat) and assumes native dynamic imports support.
   *
   * For custom targets, see https://esbuild.github.io/api/#target and
   * https://esbuild.github.io/content-types/#javascript for more details.
   * @default 'modules'
   */
  target?: 'modules' | TransformOptions['target'] | false
  /**
   * whether to inject module preload polyfill.
   * Note: does not apply to library mode.
   * @default true
   * @deprecated use `modulePreload.polyfill` instead
   */
  polyfillModulePreload?: boolean
  /**
   * Configure module preload
   * Note: does not apply to library mode.
   * @default true
   */
  modulePreload?: boolean | ModulePreloadOptions
  /**
   * Directory relative from `root` where build output will be placed. If the
   * directory exists, it will be removed before the build.
   * @default 'dist'
   */
  outDir?: string
  /**
   * Directory relative from `outDir` where the built js/css/image assets will
   * be placed.
   * @default 'assets'
   */
  assetsDir?: string
  /**
   * Static asset files smaller than this number (in bytes) will be inlined as
   * base64 strings. Default limit is `4096` (4 KiB). Set to `0` to disable.
   * @default 4096
   */
  assetsInlineLimit?:
    | number
    | ((filePath: string, content: Buffer) => boolean | undefined)
  /**
   * Whether to code-split CSS. When enabled, CSS in async chunks will be
   * inlined as strings in the chunk and inserted via dynamically created
   * style tags when the chunk is loaded.
   * @default true
   */
  cssCodeSplit?: boolean
  /**
   * An optional separate target for CSS minification.
   * As esbuild only supports configuring targets to mainstream
   * browsers, users may need this option when they are targeting
   * a niche browser that comes with most modern JavaScript features
   * but has poor CSS support, e.g. Android WeChat WebView, which
   * doesn't support the #RGBA syntax.
   * @default target
   */
  cssTarget?: TransformOptions['target'] | false
  /**
   * Override CSS minification specifically instead of defaulting to `build.minify`,
   * so you can configure minification for JS and CSS separately.
   * @default 'esbuild'
   */
  cssMinify?: boolean | 'esbuild' | 'lightningcss'
  /**
   * If `true`, a separate sourcemap file will be created. If 'inline', the
   * sourcemap will be appended to the resulting output file as data URI.
   * 'hidden' works like `true` except that the corresponding sourcemap
   * comments in the bundled files are suppressed.
   * @default false
   */
  sourcemap?: boolean | 'inline' | 'hidden'
  /**
   * Set to `false` to disable minification, or specify the minifier to use.
   * Available options are 'terser' or 'esbuild'.
   * @default 'esbuild'
   */
  minify?: boolean | 'terser' | 'esbuild'
  /**
   * Options for terser
   * https://terser.org/docs/api-reference#minify-options
   *
   * In addition, you can also pass a `maxWorkers: number` option to specify the
   * max number of workers to spawn. Defaults to the number of CPUs minus 1.
   */
  terserOptions?: TerserOptions
  /**
   * Will be merged with internal rollup options.
   * https://rollupjs.org/configuration-options/
   */
  rollupOptions?: RollupOptions
  /**
   * Options to pass on to `@rollup/plugin-commonjs`
   */
  commonjsOptions?: RollupCommonJSOptions
  /**
   * Options to pass on to `@rollup/plugin-dynamic-import-vars`
   */
  dynamicImportVarsOptions?: RollupDynamicImportVarsOptions
  /**
   * Whether to write bundle to disk
   * @default true
   */
  write?: boolean
  /**
   * Empty outDir on write.
   * @default true when outDir is a sub directory of project root
   */
  emptyOutDir?: boolean | null
  /**
   * Copy the public directory to outDir on write.
   * @default true
   */
  copyPublicDir?: boolean
  /**
   * Whether to emit a .vite/manifest.json under assets dir to map hash-less filenames
   * to their hashed versions. Useful when you want to generate your own HTML
   * instead of using the one generated by Vite.
   *
   * Example:
   *
   * ```json
   * {
   *   "main.js": {
   *     "file": "main.68fe3fad.js",
   *     "css": "main.e6b63442.css",
   *     "imports": [...],
   *     "dynamicImports": [...]
   *   }
   * }
   * ```
   * @default false
   */
  manifest?: boolean | string
  /**
   * Build in library mode. The value should be the global name of the lib in
   * UMD mode. This will produce esm + cjs + umd bundle formats with default
   * configurations that are suitable for distributing libraries.
   * @default false
   */
  lib?: LibraryOptions | false
  /**
   * Produce SSR oriented build. Note this requires specifying SSR entry via
   * `rollupOptions.input`.
   * @default false
   */
  ssr?: boolean | string
  /**
   * Generate SSR manifest for determining style links and asset preload
   * directives in production.
   * @default false
   */
  ssrManifest?: boolean | string
  /**
   * Emit assets during SSR.
   * @default false
   */
  ssrEmitAssets?: boolean
  /**
   * Set to false to disable reporting compressed chunk sizes.
   * Can slightly improve build speed.
   * @default true
   */
  reportCompressedSize?: boolean
  /**
   * Adjust chunk size warning limit (in kB).
   * @default 500
   */
  chunkSizeWarningLimit?: number
  /**
   * Rollup watch options
   * https://rollupjs.org/configuration-options/#watch
   * @default null
   */
  watch?: WatcherOptions | null
}

export interface LibraryOptions {
  /**
   * Path of library entry
   */
  entry: InputOption
  /**
   * The name of the exposed global variable. Required when the `formats` option includes
   * `umd` or `iife`
   */
  name?: string
  /**
   * Output bundle formats
   * @default ['es', 'umd']
   */
  formats?: LibraryFormats[]
  /**
   * The name of the package file output. The default file name is the name option
   * of the project package.json. It can also be defined as a function taking the
   * format as an argument.
   */
  fileName?: string | ((format: ModuleFormat, entryName: string) => string)
}

export type LibraryFormats = 'es' | 'cjs' | 'umd' | 'iife'

export interface ModulePreloadOptions {
  /**
   * Whether to inject a module preload polyfill.
   * Note: does not apply to library mode.
   * @default true
   */
  polyfill?: boolean
  /**
   * Resolve the list of dependencies to preload for a given dynamic import
   * @experimental
   */
  resolveDependencies?: ResolveModulePreloadDependenciesFn
}
export interface ResolvedModulePreloadOptions {
  polyfill: boolean
  resolveDependencies?: ResolveModulePreloadDependenciesFn
}

export type ResolveModulePreloadDependenciesFn = (
  filename: string,
  deps: string[],
  context: {
    hostId: string
    hostType: 'html' | 'js'
  },
) => string[]

export interface ResolvedBuildOptions
  extends Required<Omit<BuildOptions, 'polyfillModulePreload'>> {
  modulePreload: false | ResolvedModulePreloadOptions
}

export function resolveBuildOptions(
  raw: BuildOptions | undefined,
  logger: Logger,
  root: string,
): ResolvedBuildOptions {
  const deprecatedPolyfillModulePreload = raw?.polyfillModulePreload
  if (raw) {
    const { polyfillModulePreload, ...rest } = raw
    raw = rest
    if (deprecatedPolyfillModulePreload !== undefined) {
      logger.warn(
        'polyfillModulePreload is deprecated. Use modulePreload.polyfill instead.',
      )
    }
    if (
      deprecatedPolyfillModulePreload === false &&
      raw.modulePreload === undefined
    ) {
      raw.modulePreload = { polyfill: false }
    }
  }

  const modulePreload = raw?.modulePreload
  const defaultModulePreload = {
    polyfill: true,
  }

  const defaultBuildOptions: BuildOptions = {
    outDir: 'dist',
    assetsDir: 'assets',
    assetsInlineLimit: DEFAULT_ASSETS_INLINE_LIMIT,
    cssCodeSplit: !raw?.lib,
    sourcemap: false,
    rollupOptions: {},
    minify: raw?.ssr ? false : 'esbuild',
    terserOptions: {},
    write: true,
    emptyOutDir: null,
    copyPublicDir: true,
    manifest: false,
    lib: false,
    ssr: false,
    ssrManifest: false,
    ssrEmitAssets: false,
    reportCompressedSize: true,
    chunkSizeWarningLimit: 500,
    watch: null,
  }

  const userBuildOptions = raw
    ? mergeConfig(defaultBuildOptions, raw)
    : defaultBuildOptions

  // @ts-expect-error Fallback options instead of merging
  const resolved: ResolvedBuildOptions = {
    target: 'modules',
    cssTarget: false,
    ...userBuildOptions,
    commonjsOptions: {
      include: [/node_modules/],
      extensions: ['.js', '.cjs'],
      ...userBuildOptions.commonjsOptions,
    },
    dynamicImportVarsOptions: {
      warnOnError: true,
      exclude: [/node_modules/],
      ...userBuildOptions.dynamicImportVarsOptions,
    },
    // Resolve to false | object
    modulePreload:
      modulePreload === false
        ? false
        : typeof modulePreload === 'object'
          ? {
              ...defaultModulePreload,
              ...modulePreload,
            }
          : defaultModulePreload,
  }

  // handle special build targets
  if (resolved.target === 'modules') {
    resolved.target = ESBUILD_MODULES_TARGET
  } else if (resolved.target === 'esnext' && resolved.minify === 'terser') {
    try {
      const terserPackageJsonPath = requireResolveFromRootWithFallback(
        root,
        'terser/package.json',
      )
      const terserPackageJson = JSON.parse(
        fs.readFileSync(terserPackageJsonPath, 'utf-8'),
      )
      const v = terserPackageJson.version.split('.')
      if (v[0] === '5' && v[1] < 16) {
        // esnext + terser 5.16<: limit to es2021 so it can be minified by terser
        resolved.target = 'es2021'
      }
    } catch {}
  }

  if (!resolved.cssTarget) {
    resolved.cssTarget = resolved.target
  }

  // normalize false string into actual false
  if ((resolved.minify as string) === 'false') {
    resolved.minify = false
  } else if (resolved.minify === true) {
    resolved.minify = 'esbuild'
  }

  if (resolved.cssMinify == null) {
    resolved.cssMinify = !!resolved.minify
  }

  return resolved
}

export async function resolveBuildPlugins(config: ResolvedConfig): Promise<{
  pre: Plugin[]
  post: Plugin[]
}> {
  const options = config.build
  const { commonjsOptions } = options
  const usePluginCommonjs =
    !Array.isArray(commonjsOptions?.include) ||
    commonjsOptions?.include.length !== 0
  const rollupOptionsPlugins = options.rollupOptions.plugins
  return {
    pre: [
      completeSystemWrapPlugin(),
      ...(usePluginCommonjs ? [commonjsPlugin(options.commonjsOptions)] : []),
      dataURIPlugin(),
      ...((await asyncFlatten(arraify(rollupOptionsPlugins))).filter(
        Boolean,
      ) as Plugin[]),
      ...(config.isWorker ? [webWorkerPostPlugin()] : []),
    ],
    post: [
      buildImportAnalysisPlugin(config),
      ...(config.esbuild !== false ? [buildEsbuildPlugin(config)] : []),
      ...(options.minify ? [terserPlugin(config)] : []),
      ...(!config.isWorker
        ? [
            ...(options.manifest ? [manifestPlugin(config)] : []),
            ...(options.ssrManifest ? [ssrManifestPlugin(config)] : []),
            buildReporterPlugin(config),
          ]
        : []),
      loadFallbackPlugin(),
    ],
  }
}

/**
 * Bundles the app for production.
 * Returns a Promise containing the build result.
 */
export async function build(
  inlineConfig: InlineConfig = {},
): Promise<RollupOutput | RollupOutput[] | RollupWatcher> {
  const config = await resolveConfig(
    inlineConfig,
    'build',
    'production',
    'production',
  )
  const options = config.build
  const ssr = !!options.ssr
  const libOptions = options.lib

  config.logger.info(
    colors.cyan(
      `vite v${VERSION} ${colors.green(
        `building ${ssr ? `SSR bundle ` : ``}for ${config.mode}...`,
      )}`,
    ),
  )

  const resolve = (p: string) => path.resolve(config.root, p)
  const input = libOptions
    ? options.rollupOptions?.input ||
      (typeof libOptions.entry === 'string'
        ? resolve(libOptions.entry)
        : Array.isArray(libOptions.entry)
          ? libOptions.entry.map(resolve)
          : Object.fromEntries(
              Object.entries(libOptions.entry).map(([alias, file]) => [
                alias,
                resolve(file),
              ]),
            ))
    : typeof options.ssr === 'string'
      ? resolve(options.ssr)
      : options.rollupOptions?.input || resolve('index.html')

  if (ssr && typeof input === 'string' && input.endsWith('.html')) {
    throw new Error(
      `rollupOptions.input should not be an html file when building for SSR. ` +
        `Please specify a dedicated SSR entry.`,
    )
  }
  if (config.build.cssCodeSplit === false) {
    const inputs =
      typeof input === 'string'
        ? [input]
        : Array.isArray(input)
          ? input
          : Object.values(input)
    if (inputs.some((input) => input.endsWith('.css'))) {
      throw new Error(
        `When "build.cssCodeSplit: false" is set, "rollupOptions.input" should not include CSS files.`,
      )
    }
  }

  const outDir = resolve(options.outDir)

  // inject ssr arg to plugin load/transform hooks
  const plugins = (
    ssr ? config.plugins.map((p) => injectSsrFlagToHooks(p)) : config.plugins
  ) as Plugin[]

  if (isDepsOptimizerEnabled(config, ssr)) {
    await initDepsOptimizer(config)
  }

  const rollupOptions: RollupOptions = {
    preserveEntrySignatures: ssr
      ? 'allow-extension'
      : libOptions
        ? 'strict'
        : false,
    cache: config.build.watch ? undefined : false,
    ...options.rollupOptions,
    input,
    plugins,
    external: options.rollupOptions?.external,
    onwarn(warning, warn) {
      onRollupWarning(warning, warn, config)
    },
  }

  const outputBuildError = (e: RollupError) => {
    let msg = colors.red((e.plugin ? `[${e.plugin}] ` : '') + e.message)
    if (e.id) {
      msg += `\nfile: ${colors.cyan(
        e.id + (e.loc ? `:${e.loc.line}:${e.loc.column}` : ''),
      )}`
    }
    if (e.frame) {
      msg += `\n` + colors.yellow(e.frame)
    }
    clearLine()
    config.logger.error(msg, { error: e })
  }

  let bundle: RollupBuild | undefined
  try {
    const buildOutputOptions = (output: OutputOptions = {}): OutputOptions => {
      // @ts-expect-error See https://github.com/vitejs/vite/issues/5812#issuecomment-984345618
      if (output.output) {
        config.logger.warn(
          `You've set "rollupOptions.output.output" in your config. ` +
            `This is deprecated and will override all Vite.js default output options. ` +
            `Please use "rollupOptions.output" instead.`,
        )
      }
      if (output.file) {
        throw new Error(
          `Vite does not support "rollupOptions.output.file". ` +
            `Please use "rollupOptions.output.dir" and "rollupOptions.output.entryFileNames" instead.`,
        )
      }
      if (output.sourcemap) {
        config.logger.warnOnce(
          colors.yellow(
            `Vite does not support "rollupOptions.output.sourcemap". ` +
              `Please use "build.sourcemap" instead.`,
          ),
        )
      }

      const ssrNodeBuild = ssr && config.ssr.target === 'node'
      const ssrWorkerBuild = ssr && config.ssr.target === 'webworker'

      const format = output.format || 'es'
      const jsExt =
        ssrNodeBuild || libOptions
          ? resolveOutputJsExtension(
              format,
              findNearestPackageData(config.root, config.packageCache)?.data
                .type,
            )
          : 'js'
      return {
        dir: outDir,
        // Default format is 'es' for regular and for SSR builds
        format,
        exports: 'auto',
        sourcemap: options.sourcemap,
        name: libOptions ? libOptions.name : undefined,
        // es2015 enables `generatedCode.symbols`
        // - #764 add `Symbol.toStringTag` when build es module into cjs chunk
        // - #1048 add `Symbol.toStringTag` for module default export
        generatedCode: 'es2015',
        entryFileNames: ssr
          ? `[name].${jsExt}`
          : libOptions
            ? ({ name }) =>
                resolveLibFilename(
                  libOptions,
                  format,
                  name,
                  config.root,
                  jsExt,
                  config.packageCache,
                )
            : path.posix.join(options.assetsDir, `[name]-[hash].${jsExt}`),
        chunkFileNames: libOptions
          ? `[name]-[hash].${jsExt}`
          : path.posix.join(options.assetsDir, `[name]-[hash].${jsExt}`),
        assetFileNames: libOptions
          ? `[name].[ext]`
          : path.posix.join(options.assetsDir, `[name]-[hash].[ext]`),
        inlineDynamicImports:
          output.format === 'umd' ||
          output.format === 'iife' ||
          (ssrWorkerBuild &&
            (typeof input === 'string' || Object.keys(input).length === 1)),
        ...output,
      }
    }

    // resolve lib mode outputs
    const outputs = resolveBuildOutputs(
      options.rollupOptions?.output,
      libOptions,
      config.logger,
    )
    const normalizedOutputs: OutputOptions[] = []

    if (Array.isArray(outputs)) {
      for (const resolvedOutput of outputs) {
        normalizedOutputs.push(buildOutputOptions(resolvedOutput))
      }
    } else {
      normalizedOutputs.push(buildOutputOptions(outputs))
    }

    const outDirs = normalizedOutputs.map(({ dir }) => resolve(dir!))

    // watch file changes with rollup
    if (config.build.watch) {
      config.logger.info(colors.cyan(`\nwatching for file changes...`))

      const resolvedChokidarOptions = resolveChokidarOptions(
        config,
        config.build.watch.chokidar,
      )

      const { watch } = await import('rollup')
      const watcher = watch({
        ...rollupOptions,
        output: normalizedOutputs,
        watch: {
          ...config.build.watch,
          chokidar: resolvedChokidarOptions,
        },
      })

      watcher.on('event', (event) => {
        if (event.code === 'BUNDLE_START') {
          config.logger.info(colors.cyan(`\nbuild started...`))
          if (options.write) {
            prepareOutDir(outDirs, options.emptyOutDir, config)
          }
        } else if (event.code === 'BUNDLE_END') {
          event.result.close()
          config.logger.info(colors.cyan(`built in ${event.duration}ms.`))
        } else if (event.code === 'ERROR') {
          outputBuildError(event.error)
        }
      })

      return watcher
    }

    // write or generate files with rollup
    const { rollup } = await import('rollup')
    bundle = await rollup(rollupOptions)

    if (options.write) {
      prepareOutDir(outDirs, options.emptyOutDir, config)
    }

    const res: RollupOutput[] = []
    for (const output of normalizedOutputs) {
      res.push(await bundle[options.write ? 'write' : 'generate'](output))
    }
    return Array.isArray(outputs) ? res : res[0]
  } catch (e) {
    outputBuildError(e)
    throw e
  } finally {
    if (bundle) await bundle.close()
  }
}

function prepareOutDir(
  outDirs: string[],
  emptyOutDir: boolean | null,
  config: ResolvedConfig,
) {
  const nonDuplicateDirs = new Set(outDirs)
  let outside = false
  if (emptyOutDir == null) {
    for (const outDir of nonDuplicateDirs) {
      if (
        fs.existsSync(outDir) &&
        !normalizePath(outDir).startsWith(withTrailingSlash(config.root))
      ) {
        // warn if outDir is outside of root
        config.logger.warn(
          colors.yellow(
            `\n${colors.bold(`(!)`)} outDir ${colors.white(
              colors.dim(outDir),
            )} is not inside project root and will not be emptied.\n` +
              `Use --emptyOutDir to override.\n`,
          ),
        )
        outside = true
        break
      }
    }
  }
  for (const outDir of nonDuplicateDirs) {
    if (!outside && emptyOutDir !== false && fs.existsSync(outDir)) {
      // skip those other outDirs which are nested in current outDir
      const skipDirs = outDirs
        .map((dir) => {
          const relative = path.relative(outDir, dir)
          if (
            relative &&
            !relative.startsWith('..') &&
            !path.isAbsolute(relative)
          ) {
            return relative
          }
          return ''
        })
        .filter(Boolean)
      emptyDir(outDir, [...skipDirs, '.git'])
    }
    if (
      config.build.copyPublicDir &&
      config.publicDir &&
      fs.existsSync(config.publicDir)
    ) {
      if (!areSeparateFolders(outDir, config.publicDir)) {
        config.logger.warn(
          colors.yellow(
            `\n${colors.bold(
              `(!)`,
            )} The public directory feature may not work correctly. outDir ${colors.white(
              colors.dim(outDir),
            )} and publicDir ${colors.white(
              colors.dim(config.publicDir),
            )} are not separate folders.\n`,
          ),
        )
      }
      copyDir(config.publicDir, outDir)
    }
  }
}

function getPkgName(name: string) {
  return name?.[0] === '@' ? name.split('/')[1] : name
}

type JsExt = 'js' | 'cjs' | 'mjs'

function resolveOutputJsExtension(
  format: ModuleFormat,
  type: string = 'commonjs',
): JsExt {
  if (type === 'module') {
    return format === 'cjs' || format === 'umd' ? 'cjs' : 'js'
  } else {
    return format === 'es' ? 'mjs' : 'js'
  }
}

export function resolveLibFilename(
  libOptions: LibraryOptions,
  format: ModuleFormat,
  entryName: string,
  root: string,
  extension?: JsExt,
  packageCache?: PackageCache,
): string {
  if (typeof libOptions.fileName === 'function') {
    return libOptions.fileName(format, entryName)
  }

  const packageJson = findNearestPackageData(root, packageCache)?.data
  const name =
    libOptions.fileName ||
    (packageJson && typeof libOptions.entry === 'string'
      ? getPkgName(packageJson.name)
      : entryName)

  if (!name)
    throw new Error(
      'Name in package.json is required if option "build.lib.fileName" is not provided.',
    )

  extension ??= resolveOutputJsExtension(format, packageJson?.type)

  if (format === 'cjs' || format === 'es') {
    return `${name}.${extension}`
  }

  return `${name}.${format}.${extension}`
}

export function resolveBuildOutputs(
  outputs: OutputOptions | OutputOptions[] | undefined,
  libOptions: LibraryOptions | false,
  logger: Logger,
): OutputOptions | OutputOptions[] | undefined {
  if (libOptions) {
    const libHasMultipleEntries =
      typeof libOptions.entry !== 'string' &&
      Object.values(libOptions.entry).length > 1
    const libFormats =
      libOptions.formats ||
      (libHasMultipleEntries ? ['es', 'cjs'] : ['es', 'umd'])

    if (!Array.isArray(outputs)) {
      if (libFormats.includes('umd') || libFormats.includes('iife')) {
        if (libHasMultipleEntries) {
          throw new Error(
            'Multiple entry points are not supported when output formats include "umd" or "iife".',
          )
        }

        if (!libOptions.name) {
          throw new Error(
            'Option "build.lib.name" is required when output formats include "umd" or "iife".',
          )
        }
      }

      return libFormats.map((format) => ({ ...outputs, format }))
    }

    // By this point, we know "outputs" is an Array.
    if (libOptions.formats) {
      logger.warn(
        colors.yellow(
          '"build.lib.formats" will be ignored because "build.rollupOptions.output" is already an array format.',
        ),
      )
    }

    outputs.forEach((output) => {
      if (['umd', 'iife'].includes(output.format!) && !output.name) {
        throw new Error(
          'Entries in "build.rollupOptions.output" must specify "name" when the format is "umd" or "iife".',
        )
      }
    })
  }

  return outputs
}

const warningIgnoreList = [`CIRCULAR_DEPENDENCY`, `THIS_IS_UNDEFINED`]
const dynamicImportWarningIgnoreList = [
  `Unsupported expression`,
  `statically analyzed`,
]

function clearLine() {
  const tty = process.stdout.isTTY && !process.env.CI
  if (tty) {
    process.stdout.clearLine(0)
    process.stdout.cursorTo(0)
  }
}

export function onRollupWarning(
  warning: RollupLog,
  warn: LoggingFunction,
  config: ResolvedConfig,
): void {
  const viteWarn: LoggingFunction = (warnLog) => {
    let warning: string | RollupLog

    if (typeof warnLog === 'function') {
      warning = warnLog()
    } else {
      warning = warnLog
    }

    if (typeof warning === 'object') {
      if (warning.code === 'UNRESOLVED_IMPORT') {
        const id = warning.id
        const exporter = warning.exporter
        // throw unless it's commonjs external...
        if (!id || !id.endsWith('?commonjs-external')) {
          throw new Error(
            `[vite]: Rollup failed to resolve import "${exporter}" from "${id}".\n` +
              `This is most likely unintended because it can break your application at runtime.\n` +
              `If you do want to externalize this module explicitly add it to\n` +
              `\`build.rollupOptions.external\``,
          )
        }
      }

      if (
        warning.plugin === 'rollup-plugin-dynamic-import-variables' &&
        dynamicImportWarningIgnoreList.some((msg) =>
          // @ts-expect-error warning is RollupLog
          warning.message.includes(msg),
        )
      ) {
        return
      }

      if (warningIgnoreList.includes(warning.code!)) {
        return
      }

      if (warning.code === 'PLUGIN_WARNING') {
        config.logger.warn(
          `${colors.bold(
            colors.yellow(`[plugin:${warning.plugin}]`),
          )} ${colors.yellow(warning.message)}`,
        )
        return
      }
    }

    warn(warnLog)
  }

  clearLine()
  const userOnWarn = config.build.rollupOptions?.onwarn
  if (userOnWarn) {
    userOnWarn(warning, viteWarn)
  } else {
    viteWarn(warning)
  }
}

export function resolveUserExternal(
  user: ExternalOption,
  id: string,
  parentId: string | undefined,
  isResolved: boolean,
): boolean | null | void {
  if (typeof user === 'function') {
    return user(id, parentId, isResolved)
  } else if (Array.isArray(user)) {
    return user.some((test) => isExternal(id, test))
  } else {
    return isExternal(id, user)
  }
}

function isExternal(id: string, test: string | RegExp) {
  if (typeof test === 'string') {
    return id === test
  } else {
    return test.test(id)
  }
}

function injectSsrFlagToHooks(plugin: Plugin): Plugin {
  const { resolveId, load, transform } = plugin
  return {
    ...plugin,
    resolveId: wrapSsrResolveId(resolveId),
    load: wrapSsrLoad(load),
    transform: wrapSsrTransform(transform),
  }
}

function wrapSsrResolveId(hook?: Plugin['resolveId']): Plugin['resolveId'] {
  if (!hook) return

  const fn = getHookHandler(hook)
  const handler: Plugin['resolveId'] = function (id, importer, options) {
    return fn.call(this, id, importer, injectSsrFlag(options))
  }

  if ('handler' in hook) {
    return {
      ...hook,
      handler,
    } as Plugin['resolveId']
  } else {
    return handler
  }
}

function wrapSsrLoad(hook?: Plugin['load']): Plugin['load'] {
  if (!hook) return

  const fn = getHookHandler(hook)
  const handler: Plugin['load'] = function (id, ...args) {
    // @ts-expect-error: Receiving options param to be future-proof if Rollup adds it
    return fn.call(this, id, injectSsrFlag(args[0]))
  }

  if ('handler' in hook) {
    return {
      ...hook,
      handler,
    } as Plugin['load']
  } else {
    return handler
  }
}

function wrapSsrTransform(hook?: Plugin['transform']): Plugin['transform'] {
  if (!hook) return

  const fn = getHookHandler(hook)
  const handler: Plugin['transform'] = function (code, importer, ...args) {
    // @ts-expect-error: Receiving options param to be future-proof if Rollup adds it
    return fn.call(this, code, importer, injectSsrFlag(args[0]))
  }

  if ('handler' in hook) {
    return {
      ...hook,
      handler,
    } as Plugin['transform']
  } else {
    return handler
  }
}

function injectSsrFlag<T extends Record<string, any>>(
  options?: T,
): T & { ssr: boolean } {
  return { ...(options ?? {}), ssr: true } as T & { ssr: boolean }
}

/*
  The following functions are copied from rollup
  https://github.com/rollup/rollup/blob/0bcf0a672ac087ff2eb88fbba45ec62389a4f45f/src/ast/nodes/MetaProperty.ts#L145-L193

  https://github.com/rollup/rollup
  The MIT License (MIT)
  Copyright (c) 2017 [these people](https://github.com/rollup/rollup/graphs/contributors)
  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
const needsEscapeRegEx = /[\n\r'\\\u2028\u2029]/
const quoteNewlineRegEx = /([\n\r'\u2028\u2029])/g
const backSlashRegEx = /\\/g

function escapeId(id: string): string {
  if (!needsEscapeRegEx.test(id)) return id
  return id.replace(backSlashRegEx, '\\\\').replace(quoteNewlineRegEx, '\\$1')
}

const getResolveUrl = (path: string, URL = 'URL') => `new ${URL}(${path}).href`

const getRelativeUrlFromDocument = (relativePath: string, umd = false) =>
  getResolveUrl(
    `'${escapeId(relativePath)}', ${
      umd ? `typeof document === 'undefined' ? location.href : ` : ''
    }document.currentScript && document.currentScript.src || document.baseURI`,
  )

const getFileUrlFromFullPath = (path: string) =>
  `require('u' + 'rl').pathToFileURL(${path}).href`

const getFileUrlFromRelativePath = (path: string) =>
  getFileUrlFromFullPath(`__dirname + '/${path}'`)

const relativeUrlMechanisms: Record<
  InternalModuleFormat,
  (relativePath: string) => string
> = {
  amd: (relativePath) => {
    if (relativePath[0] !== '.') relativePath = './' + relativePath
    return getResolveUrl(`require.toUrl('${relativePath}'), document.baseURI`)
  },
  cjs: (relativePath) =>
    `(typeof document === 'undefined' ? ${getFileUrlFromRelativePath(
      relativePath,
    )} : ${getRelativeUrlFromDocument(relativePath)})`,
  es: (relativePath) => getResolveUrl(`'${relativePath}', import.meta.url`),
  iife: (relativePath) => getRelativeUrlFromDocument(relativePath),
  // NOTE: make sure rollup generate `module` params
  system: (relativePath) => getResolveUrl(`'${relativePath}', module.meta.url`),
  umd: (relativePath) =>
    `(typeof document === 'undefined' && typeof location === 'undefined' ? ${getFileUrlFromRelativePath(
      relativePath,
    )} : ${getRelativeUrlFromDocument(relativePath, true)})`,
}
/* end of copy */

const customRelativeUrlMechanisms = {
  ...relativeUrlMechanisms,
  'worker-iife': (relativePath) =>
    getResolveUrl(`'${relativePath}', self.location.href`),
} as const satisfies Record<string, (relativePath: string) => string>

export type RenderBuiltAssetUrl = (
  filename: string,
  type: {
    type: 'asset' | 'public'
    hostId: string
    hostType: 'js' | 'css' | 'html'
    ssr: boolean
  },
) => string | { relative?: boolean; runtime?: string } | undefined

export function toOutputFilePathInJS(
  filename: string,
  type: 'asset' | 'public',
  hostId: string,
  hostType: 'js' | 'css' | 'html',
  config: ResolvedConfig,
  toRelative: (
    filename: string,
    hostType: string,
  ) => string | { runtime: string },
): string | { runtime: string } {
  const { renderBuiltUrl } = config.experimental
  let relative = config.base === '' || config.base === './'
  if (renderBuiltUrl) {
    const result = renderBuiltUrl(filename, {
      hostId,
      hostType,
      type,
      ssr: !!config.build.ssr,
    })
    if (typeof result === 'object') {
      if (result.runtime) {
        return { runtime: result.runtime }
      }
      if (typeof result.relative === 'boolean') {
        relative = result.relative
      }
    } else if (result) {
      return result
    }
  }
  if (relative && !config.build.ssr) {
    return toRelative(filename, hostId)
  }
  return joinUrlSegments(config.base, filename)
}

export function createToImportMetaURLBasedRelativeRuntime(
  format: InternalModuleFormat,
  isWorker: boolean,
): (filename: string, importer: string) => { runtime: string } {
  const formatLong = isWorker && format === 'iife' ? 'worker-iife' : format
  const toRelativePath = customRelativeUrlMechanisms[formatLong]
  return (filename, importer) => ({
    runtime: toRelativePath(
      path.posix.relative(path.dirname(importer), filename),
    ),
  })
}

export function toOutputFilePathWithoutRuntime(
  filename: string,
  type: 'asset' | 'public',
  hostId: string,
  hostType: 'js' | 'css' | 'html',
  config: ResolvedConfig,
  toRelative: (filename: string, hostId: string) => string,
): string {
  const { renderBuiltUrl } = config.experimental
  let relative = config.base === '' || config.base === './'
  if (renderBuiltUrl) {
    const result = renderBuiltUrl(filename, {
      hostId,
      hostType,
      type,
      ssr: !!config.build.ssr,
    })
    if (typeof result === 'object') {
      if (result.runtime) {
        throw new Error(
          `{ runtime: "${result.runtime}" } is not supported for assets in ${hostType} files: ${filename}`,
        )
      }
      if (typeof result.relative === 'boolean') {
        relative = result.relative
      }
    } else if (result) {
      return result
    }
  }
  if (relative && !config.build.ssr) {
    return toRelative(filename, hostId)
  } else {
    return joinUrlSegments(config.base, filename)
  }
}

export const toOutputFilePathInCss = toOutputFilePathWithoutRuntime
export const toOutputFilePathInHtml = toOutputFilePathWithoutRuntime

function areSeparateFolders(a: string, b: string) {
  const na = normalizePath(a)
  const nb = normalizePath(b)
  return (
    na !== nb &&
    !na.startsWith(withTrailingSlash(nb)) &&
    !nb.startsWith(withTrailingSlash(na))
  )
}