build.ts

import fs from 'node:fs'
import path from 'node:path'
import colors from 'picocolors'
import type {
  ExternalOption,
  InternalModuleFormat,
  ModuleFormat,
  OutputOptions,
  Plugin,
  RollupBuild,
  RollupError,
  RollupOptions,
  RollupOutput,
  RollupWarning,
  RollupWatcher,
  WarningHandler,
  WatcherOptions
} from 'rollup'
import type { Terser } from 'types/terser'
import commonjsPlugin from '@rollup/plugin-commonjs'
import type { RollupCommonJSOptions } from 'types/commonjs'
import type { RollupDynamicImportVarsOptions } from '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 { terserPlugin } from './plugins/terser'
import { copyDir, emptyDir, lookupFile, normalizePath } from './utils'
import { manifestPlugin } from './plugins/manifest'
import type { Logger } from './logger'
import { dataURIPlugin } from './plugins/dataUri'
import { buildImportAnalysisPlugin } from './plugins/importAnalysisBuild'
import {
  cjsShouldExternalizeForSSR,
  cjsSsrResolveExternals
} from './ssr/ssrExternal'
import { ssrManifestPlugin } from './ssr/ssrManifestPlugin'
import type { DepOptimizationMetadata } from './optimizer'
import {
  findKnownImports,
  getDepsCacheDir,
  initDepsOptimizer
} from './optimizer'
import { assetImportMetaUrlPlugin } from './plugins/assetImportMetaUrl'
import { loadFallbackPlugin } from './plugins/loadFallback'
import type { PackageData } from './packages'
import { watchPackageDataPlugin } from './packages'
import { ensureWatchPlugin } from './plugins/ensureWatch'
import { ESBUILD_MODULES_TARGET, VERSION } from './constants'
import { resolveChokidarOptions } from './watch'
import { completeSystemWrapPlugin } from './plugins/completeSystemWrap'

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.
   */
  target?: 'modules' | TransformOptions['target'] | false
  /**
   * whether to inject module preload polyfill.
   * Note: does not apply to library mode.
   * @default true
   */
  polyfillModulePreload?: boolean
  /**
   * 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` (4kb). Set to `0` to disable.
   * @default 4096
   */
  assetsInlineLimit?: number
  /**
   * 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.
   */
  cssTarget?: TransformOptions['target'] | false
  /**
   * 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
   */
  terserOptions?: Terser.MinifyOptions
  /**
   * Will be merged with internal rollup options.
   * https://rollupjs.org/guide/en/#big-list-of-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
  /**
   * Whether to emit a 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.
   */
  lib?: LibraryOptions | false
  /**
   * Produce SSR oriented build. Note this requires specifying SSR entry via
   * `rollupOptions.input`.
   */
  ssr?: boolean | string
  /**
   * Generate SSR manifest for determining style links and asset preload
   * directives in production.
   */
  ssrManifest?: boolean | string
  /**
   * Set to false to disable reporting compressed chunk sizes.
   * Can slightly improve build speed.
   */
  reportCompressedSize?: boolean
  /**
   * Adjust chunk size warning limit (in kbs).
   * @default 500
   */
  chunkSizeWarningLimit?: number
  /**
   * Rollup watch options
   * https://rollupjs.org/guide/en/#watchoptions
   */
  watch?: WatcherOptions | null
}

export interface LibraryOptions {
  /**
   * Path of library entry
   */
  entry: string
  /**
   * 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) => string)
}

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

export type ResolvedBuildOptions = Required<BuildOptions>

export function resolveBuildOptions(
  raw: BuildOptions | undefined,
  isBuild: boolean,
  logger: Logger
): ResolvedBuildOptions {
  const resolved: ResolvedBuildOptions = {
    target: 'modules',
    polyfillModulePreload: true,
    outDir: 'dist',
    assetsDir: 'assets',
    assetsInlineLimit: 4096,
    cssCodeSplit: !raw?.lib,
    cssTarget: false,
    sourcemap: false,
    rollupOptions: {},
    minify: raw?.ssr ? false : 'esbuild',
    terserOptions: {},
    write: true,
    emptyOutDir: null,
    manifest: false,
    lib: false,
    ssr: false,
    ssrManifest: false,
    reportCompressedSize: true,
    chunkSizeWarningLimit: 500,
    watch: null,
    ...raw,
    commonjsOptions: {
      include: [/node_modules/],
      extensions: ['.js', '.cjs'],
      ...raw?.commonjsOptions
    },
    dynamicImportVarsOptions: {
      warnOnError: true,
      exclude: [/node_modules/],
      ...raw?.dynamicImportVarsOptions
    }
  }

  // handle special build targets
  if (resolved.target === 'modules') {
    resolved.target = ESBUILD_MODULES_TARGET
  } else if (resolved.target === 'esnext' && resolved.minify === 'terser') {
    // esnext + terser: limit to es2021 so it can be minified by terser
    resolved.target = 'es2021'
  }

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

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

  if (resolved.minify === true) {
    resolved.minify = 'esbuild'
  }

  return resolved
}

export function resolveBuildPlugins(config: ResolvedConfig): {
  pre: Plugin[]
  post: Plugin[]
} {
  const options = config.build
  const { commonjsOptions } = options
  const usePluginCommonjs =
    !Array.isArray(commonjsOptions?.include) ||
    commonjsOptions?.include.length !== 0
  return {
    pre: [
      completeSystemWrapPlugin(),
      ...(options.watch ? [ensureWatchPlugin()] : []),
      watchPackageDataPlugin(config),
      ...(usePluginCommonjs ? [commonjsPlugin(options.commonjsOptions)] : []),
      dataURIPlugin(),
      assetImportMetaUrlPlugin(config),
      ...(options.rollupOptions.plugins
        ? (options.rollupOptions.plugins.filter(Boolean) as Plugin[])
        : [])
    ],
    post: [
      buildImportAnalysisPlugin(config),
      ...(config.esbuild !== false ? [buildEsbuildPlugin(config)] : []),
      ...(options.minify ? [terserPlugin(config)] : []),
      ...(options.manifest ? [manifestPlugin(config)] : []),
      ...(options.ssrManifest ? [ssrManifestPlugin(config)] : []),
      buildReporterPlugin(config),
      loadFallbackPlugin()
    ]
  }
}

/**
 * Track parallel build calls and only stop the esbuild service when all
 * builds are done. (#1098)
 */
let parallelCallCounts = 0
// we use a separate counter to track since the call may error before the
// bundle is even pushed.
const parallelBuilds: RollupBuild[] = []

/**
 * Bundles the app for production.
 * Returns a Promise containing the build result.
 */
export async function build(
  inlineConfig: InlineConfig = {}
): Promise<RollupOutput | RollupOutput[] | RollupWatcher> {
  parallelCallCounts++
  try {
    return await doBuild(inlineConfig)
  } finally {
    parallelCallCounts--
    if (parallelCallCounts <= 0) {
      await Promise.all(parallelBuilds.map((bundle) => bundle.close()))
      parallelBuilds.length = 0
    }
  }
}

async function doBuild(
  inlineConfig: InlineConfig = {}
): Promise<RollupOutput | RollupOutput[] | RollupWatcher> {
  const config = await resolveConfig(inlineConfig, 'build', '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)
  let input = libOptions
    ? resolve(libOptions.entry)
    : typeof options.ssr === 'string'
    ? resolve(options.ssr)
    : options.rollupOptions?.input || resolve('index.html')
  if (input === 'index.html') {
    input = resolve(input)
  }
  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.`
    )
  }

  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[]

  const userExternal = options.rollupOptions?.external
  let external = userExternal

  // In CJS, we can pass the externals to rollup as is. In ESM, we need to
  // do it in the resolve plugin so we can add the resolved extension for
  // deep node_modules imports
  if (ssr && config.legacy?.buildSsrCjsExternalHeuristics) {
    external = await cjsSsrResolveExternal(config, userExternal)
  }

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

  const rollupOptions: RollupOptions = {
    context: 'globalThis',
    preserveEntrySignatures: ssr
      ? 'allow-extension'
      : libOptions
      ? 'strict'
      : false,
    ...options.rollupOptions,
    input,
    plugins,
    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)
    }
    config.logger.error(msg, { error: e })
  }

  try {
    const buildOutputOptions = (output: OutputOptions = {}): OutputOptions => {
      // See https://github.com/vitejs/vite/issues/5812#issuecomment-984345618
      // @ts-ignore
      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.`
        )
      }

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

      const format = output.format || (cjsSsrBuild ? 'cjs' : 'es')
      const jsExt =
        ssrNodeBuild || libOptions
          ? resolveOutputJsExtension(format, getPkgJson(config.root)?.type)
          : 'js'
      return {
        dir: outDir,
        // Default format is 'es' for regular and for SSR builds
        format,
        exports: cjsSsrBuild ? 'named' : '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].${jsExt}`
          : libOptions
          ? resolveLibFilename(libOptions, format, config.root, jsExt)
          : path.posix.join(options.assetsDir, `[name].[hash].${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'),
        ...output
      }
    }

    // resolve lib mode outputs
    const outputs = resolveBuildOutputs(
      options.rollupOptions?.output,
      libOptions,
      config.logger
    )

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

      const output: OutputOptions[] = []
      if (Array.isArray(outputs)) {
        for (const resolvedOutput of outputs) {
          output.push(buildOutputOptions(resolvedOutput))
        }
      } else {
        output.push(buildOutputOptions(outputs))
      }

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

      const { watch } = await import('rollup')
      const watcher = watch({
        ...rollupOptions,
        output,
        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(outDir, 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')
    const bundle = await rollup(rollupOptions)
    parallelBuilds.push(bundle)

    const generate = (output: OutputOptions = {}) => {
      return bundle[options.write ? 'write' : 'generate'](
        buildOutputOptions(output)
      )
    }

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

    if (Array.isArray(outputs)) {
      const res = []
      for (const output of outputs) {
        res.push(await generate(output))
      }
      return res
    } else {
      return await generate(outputs)
    }
  } catch (e) {
    outputBuildError(e)
    throw e
  }
}

function prepareOutDir(
  outDir: string,
  emptyOutDir: boolean | null,
  config: ResolvedConfig
) {
  if (fs.existsSync(outDir)) {
    if (
      emptyOutDir == null &&
      !normalizePath(outDir).startsWith(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`
        )
      )
    } else if (emptyOutDir !== false) {
      emptyDir(outDir, ['.git'])
    }
  }
  if (config.publicDir && fs.existsSync(config.publicDir)) {
    copyDir(config.publicDir, outDir)
  }
}

function getPkgJson(root: string): PackageData['data'] {
  return JSON.parse(lookupFile(root, ['package.json']) || `{}`)
}

function getPkgName(name: string) {
  return name?.startsWith('@') ? 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,
  root: string,
  extension?: JsExt
): string {
  if (typeof libOptions.fileName === 'function') {
    return libOptions.fileName(format)
  }

  const packageJson = getPkgJson(root)
  const name = libOptions.fileName || getPkgName(packageJson.name)

  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}`
}

function resolveBuildOutputs(
  outputs: OutputOptions | OutputOptions[] | undefined,
  libOptions: LibraryOptions | false,
  logger: Logger
): OutputOptions | OutputOptions[] | undefined {
  if (libOptions) {
    const formats = libOptions.formats || ['es', 'umd']
    if (
      (formats.includes('umd') || formats.includes('iife')) &&
      !libOptions.name
    ) {
      throw new Error(
        `Option "build.lib.name" is required when output formats ` +
          `include "umd" or "iife".`
      )
    }
    if (!outputs) {
      return formats.map((format) => ({ format }))
    } else if (!Array.isArray(outputs)) {
      return formats.map((format) => ({ ...outputs, format }))
    } else if (libOptions.formats) {
      // user explicitly specifying own output array
      logger.warn(
        colors.yellow(
          `"build.lib.formats" will be ignored because ` +
            `"build.rollupOptions.output" is already an array format`
        )
      )
    }
  }
  return outputs
}

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

export function onRollupWarning(
  warning: RollupWarning,
  warn: WarningHandler,
  config: ResolvedConfig
): void {
  if (warning.code === 'UNRESOLVED_IMPORT') {
    const id = warning.source
    const importer = warning.importer
    // throw unless it's commonjs external...
    if (!importer || !/\?commonjs-external$/.test(importer)) {
      throw new Error(
        `[vite]: Rollup failed to resolve import "${id}" from "${importer}".\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) => warning.message.includes(msg))
  ) {
    return
  }

  if (!warningIgnoreList.includes(warning.code!)) {
    const userOnWarn = config.build.rollupOptions?.onwarn
    if (userOnWarn) {
      userOnWarn(warning, warn)
    } else if (warning.code === 'PLUGIN_WARNING') {
      config.logger.warn(
        `${colors.bold(
          colors.yellow(`[plugin:${warning.plugin}]`)
        )} ${colors.yellow(warning.message)}`
      )
    } else {
      warn(warning)
    }
  }
}

async function cjsSsrResolveExternal(
  config: ResolvedConfig,
  user: ExternalOption | undefined
): Promise<ExternalOption> {
  // see if we have cached deps data available
  let knownImports: string[] | undefined
  const dataPath = path.join(getDepsCacheDir(config, false), '_metadata.json')
  try {
    const data = JSON.parse(
      fs.readFileSync(dataPath, 'utf-8')
    ) as DepOptimizationMetadata
    knownImports = Object.keys(data.optimized)
  } catch (e) {}
  if (!knownImports) {
    // no dev deps optimization data, do a fresh scan
    knownImports = await findKnownImports(config, false) // needs to use non-ssr
  }
  const ssrExternals = cjsSsrResolveExternals(config, knownImports)

  return (id, parentId, isResolved) => {
    const isExternal = cjsShouldExternalizeForSSR(id, ssrExternals)
    if (isExternal) {
      return true
    }
    if (user) {
      return resolveUserExternal(user, id, parentId, isResolved)
    }
  }
}

function resolveUserExternal(
  user: ExternalOption,
  id: string,
  parentId: string | undefined,
  isResolved: boolean
) {
  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 = 'handler' in hook ? hook.handler : 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 = 'handler' in hook ? hook.handler : 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 = 'handler' in hook ? hook.handler : 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/c5269747cd3dd14c4b306e8cea36f248d9c1aa01/src/ast/nodes/MetaProperty.ts#L189-L232

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

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

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' ? ${getResolveUrl(
      `'file:' + __dirname + '/${relativePath}'`,
      `(require('u' + 'rl').URL)`
    )} : ${getRelativeUrlFromDocument(relativePath)})`,
  es: (relativePath) => getResolveUrl(`'${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' ? ${getResolveUrl(
      `'file:' + __dirname + '/${relativePath}'`,
      `(require('u' + 'rl').URL)`
    )} : ${getRelativeUrlFromDocument(relativePath, true)})`
}
/* end of copy */

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 toOutputFilePathInString(
  filename: string,
  type: 'asset' | 'public',
  hostId: string,
  hostType: 'js' | 'css' | 'html',
  config: ResolvedConfig,
  format: InternalModuleFormat,
  toRelative: (
    filename: string,
    hostType: string
  ) => string | { runtime: string } = getToImportMetaURLBasedRelativePath(
    format
  )
): 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 config.base + filename
}

function getToImportMetaURLBasedRelativePath(
  format: InternalModuleFormat
): (filename: string, importer: string) => { runtime: string } {
  const toRelativePath = relativeUrlMechanisms[format]
  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 config.base + filename
  }
}

export const toOutputFilePathInCss = toOutputFilePathWithoutRuntime
export const toOutputFilePathInHtml = toOutputFilePathWithoutRuntime