utils.ts

import fs from 'node:fs'
import os from 'node:os'
import path from 'node:path'
import { exec } from 'node:child_process'
import { createHash } from 'node:crypto'
import { URL, URLSearchParams, fileURLToPath } from 'node:url'
import { builtinModules, createRequire } from 'node:module'
import { promises as dns } from 'node:dns'
import { performance } from 'node:perf_hooks'
import type { AddressInfo, Server } from 'node:net'
import type { FSWatcher } from 'chokidar'
import remapping from '@ampproject/remapping'
import type { DecodedSourceMap, RawSourceMap } from '@ampproject/remapping'
import colors from 'picocolors'
import debug from 'debug'
import type { Alias, AliasOptions } from 'dep-types/alias'
import type MagicString from 'magic-string'

import type { TransformResult } from 'rollup'
import { createFilter as _createFilter } from '@rollup/pluginutils'
import {
  CLIENT_ENTRY,
  CLIENT_PUBLIC_PATH,
  ENV_PUBLIC_PATH,
  FS_PREFIX,
  NULL_BYTE_PLACEHOLDER,
  OPTIMIZABLE_ENTRY_RE,
  VALID_ID_PREFIX,
  loopbackHosts,
  wildcardHosts,
} from './constants'
import type { DepOptimizationConfig } from './optimizer'
import type { ResolvedConfig } from './config'
import type { ResolvedServerUrls, ViteDevServer } from './server'
import { resolvePackageData } from './packages'
import type { CommonServerOptions } from '.'

/**
 * Inlined to keep `@rollup/pluginutils` in devDependencies
 */
export type FilterPattern =
  | ReadonlyArray<string | RegExp>
  | string
  | RegExp
  | null
export const createFilter = _createFilter as (
  include?: FilterPattern,
  exclude?: FilterPattern,
  options?: { resolve?: string | false | null },
) => (id: string | unknown) => boolean

const windowsSlashRE = /\\/g
export function slash(p: string): string {
  return p.replace(windowsSlashRE, '/')
}

/**
 * Prepend `/@id/` and replace null byte so the id is URL-safe.
 * This is prepended to resolved ids that are not valid browser
 * import specifiers by the importAnalysis plugin.
 */
export function wrapId(id: string): string {
  return id.startsWith(VALID_ID_PREFIX)
    ? id
    : VALID_ID_PREFIX + id.replace('\0', NULL_BYTE_PLACEHOLDER)
}

/**
 * Undo {@link wrapId}'s `/@id/` and null byte replacements.
 */
export function unwrapId(id: string): string {
  return id.startsWith(VALID_ID_PREFIX)
    ? id.slice(VALID_ID_PREFIX.length).replace(NULL_BYTE_PLACEHOLDER, '\0')
    : id
}

const replaceSlashOrColonRE = /[/:]/g
const replaceDotRE = /\./g
const replaceNestedIdRE = /(\s*>\s*)/g
const replaceHashRE = /#/g
export const flattenId = (id: string): string =>
  id
    .replace(replaceSlashOrColonRE, '_')
    .replace(replaceDotRE, '__')
    .replace(replaceNestedIdRE, '___')
    .replace(replaceHashRE, '____')

export const normalizeId = (id: string): string =>
  id.replace(replaceNestedIdRE, ' > ')

//TODO: revisit later to see if the edge case that "compiling using node v12 code to be run in node v16 in the server" is what we intend to support.
const builtins = new Set([
  ...builtinModules,
  'assert/strict',
  'diagnostics_channel',
  'dns/promises',
  'fs/promises',
  'path/posix',
  'path/win32',
  'readline/promises',
  'stream/consumers',
  'stream/promises',
  'stream/web',
  'timers/promises',
  'util/types',
  'wasi',
])

const NODE_BUILTIN_NAMESPACE = 'node:'
export function isBuiltin(id: string): boolean {
  return builtins.has(
    id.startsWith(NODE_BUILTIN_NAMESPACE)
      ? id.slice(NODE_BUILTIN_NAMESPACE.length)
      : id,
  )
}

export function isInNodeModules(id: string): boolean {
  return id.includes('node_modules')
}

export function moduleListContains(
  moduleList: string[] | undefined,
  id: string,
): boolean | undefined {
  return moduleList?.some((m) => m === id || id.startsWith(m + '/'))
}

export function isOptimizable(
  id: string,
  optimizeDeps: DepOptimizationConfig,
): boolean {
  const { extensions } = optimizeDeps
  return (
    OPTIMIZABLE_ENTRY_RE.test(id) ||
    (extensions?.some((ext) => id.endsWith(ext)) ?? false)
  )
}

export const bareImportRE = /^[\w@](?!.*:\/\/)/
export const deepImportRE = /^([^@][^/]*)\/|^(@[^/]+\/[^/]+)\//

// TODO: use import()
const _require = createRequire(import.meta.url)

// set in bin/vite.js
const filter = process.env.VITE_DEBUG_FILTER

const DEBUG = process.env.DEBUG

interface DebuggerOptions {
  onlyWhenFocused?: boolean | string
}

export type ViteDebugScope = `vite:${string}`

export function createDebugger(
  namespace: ViteDebugScope,
  options: DebuggerOptions = {},
): debug.Debugger['log'] | undefined {
  const log = debug(namespace)
  const { onlyWhenFocused } = options

  let enabled = log.enabled
  if (enabled && onlyWhenFocused) {
    const ns = typeof onlyWhenFocused === 'string' ? onlyWhenFocused : namespace
    enabled = !!DEBUG?.includes(ns)
  }

  if (enabled) {
    return (...args: [string, ...any[]]) => {
      if (!filter || args.some((a) => a?.includes?.(filter))) {
        log(...args)
      }
    }
  }
}

function testCaseInsensitiveFS() {
  if (!CLIENT_ENTRY.endsWith('client.mjs')) {
    throw new Error(
      `cannot test case insensitive FS, CLIENT_ENTRY const doesn't contain client.mjs`,
    )
  }
  if (!fs.existsSync(CLIENT_ENTRY)) {
    throw new Error(
      'cannot test case insensitive FS, CLIENT_ENTRY does not point to an existing file: ' +
        CLIENT_ENTRY,
    )
  }
  return fs.existsSync(CLIENT_ENTRY.replace('client.mjs', 'cLiEnT.mjs'))
}

export function isUrl(path: string): boolean {
  try {
    new URL(path)
    return true
  } catch {
    return false
  }
}

export const isCaseInsensitiveFS = testCaseInsensitiveFS()

export const isWindows = os.platform() === 'win32'

const VOLUME_RE = /^[A-Z]:/i

export function normalizePath(id: string): string {
  return path.posix.normalize(isWindows ? slash(id) : id)
}

export function fsPathFromId(id: string): string {
  const fsPath = normalizePath(
    id.startsWith(FS_PREFIX) ? id.slice(FS_PREFIX.length) : id,
  )
  return fsPath[0] === '/' || fsPath.match(VOLUME_RE) ? fsPath : `/${fsPath}`
}

export function fsPathFromUrl(url: string): string {
  return fsPathFromId(cleanUrl(url))
}

/**
 * Check if dir is a parent of file
 *
 * Warning: parameters are not validated, only works with normalized absolute paths
 *
 * @param dir - normalized absolute path
 * @param file - normalized absolute path
 * @returns true if dir is a parent of file
 */
export function isParentDirectory(dir: string, file: string): boolean {
  if (dir[dir.length - 1] !== '/') {
    dir = `${dir}/`
  }
  return (
    file.startsWith(dir) ||
    (isCaseInsensitiveFS && file.toLowerCase().startsWith(dir.toLowerCase()))
  )
}

export const queryRE = /\?.*$/s

const postfixRE = /[?#].*$/s
export function cleanUrl(url: string): string {
  return url.replace(postfixRE, '')
}

export const externalRE = /^(https?:)?\/\//
export const isExternalUrl = (url: string): boolean => externalRE.test(url)

export const dataUrlRE = /^\s*data:/i
export const isDataUrl = (url: string): boolean => dataUrlRE.test(url)

export const virtualModuleRE = /^virtual-module:.*/
export const virtualModulePrefix = 'virtual-module:'

const knownJsSrcRE = /\.(?:[jt]sx?|m[jt]s|vue|marko|svelte|astro|imba)(?:$|\?)/
export const isJSRequest = (url: string): boolean => {
  url = cleanUrl(url)
  if (knownJsSrcRE.test(url)) {
    return true
  }
  if (!path.extname(url) && url[url.length - 1] !== '/') {
    return true
  }
  return false
}

const knownTsRE = /\.(?:ts|mts|cts|tsx)(?:$|\?)/
export const isTsRequest = (url: string): boolean => knownTsRE.test(url)

const importQueryRE = /(\?|&)import=?(?:&|$)/
const directRequestRE = /(\?|&)direct=?(?:&|$)/
const internalPrefixes = [
  FS_PREFIX,
  VALID_ID_PREFIX,
  CLIENT_PUBLIC_PATH,
  ENV_PUBLIC_PATH,
]
const InternalPrefixRE = new RegExp(`^(?:${internalPrefixes.join('|')})`)
const trailingSeparatorRE = /[?&]$/
export const isImportRequest = (url: string): boolean => importQueryRE.test(url)
export const isInternalRequest = (url: string): boolean =>
  InternalPrefixRE.test(url)

export function removeImportQuery(url: string): string {
  return url.replace(importQueryRE, '$1').replace(trailingSeparatorRE, '')
}
export function removeDirectQuery(url: string): string {
  return url.replace(directRequestRE, '$1').replace(trailingSeparatorRE, '')
}

const replacePercentageRE = /%/g
export function injectQuery(url: string, queryToInject: string): string {
  // encode percents for consistent behavior with pathToFileURL
  // see #2614 for details
  const resolvedUrl = new URL(
    url.replace(replacePercentageRE, '%25'),
    'relative:///',
  )
  const { search, hash } = resolvedUrl
  let pathname = cleanUrl(url)
  pathname = isWindows ? slash(pathname) : pathname
  return `${pathname}?${queryToInject}${search ? `&` + search.slice(1) : ''}${
    hash ?? ''
  }`
}

const timestampRE = /\bt=\d{13}&?\b/
export function removeTimestampQuery(url: string): string {
  return url.replace(timestampRE, '').replace(trailingSeparatorRE, '')
}

export async function asyncReplace(
  input: string,
  re: RegExp,
  replacer: (match: RegExpExecArray) => string | Promise<string>,
): Promise<string> {
  let match: RegExpExecArray | null
  let remaining = input
  let rewritten = ''
  while ((match = re.exec(remaining))) {
    rewritten += remaining.slice(0, match.index)
    rewritten += await replacer(match)
    remaining = remaining.slice(match.index + match[0].length)
  }
  rewritten += remaining
  return rewritten
}

export function timeFrom(start: number, subtract = 0): string {
  const time: number | string = performance.now() - start - subtract
  const timeString = (time.toFixed(2) + `ms`).padEnd(5, ' ')
  if (time < 10) {
    return colors.green(timeString)
  } else if (time < 50) {
    return colors.yellow(timeString)
  } else {
    return colors.red(timeString)
  }
}

/**
 * pretty url for logging.
 */
export function prettifyUrl(url: string, root: string): string {
  url = removeTimestampQuery(url)
  const isAbsoluteFile = url.startsWith(root)
  if (isAbsoluteFile || url.startsWith(FS_PREFIX)) {
    const file = path.relative(root, isAbsoluteFile ? url : fsPathFromId(url))
    return colors.dim(file)
  } else {
    return colors.dim(url)
  }
}

export function isObject(value: unknown): value is Record<string, any> {
  return Object.prototype.toString.call(value) === '[object Object]'
}

export function isDefined<T>(value: T | undefined | null): value is T {
  return value != null
}

export function tryStatSync(file: string): fs.Stats | undefined {
  try {
    return fs.statSync(file, { throwIfNoEntry: false })
  } catch {
    // Ignore errors
  }
}

export function lookupFile(
  dir: string,
  fileNames: string[],
): string | undefined {
  while (dir) {
    for (const fileName of fileNames) {
      const fullPath = path.join(dir, fileName)
      if (tryStatSync(fullPath)?.isFile()) return fullPath
    }
    const parentDir = path.dirname(dir)
    if (parentDir === dir) return

    dir = parentDir
  }
}

const splitRE = /\r?\n/

const range: number = 2

export function pad(source: string, n = 2): string {
  const lines = source.split(splitRE)
  return lines.map((l) => ` `.repeat(n) + l).join(`\n`)
}

export function posToNumber(
  source: string,
  pos: number | { line: number; column: number },
): number {
  if (typeof pos === 'number') return pos
  const lines = source.split(splitRE)
  const { line, column } = pos
  let start = 0
  for (let i = 0; i < line - 1 && i < lines.length; i++) {
    start += lines[i].length + 1
  }
  return start + column
}

export function numberToPos(
  source: string,
  offset: number | { line: number; column: number },
): { line: number; column: number } {
  if (typeof offset !== 'number') return offset
  if (offset > source.length) {
    throw new Error(
      `offset is longer than source length! offset ${offset} > length ${source.length}`,
    )
  }
  const lines = source.split(splitRE)
  let counted = 0
  let line = 0
  let column = 0
  for (; line < lines.length; line++) {
    const lineLength = lines[line].length + 1
    if (counted + lineLength >= offset) {
      column = offset - counted + 1
      break
    }
    counted += lineLength
  }
  return { line: line + 1, column }
}

export function generateCodeFrame(
  source: string,
  start: number | { line: number; column: number } = 0,
  end?: number,
): string {
  start = posToNumber(source, start)
  end = end || start
  const lines = source.split(splitRE)
  let count = 0
  const res: string[] = []
  for (let i = 0; i < lines.length; i++) {
    count += lines[i].length + 1
    if (count >= start) {
      for (let j = i - range; j <= i + range || end > count; j++) {
        if (j < 0 || j >= lines.length) continue
        const line = j + 1
        res.push(
          `${line}${' '.repeat(Math.max(3 - String(line).length, 0))}|  ${
            lines[j]
          }`,
        )
        const lineLength = lines[j].length
        if (j === i) {
          // push underline
          const pad = Math.max(start - (count - lineLength) + 1, 0)
          const length = Math.max(
            1,
            end > count ? lineLength - pad : end - start,
          )
          res.push(`   |  ` + ' '.repeat(pad) + '^'.repeat(length))
        } else if (j > i) {
          if (end > count) {
            const length = Math.max(Math.min(end - count, lineLength), 1)
            res.push(`   |  ` + '^'.repeat(length))
          }
          count += lineLength + 1
        }
      }
      break
    }
  }
  return res.join('\n')
}

export function isFileReadable(filename: string): boolean {
  try {
    // The "throwIfNoEntry" is a performance optimization for cases where the file does not exist
    if (!fs.statSync(filename, { throwIfNoEntry: false })) {
      return false
    }

    // Check if current process has read permission to the file
    fs.accessSync(filename, fs.constants.R_OK)

    return true
  } catch {
    return false
  }
}

const splitFirstDirRE = /(.+?)[\\/](.+)/

/**
 * Delete every file and subdirectory. **The given directory must exist.**
 * Pass an optional `skip` array to preserve files under the root directory.
 */
export function emptyDir(dir: string, skip?: string[]): void {
  const skipInDir: string[] = []
  let nested: Map<string, string[]> | null = null
  if (skip?.length) {
    for (const file of skip) {
      if (path.dirname(file) !== '.') {
        const matched = file.match(splitFirstDirRE)
        if (matched) {
          nested ??= new Map()
          const [, nestedDir, skipPath] = matched
          let nestedSkip = nested.get(nestedDir)
          if (!nestedSkip) {
            nestedSkip = []
            nested.set(nestedDir, nestedSkip)
          }
          if (!nestedSkip.includes(skipPath)) {
            nestedSkip.push(skipPath)
          }
        }
      } else {
        skipInDir.push(file)
      }
    }
  }
  for (const file of fs.readdirSync(dir)) {
    if (skipInDir.includes(file)) {
      continue
    }
    if (nested?.has(file)) {
      emptyDir(path.resolve(dir, file), nested.get(file))
    } else {
      fs.rmSync(path.resolve(dir, file), { recursive: true, force: true })
    }
  }
}

export function copyDir(srcDir: string, destDir: string): void {
  fs.mkdirSync(destDir, { recursive: true })
  for (const file of fs.readdirSync(srcDir)) {
    const srcFile = path.resolve(srcDir, file)
    if (srcFile === destDir) {
      continue
    }
    const destFile = path.resolve(destDir, file)
    const stat = fs.statSync(srcFile)
    if (stat.isDirectory()) {
      copyDir(srcFile, destFile)
    } else {
      fs.copyFileSync(srcFile, destFile)
    }
  }
}

// `fs.realpathSync.native` resolves differently in Windows network drive,
// causing file read errors. skip for now.
// https://github.com/nodejs/node/issues/37737
export let safeRealpathSync = isWindows
  ? windowsSafeRealPathSync
  : fs.realpathSync.native

// Based on https://github.com/larrybahr/windows-network-drive
// MIT License, Copyright (c) 2017 Larry Bahr
const windowsNetworkMap = new Map()
function windowsMappedRealpathSync(path: string) {
  const realPath = fs.realpathSync.native(path)
  if (realPath.startsWith('\\\\')) {
    for (const [network, volume] of windowsNetworkMap) {
      if (realPath.startsWith(network)) return realPath.replace(network, volume)
    }
  }
  return realPath
}
const parseNetUseRE = /^(\w+)? +(\w:) +([^ ]+)\s/
let firstSafeRealPathSyncRun = false

function windowsSafeRealPathSync(path: string): string {
  if (!firstSafeRealPathSyncRun) {
    optimizeSafeRealPathSync()
    firstSafeRealPathSyncRun = true
  }
  return fs.realpathSync(path)
}

function optimizeSafeRealPathSync() {
  // Skip if using Node <16.18 due to MAX_PATH issue: https://github.com/vitejs/vite/issues/12931
  const nodeVersion = process.versions.node.split('.').map(Number)
  if (nodeVersion[0] < 16 || (nodeVersion[0] === 16 && nodeVersion[1] < 18)) {
    safeRealpathSync = fs.realpathSync
    return
  }

  exec('net use', (error, stdout) => {
    if (error) return
    const lines = stdout.split('\n')
    // OK           Y:        \\NETWORKA\Foo         Microsoft Windows Network
    // OK           Z:        \\NETWORKA\Bar         Microsoft Windows Network
    for (const line of lines) {
      const m = line.match(parseNetUseRE)
      if (m) windowsNetworkMap.set(m[3], m[2])
    }
    if (windowsNetworkMap.size === 0) {
      safeRealpathSync = fs.realpathSync.native
    } else {
      safeRealpathSync = windowsMappedRealpathSync
    }
  })
}

export function ensureWatchedFile(
  watcher: FSWatcher,
  file: string | null,
  root: string,
): void {
  if (
    file &&
    // only need to watch if out of root
    !file.startsWith(root + '/') &&
    // some rollup plugins use null bytes for private resolved Ids
    !file.includes('\0') &&
    fs.existsSync(file)
  ) {
    // resolve file to normalized system path
    watcher.add(path.resolve(file))
  }
}

interface ImageCandidate {
  url: string
  descriptor: string
}
const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g
const imageSetUrlRE = /^(?:[\w\-]+\(.*?\)|'.*?'|".*?"|\S*)/
function reduceSrcset(ret: { url: string; descriptor: string }[]) {
  return ret.reduce((prev, { url, descriptor }, index) => {
    descriptor ??= ''
    return (prev +=
      url + ` ${descriptor}${index === ret.length - 1 ? '' : ', '}`)
  }, '')
}

function splitSrcSetDescriptor(srcs: string): ImageCandidate[] {
  return splitSrcSet(srcs)
    .map((s) => {
      const src = s.replace(escapedSpaceCharacters, ' ').trim()
      const [url] = imageSetUrlRE.exec(src) || ['']

      return {
        url,
        descriptor: src?.slice(url.length).trim(),
      }
    })
    .filter(({ url }) => !!url)
}

export function processSrcSet(
  srcs: string,
  replacer: (arg: ImageCandidate) => Promise<string>,
): Promise<string> {
  return Promise.all(
    splitSrcSetDescriptor(srcs).map(async ({ url, descriptor }) => ({
      url: await replacer({ url, descriptor }),
      descriptor,
    })),
  ).then((ret) => reduceSrcset(ret))
}

export function processSrcSetSync(
  srcs: string,
  replacer: (arg: ImageCandidate) => string,
): string {
  return reduceSrcset(
    splitSrcSetDescriptor(srcs).map(({ url, descriptor }) => ({
      url: replacer({ url, descriptor }),
      descriptor,
    })),
  )
}

const cleanSrcSetRE =
  /(?:url|image|gradient|cross-fade)\([^)]*\)|"([^"]|(?<=\\)")*"|'([^']|(?<=\\)')*'/g
function splitSrcSet(srcs: string) {
  const parts: string[] = []
  // There could be a ',' inside of url(data:...), linear-gradient(...) or "data:..."
  const cleanedSrcs = srcs.replace(cleanSrcSetRE, blankReplacer)
  let startIndex = 0
  let splitIndex: number
  do {
    splitIndex = cleanedSrcs.indexOf(',', startIndex)
    parts.push(
      srcs.slice(startIndex, splitIndex !== -1 ? splitIndex : undefined),
    )
    startIndex = splitIndex + 1
  } while (splitIndex !== -1)
  return parts
}

const windowsDriveRE = /^[A-Z]:/
const replaceWindowsDriveRE = /^([A-Z]):\//
const linuxAbsolutePathRE = /^\/[^/]/
function escapeToLinuxLikePath(path: string) {
  if (windowsDriveRE.test(path)) {
    return path.replace(replaceWindowsDriveRE, '/windows/$1/')
  }
  if (linuxAbsolutePathRE.test(path)) {
    return `/linux${path}`
  }
  return path
}

const revertWindowsDriveRE = /^\/windows\/([A-Z])\//
function unescapeToLinuxLikePath(path: string) {
  if (path.startsWith('/linux/')) {
    return path.slice('/linux'.length)
  }
  if (path.startsWith('/windows/')) {
    return path.replace(revertWindowsDriveRE, '$1:/')
  }
  return path
}

// based on https://github.com/sveltejs/svelte/blob/abf11bb02b2afbd3e4cac509a0f70e318c306364/src/compiler/utils/mapped_code.ts#L221
const nullSourceMap: RawSourceMap = {
  names: [],
  sources: [],
  mappings: '',
  version: 3,
}
export function combineSourcemaps(
  filename: string,
  sourcemapList: Array<DecodedSourceMap | RawSourceMap>,
  excludeContent = true,
): RawSourceMap {
  if (
    sourcemapList.length === 0 ||
    sourcemapList.every((m) => m.sources.length === 0)
  ) {
    return { ...nullSourceMap }
  }

  // hack for parse broken with normalized absolute paths on windows (C:/path/to/something).
  // escape them to linux like paths
  // also avoid mutation here to prevent breaking plugin's using cache to generate sourcemaps like vue (see #7442)
  sourcemapList = sourcemapList.map((sourcemap) => {
    const newSourcemaps = { ...sourcemap }
    newSourcemaps.sources = sourcemap.sources.map((source) =>
      source ? escapeToLinuxLikePath(source) : null,
    )
    if (sourcemap.sourceRoot) {
      newSourcemaps.sourceRoot = escapeToLinuxLikePath(sourcemap.sourceRoot)
    }
    return newSourcemaps
  })
  const escapedFilename = escapeToLinuxLikePath(filename)

  // We don't declare type here so we can convert/fake/map as RawSourceMap
  let map //: SourceMap
  let mapIndex = 1
  const useArrayInterface =
    sourcemapList.slice(0, -1).find((m) => m.sources.length !== 1) === undefined
  if (useArrayInterface) {
    map = remapping(sourcemapList, () => null, excludeContent)
  } else {
    map = remapping(
      sourcemapList[0],
      function loader(sourcefile) {
        if (sourcefile === escapedFilename && sourcemapList[mapIndex]) {
          return sourcemapList[mapIndex++]
        } else {
          return null
        }
      },
      excludeContent,
    )
  }
  if (!map.file) {
    delete map.file
  }

  // unescape the previous hack
  map.sources = map.sources.map((source) =>
    source ? unescapeToLinuxLikePath(source) : source,
  )
  map.file = filename

  return map as RawSourceMap
}

export function unique<T>(arr: T[]): T[] {
  return Array.from(new Set(arr))
}

/**
 * Returns resolved localhost address when `dns.lookup` result differs from DNS
 *
 * `dns.lookup` result is same when defaultResultOrder is `verbatim`.
 * Even if defaultResultOrder is `ipv4first`, `dns.lookup` result maybe same.
 * For example, when IPv6 is not supported on that machine/network.
 */
export async function getLocalhostAddressIfDiffersFromDNS(): Promise<
  string | undefined
> {
  const [nodeResult, dnsResult] = await Promise.all([
    dns.lookup('localhost'),
    dns.lookup('localhost', { verbatim: true }),
  ])
  const isSame =
    nodeResult.family === dnsResult.family &&
    nodeResult.address === dnsResult.address
  return isSame ? undefined : nodeResult.address
}

export function diffDnsOrderChange(
  oldUrls: ViteDevServer['resolvedUrls'],
  newUrls: ViteDevServer['resolvedUrls'],
): boolean {
  return !(
    oldUrls === newUrls ||
    (oldUrls &&
      newUrls &&
      arrayEqual(oldUrls.local, newUrls.local) &&
      arrayEqual(oldUrls.network, newUrls.network))
  )
}

export interface Hostname {
  /** undefined sets the default behaviour of server.listen */
  host: string | undefined
  /** resolve to localhost when possible */
  name: string
}

export async function resolveHostname(
  optionsHost: string | boolean | undefined,
): Promise<Hostname> {
  let host: string | undefined
  if (optionsHost === undefined || optionsHost === false) {
    // Use a secure default
    host = 'localhost'
  } else if (optionsHost === true) {
    // If passed --host in the CLI without arguments
    host = undefined // undefined typically means 0.0.0.0 or :: (listen on all IPs)
  } else {
    host = optionsHost
  }

  // Set host name to localhost when possible
  let name = host === undefined || wildcardHosts.has(host) ? 'localhost' : host

  if (host === 'localhost') {
    // See #8647 for more details.
    const localhostAddr = await getLocalhostAddressIfDiffersFromDNS()
    if (localhostAddr) {
      name = localhostAddr
    }
  }

  return { host, name }
}

export async function resolveServerUrls(
  server: Server,
  options: CommonServerOptions,
  config: ResolvedConfig,
): Promise<ResolvedServerUrls> {
  const address = server.address()

  const isAddressInfo = (x: any): x is AddressInfo => x?.address
  if (!isAddressInfo(address)) {
    return { local: [], network: [] }
  }

  const local: string[] = []
  const network: string[] = []
  const hostname = await resolveHostname(options.host)
  const protocol = options.https ? 'https' : 'http'
  const port = address.port
  const base =
    config.rawBase === './' || config.rawBase === '' ? '/' : config.rawBase

  if (hostname.host && loopbackHosts.has(hostname.host)) {
    let hostnameName = hostname.name
    // ipv6 host
    if (hostnameName.includes(':')) {
      hostnameName = `[${hostnameName}]`
    }
    local.push(`${protocol}://${hostnameName}:${port}${base}`)
  } else {
    Object.values(os.networkInterfaces())
      .flatMap((nInterface) => nInterface ?? [])
      .filter(
        (detail) =>
          detail &&
          detail.address &&
          (detail.family === 'IPv4' ||
            // @ts-expect-error Node 18.0 - 18.3 returns number
            detail.family === 4),
      )
      .forEach((detail) => {
        let host = detail.address.replace('127.0.0.1', hostname.name)
        // ipv6 host
        if (host.includes(':')) {
          host = `[${host}]`
        }
        const url = `${protocol}://${host}:${port}${base}`
        if (detail.address.includes('127.0.0.1')) {
          local.push(url)
        } else {
          network.push(url)
        }
      })
  }
  return { local, network }
}

export function arraify<T>(target: T | T[]): T[] {
  return Array.isArray(target) ? target : [target]
}

// Taken from https://stackoverflow.com/a/36328890
export const multilineCommentsRE = /\/\*[^*]*\*+(?:[^/*][^*]*\*+)*\//g
export const singlelineCommentsRE = /\/\/.*/g
export const requestQuerySplitRE = /\?(?!.*[/|}])/

// @ts-expect-error jest only exists when running Jest
export const usingDynamicImport = typeof jest === 'undefined'

/**
 * Dynamically import files. It will make sure it's not being compiled away by TS/Rollup.
 *
 * As a temporary workaround for Jest's lack of stable ESM support, we fallback to require
 * if we're in a Jest environment.
 * See https://github.com/vitejs/vite/pull/5197#issuecomment-938054077
 *
 * @param file File path to import.
 */
export const dynamicImport = usingDynamicImport
  ? new Function('file', 'return import(file)')
  : _require

export function parseRequest(id: string): Record<string, string> | null {
  const [_, search] = id.split(requestQuerySplitRE, 2)
  if (!search) {
    return null
  }
  return Object.fromEntries(new URLSearchParams(search))
}

export const blankReplacer = (match: string): string => ' '.repeat(match.length)

export function getHash(text: Buffer | string): string {
  return createHash('sha256').update(text).digest('hex').substring(0, 8)
}

const _dirname = path.dirname(fileURLToPath(import.meta.url))

export const requireResolveFromRootWithFallback = (
  root: string,
  id: string,
): string => {
  // check existence first, so if the package is not found,
  // it won't be cached by nodejs, since there isn't a way to invalidate them:
  // https://github.com/nodejs/node/issues/44663
  const found = resolvePackageData(id, root) || resolvePackageData(id, _dirname)
  if (!found) {
    const error = new Error(`${JSON.stringify(id)} not found.`)
    ;(error as any).code = 'MODULE_NOT_FOUND'
    throw error
  }

  // actually resolve
  // Search in the root directory first, and fallback to the default require paths.
  return _require.resolve(id, { paths: [root, _dirname] })
}

export function emptyCssComments(raw: string): string {
  return raw.replace(multilineCommentsRE, (s) => ' '.repeat(s.length))
}

export function removeComments(raw: string): string {
  return raw.replace(multilineCommentsRE, '').replace(singlelineCommentsRE, '')
}

function mergeConfigRecursively(
  defaults: Record<string, any>,
  overrides: Record<string, any>,
  rootPath: string,
) {
  const merged: Record<string, any> = { ...defaults }
  for (const key in overrides) {
    const value = overrides[key]
    if (value == null) {
      continue
    }

    const existing = merged[key]

    if (existing == null) {
      merged[key] = value
      continue
    }

    // fields that require special handling
    if (key === 'alias' && (rootPath === 'resolve' || rootPath === '')) {
      merged[key] = mergeAlias(existing, value)
      continue
    } else if (key === 'assetsInclude' && rootPath === '') {
      merged[key] = [].concat(existing, value)
      continue
    } else if (
      key === 'noExternal' &&
      rootPath === 'ssr' &&
      (existing === true || value === true)
    ) {
      merged[key] = true
      continue
    }

    if (Array.isArray(existing) || Array.isArray(value)) {
      merged[key] = [...arraify(existing ?? []), ...arraify(value ?? [])]
      continue
    }
    if (isObject(existing) && isObject(value)) {
      merged[key] = mergeConfigRecursively(
        existing,
        value,
        rootPath ? `${rootPath}.${key}` : key,
      )
      continue
    }

    merged[key] = value
  }
  return merged
}

export function mergeConfig(
  defaults: Record<string, any>,
  overrides: Record<string, any>,
  isRoot = true,
): Record<string, any> {
  return mergeConfigRecursively(defaults, overrides, isRoot ? '' : '.')
}

export function mergeAlias(
  a?: AliasOptions,
  b?: AliasOptions,
): AliasOptions | undefined {
  if (!a) return b
  if (!b) return a
  if (isObject(a) && isObject(b)) {
    return { ...a, ...b }
  }
  // the order is flipped because the alias is resolved from top-down,
  // where the later should have higher priority
  return [...normalizeAlias(b), ...normalizeAlias(a)]
}

export function normalizeAlias(o: AliasOptions = []): Alias[] {
  return Array.isArray(o)
    ? o.map(normalizeSingleAlias)
    : Object.keys(o).map((find) =>
        normalizeSingleAlias({
          find,
          replacement: (o as any)[find],
        }),
      )
}

// https://github.com/vitejs/vite/issues/1363
// work around https://github.com/rollup/plugins/issues/759
function normalizeSingleAlias({
  find,
  replacement,
  customResolver,
}: Alias): Alias {
  if (
    typeof find === 'string' &&
    find[find.length - 1] === '/' &&
    replacement[replacement.length - 1] === '/'
  ) {
    find = find.slice(0, find.length - 1)
    replacement = replacement.slice(0, replacement.length - 1)
  }

  const alias: Alias = {
    find,
    replacement,
  }
  if (customResolver) {
    alias.customResolver = customResolver
  }
  return alias
}

/**
 * Transforms transpiled code result where line numbers aren't altered,
 * so we can skip sourcemap generation during dev
 */
export function transformStableResult(
  s: MagicString,
  id: string,
  config: ResolvedConfig,
): TransformResult {
  return {
    code: s.toString(),
    map:
      config.command === 'build' && config.build.sourcemap
        ? s.generateMap({ hires: true, source: id })
        : null,
  }
}

export async function asyncFlatten<T>(arr: T[]): Promise<T[]> {
  do {
    arr = (await Promise.all(arr)).flat(Infinity) as any
  } while (arr.some((v: any) => v?.then))
  return arr
}

// strip UTF-8 BOM
export function stripBomTag(content: string): string {
  if (content.charCodeAt(0) === 0xfeff) {
    return content.slice(1)
  }

  return content
}

const windowsDrivePathPrefixRE = /^[A-Za-z]:[/\\]/

/**
 * path.isAbsolute also returns true for drive relative paths on windows (e.g. /something)
 * this function returns false for them but true for absolute paths (e.g. C:/something)
 */
export const isNonDriveRelativeAbsolutePath = (p: string): boolean => {
  if (!isWindows) return p[0] === '/'
  return windowsDrivePathPrefixRE.test(p)
}

/**
 * Determine if a file is being requested with the correct case, to ensure
 * consistent behaviour between dev and prod and across operating systems.
 */
export function shouldServeFile(filePath: string, root: string): boolean {
  // can skip case check on Linux
  if (!isCaseInsensitiveFS) return true

  return hasCorrectCase(filePath, root)
}

/**
 * Note that we can't use realpath here, because we don't want to follow
 * symlinks.
 */
function hasCorrectCase(file: string, assets: string): boolean {
  if (file === assets) return true

  const parent = path.dirname(file)

  if (fs.readdirSync(parent).includes(path.basename(file))) {
    return hasCorrectCase(parent, assets)
  }

  return false
}

export function joinUrlSegments(a: string, b: string): string {
  if (!a || !b) {
    return a || b || ''
  }
  if (a[a.length - 1] === '/') {
    a = a.substring(0, a.length - 1)
  }
  if (b[0] !== '/') {
    b = '/' + b
  }
  return a + b
}

export function removeLeadingSlash(str: string): string {
  return str[0] === '/' ? str.slice(1) : str
}

export function stripBase(path: string, base: string): string {
  if (path === base) {
    return '/'
  }
  const devBase = base[base.length - 1] === '/' ? base : base + '/'
  return path.startsWith(devBase) ? path.slice(devBase.length - 1) : path
}

export function arrayEqual(a: any[], b: any[]): boolean {
  if (a === b) return true
  if (a.length !== b.length) return false
  for (let i = 0; i < a.length; i++) {
    if (a[i] !== b[i]) return false
  }
  return true
}

export function evalValue<T = any>(rawValue: string): T {
  const fn = new Function(`
    var console, exports, global, module, process, require
    return (\n${rawValue}\n)
  `)
  return fn()
}

const escapeRegexRE = /[-/\\^$*+?.()|[\]{}]/g
export function escapeRegex(str: string): string {
  return str.replace(escapeRegexRE, '\\$&')
}