From 8143dbbefcd1e27d04b2b1284088d45a21cf1996 Mon Sep 17 00:00:00 2001
From: ivan <sun_day500@163.com>
Date: Thu, 23 Mar 2023 00:24:58 +0800
Subject: [PATCH] perf: replace endsWith with ===

---
 packages/vite/src/node/optimizer/scan.ts      |  12 +-
 packages/vite/src/node/packages.ts            |   4 +-
 packages/vite/src/node/plugins/asset.ts       |   6 +-
 packages/vite/src/node/plugins/esbuild.ts     |   4 +-
 packages/vite/src/node/plugins/html.ts        |   3 +-
 .../vite/src/node/plugins/importAnalysis.ts   |  10 +-
 .../src/node/plugins/importAnalysisBuild.ts   |   5 +-
 packages/vite/src/node/plugins/reporter.ts    |   6 +-
 packages/vite/src/node/plugins/resolve.ts     |   8 +-
 packages/vite/src/node/server/hmr.ts          |  10 +-
 packages/vite/src/node/server/index.ts        |   3 +-
 .../src/node/server/middlewares/indexHtml.ts  |   3 +-
 .../src/node/server/middlewares/static.ts     |   5 +-
 .../src/node/server/middlewares/transform.ts  |   3 +-
 .../vite/src/node/server/transformRequest.ts  |   3 +-
 packages/vite/src/node/ssr/ssrExternal.ts     |   6 +-
 packages/vite/src/node/utils.ts               | 153 +++++++++++++++++-
 17 files changed, 206 insertions(+), 38 deletions(-)

diff --git a/packages/vite/src/node/optimizer/scan.ts b/packages/vite/src/node/optimizer/scan.ts
index 7929b337b8a6e4..69b245dd4253b9 100644
--- a/packages/vite/src/node/optimizer/scan.ts
+++ b/packages/vite/src/node/optimizer/scan.ts
@@ -17,8 +17,12 @@ import {
   createDebugger,
   dataUrlRE,
   externalRE,
+  isAstroExt,
+  isHtmlExt,
   isObject,
   isOptimizable,
+  isSvelteExt,
+  isVueExt,
   moduleListContains,
   multilineCommentsRE,
   normalizePath,
@@ -366,7 +370,7 @@ function esbuildScanPlugin(
           let raw = fs.readFileSync(path, 'utf-8')
           // Avoid matching the content of the comment
           raw = raw.replace(commentRE, '<!---->')
-          const isHtml = path.endsWith('.html')
+          const isHtml = isHtmlExt(path)
           const regex = isHtml ? scriptModuleRE : scriptRE
           regex.lastIndex = 0
           let js = ''
@@ -394,7 +398,7 @@ function esbuildScanPlugin(
             let loader: Loader = 'js'
             if (lang === 'ts' || lang === 'tsx' || lang === 'jsx') {
               loader = lang
-            } else if (path.endsWith('.astro')) {
+            } else if (isAstroExt(path)) {
               loader = 'ts'
             }
             const srcMatch = openTag.match(srcRE)
@@ -445,7 +449,7 @@ function esbuildScanPlugin(
               // Especially for Svelte files, exports in <script context="module"> means module exports,
               // exports in <script> means component props. To avoid having two same export name from the
               // star exports, we need to ignore exports in <script>
-              if (path.endsWith('.svelte') && context !== 'module') {
+              if (isSvelteExt(path) && context !== 'module') {
                 js += `import ${virtualModulePath}\n`
               } else {
                 js += `export * from ${virtualModulePath}\n`
@@ -457,7 +461,7 @@ function esbuildScanPlugin(
           // anywhere in a string. Svelte and Astro files can't have
           // `export default` as code so we know if it's encountered it's a
           // false positive (e.g. contained in a string)
-          if (!path.endsWith('.vue') || !js.includes('export default')) {
+          if (!isVueExt(path) || !js.includes('export default')) {
             js += '\nexport default {}'
           }
 
diff --git a/packages/vite/src/node/packages.ts b/packages/vite/src/node/packages.ts
index 728c941051f72f..1ed9bbaffcac17 100644
--- a/packages/vite/src/node/packages.ts
+++ b/packages/vite/src/node/packages.ts
@@ -1,7 +1,7 @@
 import fs from 'node:fs'
 import path from 'node:path'
 import { createRequire } from 'node:module'
-import { createFilter, safeRealpathSync } from './utils'
+import { createFilter, isJsonExt, safeRealpathSync } from './utils'
 import type { ResolvedConfig } from './config'
 import type { Plugin } from './plugin'
 
@@ -204,7 +204,7 @@ export function watchPackageDataPlugin(config: ResolvedConfig): Plugin {
   const { packageCache } = config
   const setPackageData = packageCache.set.bind(packageCache)
   packageCache.set = (id, pkg) => {
-    if (id.endsWith('.json')) {
+    if (isJsonExt(id)) {
       watchFile(id)
     }
     return setPackageData(id, pkg)
diff --git a/packages/vite/src/node/plugins/asset.ts b/packages/vite/src/node/plugins/asset.ts
index 6dcf8be3a9c1a0..2034afe60cc39f 100644
--- a/packages/vite/src/node/plugins/asset.ts
+++ b/packages/vite/src/node/plugins/asset.ts
@@ -19,6 +19,8 @@ import type { ResolvedConfig } from '../config'
 import {
   cleanUrl,
   getHash,
+  isHtmlExt,
+  isSvgExt,
   joinUrlSegments,
   normalizePath,
   removeLeadingSlash,
@@ -333,8 +335,8 @@ async function fileToBuiltUrl(
   let url: string
   if (
     config.build.lib ||
-    (!file.endsWith('.svg') &&
-      !file.endsWith('.html') &&
+    (!isSvgExt(file) &&
+      !isHtmlExt(file) &&
       content.length < Number(config.build.assetsInlineLimit) &&
       !isGitLfsPlaceholder(content))
   ) {
diff --git a/packages/vite/src/node/plugins/esbuild.ts b/packages/vite/src/node/plugins/esbuild.ts
index f12b6cba1b97c0..8c84e0bfe3281b 100644
--- a/packages/vite/src/node/plugins/esbuild.ts
+++ b/packages/vite/src/node/plugins/esbuild.ts
@@ -18,6 +18,7 @@ import {
   createFilter,
   ensureWatchedFile,
   generateCodeFrame,
+  isJsonExt,
 } from '../utils'
 import type { ResolvedConfig, ViteDevServer } from '..'
 import type { Plugin } from '../plugin'
@@ -481,8 +482,7 @@ function reloadOnTsconfigChange(changedFile: string) {
   // any json file in the tsconfig cache could have been used to compile ts
   if (
     path.basename(changedFile) === 'tsconfig.json' ||
-    (changedFile.endsWith('.json') &&
-      tsconfckParseOptions?.cache?.has(changedFile))
+    (isJsonExt(changedFile) && tsconfckParseOptions?.cache?.has(changedFile))
   ) {
     server.config.logger.info(
       `changed tsconfig file detected: ${changedFile} - Clearing cache and forcing full-reload to ensure TypeScript is compiled with updated config values.`,
diff --git a/packages/vite/src/node/plugins/html.ts b/packages/vite/src/node/plugins/html.ts
index 769de344b15290..321bc5605c968c 100644
--- a/packages/vite/src/node/plugins/html.ts
+++ b/packages/vite/src/node/plugins/html.ts
@@ -18,6 +18,7 @@ import {
   getHash,
   isDataUrl,
   isExternalUrl,
+  isHtmlExt,
   isUrl,
   normalizePath,
   processSrcSet,
@@ -303,7 +304,7 @@ export function buildHtmlPlugin(config: ResolvedConfig): Plugin {
     name: 'vite:build-html',
 
     async transform(html, id) {
-      if (id.endsWith('.html')) {
+      if (isHtmlExt(id)) {
         const relativeUrlPath = path.posix.relative(
           config.root,
           normalizePath(id),
diff --git a/packages/vite/src/node/plugins/importAnalysis.ts b/packages/vite/src/node/plugins/importAnalysis.ts
index ff1ff1b0d801bb..0ae6b312bdb619 100644
--- a/packages/vite/src/node/plugins/importAnalysis.ts
+++ b/packages/vite/src/node/plugins/importAnalysis.ts
@@ -33,6 +33,10 @@ import {
   isDataUrl,
   isExternalUrl,
   isJSRequest,
+  isJsonExt,
+  isJsxExt,
+  isTsxExt,
+  isVueExt,
   joinUrlSegments,
   moduleListContains,
   normalizePath,
@@ -223,8 +227,8 @@ export function importAnalysisPlugin(config: ResolvedConfig): Plugin {
       try {
         ;[imports, exports] = parseImports(source)
       } catch (e: any) {
-        const isVue = importer.endsWith('.vue')
-        const isJsx = importer.endsWith('.jsx') || importer.endsWith('.tsx')
+        const isVue = isVueExt(importer)
+        const isJsx = isJsxExt(importer) || isTsxExt(importer)
         const maybeJSX = !isVue && isJSRequest(importer)
 
         const msg = isVue
@@ -498,7 +502,7 @@ export function importAnalysisPlugin(config: ResolvedConfig): Plugin {
           if (
             specifier[0] === '/' &&
             !config.assetsInclude(cleanUrl(specifier)) &&
-            !specifier.endsWith('.json') &&
+            !isJsonExt(specifier) &&
             checkPublicFile(specifier, config)
           ) {
             throw new Error(
diff --git a/packages/vite/src/node/plugins/importAnalysisBuild.ts b/packages/vite/src/node/plugins/importAnalysisBuild.ts
index 6dba547213926e..96c355b4d70a4e 100644
--- a/packages/vite/src/node/plugins/importAnalysisBuild.ts
+++ b/packages/vite/src/node/plugins/importAnalysisBuild.ts
@@ -9,6 +9,7 @@ import {
   bareImportRE,
   cleanUrl,
   combineSourcemaps,
+  isCssExt,
   isDataUrl,
   isExternalUrl,
   moduleListContains,
@@ -79,7 +80,7 @@ function preload(
       dep = assetsURL(dep, importerUrl)
       if (dep in seen) return
       seen[dep] = true
-      const isCss = dep.endsWith('.css')
+      const isCss = isCssExt(dep)
       const cssSelector = isCss ? '[rel="stylesheet"]' : ''
       const isBaseRelative = !!importerUrl
 
@@ -527,7 +528,7 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                     const cssDeps: string[] = []
                     const otherDeps: string[] = []
                     for (const dep of depsArray) {
-                      ;(dep.endsWith('.css') ? cssDeps : otherDeps).push(dep)
+                      ;(isCssExt(dep) ? cssDeps : otherDeps).push(dep)
                     }
                     resolvedDeps = [
                       ...resolveDependencies(normalizedFile, otherDeps, {
diff --git a/packages/vite/src/node/plugins/reporter.ts b/packages/vite/src/node/plugins/reporter.ts
index 5b8ae593bdefea..146dee38d0dd9d 100644
--- a/packages/vite/src/node/plugins/reporter.ts
+++ b/packages/vite/src/node/plugins/reporter.ts
@@ -4,7 +4,7 @@ import { promisify } from 'node:util'
 import colors from 'picocolors'
 import type { Plugin } from 'rollup'
 import type { ResolvedConfig } from '../config'
-import { isDefined, normalizePath } from '../utils'
+import { isCssExt, isDefined, isSourceMapExt, normalizePath } from '../utils'
 import { LogLevels } from '../logger'
 
 const groups = [
@@ -142,8 +142,8 @@ export function buildReporterPlugin(config: ResolvedConfig): Plugin {
                     mapSize: chunk.map ? chunk.map.toString().length : null,
                   }
                 } else {
-                  if (chunk.fileName.endsWith('.map')) return null
-                  const isCSS = chunk.fileName.endsWith('.css')
+                  if (isSourceMapExt(chunk.fileName)) return null
+                  const isCSS = isCssExt(chunk.fileName)
                   return {
                     name: chunk.fileName,
                     group: isCSS ? 'CSS' : 'Assets',
diff --git a/packages/vite/src/node/plugins/resolve.ts b/packages/vite/src/node/plugins/resolve.ts
index 5522ec0656d19d..70b4da68cf085d 100644
--- a/packages/vite/src/node/plugins/resolve.ts
+++ b/packages/vite/src/node/plugins/resolve.ts
@@ -27,6 +27,8 @@ import {
   isBuiltin,
   isDataUrl,
   isExternalUrl,
+  isHtmlExt,
+  isMjsExt,
   isNonDriveRelativeAbsolutePath,
   isObject,
   isOptimizable,
@@ -281,7 +283,7 @@ export function resolvePlugin(resolveOptions: InternalResolveOptions): Plugin {
       // relative
       if (
         id[0] === '.' ||
-        ((preferRelative || importer?.endsWith('.html')) &&
+        ((preferRelative || isHtmlExt(importer)) &&
           startsWithWordCharRE.test(id))
       ) {
         const basedir = importer ? path.dirname(importer) : process.cwd()
@@ -962,7 +964,7 @@ export function resolvePackageEntry(
     if (
       targetWeb &&
       options.browserField &&
-      (!entryPoint || entryPoint.endsWith('.mjs'))
+      (!entryPoint || isMjsExt(entryPoint))
     ) {
       // check browser field
       // https://github.com/defunctzombie/package-browser-field-spec
@@ -1006,7 +1008,7 @@ export function resolvePackageEntry(
 
     // fallback to mainFields if still not resolved
     // TODO: review if `.mjs` check is still needed
-    if (!resolvedFromExports && (!entryPoint || entryPoint.endsWith('.mjs'))) {
+    if (!resolvedFromExports && (!entryPoint || isMjsExt(entryPoint))) {
       for (const field of options.mainFields) {
         if (field === 'browser') continue // already checked above
         if (typeof data[field] === 'string') {
diff --git a/packages/vite/src/node/server/hmr.ts b/packages/vite/src/node/server/hmr.ts
index 454bccd0f83474..145ce6dccdfc9c 100644
--- a/packages/vite/src/node/server/hmr.ts
+++ b/packages/vite/src/node/server/hmr.ts
@@ -5,7 +5,13 @@ import colors from 'picocolors'
 import type { Update } from 'types/hmrPayload'
 import type { RollupError } from 'rollup'
 import { CLIENT_DIR } from '../constants'
-import { createDebugger, normalizePath, unique, wrapId } from '../utils'
+import {
+  createDebugger,
+  isHtmlExt,
+  normalizePath,
+  unique,
+  wrapId,
+} from '../utils'
 import type { ViteDevServer } from '..'
 import { isCSSRequest } from '../plugins/css'
 import { getAffectedGlobModules } from '../plugins/importMetaGlob'
@@ -110,7 +116,7 @@ export async function handleHMRUpdate(
 
   if (!hmrContext.modules.length) {
     // html file cannot be hot updated
-    if (file.endsWith('.html')) {
+    if (isHtmlExt(file)) {
       config.logger.info(colors.green(`page reload `) + colors.dim(shortFile), {
         clear: true,
         timestamp: true,
diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index 4644c06f2d379d..19ac841b8741d1 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -24,6 +24,7 @@ import type { InlineConfig, ResolvedConfig } from '../config'
 import { isDepsOptimizerEnabled, resolveConfig } from '../config'
 import {
   diffDnsOrderChange,
+  isJsonExt,
   isParentDirectory,
   mergeConfig,
   normalizePath,
@@ -516,7 +517,7 @@ export async function createServer(
   const { packageCache } = config
   const setPackageData = packageCache.set.bind(packageCache)
   packageCache.set = (id, pkg) => {
-    if (id.endsWith('.json')) {
+    if (isJsonExt(id)) {
       watcher.add(id)
     }
     return setPackageData(id, pkg)
diff --git a/packages/vite/src/node/server/middlewares/indexHtml.ts b/packages/vite/src/node/server/middlewares/indexHtml.ts
index 764f48d4ad9169..5e28771d4a331e 100644
--- a/packages/vite/src/node/server/middlewares/indexHtml.ts
+++ b/packages/vite/src/node/server/middlewares/indexHtml.ts
@@ -27,6 +27,7 @@ import {
   ensureWatchedFile,
   fsPathFromId,
   injectQuery,
+  isHtmlExt,
   joinUrlSegments,
   normalizePath,
   processSrcSetSync,
@@ -288,7 +289,7 @@ export function indexHtmlMiddleware(
 
     const url = req.url && cleanUrl(req.url)
     // htmlFallbackMiddleware appends '.html' to URLs
-    if (url?.endsWith('.html') && req.headers['sec-fetch-dest'] !== 'script') {
+    if (url && isHtmlExt(url) && req.headers['sec-fetch-dest'] !== 'script') {
       const filename = getHtmlFilename(url, server)
       if (fs.existsSync(filename)) {
         try {
diff --git a/packages/vite/src/node/server/middlewares/static.ts b/packages/vite/src/node/server/middlewares/static.ts
index 27ac7cbceecab5..a11b07b0d38358 100644
--- a/packages/vite/src/node/server/middlewares/static.ts
+++ b/packages/vite/src/node/server/middlewares/static.ts
@@ -13,6 +13,7 @@ import {
   isImportRequest,
   isInternalRequest,
   isParentDirectory,
+  isTrailingSlash,
   isWindows,
   removeLeadingSlash,
   shouldServeFile,
@@ -92,7 +93,7 @@ export function serveStaticMiddleware(
     // also skip internal requests `/@fs/ /@vite-client` etc...
     const cleanedUrl = cleanUrl(req.url!)
     if (
-      cleanedUrl.endsWith('/') ||
+      isTrailingSlash(cleanedUrl) ||
       path.extname(cleanedUrl) === '.html' ||
       isInternalRequest(req.url!)
     ) {
@@ -123,7 +124,7 @@ export function serveStaticMiddleware(
 
     const resolvedPathname = redirectedPathname || pathname
     let fileUrl = path.resolve(dir, removeLeadingSlash(resolvedPathname))
-    if (resolvedPathname.endsWith('/') && !fileUrl.endsWith('/')) {
+    if (isTrailingSlash(resolvedPathname) && !isTrailingSlash(fileUrl)) {
       fileUrl = fileUrl + '/'
     }
     if (!ensureServingAccess(fileUrl, server, res, next)) {
diff --git a/packages/vite/src/node/server/middlewares/transform.ts b/packages/vite/src/node/server/middlewares/transform.ts
index 25b3843ad021c5..f75273b23f73b3 100644
--- a/packages/vite/src/node/server/middlewares/transform.ts
+++ b/packages/vite/src/node/server/middlewares/transform.ts
@@ -11,6 +11,7 @@ import {
   injectQuery,
   isImportRequest,
   isJSRequest,
+  isSourceMapExt,
   normalizePath,
   prettifyUrl,
   removeImportQuery,
@@ -68,7 +69,7 @@ export function transformMiddleware(
     const withoutQuery = cleanUrl(url)
 
     try {
-      const isSourceMap = withoutQuery.endsWith('.map')
+      const isSourceMap = isSourceMapExt(withoutQuery)
       // since we generate source map references, handle those requests here
       if (isSourceMap) {
         const depsOptimizer = getDepsOptimizer(server.config, false) // non-ssr
diff --git a/packages/vite/src/node/server/transformRequest.ts b/packages/vite/src/node/server/transformRequest.ts
index 36141f58017aa2..96f31b1222c170 100644
--- a/packages/vite/src/node/server/transformRequest.ts
+++ b/packages/vite/src/node/server/transformRequest.ts
@@ -11,6 +11,7 @@ import {
   cleanUrl,
   createDebugger,
   ensureWatchedFile,
+  isHtmlExt,
   isObject,
   prettifyUrl,
   removeTimestampQuery,
@@ -176,7 +177,7 @@ async function loadAndTransform(
   if (loadResult == null) {
     // if this is an html request and there is no load result, skip ahead to
     // SPA fallback.
-    if (options.html && !id.endsWith('.html')) {
+    if (options.html && !isHtmlExt(id)) {
       return null
     }
     // try fallback loading it from fs as string
diff --git a/packages/vite/src/node/ssr/ssrExternal.ts b/packages/vite/src/node/ssr/ssrExternal.ts
index 6644fdd8e2e0b4..9c08a0fbfbf1e7 100644
--- a/packages/vite/src/node/ssr/ssrExternal.ts
+++ b/packages/vite/src/node/ssr/ssrExternal.ts
@@ -9,6 +9,8 @@ import {
   createFilter,
   isBuiltin,
   isDefined,
+  isJsExt,
+  isMjsExt,
   lookupFile,
   normalizePath,
 } from '../utils'
@@ -295,7 +297,7 @@ function cjsSsrCollectExternals(
         continue
       }
 
-      if (pkg.type === 'module' || esmEntry.endsWith('.mjs')) {
+      if (pkg.type === 'module' || isMjsExt(esmEntry)) {
         ssrExternals.add(id)
         continue
       }
@@ -330,7 +332,7 @@ export function cjsShouldExternalizeForSSR(
     }
     // deep imports, check ext before externalizing - only externalize
     // extension-less imports and explicit .js imports
-    if (id.startsWith(e + '/') && (!path.extname(id) || id.endsWith('.js'))) {
+    if (id.startsWith(e + '/') && (!path.extname(id) || isJsExt(id))) {
       return true
     }
   })
diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index d13205bb007402..6a43ac7ea40b73 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -237,7 +237,7 @@ export function fsPathFromUrl(url: string): string {
  * @returns true if dir is a parent of file
  */
 export function isParentDirectory(dir: string, file: string): boolean {
-  if (!dir.endsWith('/')) {
+  if (!isTrailingSlash(dir)) {
     dir = `${dir}/`
   }
   return (
@@ -271,7 +271,7 @@ export const isJSRequest = (url: string): boolean => {
   if (knownJsSrcRE.test(url)) {
     return true
   }
-  if (!path.extname(url) && !url.endsWith('/')) {
+  if (!path.extname(url) && !isTrailingSlash(url)) {
     return true
   }
   return false
@@ -1139,8 +1139,8 @@ function normalizeSingleAlias({
 }: Alias): Alias {
   if (
     typeof find === 'string' &&
-    find.endsWith('/') &&
-    replacement.endsWith('/')
+    isTrailingSlash(find) &&
+    isTrailingSlash(replacement)
   ) {
     find = find.slice(0, find.length - 1)
     replacement = replacement.slice(0, replacement.length - 1)
@@ -1232,7 +1232,7 @@ export function joinUrlSegments(a: string, b: string): string {
   if (!a || !b) {
     return a || b || ''
   }
-  if (a.endsWith('/')) {
+  if (isTrailingSlash(a)) {
     a = a.substring(0, a.length - 1)
   }
   if (b[0] !== '/') {
@@ -1249,7 +1249,7 @@ export function stripBase(path: string, base: string): string {
   if (path === base) {
     return '/'
   }
-  const devBase = base.endsWith('/') ? base : base + '/'
+  const devBase = isTrailingSlash(base) ? base : base + '/'
   return path.replace(RegExp('^' + devBase), '/')
 }
 
@@ -1274,3 +1274,144 @@ const escapeRegexRE = /[-/\\^$*+?.()|[\]{}]/g
 export function escapeRegex(str: string): string {
   return str.replace(escapeRegexRE, '\\$&')
 }
+
+export function isTrailingSlash(file: string): boolean {
+  return file[file.length - 1] === '/'
+}
+
+export function isJsonExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'n' &&
+    file[len - 2] === 'o' &&
+    file[len - 3] === 's' &&
+    file[len - 4] === 'j' &&
+    file[len - 5] === '.'
+  )
+}
+
+export function isJsExt(file: string): boolean {
+  const len = file.length
+
+  return file[len - 1] === 's' && file[len - 2] === 'j' && file[len - 3] === '.'
+}
+
+export function isMjsExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 's' &&
+    file[len - 2] === 'j' &&
+    file[len - 3] === 'm' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isCssExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 's' &&
+    file[len - 2] === 's' &&
+    file[len - 3] === 'c' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isHtmlExt(file?: string): boolean {
+  if (!file) {
+    return false
+  }
+  const len = file.length
+
+  return (
+    file[len - 1] === 'l' &&
+    file[len - 2] === 'm' &&
+    file[len - 3] === 't' &&
+    file[len - 4] === 'h' &&
+    file[len - 5] === '.'
+  )
+}
+
+export function isSourceMapExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'p' &&
+    file[len - 2] === 'a' &&
+    file[len - 3] === 'm' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isVueExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'e' &&
+    file[len - 2] === 'u' &&
+    file[len - 3] === 'v' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isJsxExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'x' &&
+    file[len - 2] === 's' &&
+    file[len - 3] === 'j' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isTsxExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'x' &&
+    file[len - 2] === 's' &&
+    file[len - 3] === 't' &&
+    file[len - 4] === '.'
+  )
+}
+
+export function isAstroExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'o' &&
+    file[len - 2] === 'r' &&
+    file[len - 3] === 't' &&
+    file[len - 4] === 's' &&
+    file[len - 5] === 'a' &&
+    file[len - 6] === '.'
+  )
+}
+
+export function isSvelteExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'e' &&
+    file[len - 2] === 't' &&
+    file[len - 3] === 'l' &&
+    file[len - 4] === 'e' &&
+    file[len - 5] === 'v' &&
+    file[len - 6] === 's' &&
+    file[len - 7] === '.'
+  )
+}
+
+export function isSvgExt(file: string): boolean {
+  const len = file.length
+
+  return (
+    file[len - 1] === 'g' &&
+    file[len - 2] === 'v' &&
+    file[len - 3] === 's' &&
+    file[len - 4] === '.'
+  )
+}