perf: improve speed

1. Replace hash algorithm `sha256` with `md5`

2. Skip write file if hash is same

__test__/utils.spec.ts

@@ -1,7 +1,6 @@
 import path from 'path'
 import { describe, expect, it, test } from 'vitest'
-import { eq, isPublicTypescript, linebreak, setEol } from '../src/utils'
-import { getContentHash } from '../src/utils/build'
+import { eq, extractHashFromFileName, getContentHash, isPublicTypescript, linebreak, setEol } from '../src/utils'
 import { getGlobalConfig, setGlobalConfig } from '../src/utils/globalConfig'
 
 describe('vite-plugin-public-typescript', () => {
@@ -72,4 +71,11 @@ describe('vite-plugin-public-typescript', () => {
     setGlobalConfig({ config: { publicDir: 'public' }, inputDir: 'publicTypescript' })
     expect(() => getGlobalConfig()).not.toThrowError()
   })
+
+  test('should extract hash', () => {
+    const hash1 = extractHashFromFileName('dir/hello.1234.js', 4)
+    const hash2 = extractHashFromFileName('hello.1234', 4)
+    expect(hash1).toBe('1234')
+    expect(hash2).toBe('1234')
+  })
 })

src/utils/build.ts

@@ -1,4 +1,3 @@
-import { createHash } from 'crypto'
 import path from 'path'
 import type { ResolvedConfig } from 'vite'
 import { normalizePath } from 'vite'
@@ -10,16 +9,7 @@ import type { VPPTPluginOptions } from '..'
 import { name } from '../../package.json'
 import { getGlobalConfig } from './globalConfig'
 import { assert } from './assert'
-import { debug, writeFile } from '.'
-
-export function getContentHash(chunk: string | Uint8Array | undefined, hash?: VPPTPluginOptions['hash']) {
-  if (!chunk) {
-    return ''
-  }
-  const hashLen = typeof hash === 'number' ? hash : 8
-
-  return createHash('sha256').update(chunk).digest('hex').substring(0, hashLen)
-}
+import { debug, getContentHash, writeFile } from '.'
 
 const noSideEffectsPlugin: Plugin = {
   name: 'no-side-effects',

src/utils/index.ts

@@ -1,9 +1,11 @@
 import path from 'path'
+import { createHash } from 'crypto'
 import type { WebSocketServer } from 'vite'
 import { normalizePath } from 'vite'
 import fs from 'fs-extra'
 import createDebug from 'debug'
 import { name as PKGNAME } from '../../package.json'
+import type { VPPTPluginOptions } from '..'
 
 export const debug = createDebug(PKGNAME)
 
@@ -80,6 +82,11 @@ export function writeFile(filename: string, content: string): void {
   const newContent = setEol(content)
 
   if (fs.existsSync(filename)) {
+    if (extractHashFromFileName(filename)) {
+      // if filename has hash, skip write file
+      debug('skip writeFile, filename has hash')
+      return
+    }
     // Read content first
     // if content is same, skip write file
     const oldContent = fs.readFileSync(filename, 'utf-8')
@@ -93,3 +100,22 @@ export function writeFile(filename: string, content: string): void {
 
   debug('writeFile success:', filename)
 }
+
+const HASH_LEN = 8
+export function getContentHash(chunk: string | Uint8Array | undefined, hash?: VPPTPluginOptions['hash']) {
+  if (!chunk) {
+    return ''
+  }
+  const hashLen = typeof hash === 'number' ? hash : HASH_LEN
+
+  return createHash('md5').update(chunk).digest('hex').substring(0, hashLen)
+}
+
+export function extractHashFromFileName(filename: string, hashLen = HASH_LEN) {
+  const regex = new RegExp(`\\.([\\w\\d]{${hashLen}})\\.?`)
+  const match = filename.match(regex)
+  if (match) {
+    return match[1]
+  }
+  return ''
+}