SyntaxError: Identifier '_<char>' has already been declared

Describe the bug

Hey guys, I already checked this issue https://github.com/vitejs/vite/issues/3363, but doesn’t look helpful at my case. So, I compile the project and then run with command node dist/server-node.cjs.js and sometimes give me the error which is wrote on title or this: TypeError: Cannot read properties of undefined (reading 'isEncoding'), someone has an idea what this could be? I just want move from “tsc” to “vite”, and with “tsc” the things was working perfectly. Thanks.

Reproduction

I don’t know what to put on reproduction but the problem ins’t on my code. So maybe my vite.config.ts could help in something.

package.json

{
  "name": "server-node",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview"
  },
  "dependencies": {
    "pg": "^8.7.3",
    "pg-native": "^3.0.0",
    "short-uuid": "^4.2.0"
  },
  "devDependencies": {
    "@types/node": "^18.0.0",
    "@types/pg": "^8.6.5",
    "typescript": "^4.7.4",
    "vite": "^2.9.12"
  }
}

vite.config.ts

import { defineConfig } from 'vite';

export const name = 'server-node';

// https://vitejs.dev/config/
export default defineConfig({
  optimizeDeps: {
    exclude: [
      'perf_hooks',
      'pg-native'
    ]
  },
  build: {
    target: 'ESNext',
    lib: {
      name,
      entry: 'src/index.ts',
      formats: [
        'cjs'
      ],
      fileName: (format) => `${name}.${format}.js`
    },
    rollupOptions: {
      external: [
        'perf_hooks',
        'pg-native'
      ],
      output: {
        globals: {
          perf_hooks: 'perf_hooks'
        }
      }
    }
  }
});

System Info

System:
    OS: macOS 12.4
    CPU: (10) arm64 Apple M1 Pro
    Memory: 1.31 GB / 32.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 18.2.0 - /opt/homebrew/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 8.11.0 - /opt/homebrew/bin/npm
  Browsers:
    Chrome: 102.0.5005.115
    Safari: 15.5
  npmPackages:
    vite: ^2.9.12 => 2.9.12

Used Package Manager

yarn

Logs

Click to expand!

yarn run v1.22.19
vite build --debug
  vite:config bundled config file loaded in 8.92ms +0ms
  vite:config using resolved config: {
  vite:config   optimizeDeps: {
  vite:config     exclude: [ 'perf_hooks', 'pg-native' ],
  vite:config     esbuildOptions: { keepNames: undefined, preserveSymlinks: undefined }
  vite:config   },
  vite:config   build: {
  vite:config     target: 'ESNext',
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: false,
  vite:config     cssTarget: 'ESNext',
  vite:config     sourcemap: false,
  vite:config     rollupOptions: { external: [Array], output: [Object] },
  vite:config     minify: 'esbuild',
  vite:config     terserOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     manifest: false,
  vite:config     lib: {
  vite:config       name: 'server-node',
  vite:config       entry: 'src/index.ts',
  vite:config       formats: [Array],
  vite:config       fileName: [Function: fileName]
  vite:config     },
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] }
  vite:config   },
  vite:config   configFile: './server_node/vite.config.ts',
  vite:config   configFileDependencies: [
  vite:config     './server_node/vite.config.ts'
  vite:config   ],
  vite:config   inlineConfig: {
  vite:config     root: undefined,
  vite:config     base: undefined,
  vite:config     mode: undefined,
  vite:config     configFile: undefined,
  vite:config     logLevel: undefined,
  vite:config     clearScreen: undefined,
  vite:config     build: {}
  vite:config   },
  vite:config   root: './server_node',
  vite:config   base: '/',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   publicDir: './server_node/public',
  vite:config   cacheDir: './server_node/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isWorker: false,
  vite:config   isProduction: true,
  vite:config   plugins: [
  vite:config     'vite:build-metadata',
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:watch-package-data',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:build-import-analysis',
  vite:config     'vite:esbuild-transpile',
  vite:config     'vite:terser',
  vite:config     'vite:reporter',
  vite:config     'vite:load-fallback'
  vite:config   ],
  vite:config   server: {
  vite:config     preTransformRequests: true,
  vite:config     fs: { strict: true, allow: [Array], deny: [Array] }
  vite:config   },
  vite:config   preview: {
  vite:config     port: undefined,
  vite:config     strictPort: undefined,
  vite:config     host: undefined,
  vite:config     https: undefined,
  vite:config     open: undefined,
  vite:config     proxy: undefined,
  vite:config     cors: undefined,
  vite:config     headers: undefined
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'production', DEV: false, PROD: true },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     warnOnce: [Function: warnOnce],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen],
  vite:config     hasErrorLogged: [Function: hasErrorLogged]
  vite:config   },
  vite:config   packageCache: Map(0) { set: [Function (anonymous)] },
  vite:config   createResolver: [Function: createResolver],
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: [
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object]
  vite:config     ],
  vite:config     rollupOptions: {}
  vite:config   }
  vite:config } +6ms
vite v2.9.12 building for production...
✓ 127 modules transformed.
dist/server-node.cjs.js   82.17 KiB / gzip: 26.99 KiB
✨  Done in 0.91s.

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it’s a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[amitShimon1983]

Hey again @amitShimon1983, so in this case, please give us an “reproduction”, so we can analyse it too, you still didn’t us gave a lot information about your problem. Maybe this problem can not be very specific at my case, could be something affecting it and giving same error. I already saw people with basically same error and my fix was literally different them.

Hey I open an issue https://github.com/vitejs/vite/issues/8948 hope this will help

[0rangeFox]

I came up with solution. first of all, I’m forced to disabled minify otherwise, you can configure it to use terser and disable the mangle option. Then, following the issue https://github.com/brianc/node-postgres/issues/1906, we should ignore the natives of postgresql library on CJS. So the final result for vite configuration is:

vite.config.ts

import { defineConfig } from 'vite';
import { builtinModules } from 'module';

const name = 'server-node';

// https://vitejs.dev/config/
export default defineConfig({
  build: {
    target: 'ESNext',
    minify: false,
    lib: {
      entry: 'src/index.ts',
      name,
      formats: [
        'cjs'
      ],
      fileName: (format) => `${name}.${format}.js`
    },
    rollupOptions: {
      external: builtinModules
    },
    commonjsOptions: {
      ignore: [
        'pg-native',
        './native'
      ]
    }
  }
});

And thanks for @bluwy, for mentioning the builtinModules, didn’t know about this and for him help too. Happy coding folks ✌️