TypeError: LRU is not a constructor #1885

lamiaagebriel · 2023-03-10T10:58:21Z

This error appears each time I install mysql2 using (yarn add mysql2 --save) with Next.js 13.2.
I reinstalled Next.js and mysql2 without any other dependencies to ensure it wasn't another dependency that affects it.

(
Server Error
TypeError: LRU is not a constructor

This error happened while generating the page. Any console logs will be displayed in the terminal window.
Call Stack
eval
node_modules\mysql2\lib\parsers\parser_cache.js (5:20)
(sc_server)/./node_modules/mysql2/lib/parsers/parser_cache.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (1470:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\lib\parsers\text_parser.js (7:20)
(sc_server)/./node_modules/mysql2/lib/parsers/text_parser.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (1492:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\lib\commands\query.js (10:22)
(sc_server)/./node_modules/mysql2/lib/commands/query.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (986:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\lib\commands\index.js (5:14)
(sc_server)/./node_modules/mysql2/lib/commands/index.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (953:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\lib\connection.js (29:17)
(sc_server)/./node_modules/mysql2/lib/connection.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (1041:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\index.js (5:19)
(sc_server)/./node_modules/mysql2/index.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (799:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
require
node_modules\mysql2\promise.js (3:13)
(sc_server)/./node_modules/mysql2/promise.js
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (1558:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
eval
webpack-internal:///(sc_server)/./utils/db.ts (5:72)
(sc_server)/./utils/db.ts
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (1920:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
eval
webpack-internal:///(sc_server)/./app/api/employees/route.ts (8:67)
(sc_server)/./app/api/employees/route.ts
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (216:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
eval
webpack-internal:///(sc_server)/./node_modules/next/dist/build/webpack/loaders/next-app-loader.js (13:106)
(sc_server)/./node_modules/next/dist/build/webpack/loaders/next-app-loader.js?name=app%2Fapi%2Femployees%2Froute&appPaths=&pagePath=private-next-app-dir%2Fapi%2Femployees%2Froute.ts&appDir=D%3A%5CWebsites%5Cnext-mysql%5Capp&pageExtensions=tsx&pageExtensions=ts&pageExtensions=jsx&pageExtensions=js&rootDir=D%3A%5CWebsites%5Cnext-mysql&isDev=true&tsconfigPath=tsconfig.json&assetPrefix=!
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (205:1)
webpack_require
file:///D:/Websites/next-mysql/.next/server/webpack-runtime.js (33:42)
webpack_exec
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (2073:39)

file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (2074:28)
Object.
file:///D:/Websites/next-mysql/.next/server/app/api/employees/route.js (2077:3)
Module._compile
node:internal/modules/cjs/loader (1254:14)
Module._extensions..js
node:internal/modules/cjs/loader (1308:10)
Module.load
node:internal/modules/cjs/loader (1117:32)
Module._load
node:internal/modules/cjs/loader (958:12)
Module.require
node:internal/modules/cjs/loader (1141:19)
require
node:internal/modules/cjs/helpers (110:18)
Object.requirePage
file:///D:/Websites/next-mysql/node_modules/next/dist/server/require.js (88:12)

file:///D:/Websites/next-mysql/node_modules/next/dist/server/load-components.js (49:73)
process.processTicksAndRejections
node:internal/process/task_queues (95:5)
async Object.loadComponentsImpl [as loadComponents]
file:///D:/Websites/next-mysql/node_modules/next/dist/server/load-components.js (49:26)
async DevServer.findPageComponentsImpl
file:///D:/Websites/next-mysql/node_modules/next/dist/server/next-server.js (599:36)
)

playitcool · 2023-03-10T19:08:09Z

I am also seeing this behavior with mysql2: ^3.2.0 and next: ^13.2.4

sidorares · 2023-03-10T21:56:24Z

also related #1876

@playitcool @lamiaagabriel I tried following steps but everything worked as expected for me:

npm init -y && npm install next mysql2
add pages/api/test.ts:

import { createConnection } from "mysql2/promise";

const DATABASE_URL='mysql://...';

export default async function handler(req, res) {
  const connection = await createConnection(DATABASE_URL);
  const [rows] = await connection.execute('SELECT * FROM test WHERE test.id = ?', ['119f4a6c-02f3-4f47-8103-9b5bf3b245db']);
  res.status(200).json({ rows })
}

playitcool · 2023-03-11T00:39:12Z

@sidorares - thank you for looking into it. One more detail - I am also using MysqlDialect query builder from this repo: https://github.com/koskimas/kysely, but I also tried the code you provided and got this:

error - node_modules/mysql2/lib/parsers/parser_cache.js (5:20) @ eval
error - TypeError: LRU is not a constructor
    at eval (webpack-internal:///(sc_server)/./node_modules/mysql2/lib/parsers/parser_cache.js:3:21)
    at (sc_server)/./node_modules/mysql2/lib/parsers/parser_cache.js (/Users/me/Documents/GitHub/reports/.next/server/app/page.js:1743:1)
    at __webpack_require__ (/Users/me/Documents/GitHub/reports/.next/server/webpack-runtime.js:33:42)
    at eval (webpack-internal:///(sc_server)/./node_modules/mysql2/lib/parsers/text_parser.js:6:21)
    at (sc_server)/./node_modules/mysql2/lib/parsers/text_parser.js (/Users/me/Documents/GitHub/reports/.next/server/app/page.js:1765:1)
    at __webpack_require__ (/Users/me/Documents/GitHub/reports/.next/server/webpack-runtime.js:33:42)
    at eval (webpack-internal:///(sc_server)/./node_modules/mysql2/lib/commands/query.js:7:23)
    at (sc_server)/./node_modules/mysql2/lib/commands/query.js (/Users/me/Documents/GitHub/reports/.next/server/app/page.js:1259:1)
    at __webpack_require__ (/Users/me/Documents/GitHub/reports/.next/server/webpack-runtime.js:33:42)
    at eval (webpack-internal:///(sc_server)/./node_modules/mysql2/lib/commands/index.js:4:15) {
  type: 'TypeError',
  page: '/'
}

sidorares · 2023-03-11T01:01:06Z

@playitcool can you make a repro repo, and also have lockfile checked in?

Nithur-M · 2023-03-11T05:53:31Z

Hello @sidorares, what project structure are you using? are you using the app directory? I think it may have something to do with server components. Not sure.
Mysql2 worked fine for me with the traditional pages directory but the issue is only with the app directory. I am putting the MySQL connection logic in a util file and then calling it.

App directory is an experimental feature and you need to explicitly enable it in next.config file.

sidorares · 2023-03-11T07:58:09Z

Can confirm I can reproduce the issue with app directory

the result of this line

node-mysql2/lib/parsers/parser_cache.js

Line 3 in fd9bd71

const LRU = require('lru-cache');

is { default: LRUCacheConstructor } when used from app directory and LRUCacheConstructor when used from pages

not sure yet which side the fix should be - next, node-lru-cache or mysql2

There was a PR in lru-cache recently ( isaacs/node-lru-cache#266 ) adding ESM support but it's already in the version 7.18.3 that [email protected] currently is using

SpBills · 2023-03-11T21:23:55Z

Is there a version we can revert back to for now?

SpBills · 2023-03-11T21:27:53Z

Downgrading to Next 13.0 made it work for me with mysql2@^3.2.0

cw1997 · 2023-03-12T04:55:41Z

I also meet this problem, and I don't know if the bug occurs from next.js or node-mysql2

Nithur-M · 2023-03-12T06:09:14Z

@SpBills are you using the app directory?

[edit]: just checked Next 13.0 with the App directory and the above issue still persists.

SpBills · 2023-03-13T12:07:18Z

Even in Next 13.0 app directory it didn't work. Maybe this is an app dir problem? Good point.

barthicus · 2023-03-17T07:24:41Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:

/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config

I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

SpBills · 2023-03-17T11:57:44Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge zap

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

Wow. Great catch.

Angelelz · 2023-03-29T04:36:41Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

Mr wizard! Thank you!

KieranLinton · 2023-04-17T14:54:25Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

You are an absolute life saver!

SamuelBucher · 2023-04-25T18:37:41Z

I have the same issue, but I work with Node.js and npm. How can this be solved for my case?

arondeparon · 2023-04-27T22:31:04Z

Same issue here, Next 13.3.0 and Mysql 3.2.3. Not using app directory, but anything in /api seems to cause this error.

sidorares · 2023-04-28T02:38:12Z

@SamuelBucher can you make a repro repository? Are you using any bundler tools or its just a standard node module system?

SamuelBucher · 2023-05-01T14:24:00Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

I rebuilt my project for Next.js, but this solution still didn't work.

barthicus · 2023-05-02T09:12:18Z

@SamuelBucher Could you share a repro link? It's difficult to help without it. Next.js in app dir mode is being updated daily by dev team through releases (canary) and maybe some new issue appeared.

SamuelBucher · 2023-05-02T11:00:14Z

@SamuelBucher Could you share a repro link? It's difficult to help without it. Next.js in app dir mode is being updated daily by dev team through releases (canary) and maybe some new issue appeared.

I've already solved this issue by messing with versions in package.json

"dependencies": {
"mysql2": "^2.2.5",
"pg-hstore": "^2.3.4",
"sequelize": "^5.22.5"
},

jaakumasi · 2023-05-02T15:16:29Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

Perfect! Issue fixed! God bless 🙏🏼

Beipy · 2023-05-11T07:28:10Z

Nuxt3 #2001 (comment)

Tenodec · 2023-11-30T02:14:09Z

Build for electron，it's the same problem .
already use
const LRU = require('lru-cache').default;

wellwelwel · 2023-12-01T18:15:56Z

Hi @Tenodec, can you share a basic repro? Also, knowing the electron and mysql2 versions might help 🙋🏻‍♂️

Githubにissueが上がっていました、その通りに対処して解決しました sidorares/node-mysql2#1885

lbxx11 · 2024-11-05T11:52:21Z

Hi everyone. I also got stuck with this issue and was pulling hair of my head because I thought it should work in any node.js environment. Even in the new Next.js app router mode in page or route handler.

My stack: next 13 appDir, drizzle orm with mysql, monorepo, turbo, typescript.

So i started digging and experimenting and I think I found the solution.

I put the mysql2 dependency in next.config.js under the experimental.serverComponentsExternalPackages and after server restart it worked.

So the next.config.js should look like this:
/** @type {import("next").NextConfig} */
const config = {
  reactStrictMode: true,
  experimental: {
    appDir: true,
    typedRoutes: true,
    serverComponentsExternalPackages: ["mysql2"],
    // runtime: "edge",
  },
}
export default config
I'm not that familiar with how this works under the hood but if it works that's fine for me and I can continue playing with next 13 appDir on the edge ⚡

You can read more about this feature here: https://beta.nextjs.org/docs/api-reference/next.config.js#servercomponentsexternalpackages

EDIT: I noticed that new next.js beta docs changes frequently so if the link above doesn't work try this: https://beta.nextjs.org/docs/api-reference/next-config#servercomponentsexternalpackages

you really a life saver 🙏

barthicus mentioned this issue Mar 17, 2023

[BUG]: Error resolving commonjs request for [project]/node_modules/better-sqlite3/lib/database.js drizzle-team/drizzle-orm#249

Closed

wellwelwel mentioned this issue May 11, 2023

fix: LRU constructor #2004

Merged

wellwelwel mentioned this issue Jun 20, 2023

After upgrading lru-cache to ^8.0.0 node >= 16.14 is required #1953

Closed

sidorares mentioned this issue Jun 20, 2023

Working Fine on Localhost But crash on Cpanel #2077

Open

sidorares mentioned this issue Mar 27, 2024

⨯ node_modules\mysql2\lib\connection_config.js (261:0) @ <unknown> ⨯ URL is not a constructor #2537

Closed

wellwelwel mentioned this issue Aug 27, 2024

fix: resolve LRU conflicts, cache loss and premature engine breaking change #2988

Merged

wellwelwel closed this as completed in #2988 Sep 11, 2024

Daiius added a commit to Daiius/videmus that referenced this issue Oct 30, 2024

'poolConnection is not a constructor'の本来の原因に対処

be7dde1

Githubにissueが上がっていました、その通りに対処して解決しました sidorares/node-mysql2#1885

Daiius mentioned this issue Oct 30, 2024

241029 UI ux Daiius/videmus#12

Merged

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TypeError: LRU is not a constructor #1885

TypeError: LRU is not a constructor #1885

lamiaagebriel commented Mar 10, 2023

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lbxx11 commented Nov 5, 2024

TypeError: LRU is not a constructor #1885

TypeError: LRU is not a constructor #1885

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