Nest Library generation fails in v20.0.0

[anthony-b-dev]

Current Behavior

nx g @nx/nest:lib fgb-tenant

NX Generating @nx/nest:library

NX Could not find root flat config file

Expected Behavior

Library is generated

GitHub Repo

No response

Steps to Reproduce

1. Run the nest library generation command

Nx Report

Node : 20.11.1
OS : win32-x64
Native Target : x86_64-windows
npm : 9.6.6

nx (global) : 20.0.0
nx : 20.0.0
@nx/js : 20.0.0
@nx/jest : 20.0.0
@nx/eslint : 20.0.0
@nx/workspace : 20.0.0
@nx/angular : 20.0.0
@nx/cypress : 20.0.0
@nx/devkit : 20.0.0
@nx/esbuild : 20.0.0
@nx/eslint-plugin : 20.0.0
@nx/express : 20.0.0
@nx/nest : 20.0.0
@nx/node : 20.0.0
@nx/web : 20.0.0
@nx/webpack : 20.0.0
typescript : 5.5.4

Community plugins:
@ngrx/component-store : 18.1.0
@ngrx/effects : 18.1.0
@ngrx/entity : 18.1.0
@ngrx/eslint-plugin : 18.1.0
@ngrx/operators : 18.1.0
@ngrx/router-store : 18.1.0
@ngrx/schematics : 18.1.0
@ngrx/store : 18.1.0
@ngrx/store-devtools : 18.1.0

Failure Logs

NX Generating @nx/nest:library

NX Could not find root flat config file

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

I have tried it with the directory command, nx g lib, and the fully expanded command. Nothing works.

[abdul-alim]

I am getting the below error while setting up nest project.

NX The "@nx/nest" plugin doesn't yet support the existing TypeScript setup

[gperdomor]

This is related to #28322

[ndcunningham]

Hey, thanks for reporting an issue.

To paraphrase from the above

As mentioned in Nx v20 blog post announcement, if you need to use other plugins while they don't support the new TS setup, please create an empty workspace with the apps preset: npx -y create-nx-workspace@latest --preset=apps

[JohnnyDevNull]

Same for Angular here:

[bdahl1]

I've run into the same issue as Johnny. It seems like this only impacts the generator, so you could build the Library by hand and things would still work, correct? Is there a good example of that floating around somewhere using NX20 and Angular? At least as a workaround until the generator gets fixed?

[coreConvention]

I am also seeing this issue currently. I have been unable find a way around it thus far.

[rajeev-john]

I also faced the same issue of @coreConvention. I got a work around for this by creating a file named eslint.config.js in the working directory. But still not sure if this is the right solution. Looking for the right fix for this

"@nx/angular": "20.1.0",
"@nx/cypress": "20.1.0",
"@nx/eslint": "20.1.0",
"@nx/eslint-plugin": "20.1.0",
"@nx/jest": "20.1.0",
"@nx/js": "20.1.0",
"@nx/workspace": "20.1.0",
"eslint": "9.14.0",
"nx": "20.1.0"

[kasir-barati]

Same here, nx g @nx/js:lib libs/shared --bundler=esbuild --linter=eslint --unitTestRunner=jest --verbose is upset about something since it throws this error message:

Error: Could not find root flat config file
    at getRootESLintFlatConfigFilename (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/@nx+eslint@20.2.1_@babel+traverse@7.26.4_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+help_p7jqooqyk4oi6p3v7733sbzc7e/node_modules/@nx/eslint/src/utils/flat-config.js:18:11)
    at lintConfigHasOverride (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/@nx+eslint@20.2.1_@babel+traverse@7.26.4_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+help_p7jqooqyk4oi6p3v7733sbzc7e/node_modules/@nx/eslint/src/generators/utils/eslint-file.js:179:164)
    at addLint (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/@nx+js@20.2.1_@babel+traverse@7.26.4_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+helpers@_hy7mt26ijjtzogm4skpywoo75e/node_modules/@nx/js/src/generators/library/library.js:292:9)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async libraryGeneratorInternal (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/@nx+js@20.2.1_@babel+traverse@7.26.4_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+helpers@_hy7mt26ijjtzogm4skpywoo75e/node_modules/@nx/js/src/generators/library/library.js:81:30)
    at async /home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/nx@20.2.1_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+helpers@0.5.15__@swc+types@0.1.17_t_w6pixw4aadyn6222jr5o5yzwvy/node_modules/nx/src/command-line/generate/generate.js:240:26
    at async handleErrors (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/nx@20.2.1_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+helpers@0.5.15__@swc+types@0.1.17_t_w6pixw4aadyn6222jr5o5yzwvy/node_modules/nx/src/utils/handle-errors.js:8:24)
    at async Object.handler (/home/kasir/projects/nestjs-materials/typeorm/node_modules/.pnpm/nx@20.2.1_@swc-node+register@1.10.9_@swc+core@1.10.1_@swc+helpers@0.5.15__@swc+types@0.1.17_t_w6pixw4aadyn6222jr5o5yzwvy/node_modules/nx/src/command-line/generate/command-object.js:13:22)

I am using Nx + PNPM + NestJS. I wanted to create a new library but instead I created a new bug. BTW I am not sure if this is somehow also related to this issue I opened here: #28991

Workaround

I renamed my root .eslintrc.json to eslint.config.js

[bdahl1]

Workaround

I renamed my root .eslintrc.json to eslint.config.js

That worked for me too... Very strange

[slyk]

Workaround

I renamed my root .eslintrc.json to eslint.config.js

That worked for me too... Very strange

We can't just rename json to js. But this helped me: https://nx.dev/recipes/tips-n-tricks/flat-config
nx g @nx/eslint:convert-to-flat-config

It does the "renaming :)

[kasir-barati]

@bdahl1 It is happening because some code in Nx expects to find eslint.config.js or eslint.config.cjs:

nx/packages/eslint/src/utils/flat-config.ts

Lines 5 to 17 in 0d1c960

	export const eslintFlatConfigFilenames = [
	'eslint.config.js',
	'eslint.config.cjs',
	];
	export function getRootESLintFlatConfigFilename(tree: Tree): string {
	for (const file of eslintFlatConfigFilenames) {
	if (tree.exists(file)) {
	return file;
	}
	}
	throw new Error('Could not find root flat config file');
	}