--- title: "ESLint flat config with EcmaScript modules (mjs) in an NX workspace" url: https://daily.dev/posts/eslint-flat-config-with-ecmascript-modules-mjs-in-an-nx-workspace-zpjtixyeh source_url: https://timdeschryver.dev/blog/eslint-flat-config-with-ecmascript-modules-mjs-in-an-nx-workspace type: article source: "Tim Deschryver" author: "Tim Deschryver" published: 2026-05-31T07:47:16.169Z updated: 2026-06-01T04:01:55.987Z tags: ["webdev", "javascript", "typescript", "angular"] reading_time: 2 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # ESLint flat config with EcmaScript modules (mjs) in an NX workspace **[Tim Deschryver](https://daily.dev/sources/timdeschryver)** · [@timdeschryver](https://daily.dev/timdeschryver) · 2 min read · 0 upvotes · 0 comments ## Summary ESLint v9 introduced the flat config format, but using it with EcmaScript modules (.mjs files) in an NX workspace has a caveat: the NX linter doesn't recognize the .mjs extension. A practical workaround is to use a CommonJS bridge file (eslint.config.cjs) that loads and re-exports the flat config from the .mjs file. The post documents this approach based on lessons learned migrating Angular Testing Library to ESLint v9 flat config in an NX monorepo. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [ESLint v10: Flat Config Completion and JSX Tracking](https://daily.dev/posts/eslint-v10-flat-config-completion-and-jsx-tracking-muqydccwu) · InfoQ · 0 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript), [#typescript](https://daily.dev/tags/typescript), [#angular](https://daily.dev/tags/angular) [View this post on daily.dev](https://daily.dev/posts/eslint-flat-config-with-ecmascript-modules-mjs-in-an-nx-workspace-zpjtixyeh)