The JS plugin contains executors and generators that are useful for JavaScript/TypeScript projects in an Nx workspace.

Setting Up @nx/js

Installation

Keep Nx Package Versions In Sync

Make sure to install the @nx/js version that matches the version of nx in your repository. If the version numbers get out of sync, you can encounter some difficult to debug errors. You can fix Nx version mismatches with this recipe.

In any Nx workspace, you can install @nx/js by running the following command:

❯

nx add @nx/js

This will install the correct version of @nx/js.

ts Preset

When initializing a new Nx workspace, specifying --preset=ts will generate a workspace with @nx/js pre-installed.

❯

npx create-nx-workspace my-org --preset=ts

Create Libraries

You can add a new JS/TS library with the following command:

Build

You can build libraries that are generated with a bundler specified.

❯

nx g @nx/js:lib my-buildable-lib --bundler=rollup

Nx 15 and lower use @nrwl/ instead of @nx/

Generating a library with --bundler specified will add a build target to the library's project.json file allows the library to be built.

❯

nx build my-buildable-lib

Test

You can test a library with the following command:

❯

nx test my-lib

Lint

You can lint a library with the following command:

❯

nx lint my-lib

Compiler

By default, @nx/js uses TypeScript Compiler (TSC), via @nx/js:tsc executor, to compile your libraries. Optionally, you can switch tsc out for a different compiler with --compiler flag when executing the generators.

Currently, @nx/js supports the following compilers:

SWC

  • Create a buildable library with swc

❯

nx g @nx/js:lib my-swc-lib --bundler=swc

Nx 15 and lower use @nrwl/ instead of @nx/
  • Convert a tsc library to use swc

❯

nx g @nx/js:convert-to-swc my-buildable-lib

Nx 15 and lower use @nrwl/ instead of @nx/

Now the build command will use @nx/js:swc executor to compile your libraries.

The first time you generate a swc library or convert a tsc library over to swc, @nx/js will install the necessary dependencies to use swc.