(Huge thanks to https://github.com/koluch/esbuild-plugin-sass which this is based off)

esbuild-plugin-postcss

Plugin for esbuild to support PostCSS

Install

npm i esbuild @deanc/esbuild-plugin-postcss

or yarn

yarn add esbuild @deanc/esbuild-plugin-postcss

or pnpm

pnpm add esbuild @deanc/esbuild-plugin-postcss

Usage example

Create file src/test.css:

input[type="text"] {
  border-radius: 1px;
}

Create file src/index.js:

import "./test.css";

Create file build.js:

import esbuild from "esbuild";
import autoprefixer from "autoprefixer";
import postCssPlugin from "@deanc/esbuild-plugin-postcss";

esbuild
  .build({
    entryPoints: ["src/index.js"],
    bundle: true,
    outfile: "bundle.js",
    plugins: [
      postCssPlugin({
        plugins: [autoprefixer()],
      }),
    ],
  })
  .catch((e) => console.error(e.message));

Run:

node build.js

File named bundle.css with appropriate postcss plugins applied.

Requirements

• Node.js 22+

Contributing

• This repo uses pnpm for CI. If you use pnpm locally, run pnpm import once to create pnpm-lock.yaml.

Releases

• The release workflow uses npm trusted publishing with provenance. Ensure trusted publishing is enabled for this package in npm before running the workflow.
• Release checklist:
  1. Ensure CI is green on main.
  2. Verify CHANGELOG.md has entries under [Unreleased].
  3. Run the "Release package" workflow with the desired release type.