A nodejs loader for postcss. This allows you to load CSS files into NodeJS programs by converting them into Javascript modules. The returned ES module has a default property whose value is the compiled CSS string.

npm install --save @node-loader/postcss

Node 16.12 changed the hooks used in NodeJS loaders. If using Node<16.12, use @node-loader/postcss@1. Otherwise, use @node-loader/postcss@latest.

Create a postcss.config.js file in your current working directory. Now run node with the --loader (or --experimental-loader for older NodeJS version) flag:

node --loader @node-loader/postcss file.js

Now you can import CSS files as ES modules in your NodeJS project:

import cssString from "./main.css"; console.log( "After PostCSS processing, the main.css file content is", cssString );

By default, node-loader postcss looks for a configuration file called postcss.config.js in the current working directory. To specify the file path to the configuration file, provide the POSTCSS_CONFIG environment variable:

POSTCSS_CONFIG=/Users/name/some/dir/.postcssrc node --loader @node-loader/postcss file.js

If you wish to combine postcss loading with other NodeJS loaders, you may do so by using node-loader-core.