@plumelo/thunder

A tiny wrapper around lightningcss that adds a custom resolver and normalizes CSS module exports.

Install

npm install @plumelo/thunder

Usage

import thunder from "@plumelo/thunder";

const result = await thunder({
  filename: "src/styles.css",
  input: `
    .btn { color: red; }
    .btn--lg { font-size: 18px; }
  `,
});

// result.code       — compiled CSS (Buffer)
// result.map        — source map
// result.classes    — camelCased class name mapping
//   e.g. { btn: "btn", btnLg: "btn--lg" }

Resolving imports

Thunder includes a custom resolver that handles @import resolution using enhanced-resolve:

import thunder, { resolver } from "@plumelo/thunder";

const result = await thunder({
  filename: "src/app.css",
  input: `@import "theme.css";`,
  resolver: resolver({
    extensions: [".css", ".scss"],
  }),
});

API

thunder(options): Promise<ThunderResult>

Wraps lightningcss.bundleAsync with:

• Automatic targets — defaults to browserslist targets if not specified
• Custom resolver — uses the built-in resolver by default
• Normalized exports — result.classes is a camelCased map of CSS module class names

resolver(options?)

Returns a resolver object for lightningcss's resolver option. Resolves @import specifiers by:

1. Treating the specifier as a relative path
2. Appending .css if the specifier has no extension
3. Falling back to enhanced-resolve (node_modules resolution)

Exports

Path	Description
@plumelo/thunder	Main API (thunder default export)
@plumelo/thunder/resolve	Resolver utility (resolver export)

License

MIT