An extremely lightweight bundler that does nothing but merge your css files using the import syntax.

The end result is you can use your css files directly in the browser without being bundled, or you can use the bundle. They should both be interchangeable.

You can import files via their relative path, or resolve them from node modules.

npm install --save-dev cssbun

(or) globally:

npm install --global cssbun

Check out the test scenarios here to see some example usages.

cssbun -o bundled.css css/index.css

Optional arguments are:

--watch (-w) [pattern]         rerun when the files change (default pattern is '**/*.css')
--output (-o) fileName         output the bundle to a file instead of to stdout

import cssbun from 'cssbun';
const bundled = cssbun('./css/index.css');
console.log(bundled);

To include another css file in your entrypoint (or any included file) use the @import feature:

Note: Any @import url("???") will not be parsed, and will stay in your bundle as intended.

/* import a node module's main entrypoint */
@import "ress";

/* import a specific file from a node module */
@import "ress/dist/ress.min.css";

/* import a local file */
@import "./included.css";

/* import at runtime (don't bundle) */
@import url("https://unpkg.com/ress/dist/ress.min.css");

.test {
  background-color: blue;
}

To import with media query and / or supports condition

@import "./index-p3.css" supports(color: color(display-p3 1 0 0)) (color-gamut: p3);

To import with layer name

@layer reset, self;

@import "./reset.css" layer(reset);

@layer self {
  fieldset {
    border-radius: 2px;
  }
}

Notes:

• Avoid mixed line-endings (LF and CRLF) in css files, since cssbun doesn't normalize line-endings.
• It is recommended to add editorconfig insert_final_newline = true for css files, or output css may look weird.