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@projectwallace/format-css

v1.5.1

Published

Fast, small, zero-config library to format CSS with basic rules.

Downloads

614

Readme

format-css

Fast, small, zero-config library to format CSS with basic rules. The design goal is to format CSS in a way that makes it easy to inspect. Bundle size and runtime speed are more important than versatility and extensibility.

Example output

/* TURN THIS: */

@layer base.normalize{@media (dynamic-range:high) or (color-gamut:p3){@supports (color:color(display-p3 0 0 0)){:where(html){--link:color(display-p3 .1 .4 1);--link-visited:color(display-p3 .6 .2 1)}}}}@layer base.normalize{:where(html) :where(dialog){background-color:var(--surface-1)}}

/* INTO THIS: */

@layer base.normalize {
	@media (dynamic-range: high) or (color-gamut: p3) {
		@supports (color: color(display-p3 0 0 0)) {
			:where(html) {
				--link: color(display-p3 .1 .4 1);
				--link-visited: color(display-p3 .6 .2 1);
			}
		}
	}
}

@layer base.normalize {
	:where(html) :where(dialog) {
		background-color: var(--surface-1);
	}
}

/* AND BACK AGAIN! */

Installation

npm install @projectwallace/format-css

Usage

import { format } from "@projectwallace/format-css";

let old_css = "/* Your old CSS here */";
let new_css = format(old_css);

Need more examples?

Formatting rules

  1. Every AtRule starts on a new line
  2. Every Rule starts on a new line
  3. Every Selector starts on a new line
  4. A comma is placed after every Selector that’s not the last in the SelectorList
  5. Every Block is indented with 1 tab more than the previous indentation level
  6. Every Declaration starts on a new line
  7. Every Declaration ends with a semicolon (;)
  8. An empty line is placed after a Block unless it’s the last in the surrounding Block
  9. Multiline tokens like Selectors, Values, etc. are rendered on a single line
  10. Unknown syntax is rendered as-is, with multi-line formatting kept intact

Minify CSS

This package also exposes a minifier function since minifying CSS follows many of the same rules as formatting.

import { format, minify } from "@projectwallace/format-css";

let minified = minify("a {}");

// which is an alias for

let formatted_mini = format("a {}", { minify: true });

Acknowledgements

  • Thanks to CSSTree for providing the necessary parser and the interfaces for our CSS Types (the bold elements in the list above)

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