Skip to content

postcss/postcss-calc

master
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
 
 
src
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

PostCSS Calc PostCSS

NPM Version Support Chat

PostCSS Calc lets you reduce calc() references whenever it's possible. When multiple units are mixed together in the same expression, the calc() statement is left as is, to fallback to the W3C calc() implementation.

Installation

npm install postcss-calc

Usage

// dependencies
var fs = require("fs")
var postcss = require("postcss")
var calc = require("postcss-calc")

// css to be processed
var css = fs.readFileSync("input.css", "utf8")

// process css
var output = postcss()
  .use(calc())
  .process(css)
  .css

Using this input.css:

h1 {
  font-size: calc(16px * 2);
  height: calc(100px - 2em);
  width: calc(2*var(--base-width));
  margin-bottom: calc(16px * 1.5);
}

you will get:

h1 {
  font-size: 32px;
  height: calc(100px - 2em);
  width: calc(2*var(--base-width));
  margin-bottom: 24px
}

Checkout tests for more examples.

Options

precision (default: 5)

Allow you to define the precision for decimal numbers.

var out = postcss()
  .use(calc({precision: 10}))
  .process(css)
  .css

preserve (default: false)

Allow you to preserve calc() usage in output so browsers will handle decimal precision themselves.

var out = postcss()
  .use(calc({preserve: true}))
  .process(css)
  .css

warnWhenCannotResolve (default: false)

Adds warnings when calc() are not reduced to a single value.

var out = postcss()
  .use(calc({warnWhenCannotResolve: true}))
  .process(css)
  .css

mediaQueries (default: false)

Allows calc() usage as part of media query declarations.

var out = postcss()
  .use(calc({mediaQueries: true}))
  .process(css)
  .css

selectors (default: false)

Allows calc() usage as part of selectors.

var out = postcss()
  .use(calc({selectors: true}))
  .process(css)
  .css

Example:

div[data-size="calc(3*3)"] {
  width: 100px;
}

Related PostCSS plugins

To replace the value of CSS custom properties at build time, try PostCSS Custom Properties.

Contributing

Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.

git clone git@github.com:postcss/postcss-calc.git
git checkout -b patch-1
npm install
npm test

Changelog

License