PostCSS plugin to reduce calc()
npm install @weapp-tailwindcss/postcss-calc[![NPM Version][npm-img]][npm-url]
[![Support Chat][git-img]][git-url]
Fork from postcss-calc@10.1.1
[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].
``bash`
npm install postcss-calc
`js
// 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:
`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:
`css`
h1 {
font-size: 32px;
height: calc(100px - 2em);
width: calc(2*var(--base-width));
margin-bottom: 24px
}
Checkout [tests] for more examples.
#### precision (default: 5)
Allow you to define the precision for decimal numbers.
`js`
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.
`js`
var out = postcss()
.use(calc({preserve: true}))
.process(css)
.css
#### warnWhenCannotResolve (default: false)
Adds warnings when calc() are not reduced to a single value.
`js`
var out = postcss()
.use(calc({warnWhenCannotResolve: true}))
.process(css)
.css
#### mediaQueries (default: false)
Allows calc() usage as part of media query declarations.
`js`
var out = postcss()
.use(calc({mediaQueries: true}))
.process(css)
.css
#### selectors (default: false)
Allows calc() usage as part of selectors.
`js`
var out = postcss()
.use(calc({selectors: true}))
.process(css)
.css
Example:
`css`
div[data-size="calc(3*3)"] {
width: 100px;
}
---
Work on a branch, install dev-dependencies, respect coding style & run tests
before submitting a bug fix or a feature.
`bash``
git clone git@github.com:postcss/postcss-calc.git
git checkout -b patch-1
npm install
npm test
[git-img]: https://img.shields.io/badge/support-chat-blue.svg
[git-url]: https://gitter.im/postcss/postcss
[npm-img]: https://img.shields.io/npm/v/postcss-calc.svg
[npm-url]: https://www.npmjs.com/package/postcss-calc
[PostCSS]: https://github.com/postcss
[PostCSS Calc]: https://github.com/postcss/postcss-calc
[PostCSS Custom Properties]: https://github.com/postcss/postcss-custom-properties
[tests]: src/__tests__/index.js
[W3C calc() implementation]: https://www.w3.org/TR/css3-values/#calc-notation