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Jansson"},"license":"MIT","homepage":"https://github.com/postcss/postcss-calc#readme","keywords":["css","postcss","postcss-plugin","calculation","calc"],"repository":{"url":"git+https://github.com/postcss/postcss-calc.git","type":"git"},"description":"PostCSS plugin to reduce calc()","maintainers":[{"email":"rainforest92@126.com","name":"rainfore"},{"email":"wddpwzz36@gmail.com","name":"lip966"},{"email":"13588254504@163.com","name":"linghaha"}],"readme":"# PostCSS Calc [\"PostCSS\"][PostCSS]\n\n[![NPM Version][npm-img]][npm-url]\n[![Build Status][cli-img]][cli-url]\n[![Support Chat][git-img]][git-url]\n\n[PostCSS Calc] lets you reduce `calc()` references whenever it's possible. This\ncan be particularly useful with the [PostCSS Custom Properties] plugin.\n\nWhen multiple units are mixed together in the same expression, the `calc()`\nstatement is left as is, to fallback to the [W3C calc() implementation].\n\n## Installation\n\n```bash\nnpm install postcss-calc\n```\n\n## Usage\n\n```js\n// dependencies\nvar fs = require(\"fs\")\nvar postcss = require(\"postcss\")\nvar calc = require(\"postcss-calc\")\n\n// css to be processed\nvar css = fs.readFileSync(\"input.css\", \"utf8\")\n\n// process css\nvar output = postcss()\n .use(calc())\n .process(css)\n .css\n```\n\n**Example** (with [PostCSS Custom Properties] enabled as well):\n\n```js\n// dependencies\nvar fs = require(\"fs\")\nvar postcss = require(\"postcss\")\nvar customProperties = require(\"postcss-custom-properties\")\nvar calc = require(\"postcss-calc\")\n\n// css to be processed\nvar css = fs.readFileSync(\"input.css\", \"utf8\")\n\n// process css\nvar output = postcss()\n .use(customProperties())\n .use(calc())\n .process(css)\n .css\n```\n\nUsing this `input.css`:\n\n```css\n:root {\n --main-font-size: 16px;\n}\n\nbody {\n font-size: var(--main-font-size);\n}\n\nh1 {\n font-size: calc(var(--main-font-size) * 2);\n height: calc(100px - 2em);\n margin-bottom: calc(\n var(--main-font-size)\n * 1.5\n )\n}\n```\n\nyou will get:\n\n```css\nbody {\n font-size: 16px\n}\n\nh1 {\n font-size: 32px;\n height: calc(100px - 2em);\n margin-bottom: 24px\n}\n```\n\nCheckout [tests] for more examples.\n\n### Options\n\n#### `precision` (default: `5`)\n\nAllow you to define the precision for decimal numbers.\n\n```js\nvar out = postcss()\n .use(calc({precision: 10}))\n .process(css)\n .css\n```\n\n#### `preserve` (default: `false`)\n\nAllow you to preserve calc() usage in output so browsers will handle decimal\nprecision themselves.\n\n```js\nvar out = postcss()\n .use(calc({preserve: true}))\n .process(css)\n .css\n```\n\n#### `warnWhenCannotResolve` (default: `false`)\n\nAdds warnings when calc() are not reduced to a single value.\n\n```js\nvar out = postcss()\n .use(calc({warnWhenCannotResolve: true}))\n .process(css)\n .css\n```\n\n#### `mediaQueries` (default: `false`)\n\nAllows calc() usage as part of media query declarations.\n\n```js\nvar out = postcss()\n .use(calc({mediaQueries: true}))\n .process(css)\n .css\n```\n\n#### `selectors` (default: `false`)\n\nAllows calc() usage as part of selectors.\n\n```js\nvar out = postcss()\n .use(calc({selectors: true}))\n .process(css)\n .css\n```\n\nExample:\n\n```css\ndiv[data-size=\"calc(3*3)\"] {\n width: 100px;\n}\n```\n\n---\n\n## Contributing\n\nWork on a branch, install dev-dependencies, respect coding style & run tests\nbefore submitting a bug fix or a feature.\n\n```bash\ngit clone git@github.com:postcss/postcss-calc.git\ngit checkout -b patch-1\nnpm install\nnpm test\n```\n\n## [Changelog](CHANGELOG.md)\n\n## [License](LICENSE)\n\n[cli-img]: https://img.shields.io/travis/postcss/postcss-calc/master.svg\n[cli-url]: https://travis-ci.org/postcss/postcss-calc\n[git-img]: https://img.shields.io/badge/support-chat-blue.svg\n[git-url]: https://gitter.im/postcss/postcss\n[npm-img]: https://img.shields.io/npm/v/postcss-calc.svg\n[npm-url]: https://www.npmjs.com/package/postcss-calc\n\n[PostCSS]: https://github.com/postcss\n[PostCSS Calc]: https://github.com/postcss/postcss-calc\n[PostCSS Custom Properties]: https://github.com/postcss/postcss-custom-properties\n[tests]: src/__tests__/index.js\n[W3C calc() implementation]: https://www.w3.org/TR/css3-values/#calc-notation\n","readmeFilename":"README.md"}