# PostCSS Nested Calc [
][PostCSS]
[
][npm-url] [
][css-url] [
][cli-url] [
][discord]
[PostCSS Nested Calc] lets you use nested `calc()` expressions following the [CSS Values and Units 4 specification].
```pcss
.example {
order: calc(1 + calc(2 * 2));
}
/* becomes */
.example {
order: calc(1 + (2 * 2));
order: calc(1 + calc(2 * 2));
}
```
## Usage
Add [PostCSS Nested Calc] to your project:
```bash
npm install postcss @csstools/postcss-nested-calc --save-dev
```
Use it as a [PostCSS] plugin:
```js
const postcss = require('postcss');
const postcssNestedCalc = require('@csstools/postcss-nested-calc');
postcss([
postcssNestedCalc(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
```
[PostCSS Nested Calc] runs in all Node environments, with special
instructions for:
- [Node](INSTALL.md#node)
- [PostCSS CLI](INSTALL.md#postcss-cli)
- [PostCSS Load Config](INSTALL.md#postcss-load-config)
- [Webpack](INSTALL.md#webpack)
- [Next.js](INSTALL.md#nextjs)
- [Gulp](INSTALL.md#gulp)
- [Grunt](INSTALL.md#grunt)
## Options
### preserve
The `preserve` option determines whether the original notation
is preserved. By default the original values are preserved.
```js
postcssNestedCalc({ preserve: false })
```
```pcss
.example {
order: calc(1 + calc(2 * 2));
}
/* becomes */
.example {
order: calc(1 + (2 * 2));
}
```
[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
[css-url]: https://cssdb.org/#nested-calc
[discord]: https://discord.gg/bUadyRwkJS
[npm-url]: https://www.npmjs.com/package/@csstools/postcss-nested-calc
[PostCSS]: https://github.com/postcss/postcss
[PostCSS Nested Calc]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nested-calc
[CSS Values and Units 4 specification]: https://www.w3.org/TR/css-values/#calc-func