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[](https://travis-ci.org/css-modules/icss-utils)
# ICSS Utils
## replaceSymbols
Governs the way tokens are searched & replaced during the linking stage of ICSS loading.
This is broken into its own module in case the behaviour needs to be replicated in other PostCSS plugins
(i.e. [CSS Modules Values](https://github.com/css-modules/postcss-modules-values))
```js
import { replaceSymbols, replaceValueSymbols } from "icss-utils"
replaceSymbols(css, replacements)
replaceValueSymbols(string, replacements)
```
Where:
- `css` is the PostCSS tree you're working with
- `replacements` is an JS object of `symbol: "replacement"` pairs, where all occurrences of `symbol` are replaced with `replacement`.
A symbol is a string of alphanumeric, `-` or `_` characters. A replacement can be any string. They are replaced in the following places:
- In the value of a declaration, i.e. `color: my_symbol;` or `box-shadow: 0 0 blur spread shadow-color`
- In a media expression i.e. `@media small {}` or `@media screen and not-large {}`
## extractICSS(css, removeRules = true)
Extracts and remove (if removeRules is equal true) from PostCSS tree `:import` and `:export` statements.
```js
import postcss from 'postcss';
import { extractICSS } from 'icss-utils'
const css = postcss.parse(`
:import(colors) {
a: b;
}
:export {
c: d;
}
`)
extractICSS(css)
/*
{
icssImports: {
colors: {
a: 'b'
}
},
icssExports: {
c: 'd'
}
}
*/
```
## createICSSRules(icssImports, icssExports)
Converts icss imports and exports definitions to postcss ast
```js
createICSSRules({
colors: {
a: 'b'
}
}, {
c: 'd'
})
```
## License
ISC
---
Glen Maddern and Bogdan Chadkin, 2015.
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