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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, mode = 'auto')
Extracts and remove (if removeRules is equal true) from PostCSS tree `:import`, `@icss-import`, `:export` and `@icss-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'
}
}
*/
```
By default both the pseudo and at-rule form of the import and export statements
will be removed. Pass the `mode` option to limit to only one type.
## createICSSRules(icssImports, icssExports, mode = 'rule')
Converts icss imports and exports definitions to postcss ast
```js
createICSSRules(
{
colors: {
a: "b",
},
},
{
c: "d",
},
// Need pass `rule` and `decl` from postcss
// Please look at `Step 4` https://evilmartians.com/chronicles/postcss-8-plugin-migration
postcss
);
```
By default it will create pseudo selector rules (`:import` and `:export`). Pass
`at-rule` for `mode` to instead generate `@icss-import` and `@icss-export`, which
may be more resilient to post processing by other tools.
## License
ISC
---
Glen Maddern, Bogdan Chadkin and Evilebottnawi 2015-present.