> A rspack plugin for Semi Design to custom theme、replace prefix and so on.

Introduction

The plugin is designed for Semi Design, support rspack, provides two major abilities:
- Custom theme
- Replace prefix of CSS selector

> Note: The plugin detects Semi related dependencies by package path. It supports both
> @douyinfe/semi-ui and version-suffixed packages like @douyinfe/semi-ui-19 (also for semi-icons).

Usage

$3

Install @douyinfe/semi-rspack-plugin as a development dependency:

`` shell
npm install --save-dev @douyinfe/semi-rspack-plugin


or


yarn add --dev @douyinfe/semi-rspack-plugin
`

$3

Semi Design uses the Scss variables to extract thousands of Design Tokens. You can replace Token through this plugin to achieve theme customization. More info

You can custom theme through three ways:
- npm package for custom theme
- Local Scss file in your project
- Pass key-value pair parameters to plugin
Priority from low to high.
#### Through npm package

In order to use the npm package, you need to customize the theme through Semi Design System.After finishing the customization, Semi DSM will generate a npm package for you, and then you can use it like this.

` js
// rspack.config.js
const {SemiRspackPlugin} = require('@douyinfe/semi-rspack-plugin');

module.exports = {
// ...
plugins: [
new SemiRspackPlugin({
theme: '@douyinfe/semi-theme-default'
})
]
// ...
};
`

#### Through local Scss file

You can check which tokens can be customized on the Semi WebSite.

- step1: add a local file
` scss
// local.scss
$font-size-small: 16px;

`
- step2: config rspack
` js
// rspack.config.js
const path = require('path');
const {SemiRspackPlugin} = require('@douyinfe/semi-rspack-plugin');

module.exports = {
// ...
plugins: [
new SemiRspackPlugin({
include: path.join(__dirname, 'local.scss')
})
]
};
`

#### Through parameters
` js
// rspack.config.js
const {SemiRspackPlugin} = require('@douyinfe/semi-rspack-plugin');

module.exports = {
// ...
plugins: [
new SemiRspackPlugin({
variables: {
"$font-size-small": '16px'
}
})
]
};
`

$3


The CSS selectors used by Semi Design is prefixed with semi by default(e.g, .semi-button).You can replace the prefix through this plugin.

` js
// rspack.config.js
const {SemiRspackPlugin} = require('@douyinfe/semi-rspack-plugin');

module.exports = {
// ...
plugins: [
new SemiRspackPlugin({
prefixCls: 'custom'
})
]
// ...
};
`

Then you get the replaced CSS selectors(e.g, .custom-button).

Api

$3

#### options.prefixCls

Type: String

The prefix of CSS selector.

#### options.theme

Type: String or Object

When the type is string, it represents the name of npm for custom theme.You can use Semi Design System to custom theme.

##### options.theme.name

Same performance as when the type of options.theme is string.

##### options.include

Type: String

The absolute path of the local Scss file.

##### options.variables

Type: Object

The key-value pair of Scss token.

##### options.omitCss

Type: Boolean

In the compilation phase, whether to exclude css references.Used to solve the problem that Next.js does not support the global introduction of css in third-party code.See this discussion.


##### options.extractCssOptions.loader

Type: String

The path of webpack/rspack loader that extract css.

##### options.extractCssOptions.loaderOptions

Type: Object

The options of webpack/rspack loader that extract css.

#### options.overrideStylesheetLoaders

Type: (loaderList:any[])=>any[]

You can customize how webpack process semi related styles by override the loader with this option. The function will receive the loader list of default loaders(include options.extractCssOptions) and you should return your new loader list. The best practice is just only add your loader to the list rather than delete or change the default loaders since some core logic is in there.


In webpack@5, some hooks need to be obtained through api NormalModule.getCompilationHooks`. But in some scenarios, webpack will not be installed, such as Next.js. Therefore, the user is required to pass in NormalModule as a parameter.