purgecss-webpack-plugin

type BlocklistFunction = () => StringRegExpArray;

type ComplexSafelist = {
    standard?: StringRegExpArray;
    /**
     * You can safelist selectors and their children based on a regular
     * expression with `safelist.deep`
     *
     * @example
     *
     * ```ts
     * const purgecss = await new PurgeCSS().purge({
     *   content: [],
     *   css: [],
     *   safelist: {
     *     deep: [/red$/]
     *   }
     * })
     * ```
     *
     * In this example, selectors such as `.bg-red .child-of-bg` will be left
     * in the final CSS, even if `child-of-bg` is not found.
     *
     */
    deep?: RegExp[];
    greedy?: RegExp[];
    variables?: StringRegExpArray;
    keyframes?: StringRegExpArray;
};

type ExtractorFunction<T = string> = (content: T) => ExtractorResult;

type ExtractorResult = ExtractorResultDetailed | string[];

type PathFunction = () => string[];

type PurgedStats = {
    [index: string]: string[];
};

type SafelistFunction = () => ComplexSafelist;

type StringRegExpArray = Array<RegExp | string>;

type UserDefinedOptions = Omit<
    PurgeCSSUserDefinedOptions,
    'css' | 'content' | 'safelist' | 'blocklist' | 'sourceMap'
> & {
    paths: string[] | PathFunction;
    moduleExtensions?: string[];
    verbose?: boolean;
    safelist: PurgeCSSUserDefinedOptions['safelist'] | SafelistFunction;
    blocklist: PurgeCSSUserDefinedOptions['blocklist'] | BlocklistFunction;
    only?: string[];
};

type UserDefinedSafelist = StringRegExpArray | ComplexSafelist;