import { postcss } from '@weapp-tailwindcss/postcss';
export declare function splitUserCssLayerBlocks(source: string): {
    layer: string;
    rest: string;
};
export declare function hasUserCssLayerBlocks(source: string): boolean;
export declare function extractGeneratedCssForUserLayerSelectors(css: string, userLayerSource: string): {
    layer: string;
    rest: string;
};
export declare function normalizeGeneratedSelector(selector: string): string;
export declare function collectApplyOnlySourceSelectors(source: string): Set<string>;
export declare function hasOnlyApplyBackedSourceRules(source: string): boolean;
export declare function removeCssComments(css: string): string;
export declare function isEmptyCustomVariantBlock(rule: postcss.AtRule): boolean;