export interface SimpleClassRule {
    matches(tagName: string, classNames: ReadonlySet<string>): boolean;
    declarations: string;
}
export declare function parseStyleDeclarations(style?: string): Array<[string, string]>;
export declare function normalizeStyleDeclarations(style: string): string;
export declare function mergeStyleDeclarations(base: string, override: string): string;
export declare function parseSimpleClassRules(css: string): SimpleClassRule[];
export declare function extractImportURLs(css: string): string[];
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