import type { FileValidationRule, FileValidationRuleSets } from './file-validation-types';
export declare const toRuleSets: (rules: FileValidationRule[] | FileValidationRuleSets) => FileValidationRuleSets;
/**
 * Union of every rule's `accept` across all sets, de-duplicated — the native picker filter /
 * drag-over hint a containing cmp shows so a file matching any set can be selected.
 */
export declare const deriveAccept: (rules: FileValidationRule[] | FileValidationRuleSets) => string;
export declare const pickRuleSet: (file: File, sets: FileValidationRuleSets) => FileValidationRule[] | null;