import type { SchemaBase } from './dsl.js';
/** One end of a field rule (e.g. 'fen' / 'yuan', 'plain' / 'cipher', 'raw' / 'masked'). */
export interface FieldRuleEnd {
    /** End name — written back by defineFieldRule from the ends map key. */
    name: string;
    description?: string;
}
/** A semantic transformation rule between two field representations. */
export interface FieldRuleSchema extends SchemaBase {
    type: 'fieldRule';
    /** Rule name — the semantic uniqueness key. */
    name: string;
    /** The two ends of the rule, keyed by end name. */
    ends: Record<string, FieldRuleEnd>;
}
export declare function defineFieldRule(options: {
    name: string;
    ends: Record<string, Omit<FieldRuleEnd, 'name'>>;
    description?: string;
}): FieldRuleSchema;