import { RuleBuilder } from "../rule-builder";
import { FieldControlType } from "./field-definition";
/**
 * Base operators defined inside RuleBuilder.
 */
type RuleOperatorBase = keyof typeof RuleBuilder.value;
/**
 * Special operator that represents a field reference.
 */
type RuleOperatorSpecial = "var";
/**
 * Union of all operator keys supported by the system.
 */
export type RuleOperatorKey = RuleOperatorBase | RuleOperatorSpecial;
/**
 * Defines the kind of value an operator expects:
 * - "list": expects an array of values
 * - "single": expects a single value
 * - "none": no value required (boolean-like)
 * - "field": expects a reference to another field
 * - undefined: not specified
 */
export type RuleOperatorValueType = "list" | "single" | "none" | "field" | undefined;
/**
 * Metadata for describing how an operator behaves.
 */
export interface RuleOperatorMeta<TCustom extends string = never> {
    /** Label to display in the UI (can be customized by consumers). */
    label: string;
    /** Which field types this operator is allowed for. */
    allowedTypes?: FieldControlType<TCustom>[] | "all";
    /** Exclude field types by using this operator */
    disallowedTypes?: FieldControlType<TCustom>[];
    /** The type of value this operator requires. */
    valueType?: RuleOperatorValueType;
    /** If true, the operator will be hidden from the UI picker. */
    hideFromPicker?: boolean;
}
export type RuleOperatorMetaPatch<TCustom extends string = never> = Partial<RuleOperatorMeta<TCustom>>;
export type RuleOperatorPatches<TCustom extends string = never> = Partial<Record<RuleOperatorKey, RuleOperatorMetaPatch<TCustom>>>;
export type RuleOperatorsMap<TCustom extends string = never> = Partial<Record<RuleOperatorKey, RuleOperatorMeta<TCustom>>>;
/**
 * Default operator map shipped with `@form-flow/core`.
 * Consumers may override or extend this map at runtime.
 */
export declare const FORM_FLOW_OPERATORS_MAP: RuleOperatorsMap;
export {};
//# sourceMappingURL=operators.d.ts.map