/**
 * Function Registry Service
 *
 * Manages custom and built-in condition functions for the ABAC engine.
 * Functions can be used in FunctionCondition evaluations within policies.
 */
import { ConditionFunction } from '../types';
/**
 * Service for managing condition functions
 */
export declare class FunctionRegistry {
    private functions;
    constructor();
    /**
     * Register a custom function
     *
     * @param name - Function name (used in policies)
     * @param fn - Function implementation
     */
    register(name: string, fn: ConditionFunction): void;
    /**
     * Get a function by name
     *
     * @param name - Function name
     * @returns Function implementation or undefined
     */
    get(name: string): ConditionFunction | undefined;
    /**
     * Check if a function is registered
     *
     * @param name - Function name
     * @returns true if registered, false otherwise
     */
    has(name: string): boolean;
    /**
     * Remove a function
     *
     * @param name - Function name
     * @returns true if removed, false if not found
     */
    remove(name: string): boolean;
    /**
     * Get all registered function names
     *
     * @returns Array of function names
     */
    getRegisteredFunctions(): string[];
    /**
     * Clear all custom functions (keeps built-in functions)
     */
    clearCustomFunctions(): void;
    /**
     * Clear all functions including built-in ones
     */
    clearAll(): void;
    /**
     * Get built-in function names
     *
     * @returns Array of built-in function names
     */
    private getBuiltInFunctionNames;
    /**
     * Register built-in functions
     */
    private registerBuiltInFunctions;
    /**
     * Reset to default state (only built-in functions)
     */
    reset(): void;
}
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