import { Port } from '../../../types/core';
/**
 * Runtime type guard for Port
 * Validates that an unknown value conforms to the Port interface's required fields
 */
export declare const isPort: (value: unknown) => value is Port;
/**
 * Returns the port if valid, otherwise returns the fallback
 */
export declare const ensurePort: (raw: unknown, fallback: Port) => Port;
declare const InputPortBrand: unique symbol;
declare const OutputPortBrand: unique symbol;
/**
 * Branded type for input ports.
 * Provides compile-time guarantee that a port has type: "input".
 * The brand symbol ensures InputPort and OutputPort are structurally distinct.
 */
export type InputPort = Port & {
    readonly type: "input";
    readonly [InputPortBrand]: never;
};
/**
 * Branded type for output ports.
 * Provides compile-time guarantee that a port has type: "output".
 * The brand symbol ensures InputPort and OutputPort are structurally distinct.
 */
export type OutputPort = Port & {
    readonly type: "output";
    readonly [OutputPortBrand]: never;
};
/**
 * Union type representing either branded port type.
 * Useful for functions that need to accept any validated port.
 */
export type BrandedPort = InputPort | OutputPort;
/**
 * Type guard that narrows Port to InputPort.
 * Use this for conditional checks where you need to verify port direction.
 */
export declare const isInputPort: (port: Port) => port is InputPort;
/**
 * Type guard that narrows Port to OutputPort.
 * Use this for conditional checks where you need to verify port direction.
 */
export declare const isOutputPort: (port: Port) => port is OutputPort;
/**
 * Assertion function that throws if port is not an input port.
 * Use this at function boundaries to enforce correct port direction.
 * @throws Error if port.type !== "input"
 */
export declare function assertInputPort(port: Port): asserts port is InputPort;
/**
 * Assertion function that throws if port is not an output port.
 * Use this at function boundaries to enforce correct port direction.
 * @throws Error if port.type !== "output"
 */
export declare function assertOutputPort(port: Port): asserts port is OutputPort;
export {};