import { GraphError } from '../types/errors';
import { Edge, Node } from '../types/graph';
import { Option } from '../types/option';
import { Result } from '../types/result';
/**
 * Type guard to check if a value is a Node.
 * @param value - Value to check
 * @returns true if value is a Node
 */
export declare const isNode: (value: unknown) => value is Node;
/**
 * Type guard to check if a value is an Edge.
 * @param value - Value to check
 * @returns true if value is an Edge
 */
export declare const isEdge: (value: unknown) => value is Edge;
/**
 * Type guard to check if a Result is Ok.
 * @param result - Result to check
 * @returns true if Result is Ok
 */
export declare const isOk: <T, E>(result: Result<T, E>) => result is {
    ok: true;
    value: T;
};
/**
 * Type guard to check if a Result is Err.
 * @param result - Result to check
 * @returns true if Result is Err
 */
export declare const isErr: <T, E>(result: Result<T, E>) => result is {
    ok: false;
    error: E;
};
/**
 * Type guard to check if an Option is Some.
 * @param option - Option to check
 * @returns true if Option is Some
 */
export declare const isSome: <T>(option: Option<T>) => option is {
    some: true;
    value: T;
};
/**
 * Type guard to check if an Option is None.
 * @param option - Option to check
 * @returns true if Option is None
 */
export declare const isNone: <T>(option: Option<T>) => option is {
    some: false;
};
/**
 * Type guard to check if an error is a specific GraphError variant.
 * @param error - Error to check
 * @param type - Error type to match
 * @returns true if error matches the specified type
 * @example
 * ```typescript
 * if (isGraphErrorType(error, 'duplicate-node')) {
 *   console.log('Duplicate node:', error.nodeId);
 * }
 * ```
 */
export declare const isGraphErrorType: <T extends GraphError["type"]>(error: GraphError, type: T) => error is Extract<GraphError, {
    type: T;
}>;
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