import { InvalidInputError, InvalidWeightError, NegativeWeightError } from '../types/errors';
import { Edge } from '../types/graph';
import { Result } from '../types/result';
/**
 * Validate that input is not null or undefined.
 * @param input - Input to validate
 * @param name - Name of input for error message
 * @returns Ok(void) if valid, Err(InvalidInputError) if null/undefined
 */
export declare const validateNotNull: (input: unknown, name: string) => Result<void, InvalidInputError>;
/**
 * Validate edge weight is a valid number (not NaN, not Infinity).
 * @param edge - Edge to validate
 * @returns Ok(void) if valid, Err(InvalidWeightError) if invalid
 */
export declare const validateEdgeWeight: (edge: Edge) => Result<void, InvalidWeightError>;
/**
 * Validate edge weight is non-negative (for Dijkstra's algorithm).
 * @param edge - Edge to validate
 * @returns Ok(void) if valid, Err(NegativeWeightError) if negative
 */
export declare const validateNonNegativeWeight: (edge: Edge) => Result<void, NegativeWeightError>;
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