/**
 * Input Validation — Schema validation for test YAML, trace JSON, config files, and CLI arguments.
 *
 * Provides user-friendly error messages with "did you mean?" suggestions.
 */
/**
 * Validation error with location context.
 */
export interface ValidationError {
    path: string;
    message: string;
    suggestion?: string;
}
/**
 * Result of validation.
 */
export interface ValidationResult {
    valid: boolean;
    errors: ValidationError[];
}
/**
 * Validate a test suite YAML structure.
 */
export declare function validateSuite(data: any): ValidationResult;
/**
 * Validate an expectations object for unknown/misspelled assertion keys.
 */
export declare function validateExpectations(expect: any, pathPrefix?: string): ValidationError[];
/**
 * Validate a trace JSON structure.
 */
export declare function validateTrace(data: any): ValidationResult;
/**
 * Format validation errors for CLI output.
 */
export declare function formatValidationErrors(errors: ValidationError[]): string;
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