/**
 * Domain errors for WebSpec.
 *
 * All errors extend WebSpecError to provide a common base class
 * and support for error chaining with cause.
 */
/** Base class for all WebSpec-specific errors. */
export declare class WebSpecError extends Error {
    readonly cause?: Error | undefined;
    constructor(message: string, cause?: Error | undefined);
}
/** Raised when a spec or config file fails schema validation. */
export declare class ValidationError extends WebSpecError {
    readonly errors: readonly string[];
    constructor(message: string, errors: readonly string[]);
}
/** Raised when a spec step fails during runtime execution. */
export declare class StepError extends WebSpecError {
    readonly stepIndex: number;
    readonly command: string;
    constructor(message: string, stepIndex: number, command: string, cause?: Error);
}
/** Raised when a runFlow reference creates a circular dependency. */
export declare class CircularFlowError extends WebSpecError {
    readonly cycle: readonly string[];
    constructor(cycle: readonly string[]);
}
/** Raised when a referenced flow file cannot be found. */
export declare class FlowNotFoundError extends WebSpecError {
    readonly flowPath: string;
    constructor(flowPath: string);
}
/** Raised when the user requests a mobile/native app test. */
export declare class MobileNotSupportedError extends WebSpecError {
    constructor();
}
/** Raised when a required config key is missing. */
export declare class ConfigError extends WebSpecError {
    constructor(message: string);
}
/**
 * Format an error for user-facing display.
 */
export declare function formatError(err: unknown): string;
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