/**
 * Base error class for all Guarden errors.
 * Provides clean stack traces and error identification.
 */
export declare class GuardenError extends Error {
    readonly code: string;
    constructor(message: string, code: string);
}
/**
 * Thrown when a runtime assertion fails.
 */
export declare class AssertionError extends GuardenError {
    constructor(message: string);
}
/**
 * Thrown when an invariant is violated.
 * Indicates a bug in the program logic.
 */
export declare class InvariantError extends GuardenError {
    constructor(message: string);
}
/**
 * Thrown when type coercion fails.
 */
export declare class CoercionError extends GuardenError {
    readonly originalValue: unknown;
    readonly targetType: string;
    constructor(value: unknown, targetType: string);
}
/**
 * Thrown when environment variable validation fails.
 */
export declare class EnvValidationError extends GuardenError {
    readonly variableName: string;
    readonly errors: string[];
    constructor(variableName: string, errors: string[]);
}
/**
 * Thrown when multiple environment variables fail validation.
 */
export declare class EnvConfigError extends GuardenError {
    readonly validationErrors: EnvValidationError[];
    constructor(errors: EnvValidationError[]);
}
/**
 * Thrown when code reaches a state that should be unreachable.
 */
export declare class UnreachableError extends GuardenError {
    constructor(value: never);
}
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