export declare function isError(value: unknown): value is Error;
export declare function isErrorLike(value: unknown): value is {
    message?: string;
    stack?: string;
    name?: string;
};
export declare function isString(value: unknown): value is string;
export declare function isNumber(value: unknown): value is number;
export declare function isBoolean(value: unknown): value is boolean;
export declare function isNullish(value: unknown): value is null | undefined;
export declare function getErrorMessage(error: unknown): string;
export declare function getErrorStack(error: unknown): string | undefined;
export declare function getErrorName(error: unknown): string;
export declare function toError(error: unknown, defaultMessage?: string): Error;
export declare function errorToLogContext(error: unknown): Record<string, unknown>;
export declare class EnhancedError extends Error {
    readonly code: string | undefined;
    readonly context: Record<string, unknown> | undefined;
    readonly timestamp: Date;
    readonly operation: string | undefined;
    constructor(message: string, options?: {
        code?: string;
        context?: Record<string, unknown>;
        operation?: string;
        cause?: unknown;
    });
}
export declare function createEnhancedError(message: string, options?: {
    code?: string;
    context?: Record<string, unknown>;
    operation?: string;
    cause?: unknown;
}): EnhancedError;
export declare function withErrorHandling<T extends (...args: any[]) => any>(fn: T, operation: string): T;
export declare function safeExecute<T>(fn: () => T): {
    success: true;
    data: T;
} | {
    success: false;
    error: Error;
};
export declare function safeExecuteAsync<T>(fn: () => Promise<T>): Promise<{
    success: true;
    data: T;
} | {
    success: false;
    error: Error;
}>;
export declare function assertNotNullish<T>(value: T, name: string): NonNullable<T>;
export declare function assertString(value: unknown, name: string): string;
export declare function assertNumber(value: unknown, name: string): number;
export declare function assertBoolean(value: unknown, name: string): boolean;
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