export type SumiErrorCode = 'INVALID_OPTIONS' | 'INVALID_DIMENSIONS' | 'UNKNOWN_FONT' | 'MALFORMED_FONT' | 'UNSUPPORTED_INPUT' | 'IMAGE_DECODER_REQUIRED' | 'IMAGE_DECODE_FAILED' | 'OUTPUT_TOO_LARGE' | 'UNSUPPORTED_FORMAT' | 'FILE_ALREADY_EXISTS';
export declare class SumiError extends Error {
    readonly code: SumiErrorCode;
    readonly details?: Readonly<Record<string, unknown>>;
    constructor(code: SumiErrorCode, message: string, details?: Readonly<Record<string, unknown>>, cause?: unknown);
}
export declare function assertFinitePositive(value: number, name: string): void;
export declare function assertNonNegativeInteger(value: number, name: string): void;