export type LogLevel = "silent" | "error" | "warn" | "info" | "debug" | "trace";
export interface DiagnosticLogEvent {
    level: Exclude<LogLevel, "silent">;
    message: string;
    category?: "runtime" | "http" | "auth" | "retry" | "progress";
    data?: Record<string, unknown>;
}
export interface RuntimeLogger {
    level: LogLevel;
    emit(event: DiagnosticLogEvent): void;
}
export type RuntimeLoggerInput = RuntimeLogger | ((event: DiagnosticLogEvent) => void);
export declare const LOG_LEVELS: readonly ["silent", "error", "warn", "info", "debug", "trace"];
export declare function isLogLevel(value: string): value is LogLevel;
export declare function shouldEmitDiagnostic(eventLevel: LogLevel, configuredLevel: LogLevel): boolean;
export declare function createRuntimeLogger(options?: {
    level?: LogLevel;
    logger?: RuntimeLoggerInput;
}): RuntimeLogger;