import type { TransportRecord, TransportTarget, TransportOptions, ITransport, ITransportManager, LogLevel } from '../types/index.js';
/**
 * Constructor signature for transports registered in the built-in registry.
 * Accepts the transport's own options type; pass-through is enforced at
 * registration time via TypeScript but erased at runtime.
 */
export type TransportConstructor = new (options?: TransportOptions) => ITransport;
export declare class TransportManager implements ITransportManager {
    private transports;
    private defaultLevel;
    private readonly registry;
    constructor(defaultLevel?: LogLevel);
    /**
     * Registers a custom transport under a string name. Once registered,
     * `addTransport({ target: 'name', options })` instantiates it.
     *
     * @example
     * transportManager.register('datadog', DatadogTransport);
     * transportManager.add({ target: 'datadog', options: { apiKey: env('DD_KEY') } });
     *
     */
    register(name: string, ctor: TransportConstructor): void;
    /**
     * Lists all registered transport names (built-ins + custom).
     *
     */
    listRegistered(): string[];
    add(target: TransportTarget): string;
    remove(id: string): boolean;
    write(record: TransportRecord): Promise<void>;
    flush(): Promise<void>;
    close(): Promise<void>;
    get count(): number;
    list(): string[];
}
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