import type { OneSubConfig } from '@onesub/shared';
/**
 * Logger used throughout the SDK. Wraps the host-provided `config.logger`
 * (or `console` if omitted) and adds a `trace` level that's a no-op unless
 * `config.debug === true`. Every call is tagged with `[onesub]` so host-app
 * logs stay greppable.
 *
 * `trace` is intended for lifecycle breadcrumbs (IAP connection, listener
 * events, in-flight matches, validation requests/responses, finishTransaction
 * calls). `info` / `warn` / `error` are production-safe.
 */
export interface SdkLogger {
    trace(...args: unknown[]): void;
    info(...args: unknown[]): void;
    warn(...args: unknown[]): void;
    error(...args: unknown[]): void;
}
export declare function createSdkLogger(config: Pick<OneSubConfig, 'debug' | 'logger'>): SdkLogger;
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