import { LoggerOptions, Logger } from 'pino';
import { Config } from '@contrast/config';
import { Messages, ThreadTransferData } from '@contrast/common';
import Perf from '@contrast/perf';
export interface Core {
    readonly config: Config;
    readonly messages: Messages;
    readonly Perf: typeof Perf;
    readonly threadTransferData?: ThreadTransferData;
}
export { Logger };
export declare const kChildren: unique symbol;
export default function init(core: Core & {
    logger?: Logger;
}, opts?: LoggerOptions): Logger;
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