export type LogLevel = "debug" | "info" | "warn" | "error";
export interface LogEntry {
    ts: string;
    level: LogLevel;
    event: string;
    [field: string]: unknown;
}
export declare class Logger {
    #private;
    constructor(opts?: {
        sink?: (e: LogEntry) => void;
        level?: LogLevel;
        base?: Record<string, unknown>;
    });
    log(level: LogLevel, event: string, fields?: Record<string, unknown>): void;
    debug(event: string, fields?: Record<string, unknown>): void;
    info(event: string, fields?: Record<string, unknown>): void;
    warn(event: string, fields?: Record<string, unknown>): void;
    error(event: string, fields?: Record<string, unknown>): void;
    /**
     * A logger that adds `fields` to every entry (request/actor context).
     *
     * The level carries over. Attaching context is not a decision about how much to log, and
     * omitting it here silently reset the child to the `info` default — so a child of a
     * warn-level logger logged MORE than its parent, and a child of a debug-level one logged
     * less. Either way the threshold the caller set stopped applying at the first `child()`.
     */
    child(fields: Record<string, unknown>): Logger;
}
/** Silent (default for libraries/tests). */
export declare function silentLogger(): Logger;
/** Emit one JSON object per line to stderr (default for CLI/servers). */
export declare function consoleLogger(level?: LogLevel): Logger;
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