export type MainLogLevel = 'debug' | 'info' | 'warn' | 'error';
export interface MainLogFields {
    [key: string]: unknown;
}
export interface MainLoggerOptions {
    directory: string;
    appId: string;
    productName: string;
    version: string;
    /** Rotates before an append would exceed this size. Default 5 MiB. */
    maxBytes?: number;
    /** Number of rotated files retained in addition to the active file. Default 5. */
    maxFiles?: number;
    /** Also mirror records to stdout/stderr. Default true. */
    console?: boolean;
}
export interface DiagnosticReportOptions {
    /** Include bounded tails of framework log files. Default true. */
    includeLogs?: boolean;
    /** Maximum bytes read from each log file. Default 256 KiB. */
    maxLogBytes?: number;
    /** App-owned diagnostic state. Secret-looking fields are redacted. */
    extra?: MainLogFields;
}
export interface MainLogger {
    readonly path: string;
    debug(message: string, fields?: MainLogFields): void;
    info(message: string, fields?: MainLogFields): void;
    warn(message: string, fields?: MainLogFields): void;
    error(message: string, fields?: MainLogFields): void;
    flush(): Promise<void>;
    createDiagnosticReport(options?: DiagnosticReportOptions): Promise<string>;
}
/** Create the structured, rotating logger attached to every Node Main context. */
export declare function createMainLogger(options: MainLoggerOptions): MainLogger;
/** @internal Reused by crash-reports.ts so every capture path bounds strings the same way. */
export declare function boundedString(value: unknown, maxLength?: number): string;
/** @internal Reused by crash-reports.ts so crash `extra` fields are redacted the same way as log fields. */
export declare function redactFields(fields: MainLogFields): MainLogFields;
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