export type LogLevelName = "trace" | "debug" | "info" | "warn" | "error" | "fatal" | "silent";
export type RuntimeLogLevel = Exclude<LogLevelName, "silent">;
export type TimestampMode = "iso" | "epoch" | "none";
export type LogRecord = Record<string, unknown>;
export interface LogSink {
    isTTY?: boolean;
    write(line: string): void;
    flush?(): void | Promise<void>;
    close?(): void | Promise<void>;
}
export interface PrettyFormatterOptions {
    ignore?: string;
    singleLine?: boolean;
    color?: boolean;
}
export interface LoggerRedactionOptions {
    keys?: string[];
    paths?: string[];
    value?: string;
}
export interface LevelController {
    level: LogLevelName;
    value: number;
}
export interface LoggerCoreOptions {
    level?: LogLevelName;
    sink: LogSink;
    bindings?: LogRecord;
    timestamp?: TimestampMode;
    format?: "json" | "pretty";
    pretty?: PrettyFormatterOptions;
    pid?: number;
    hostname?: string;
    contextProvider?: () => LogRecord | void;
    mixin?: () => LogRecord | void;
    redaction?: LoggerRedactionOptions;
}
export interface CompiledLoggerCoreOptions {
    level: LogLevelName;
    levelController: LevelController;
    sink: LogSink;
    bindings: LogRecord;
    timestamp: TimestampMode;
    format: "json" | "pretty";
    pretty?: PrettyFormatterOptions;
    pid: number;
    hostname: string;
    contextProvider?: () => LogRecord | void;
    mixin?: () => LogRecord | void;
}
export interface LoggerLifecycle {
    flush(): Promise<void>;
    close(): Promise<void>;
}
export interface LoggerCore extends LoggerLifecycle {
    readonly level: LogLevelName;
    child(bindings: LogRecord): LoggerCore;
    getLevel(): LogLevelName;
    setLevel(level: LogLevelName): void;
    isLevelEnabled(level: LogLevelName): boolean;
    trace(...args: unknown[]): void;
    debug(...args: unknown[]): void;
    info(...args: unknown[]): void;
    warn(...args: unknown[]): void;
    error(...args: unknown[]): void;
    fatal(...args: unknown[]): void;
}