type LogLevel = "trace" | "debug" | "info" | "warn" | "error" | "silent";
type PlaceholderValue = string | (() => string);
type Placeholders = Record<string, PlaceholderValue>;
type LogMethod = (...args: unknown[]) => void;
type LoggerConfig = {
    level: LogLevel;
    prefixEnabled: boolean;
    prefixFormat: string;
    placeholders: Placeholders;
};
type LoggerConfigPatch = {
    level?: LogLevel | null;
    prefixEnabled?: boolean | null;
    prefixFormat?: string | null;
    placeholders?: Record<string, PlaceholderValue | null> | null;
};
type LoggerConfigOverrides = Partial<LoggerConfig>;
/** @deprecated Compatibility alias only. Prefer LoggerConfigOverrides for read-side overrides in new code. */
type PerLoggerConfig = LoggerConfigOverrides;
type FormattedLogger = {
    trace: LogMethod;
    debug: LogMethod;
    info: LogMethod;
    warn: LogMethod;
    error: LogMethod;
};
type Logger = {
    readonly name: string;
    format: (template: string) => FormattedLogger;
    trace: LogMethod;
    debug: LogMethod;
    info: LogMethod;
    warn: LogMethod;
    error: LogMethod;
};
/**
 * デフォルト設定関数
 */
declare function setDefaultConfig(patch: LoggerConfigPatch): void;
/**
 * ロガー設定関数
 */
declare function setLoggerConfig(name: string, patch: LoggerConfigPatch): void;
/**
 * ユーティリティ関数
 */
declare function setLogLevel(level: LogLevel): void;
declare function setLoggerLevel(name: string, level: LogLevel): void;
/**
 * ロガー取得関数
 */
declare function getLogger(name: string): Logger;
/**
 * 参照用関数
 */
declare function getDefaultConfig(): Readonly<LoggerConfig>;
declare function getLoggerOverrides(name: string): Readonly<LoggerConfigOverrides>;
declare function getEffectiveLoggerConfig(name: string): Readonly<LoggerConfig>;
declare function getLibraryDefaults(): Readonly<LoggerConfig>;
/**
 * エクスポート
 */
export { getDefaultConfig, getEffectiveLoggerConfig, getLibraryDefaults, getLogger, getLoggerOverrides, setDefaultConfig, setLogLevel, setLoggerConfig, setLoggerLevel, };
export type { FormattedLogger, LogLevel, LoggerConfig, LoggerConfigOverrides, LoggerConfigPatch, Logger, PerLoggerConfig, PlaceholderValue, Placeholders, };