/**
 * Log level enum with numeric values for threshold comparison
 */
export declare enum LogLevel {
    TRACE = 10,
    DEBUG = 20,
    INFO = 30,
    WARN = 40,
    ERROR = 50
}
/**
 * Log format types
 */
export declare enum LogFormat {
    PRETTY = "pretty",
    PRETTY_VERBOSE = "pretty-verbose",
    JSON = "json",
    GCP_CLOUD_LOGGING = "gcp-cloud-logging"
}
/**
 * Configuration interface for logger creation
 */
export interface LoggerConfig {
    /** Log level threshold - only logs at this level or higher will be output */
    level: LogLevel;
    /** Log format - pretty for human-readable, json for structured logs */
    format: LogFormat;
    /** Custom logger name/context */
    name?: string;
    /** Additional provider-specific options */
    options?: Record<string, unknown>;
}
/**
 * Universal logger interface that all logger implementations must follow
 */
export interface Logger {
    debug(message: string, meta?: Record<string, unknown>): void;
    info(message: string, meta?: Record<string, unknown>): void;
    warn(message: string, meta?: Record<string, unknown>, exception?: Error | unknown): void;
    error(message: string, meta?: Record<string, unknown>, exception?: Error | unknown): void;
    trace(message: string, meta?: Record<string, unknown>): void;
    log(level: LogLevel, message: string, meta?: Record<string, unknown>, exception?: Error | unknown): void;
}
/**
 * Logger provider interface that creates actual logger instances
 */
export interface LoggerProvider {
    shutdown?(): Promise<void>;
    log(level: LogLevel, message: string, meta?: Record<string, unknown>, exception?: Error | unknown): void;
}
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