import * as ts from 'typescript/lib/tsserverlibrary';
export interface Logger {
    log(msg: string): void;
    isEnabled(): boolean;
}
/**
 * Logger implementation with performance-aware logging
 *
 * PERFORMANCE OPTIMIZATION:
 * - Logging disabled by default (eliminates string concatenation overhead)
 * - Enable via config: { enableLogging: true }
 * - Saves 10-20% performance in hot paths
 */
export declare class LoggerImpl implements Logger {
    private readonly info;
    private enabled;
    constructor(info: ts.server.PluginCreateInfo, enabled?: boolean);
    log(msg: string): void;
    isEnabled(): boolean;
}
/**
 * No-op logger for maximum performance (zero overhead)
 */
export declare class NoOpLogger implements Logger {
    log(_msg: string): void;
    isEnabled(): boolean;
}
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