export interface DebugLoggerOptions {
    extensionRoot: string;
    debug: boolean;
}
export declare function redactSensitiveString(value: string): string;
export declare function redactForDebugLog(value: unknown): unknown;
export declare class DebugLogger {
    private readonly options;
    private readonly debugDir;
    private readonly logPath;
    private debugDirEnsured;
    private writeQueue;
    constructor(options: DebugLoggerOptions);
    debug(event: string, details?: unknown): void;
    warn(event: string, details?: unknown): void;
    error(event: string, details?: unknown): void;
    flush(): Promise<void>;
    private ensureDebugDir;
    private write;
    private appendLine;
}