export declare function atomicWriteFile(filePath: string, contents: string, mode?: number): void;
export declare function upsertEnvVar(filePath: string, key: string, value: string, keysToRemove?: string[]): void;
export declare function removeEnvVar(filePath: string, key: string): boolean;
export declare function readEnvVarFromFile(filePath: string, key: string): string | undefined;
export declare function readEnvFile(filePath: string, options?: {
    stripQuotes?: boolean;
}): Record<string, string>;