export interface DotenvMergeWarning {
    file: string;
    customKeys: string[];
}
export interface DotenvMergeResult {
    content: string;
    customKeys: string[];
}
export declare function mergeDotenvTemplate(params: {
    templateContent: string;
    existingContent?: string;
}): DotenvMergeResult;
export declare function safeRewriteDotenvFile(params: {
    templatePath: string;
    targetPath: string;
    dryRun: boolean;
}): Promise<DotenvMergeWarning | null>;