export interface WriteEnvResult {
    created: boolean;
    replaced: boolean;
    path: string;
}
/**
 * Idempotently sets `key=value` in the env file at `envPath`.
 * Creates the file if missing. Replaces an existing line matching
 * `^\s*KEY\s*=` while preserving comments, whitespace, and other variables.
 */
export declare function writeEnvKey(envPath: string, key: string, value: string): Promise<WriteEnvResult>;
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