export interface LoadEnvFileOptions {
    /** Directory to look in. Defaults to the current working directory. */
    cwd?: string;
    /**
     * The loader itself. Injected by tests; `null` models a runtime older than
     * Node 20.12, where `process.loadEnvFile` does not exist.
     */
    load?: ((path: string) => void) | null;
}
export interface LoadEnvFileResult {
    /** True only when a `.env` was found AND applied to `process.env`. */
    loaded: boolean;
    /** Absolute path of the file that was loaded. */
    path?: string;
    /** Why nothing was loaded, when a `.env` existed but could not be used. */
    reason?: string;
}
/** Load `<cwd>/.env` into `process.env` if it exists. */
export declare function loadEnvFile(opts?: LoadEnvFileOptions): LoadEnvFileResult;