/**
 * A short-lived directory. Automatically removed when the process exits, but
 * can be removed earlier by calling `remove()`.
 */
export interface EphemeralDirectory {
    path: string;
    remove(): void;
}
/**
 * Gets a temporary directory in the project's `.trigger` folder with the
 * specified prefix. We create temporary directories in `.trigger` as opposed
 * to the OS's temporary directory to avoid issues with different drive letters
 * on Windows. For example, when `esbuild` outputs a file to a different drive
 * than the input sources, the generated source maps are incorrect.
 */
export declare function getTmpDir(projectRoot: string | undefined, prefix: string, keep?: boolean): EphemeralDirectory;