/**
 * Resolves the `.trigger/tmp` root for a dev session, scoped to the branch so
 * concurrent sessions on different branches don't share (and clobber) a build
 * tree. The default branch keeps the original `.trigger/tmp` path; branches get
 * a sibling root (e.g. `.trigger/tmp-feature-foo`) so a default-branch
 * `clearTmpDirs` can't reach into a branch's tree, and vice versa.
 */
export declare function getTmpRoot(projectRoot: string | undefined, branch?: string): string;
/**
 * 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, branch?: string): EphemeralDirectory;
export declare function clearTmpDirs(projectRoot: string | undefined, branch?: string): void;
/**
 * Gets the shared store directory for content-addressable build outputs.
 * This directory persists across rebuilds and is used to deduplicate
 * identical chunk files between build versions.
 * Automatically cleaned up when the process exits.
 */
export declare function getStoreDir(projectRoot: string | undefined, keep?: boolean, branch?: string): string;