/** Test-only helpers building fake package trees in temp directories. */
export interface FixturePackage {
    /** Directory relative to the fixture root. */
    dir: string;
    packageJson: Record<string, unknown>;
    /** Write a dist/client/manifest.json stub (marks the module as built). */
    built?: boolean;
    /** Manifest content for the stub; implies `built`. */
    manifest?: Record<string, unknown>;
    /**
     * Skip auto-creating the empty source files for declared
     * `esmx.entry`/`esmx.exports` targets — use to trigger E_TARGET_MISSING.
     */
    noSources?: boolean;
}
export declare function createFixtureRoot(): Promise<string>;
export declare function writeFixturePackage(rootDir: string, pkg: FixturePackage): string;
export declare function removeFixtureRoot(rootDir: string): Promise<void>;