/** Compute the deterministic vendor paths mapping (no build needed).
 *  This can be called before vendor files exist on disk. */
export declare const computeVendorPaths: () => Record<string, string>;
/** Build React packages into stable vendor files (no content hash).
 *  Output goes to {buildDir}/react/vendor/ with predictable names like
 *  react.js, react-dom_client.js, etc. These files never change between
 *  rebuilds, so the browser always loads React from a single source. */
export declare const buildReactVendor: (buildDir: string) => Promise<void>;