/**
 * Major version of the Capacitor runtime declared in package.json, or null.
 *
 * Checks `@capacitor/core` first (the platform-agnostic runtime), then the
 * platform packages `@capacitor/ios` and `@capacitor/android`, so both the iOS
 * and Android prescan checks resolve the same major from one shared place.
 * Reads dev+prod dependencies, returns null on a missing/malformed package.json
 * (never throws).
 */
export declare function capacitorMajor(projectDir: string): number | null;