/**
 * Instruments code for concolic execution using yuku-parser and yuku-codegen.
 * It injects tracing hooks around conditional branches and function calls.
 *
 * For SFC files (.vue, .svelte, .astro) only the <script> block is instrumented;
 * the surrounding template/markup is left untouched.
 */
export declare function instrumentCode(code: string, filename: string): string | null;