/**
 * Strip TypeScript syntax from code, converting it to plain JavaScript.
 *
 * This is a safety net to ensure that even if an LLM generates TypeScript
 * code with type annotations, it will be converted to valid JavaScript
 * before being sent to the sandbox for execution.
 *
 * Uses esbuild's transform API which is extremely fast and handles all
 * TypeScript syntax including:
 * - Type annotations (: string, : number, etc.)
 * - Generic types (Array<T>, Record<K, V>, etc.)
 * - Interface and type declarations
 * - Type assertions
 * - Enums (converted to JavaScript objects)
 *
 * The code is wrapped in an async function before transformation to allow
 * top-level `return` and `await` statements, then unwrapped after.
 *
 * @param code - TypeScript or JavaScript code
 * @returns Plain JavaScript code with all type syntax removed
 * @throws Error if esbuild fails (e.g., syntax error) or wrapper extraction fails
 */
export declare function stripTypeScript(code: string): Promise<string>;