/**
 * Splits a callback expression into its parameter list and body.
 *
 * The split is syntactic rather than textual: locating the body by searching
 * for `=>` finds the first arrow anywhere in the string, including one nested
 * inside the callback's own body, which silently truncates the body and hides
 * whatever it contained.
 */
export declare function strip_arrow_function(expr: string): {
    params: string;
    body: string;
    body_start: number;
    body_end: number;
};
export declare function is_callback_function_expression(expr: string): boolean;
export declare function analyze_event_body_yield_star(body: string): {
    has_top_level_yield_star: boolean;
    has_nested_invalid_yield_star: boolean;
};
export declare function collect_free_identifiers(expr_text: string): string[];