Function JS_NewCClosure 

pub unsafe extern "C" fn JS_NewCClosure(
    ctx: *mut JSContext,
    func: JSCClosure,
    name: *const c_char,
    opaque_finalize: JSCClosureFinalizerFunc,
    length: c_int,
    magic: c_int,
    opaque: *mut c_void,
) -> JSValue