Function JS_NewCFunction2 

pub unsafe extern "C" fn JS_NewCFunction2(
    ctx: *mut JSContext,
    func: Option<unsafe extern "C" fn(*mut JSContext, JSValue, i32, *mut JSValue) -> JSValue>,
    name: *const i8,
    length: i32,
    cproto: u32,
    magic: i32,
) -> JSValue