Function JS_NewCClosure 

pub unsafe extern "C" fn JS_NewCClosure(
    ctx: *mut JSContext,
    func: Option<unsafe extern "C" fn(*mut JSContext, JSValue, i32, *mut JSValue, i32, *mut c_void) -> JSValue>,
    name: *const i8,
    opaque_finalize: Option<unsafe extern "C" fn(*mut c_void)>,
    length: i32,
    magic: i32,
    opaque: *mut c_void,
) -> JSValue