The default read-only implementation of WebPerformanceData.
The default read-only implementation of WebPerformanceData. You typically should not need to directly reference this class; instead, use the WebPerformanceData.apply method to construct new instances.
This Proxy trait allows you to extend the WebPerformanceData trait with additional state or behavior and implement the read-only methods from WebPerformanceData using an underlying instance.
Field information in declaration order.
Checks that all required fields are non-null.
Web performance data as captured from the browser performance timing api. In the descriptions below, "t" represents window.performance.timing