Function toGuardEvent

toGuardEvent(event: FirewallEvent, at: number): GuardEvent
Turn a runtime firewall event into a guard event. The runtime's event carries the applet's message; the guard event never does, so nothing the applet sent reaches the guard log. Reasons follow the guard's vocabulary: a rate is rate:<class>, the startup burst is flood:startup, anything else is runtime:<ruleId>.
Parameters
- event: FirewallEvent
  What the runtime firewall reported.
- at: number
  When it happened.
Returns GuardEvent
The guard event.
Example
```
toGuardEvent({ windowId: 'w1', napplet: 'chat', opClass: 'state:write', decision: 'reject', action: 'block', ruleId: 'rate:opclass', reason: '…' }, 0).reason;
// 'rate:storage:write'
```