chore: Update health check

lib/health/HealthCheck.ts

@@ -5,13 +5,14 @@ import { HealthReceipt } from "./HealthReceipt"
 import { Trigger } from "./trigger"
 import { TriggerInput } from "./trigger/TriggerInput"
 import { defaultTrigger } from "./trigger/defaultTrigger"
+import { once } from "../util/once"
 
 export function healthCheck(o: {
   effects: Effects
   name: string
   trigger?: Trigger
   fn(): Promise<CheckResult> | CheckResult
-  onFirstSuccess?: () => () => Promise<unknown> | unknown
+  onFirstSuccess?: () => unknown | Promise<unknown>
 }) {
   new Promise(async () => {
     let currentValue: TriggerInput = {
@@ -19,6 +20,13 @@ export function healthCheck(o: {
     }
     const getCurrentValue = () => currentValue
     const trigger = (o.trigger ?? defaultTrigger)(getCurrentValue)
+    const triggerFirstSuccess = once(() =>
+      Promise.resolve(
+        "onFirstSuccess" in o && o.onFirstSuccess
+          ? o.onFirstSuccess()
+          : undefined,
+      ),
+    )
     for (
       let res = await trigger.next();
       !res.done;
@@ -33,6 +41,9 @@ export function healthCheck(o: {
         })
         currentValue.hadSuccess = true
         currentValue.lastResult = "passing"
+        await triggerFirstSuccess().catch((err) => {
+          console.error(err)
+        })
       } catch (_) {
         currentValue.lastResult = "failing"
       }