chore: Adding mainFn helpers

lib/health/trigger/TriggerInput.ts

@@ -0,0 +1,4 @@
+export type TriggerInput = {
+  lastResult: "success" | "failure" | null;
+  hadSuccess: boolean;
+};

lib/health/trigger/changeOnFirstSuccess.ts

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+import { TriggerInput } from "./TriggerInput";
+import { Trigger } from "./index";
+
+export function changeOnFirstSuccess(o: {
+  beforeFirstSuccess: Trigger;
+  afterFirstSuccess: Trigger;
+}) {
+  return async function* () {
+    const beforeFirstSuccess = o.beforeFirstSuccess();
+    let currentValue: TriggerInput = yield;
+    beforeFirstSuccess.next(currentValue);
+    for (
+      let res = await beforeFirstSuccess.next(currentValue);
+      currentValue?.lastResult !== "success" && !res.done;
+      res = await beforeFirstSuccess.next(currentValue)
+    ) {
+      currentValue = yield;
+    }
+    const afterFirstSuccess = o.afterFirstSuccess();
+    for (
+      let res = await afterFirstSuccess.next(currentValue);
+      !res.done;
+      res = await afterFirstSuccess.next(currentValue)
+    ) {
+      currentValue = yield;
+    }
+  };
+}

lib/health/trigger/cooldownTrigger.ts

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+export function cooldownTrigger(timeMs: number) {
+  return async function* () {
+    while (true) {
+      await new Promise((resolve) => setTimeout(resolve, timeMs));
+      yield;
+    }
+  };
+}

lib/health/trigger/defaultTrigger.ts

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+import { cooldownTrigger } from "./cooldownTrigger";
+import { changeOnFirstSuccess } from "./changeOnFirstSuccess";
+
+export const defaultTrigger = changeOnFirstSuccess({
+  beforeFirstSuccess: cooldownTrigger(0),
+  afterFirstSuccess: cooldownTrigger(30000),
+});

lib/health/trigger/index.ts

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+import { TriggerInput } from "./TriggerInput";
+export { changeOnFirstSuccess } from "./changeOnFirstSuccess";
+export { cooldownTrigger } from "./cooldownTrigger";
+
+export type Trigger = () => AsyncIterator<unknown, unknown, TriggerInput>;