feat: Convert helpers to use JS files

packages/backend/src/helpers/delay-as-milliseconds.js

@@ -0,0 +1,19 @@
+import delayForAsMilliseconds from './delay-for-as-milliseconds';
+import delayUntilAsMilliseconds from './delay-until-as-milliseconds';
+
+const delayAsMilliseconds = (eventKey, computedParameters) => {
+  let delayDuration = 0;
+
+  if (eventKey === 'delayFor') {
+    const { delayForUnit, delayForValue } = computedParameters;
+
+    delayDuration = delayForAsMilliseconds(delayForUnit, Number(delayForValue));
+  } else if (eventKey === 'delayUntil') {
+    const { delayUntil } = computedParameters;
+    delayDuration = delayUntilAsMilliseconds(delayUntil);
+  }
+
+  return delayDuration;
+};
+
+export default delayAsMilliseconds;