separate front end into modules for easier refactoring later

lib/static/app/utils.js

@@ -0,0 +1,35 @@
+const noJS = () => {
+  return Boolean(document.querySelector("#nojs").checked)
+}
+
+const useStorage = () => Boolean(window.localStorage)
+
+// NOTE: Generate random IDs: https://stackoverflow.com/a/2117523/3056783
+const uuidv4 = () => {
+  return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
+    (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
+  )
+}
+
+const parseStartTimeFromiCalString = (text = '') => {
+  const [ dateStr, timeStr ] = text.split('T')
+  const rawDate = dateStr || ''
+  const rawTime = timeStr || ''
+
+  const year = Number(rawDate.slice(0, 4))
+  const month = Number(Math.max(rawDate.slice(4, 6) - 1), 0)
+  const date = Number(rawDate.slice(6, 8))
+  const hour = Number(rawTime.slice(0, 2))
+  const minutes = Number(rawTime.slice(2, 4))
+  const seconds = Number(rawTime.slice(4, 6))
+
+  const parsedDate = new Date(year, month, date, hour, minutes, seconds)
+  return parsedDate.toString()
+}
+
+export {
+  noJS,
+  uuidv4,
+  parseStartTimeFromiCalString,
+  useStorage,
+}