First typescript iteration

server/helpers/custom-validators/misc.ts

@@ -0,0 +1,14 @@
+function exists (value) {
+  return value !== undefined && value !== null
+}
+
+function isArray (value) {
+  return Array.isArray(value)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  exists,
+  isArray
+}