First working version

src/utils.ts

@@ -0,0 +1,12 @@
+export function isNonNullable<T>(any: T): any is NonNullable<T> {
+  return any !== undefined && any !== null
+}
+
+export function sortByProperty<T>(transform: (val: T) => number | string): (a: T, b: T) => number {
+  return (a, b) => {
+    const a2 = transform(a)
+    const b2 = transform(b)
+    if (a2 > b2) return 1
+    return a2 === b2 ? 0 : -1
+  }
+}