Initial commit

api/src/utils/array-wrap.ts

@@ -0,0 +1,11 @@
+type AsArray<T> = T extends [] ? T : T[]
+
+/**
+ * Wraps its argument in an array unless it is already an array (or array-like).
+ * See https://api.rubyonrails.org/classes/Array.html#method-c-wrap
+ */
+export function arrayWrap<T>(value: T | T[]): AsArray<T> {
+  return Array.isArray(value) ? (value as AsArray<T>) : ([value] as AsArray<T>)
+}
+
+export default arrayWrap