add maybe array

index.ts

@@ -9,3 +9,4 @@ export * from './src/i18n';
 export * from './src/patch-string-in-object';
 export * from './src/observe-diff';
 export * from './src/memorize';
+export * from './src/may-be-array';

src/may-be-array.ts

+export type MayBeArray<T> = T | T[];
+
+export const makeArray = <T>(value: MayBeArray<T>): T[] => {
+  return Array.isArray(value) ? value : [value];
+};