fix: return type options for tsup

Author: joshuaellis

tsup.config.base.ts

@@ -3,7 +3,7 @@ import type { Format, Options } from 'tsup'
 export const defaultConfig = (
   config: Omit<Options, 'external' | 'format' | 'minify' | 'dts'>,
   options: Options
-) => ({
+): Options => ({
   ...config,
   clean: !options.watch,
   target: 'esnext',