feat(types): allow autocomplete for target (#809)

Author: ImLunaHey

src/options.ts

@@ -44,6 +44,34 @@ export type BannerOrFooter =
     }
   | ((ctx: { format: Format }) => { js?: string; css?: string } | undefined)
 
+type Autocomplete<Keys extends string> = Keys | Omit<string, Keys>
+export type BrowserTarget =
+  | 'chrome'
+  | 'deno'
+  | 'edge'
+  | 'firefox'
+  | 'hermes'
+  | 'ie'
+  | 'ios'
+  | 'node'
+  | 'opera'
+  | 'rhino'
+  | 'safari'
+export type EsTarget =
+  | 'es3'
+  | 'es5'
+  | 'es6'
+  | 'es2015'
+  | 'es2016'
+  | 'es2017'
+  | 'es2018'
+  | 'es2019'
+  | 'es2020'
+  | 'es2021'
+  | 'es2022'
+  | 'esnext'
+export type Target = Autocomplete<BrowserTarget | EsTarget>
+
 /**
  * The options available in tsup.config.ts
  * Not all of them are available from CLI flags
@@ -65,7 +93,7 @@ export type Options = {
    *
    * default to `node14`
    */
-  target?: string | string[]
+  target?: Target | Target[]
   minify?: boolean | 'terser'
   terserOptions?: MinifyOptions
   minifyWhitespace?: boolean