next.js

4a3ea6a2 - docs: change API route example file extension to .ts and add JS example with switcher prop (#83044)

docs: change API route example file extension to .ts and add JS example with switcher prop (#83044) ## For Maintainers ### What? Changed the API route example in the documentation to use `.ts` file extension for the TypeScript example since it uses TypeScript types. Added a JavaScript example with `.js` extension using the `switcher` prop to provide both TypeScript and JavaScript variants in the docs. ### Why? The existing example used a `.js` extension but included TypeScript-specific type annotations which is inconsistent and could confuse users. Providing both TypeScript and JavaScript examples improves clarity and usability, catering to a broader audience. ### How? - Updated the filename in the TypeScript example code block to `pages/api/hello.ts`. - Added a parallel JavaScript example code block with `pages/api/hello.js` using the `switcher` property. - Ensured both examples show equivalent handler logic with and without type annotations. --------- Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>