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how to solve the script has an unsupported MIME type (‘text/html’)?

I get this: Service Worker URL: /mockServiceWorker.js index.tsx:33
Failed to start mock service worker: DOMException: Failed to update a
ServiceWorker for scope (‘http://localhost:3000/’) with script
(‘http://localhost:3000/mockServiceWorker.js’): The script has an
unsupported MIME type (‘text/html’). (anonymous) @ index.tsx:33
Promise.catch (async) ./src/index.tsx @ index.tsx:31 options.factory @
react refresh:6
webpack_require @ bootstrap:22 (anonymous) @ startup:7 (anonymous) @ startup:7 createGlobalStyle.ts:40 Please do not use @import CSS
syntax in createGlobalStyle at this time, as the CSSOM APIs we use in
production do not handle it well. Instead, we recommend using a
library such as react-helmet to inject a typical meta tag to
the stylesheet, or simply embedding it manually in your index.html