If I have install @babel/runtime-corejs3 do I still need to install core-js@3 in my package.json?

[nyngwang]

I've described my problem on StackOverflow, here: https://stackoverflow.com/q/68878931/5290519.

Basically I want to know that If I ihave nstall @babel/runtime-corejs3 do I still need to install core-js@3 in my package.json?

[JLHwung]

You don't need to install core-js@3 if you are using @babel/transform-runtime, unless you import it somewhere in your app sources. If you are setting up a new project, I would recommend you to try out https://github.com/babel/babel-polyfills#babel-polyfills, it works well with preset-env, see https://github.com/babel/babel-polyfills/blob/main/docs/migration.md for migration.