Conflicts with babel configs

[tunnckoCore]

Hey there. Just realize that when you have Jest and need babel config, so the plugin-build-web output is CJS too.

Some ideas how to handle that? I bet it would be tricky, because in reality we may want and need our config so we can configure browsers and other stuff. So we can't just ignore the babel config existence for the build-web plugin.

Maybe per plugin config, or option like ignoreLocalBabelConfig or such. Which will ignore the existence of it, but will use the default builtin one inside the build-web plugin.

[tunnckoCore]

Hm. Actually, just seen that it has babelrc: false here... Sooo...

That's my pipeline

  "@pika/pack": {
    "pipeline": [
      [
        "@pika/plugin-standard-pkg",
        {
          "exclude": "**/__tests__/**"
        }
      ],
      [
        "@pika/plugin-build-node"
      ],
      [
        "@pika/plugin-build-web"
      ]
    ]
  },

And just have .babelrc.js because I needed for Jest.