Export BasePlugin and EventEmitter classes

[treio]

Would it be possible to include BasePlugin and EventEmitter classes in the export?

I am trying to create my custom plugin, and these two classes would be handy.

Adding these into package.json wouldn't be a problem, right?

"exports": {
    ....
    "./dist/base-plugin": {
      "import": "./dist/base-plugin.js",
      "require": "./dist/base-plugin.js"
    },
    "./dist/event-emitter": {
      "import": "./dist/event-emitter.js",
      "require": "./dist/event-emitter.js"
    }
  },

[katspaugh]

Sure, good point! We could export the whole dist I guess.

PR: #2821