Hey @gongzhxu! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite.

babel-plugin-content-transformer can use api.addExternalDependency (https://dev.to/goatandsheep/how-to-use-babels-new-addexternaldependency-api-338h) to tell Babel that a file relies on some other external file. Babel will then pass this info to whoever is calling Babel (Webpack with babel-loader, @babel/cli, etc), which will be able to re-compile when that external dependency is called.

So this need to be supported both in the plugin and in whatever you are using to run Babel (babel-loader and @babel/cli already support this).

@nicolo-ribaudo thank a lot, the problem has been solved

When I use addExternalDependency watch file in Babel plugin, when I modify this file, sometimes it will trigger the reload of the whole project, but sometimes it is normal