[Feature] Run babel on specific file

[mohit217]

💻

• Would you like to work on this feature?

What problem are you trying to solve?

I am trying to run Babel on a specific file using babel.config.js but couldn't find out a way to do it. I saw a way to do it https://babeljs.io/docs/options#test using this option but it doesn't use the option and runs on everything.

I found a work around for this here, #5420 (comment) but I want to use just babel instead of webpack.

Describe the solution you'd like

Use test at top level for plugin options.

Describe alternatives you've considered

#5420 (comment)

Documentation, Adoption, Migration Strategy

No response

[babel-bot]

Hey @mohit217! 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.

[liuxingbaoyu]

https://babeljs.io/docs/options#only

Are you looking for it?

[mohit217]

@liuxingbaoyu I want to run a specific plugin only for a specific file. I tried with only as an option for plugin but it didn't work

[JLHwung]

I want to run a specific plugin only for a specific file.

Let specific file denoted by foo.js, if you really want to isolate foo.js's config from other sources, you can create a new Babel config file (foo.babel.config.json) just for that foo.js. And then add a new pass to your build commands:

npx babel --config-file foo.babel.config.json --out-dir ./foo-output.js ./foo.js

In your main Babel config, you should ignore ./foo.js:

{
  "ignore": "./foo.js"
}