REPL: have preset/plugin options

[hzoo]

Not sure what the UI for this should be though since it can get pretty crazy. Maybe should support realtime babelrc change/pasting in a babelrc?

[hzoo]

• also preset env options include/exclude preset-env option for the REPL #1497
• kind of covered with npm plugins but adding stuff like transform-runtime Add transform-runtime option to the repl #1502

[alejandroiglesias]

Indeed needed. Some of the plugins cannot be tested without any configuration (like babel-plugin-strip-module).

[Sceat]

or pipelines

[trusktr]

This would help increase productivity in reporting issues.

I was trying to make a simple demo, but default options don't work. example repl

[justinfagnani]

I was just trying to use @babel/plugin-syntax-decorators but it has a required option, so can't work at all in the REPL.

[justinfagnani]

As for UI, I think some kind of textarea in a disclosure for a plugin, that accepts JSON options for that plugin would suffice for most uses.

[robatwilliams]

Came here after reading in this 2018 blog post that adding options to the repl was being worked on..

Due to the removal of default behaviour from proposal plugins, it seems important to have support for options in the repl.