Introduce importmap-rails for JavaScript dependency management

[mshibuya]

It will be the default way from Rails 7.
https://world.hey.com/dhh/rails-7-will-have-three-great-answers-to-javascript-in-2021-8d68191b

[mshibuya]

To take advantage of importmap-rails we need to upgrade our dependencies to the ESM-compatible version, which is not the case for many of our current dependencies. Since importmap-rails-based apps can work perfectly with current asset-pipeline-based RailsAdmin, I decided not to do this for now.

But we want to explore a better way to manage our asset dependency. Current practice of vendorizing dependencies is bad and makes dependency upgrade painful. We will be able to consider introducing importmap-rails again when JavaScript dependencies are upgraded in the future.

[brunoprietog]

Hello, is there any news about this? I am using Rails 7 and propshaft instead of sprockets as my asset pipeline and I get an error on installation because sprockets is required.

Thanks!

[mshibuya]

I realized that this is possible now, after upgrading Bootstrap to 5 we now have no ESM-incompatible dependencies.
I'll try to see if it works or not soon.

[jessenovotny]

Is there a corrected rails_admin:install command to work with importmap?