ESLint for Meteor 3 readiness

[filipenevola]

We could create an eslint plugin for Meteor 3 readiness.

For example, today, in Meteor 2.13, you can create an async Method or a sync Method, but the latter is not going to work with Meteor 3 if you have any async call inside it, and you will probably have as Mongo calls are going to be all async.

The benefit of eslint plugins is that we can later add rules and turn them on and off for each project, file, or line.

So we don't need to migrate everything at once.

Pre Tasks

• [x] Integrate walker from zodern with ESLint
• [x] Improve walker to consider mainModule as well
• [x] Make sure we take into account Meteor.isServer and Meteor.isClient

Tasks

• [x] Check all old methods no longer available with ESLint rules and add these rules in Meteor eslint - List of changes
• [x] Detect direct use of Fiber, Future
• [x] Detect direct use of Promise.await or promise.await

Optional tasks

• [ ] Run in local packages as well?
• [ ] Make eslint to work with packages
• Other use-cases not covered
  • [ ] callback-hook: forEach
  • [ ] Cursor: [Symbol.asyncIterator]
  • [ ] ddp-server: call and apply

[filipenevola]

We've created a new plugin

It's still a working in progress but with it I was able to find 8 places in CodeFTW.dev that were missing migration 😮

[filipenevola]

The plug-in is working fine for awhile. Optional tasks won't be implemented for now.