This was originally disallowed because #5907 was opened asking for different behavior in this situation that we didn't want to allow, and so we decided to make it a compiler error rather than have confusing behavior in that situation.

I just spent a day dismantling a model, trying to find the cause of the silent rollback - taking out every association, every validation, every callback, whittling down all the code in the transaction, only to finally discover that it was return true that was the cause of it all. Or yes, an exception!

If you forget to define x in the object you pass as the second argument, or if there's some similar bug or confusion, you won't get an error -- just unexpected results.

I would argue though that crashing is better than quietly providing unexpected behavior.

You can determine which openssl.cnf is being used by adding a spurious XXX to the file and see if openssl chokes.

`Module ${a.id} may be unable to evaluate without ${b.id}, but is included first due to a cyclical dependency. Consider swapping the import statements in ${parent} to ensure correct ordering`

Since this issue seems to pop up periodically, it would be useful to turn this into a warning. It may not be elegant, but it prevents surprise blank screens due to a navigation error.

The node-resolve plugin doesn't like failing to resolve module IDs (because it usually indicates a bug, like you forgot to install the package in question), so it will throw an error rather than letting Rollup print a warning.

using modulesOnly behaves exactly as expected when it warns you that the listed npm libraries do not use the ES6 format and are in fact ignored. This option is meant as a way to determine if you still have commonjs libraries in your dependencies that require special treatment via rollup-plugin-commonjs. Your code will probably not work since the listed dependencies will be missing. You should remove modulesOnly and instead add rollup-plugin-commonjs.

You oftentimes see packages list react as a peer dependency. Since this prevents react from being installed into that package's node_modules, this is another way of preventing Rollup from bundling the module. This is also nice _if_ you want the application to install react from npm, because if an application forgets to install a peer dependency, npm will issue a warning.

When the message say function was called outside component initialization first will look at my code and last at my configuration.

i feel it should get a runtime warning / error, if it returns something besides function or undefined.