Using codemods 3 -> 4

CanJS
1

I am upgrading my projects to canjs 4 and when I run can-migrate --apply **/*.js --can-version 4 I get what appears to be “help” output:

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When I run can-migrate **/*.* --can-version 4 as shown as an example in the “help” output I receive the following:

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Is there something that I am missing? Should I be running from a particular folder perhaps?

2

Eben,

Can you tell me what version of can-migrate you are using with can-migrate --version ?

3

I installed the new one as per the ‘Migrating to CanJS 4’ guide: npm install -g can-migrate@2

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4

Eben,

Can you make sure the your working directory is clean by checking all your changes and then doing a commit before running the can-migrate command?

5

I am unable to reproduce your issue currently, but it looks like you are using Windows. Switching over to Windows now to see if I can reproduce.

6

Eben,

Please run this with the apply after the file glob like:
can-migrate **/*.js --can-version 4 --apply

Not sure why this makes a difference but I am looking into it.

7

Thanks John,

That did the trick! Quite odd about the commit. Probably worthwhile updating the docs with this information.

However, some of the changes have some unintended consequences. For example:

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The original value in the get method really should not have changed. I’m guessing some serious static analysis would be required to get this 100% correct so I’ll just revert those bits that had more “unintended consequences” than fixes. :slight_smile:

8

Hey @eben_roux, thanks for pointing out the faulty value => default logic. We might be able to fix this (codemods are pretty amazing in what they can parse from code). I filed an issue: https://github.com/canjs/can-migrate/issues/77

9

I double checked and this was fixed already in can-migrate@2.0.0. Sorry for giving you bad information earlier, @chasen.