In-file sourceType configuration

[silverwind]

Currently, the sourceType parser option can only be set in the configuration file for all files in a directory. If one has a mix of both script and module files in the same directory, there's currently no way discern which file is which type.

The prime example of this issue should be ava which expects its tests to be written in module syntax, while other files can be plain scripts.

I think a new inline configuration option could elegantly solve the issue:

// eslint-source-type module

[not-an-aardvark]

I'm not sure this is feasible because source type is a parser option, which needs to be known before the file starts getting parsed and the comments are available.

[platinumazure]

I agree with @not-an-aardvark that this might not be feasible.

Glob-based configuration could potentially solve this, if the tests can be easily denoted via glob expressions. See #3611 for more information.

[silverwind]

Right, this seems something better solved by globs, which could be applied on all parser options, not just sourceType. I'll watch #3611 and workaround through a test directory in the meanwhile. Thanks!