use the test file path in the Babel only prop instead of a pattern

[sindresorhus]

since we're only using this once per file now

http://babeljs.io/docs/usage/options/#options

[sindresorhus]

@vdemedes Any thoughts on how to best test to ensure that this is working correctly? Meaning it only transpiles the tested files and nothing more.

[vadimdemedes]

Well, if we are executing babel per file, we should just set file name to only property.
whitelist property is not for files, it is a list of transform to include.

[vadimdemedes]

@sindresorhus Does passing a string to only, instead of a pattern, works?

[sindresorhus]

By whitelist I meant only.

[sindresorhus]

Does passing a string to only, instead of a pattern, works?

It should in theory as the prop is being arrayified, but we need a test for the behavior anyways.

[ahdinosaur]

what about for projects that are using babel to transpile the rest of their app (e.g. by running their code with babel-node), wouldn't this force babel to only transpile the test files?

[sindresorhus]

what about for projects that are using babel to transpile the rest of their app (e.g. by running their code with babel-node), wouldn't this force babel to only transpile the test files?

We already limit that in master. This PR only changes it to only ignore the path explicitly instead of using a ignore pattern. You would just do whatever you with your existing test framework that doesn't support ES2015 builtin, not sure what that is?