c1960dbe02
Given the following `.babelrc`:
```
{
"plugins": ["./myPluginDir/somePlugin.js"]
}
```
Babel should resolve that plugin relative to the directory that contains the `.babelrc` file.
Currently, Babel is resolving the plugin relative to the current `process.cwd()`, as you can see in this test case: https://github.com/skevy/babel-plugin-resolution-test-case
This is occurring because the "fake" `Module` that we're creating in the `resolve` helper doesn't have an `id` and `filename`. Therefore, Node builds an array of paths that contains a number of node_module paths as well as `.`, and doesn't contain the path in which we'd actually like to look up the plugin. `.` of course resolves to the current `process.cwd()`, and thus makes the Babel plugin resolution mechanism quite fragile. The relevant code in Node.JS can be found here (tagged at the v5.4.1 release): ff99203724/lib/module.js (L236-L242).
This PR adds `id` and `filename` to that fake `Module` in order to resolve this issue.
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