#12493 specifies globs in file associations, but I'd really like to match based on folder name as well.

For example, Ember uses config/environment.js which in a perfect world the File Icon API would consume into:

<div class="monaco-icon-label file-icon environment.js-name-file-icon js-ext-file-icon ext-file-icon config-dir-file-icon javascript-lang-file-icon file-icon">
<!-- ::before -->
</div>

File icon packs would then just do this: { "config/environment.js": "../icons/ember.svg" }.