Virtual modules as transitive dependency break build

[buschtoens]

If an addon (direct-addon) has a dependency onto another addon (intermediary-addon) that depends on a third addon (transitive-addon) that provides virtual modules, the build breaks.

• host-app
  • app with a direct dependency on direct-addon
• direct-addon
  • addon with a direct dependency on intermediary-addon
  • composes local-classes from intermediary-addon physical .css files
• intermediary-addon
  • addon with a direct dependency on transitive-addon
  • imports @values or composes local-classes from transitive-addon's virtual modules
• transitive-addon
  • an addon without any physical .css files
  • provides virtual modules

Running ember s inside intermediary-addon works.
But running ember s inside direct-addon or host-app does not.

The actual error thrown is:

Error: Unable to resolve styles module 'transitive-addon/virtual-module' imported from '/Users/jan/demo/direct-addon/addon/components/some-component/styles.css'. No virtual module with that name was defined and no corresponding addon was found.
    at resolveExternalPath (/Users/jan/demo/node_modules/ember-css-modules/lib/resolve-path.js:55:11)
    at ModulesPreprocessor.resolvePath [as _resolvePath] (/Users/jan/demo/node_modules/ember-css-modules/lib/resolve-path.js:14:12)
    at ModulesPreprocessor.resolvePath (/Users/jan/demo/node_modules/ember-css-modules/lib/modules-preprocessor.js:185:17)
    at ModulesPreprocessor.resolveAndRecordPath (/Users/jan/demo/node_modules/ember-css-modules/lib/modules-preprocessor.js:156:25)
    at CSSModules.fetchExports (/Users/jan/demo/node_modules/broccoli-css-modules/index.js:138:29)
    at fetchImport (/Users/jan/demo/node_modules/broccoli-css-modules/lib/link-modules.js:40:34)
    at /Users/jan/demo/node_modules/broccoli-css-modules/lib/link-modules.js:31:20
    at Root.each (/Users/jan/demo/node_modules/postcss/lib/container.js:105:16)
    at fetchAllImports (/Users/jan/demo/node_modules/broccoli-css-modules/lib/link-modules.js:29:7)
    at /Users/jan/demo/node_modules/broccoli-css-modules/lib/link-modules.js:19:24

But it gets swallowed as:

Error: Unable to locate module "direct-addon/components/some-component/styles" imported from /var/folders/zd/7ly06mpn2t512t2fr1g1ppw80000gq/T/broccoli-88502T1X0zlnjt79z/out-3664-module_source_funnel/direct-addon/components/other-component/styles.css
    at ModulesPreprocessor.onModuleResolutionFailure (/Users/jan/demo/node_modules/ember-css-modules/lib/modules-preprocessor.js:133:11)
    at /Users/jan/demo/node_modules/broccoli-css-modules/lib/link-modules.js:54:13
    at tryCatcher (/Users/jan/demo/node_modules/rsvp/dist/lib/rsvp/-internal.js:39:19)
    at invokeCallback (/Users/jan/demo/node_modules/rsvp/dist/lib/rsvp/-internal.js:211:31)
    at publish (/Users/jan/demo/node_modules/rsvp/dist/lib/rsvp/-internal.js:197:7)
    at publishRejection (/Users/jan/demo/node_modules/rsvp/dist/lib/rsvp/-internal.js:132:3)
    at flush (/Users/jan/demo/node_modules/rsvp/dist/lib/rsvp/asap.js:80:5)
    at processTicksAndRejections (internal/process/task_queues.js:75:11)

When I add transitive-addon as a direct dependency to direct-addon as well, it works.