ignoreFiles one of the restrictions on a theme component?
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Read the docs, because they are good and a lot of work goes into them. Then read them again.
The docs for theme folders and configuration are generally helpful (and much appreciated), but unspecific about the behavior of
ignoreFiles with content in
Generally speaking, let us know:
what you were doing or what you tried,
I tried adding a non-translation, non-TOML file to
i18n/ as part of the Kubernetes CI/CD system for PR review and approval.
what you expected
That when running
hugo server the build process would observe that:
i18n/OWNERSmatches the regex pattern in the
ignoreFilesattribute in the site’s 
i18n/OWNERSand build successfully
The site contains other subfolder OWNERS files (for example,
content/en/OWNERS) and renders without complaint. It is the specific addition of
i18n/OWNERS that causes the build to fail.
what actually happened
Error: Failed to load translations in file "OWNERS": failed to unmarshal OWNERS: unsupported file extension
Include a link to the source code repository of your project, because we really need the context of seeing your templates and partials to be able to help you.
The specific PR: https://github.com/kubernetes/website/pull/10888#issuecomment-436027879
Use the --verbose switch on hugo server to produce more details on the command line including about errors.
$ hugo server --verbose Error: "[...]/website/i18n/OWNERS:1:1": failed to load translations: failed to unmarshal OWNERS: unsupported file extension
Include the output of hugo env from the command line, or any other relevant versions.
$ hugo env Hugo Static Site Generator v0.50/extended darwin/amd64 BuildDate: unknown GOOS="darwin" GOARCH="amd64" GOVERSION="go1.11.1"