an spa page's directory holds a file that is not a .ts/.tsx source, or one outside the directory
page/spa-unsupported-file
Generated from the language definition for ruleset 1.7.
Severity: error
Since: 1.0
Summary: an spa page's directory holds a file that is not a .ts/.tsx source, or one outside the directory
Fix: remove it; styles use the host's classes and assets are referenced by URL
See also: /book/single-page-app-pages