To reproduce the Sprockets issue, run:
`bundle exec rake assets:precompile`
Then note both the logfiles for generating the assets and the contents of the Sprockets manifest:
...
match_path_extname: returning .default.html, {:type=>"text/html", :engines=>[], :pipeline=>"default"}
parse_path_extnames: .default.html, {:type=>"text/html", :engines=>[], :pipeline=>"default"}
in find_asset: /Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default.html
Sprockets::Resolve#resolve: path=/Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default.html, options={}
resolve_absolute_path: /Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default.html
match_path_extname: returning .default.html, {:type=>"text/html", :engines=>[], :pipeline=>"default"}
parse_path_extnames: .default.html, {:type=>"text/html", :engines=>[], :pipeline=>"default"}
got URI: file:///Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default.html?type=text/html
Sprockets::Loader#load: file:///Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default.html?type=text/html
I, [2019-06-10T15:50:15.551166 #39707] INFO -- : Writing /Users/rafal/dev/sprockets-test/public/assets/templates/header-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.html
I, [2019-06-10T15:50:15.551279 #39707] INFO -- : Writing /Users/rafal/dev/sprockets-test/public/assets/templates/header-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.html.gz
NOTE the above generates a .../header-<shadigest>.html, stripping out the
".default" from the original source filename.
Continuing...
match_path_extname: returning .html, {:type=>"text/html", :engines=>[], :pipeline=>nil}
parse_path_extnames: .html, {:type=>"text/html", :engines=>[], :pipeline=>nil}
in find_asset: /Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default_view.html
Sprockets::Resolve#resolve: path=/Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default_view.html, options={}
resolve_absolute_path: /Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default_view.html
match_path_extname: returning .html, {:type=>"text/html", :engines=>[], :pipeline=>nil}
parse_path_extnames: .html, {:type=>"text/html", :engines=>[], :pipeline=>nil}
got URI: file:///Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default_view.html?type=text/html
Sprockets::Loader#load: file:///Users/rafal/dev/sprockets-test/app/assets/javascripts/templates/header.default_view.html?type=text/html
I, [2019-06-10T15:50:15.553671 #39707] INFO -- : Writing /Users/rafal/dev/sprockets-test/public/assets/templates/header.default_view-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.html
I, [2019-06-10T15:50:15.554242 #39707] INFO -- : Writing /Users/rafal/dev/sprockets-test/public/assets/templates/header.default_view-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.html.gz
whereas in this case, where the file name does not match ".default.html", the full base filename is used before the digest is appended.
The resulting compiled assets can be seen in the public/ directory in
the repo.