appveyor: verify that js/ts files are listed in BUILD.gn

.appveyor.yml

@@ -377,6 +377,17 @@ after_test:
  throw "Build should be up-to-date but isn't."
  }
 
+ # Verify that javascript and typescript files which are bundled by rollup are
+ # listed explicitly in BUILD.gn. This is not an air-tight check.
+ # TODO: make rollup or another bundler write a depfile.
+ - ps: |-
+ $ignore = "test_util.ts", "unit_tests.ts", "*_test.ts"
+ Get-ChildItem "js" -File -Force -Name |
+ where { $name = $_; -not ($ignore | where { $name -like $_ }) } |
+ where { -not (Select-String -Pattern $_ -Path BUILD.gn `
+ -SimpleMatch -CaseSensitive) } |
+ foreach { throw "$_ should be listed in BUILD.gn but isn't." }
+
  # Verify that generated ninja files do not use absolute path names.
  # If they do, it makes ccache/sccache much less effective.
  - ps: |-