Pete Bacon Darwin d171006083 fix(ivy): ngtsc - NgtscCompilerHost should cope with directories that look like files (#31289)
The TS compiler is likely to test paths with extensions and try to
load them as files. Therefore `fileExists()` and methods that rely
on it need to be able to distinguish between real files and directories
that have paths that look like files.

This came up as a bug in ngcc when trying to process `ngx-virtual-scroller`,
which relies upon a library called `@tweenjs/tween.js`.

PR Close #31289
2019-06-27 12:34:51 -07:00
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