6e994272e8
Prior to this fix, incremental rebuilds could fail to type check due to missing ambient types from auto-discovered declaration files in @types directories, or type roots in general. This was caused by the intermediary `ts.Program` that is created for template type checking, for which a `ts.CompilerHost` was used which did not implement the optional `directoryExists` methods. As a result, auto-discovery of types would not be working correctly, and this would retain into the `ts.Program` that would be created for an incremental rebuild. This commit fixes the issue by forcing the custom `ts.CompilerHost` used for type checking to properly delegate into the original `ts.CompilerHost`, even for optional methods. This is accomplished using a base class `DelegatingCompilerHost` which is typed in such a way that newly introduced `ts.CompilerHost` methods must be accounted for. Fixes #38979 PR Close #39011
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