24b2f1da2b
Previously, NgtscProgram lived in the main @angular/compiler-cli package alongside the legacy View Engine compiler. As a result, the main package depended on all of the ngtsc internal packages, and a significant portion of ngtsc logic lived in NgtscProgram. This commit refactors NgtscProgram and moves the main logic of compilation into a new 'core' package. The new package defines a new API which enables implementers of TypeScript compilers (compilers built using the TS API) to support Angular transpilation as well. It involves a new NgCompiler type which takes a ts.Program and performs Angular analysis and transformations, as well as an NgCompilerHost which wraps an input ts.CompilerHost and adds any extra Angular files. Together, these two classes are used to implement a new NgtscProgram which adapts the legacy api.Program interface used by the View Engine compiler onto operations on the new types. The new NgtscProgram implementation is significantly smaller and easier to reason about. The new NgCompilerHost replaces the previous GeneratedShimsHostWrapper which lived in the 'shims' package. A new 'resource' package is added to support the HostResourceLoader which previously lived in the outer compiler package. As a result of the refactoring, the dependencies of the outer @angular/compiler-cli package on ngtsc internal packages are significantly trimmed. This refactoring was driven by the desire to build a plugin interface to the compiler so that tsc_wrapped (another consumer of the TS compiler APIs) can perform Angular transpilation on user request. PR Close #34887
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