Common AST formats such as TS and Babel do not use a separate node for comments, but instead attach comments to other AST nodes. Previously this was worked around in TS by creating a `NotEmittedStatement` AST node to attach the comment to. But Babel does not have this facility, so it will not be a viable approach for the linker. This commit refactors the output AST, to remove the `CommentStmt` and `JSDocCommentStmt` nodes. Instead statements have a collection of `leadingComments` that are rendered/attached to the final AST nodes when being translated or printed. PR Close #38811
Angular Compatibility Compiler (ngcc)
This compiler will convert node_modules compiled with ngc, into node_modules which
appear to have been compiled with ngtsc.
This conversion will allow such "legacy" packages to be used by the Ivy rendering engine.
Building
The project is built using Bazel:
yarn bazel build //packages/compiler-cli/ngcc
Unit Testing
The unit tests are built and run using Bazel:
yarn bazel test //packages/compiler-cli/ngcc/test
Integration Testing
There are tests that check the behavior of the overall executable:
yarn bazel test //packages/compiler-cli/ngcc/test:integration