c8c8648abf
When ngtsc compiles @angular/core, it rewrites core imports to the r3_symbols.ts file that exposes all internal symbols under their external name. When creating the FESM bundle, the r3_symbols.ts file causes the external symbol names to be rewritten to their internal name. Under ngcc compilations of FESM bundles, the indirection of r3_symbols.ts is no longer in place such that the external names are retained in the bundle. Previously, the external name `ɵdefineNgModule` was explicitly declared internally to resolve this issue, but the recently added `setClassMetadata` was not declared as such, causing runtime errors. Instead of relying on the r3_symbols.ts file to perform the rewrite of the external modules to their internal variants, the translation is moved into the `ImportManager` during the compilation itself. This avoids the need for providing the external name manually. PR Close #27055
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