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Bundlers like Rollup may use an element access expression for an export declaration, which causes ngcc to ignore those export declarations possibly resulting in incomplete processing of packages. Element access syntax may be used when the declared name is not considered as valid JS identifier, but bundlers may be conservative in determining whether an identifier can be used (to emit a property access) and opt for a string literal in an element access instead. The element access syntax introduces a problem for ngcc, where it wouldn't consider such export as class declaration, causing them to be skipped. The ngtsc compiler is implemented with the assumption that all class declarations use a `ts.Identifier` as name, whereas the element access is using a string literal for the declared name. This makes it troublesome for ngcc to support this syntax form in UMD bundles. To work around the problem, this function transforms these access expressions into regular property accesses. The source text is parsed to an AST to allow finding the element accesses in a robust way, after which the affected text ranges are replaced with property accesses in the original source text. Closes #44037 PR Close #44669 |
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