Angular Library Maintainer Explains Why npm Package Testing Beats Source Code Checks

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A developer maintaining an open-source Angular library discovered that validating compatibility against local workspace files and dist/ folders does not reflect what users actually install from npm. This insight prompted a redesign of the CI pipeline to test the published package artifact across multiple Angular versions, from version 17 through 22. The author highlights that testing dist/ alone is insufficient due to Angular's partial compilation and linker behavior, and that type-checking can miss real compatibility issues. The recommended approach involves using npm pack to validate the packaged artifact before release. The developer shared these findings in a detailed article and is inviting other library maintainers to discuss their own compatibility testing strategies.

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