Since TypeScript doesn’t follow SemVer itself, TS libraries which do want to follow SemVer need both high-level guidance about how to do that and detailed analysis of the corner cases to watch out for as well as ways to mitigate breaking changes from TS.

This doc is a (beta!) specification of SemVer for managing changes to TypeScript types, including when the TS compiler makes breaking changes in its type-checking and type emit across a “minor” release.

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