Into the Unknown
summary
A TypeScript library for freeze and thaw gets built and it actually works: freezing adds a { frozen: true } intersection type and thaw removes it, restoring the original type. The talk shows replacing any with unknown over any, using assertion guard functions that throw (returning never) to narrow types, generics + extends to constrain inputs, and conditional types with infer to extract the original T so thaw returns the unwrapped object.
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chapters (4)
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