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[API] Narrow types of Node attributes when possible #63877

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[API] Narrow types of Node attributes when possible#63877
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TypeScript 7.1.0 Beta

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@Gerrit0
Gerrit Birkeland (Gerrit0)
opened on Aug 6, 2026

In TS 6, many node attributes were typed with the types which they would always be at runtime. In TS 7 this information has been lost.

  • JSDocTypedefTag#parent should be JSDoc
  • JSDocTypedefTag#typeExpression should probably be TypeNode
  • Node#jsDoc should be readonly JSDoc[]

There are likely others I haven't noticed yet

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