Files
scriptc/tests/corpus
Malte UblandClaude Opus 5.5 b200bde558 Read a generic constraint member the instantiation omits
`options.sessionId` inside a generic function whose type parameter's
constraint declares `sessionId?: string` fenced with SC1090 when the call
site's options record has no such slot:

  function applyAuth<TModel, TOptions extends ProviderRequestOptions<TModel> & Transforms>(
    model: TModel, options: TOptions | undefined) {
    const sessionId =
      options && "sessionId" in options && typeof options.sessionId === "string"
        ? options.sessionId : undefined;
  }
  applyAuth(model, { apiKey, azureApiVersion });

The checker admits the read through the constraint (and, with the `in`
guard, through a synthetic `T & Record<"sessionId", unknown>`), while the
instantiated record — the value's actual layout — stores no such field.
`fieldTarget` found no record slot and the read fell through to the
generic unsupported-property fence, even though Node simply reads the
property off the object it has: undefined when the caller omitted it, the
extra property when a JavaScript caller supplied one.

fieldTarget now recognizes a generic receiver (a type parameter, or an
`in`-narrowed intersection that contains one) whose stored record lacks
the member, and lowers the read as the checked-dynamic keyed read of that
record value, entering the static code at the type the checker gave the
read. Reads that keep a slot take their record get as before, and the
programs this path opens did not compile at all before, so typed code
keeps its representation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-29 05:38:14 -07:00
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