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Malte UblandClaude Opus 5.5
07b44cd4b1
`const w = words[i]; w[w.length - 1]` and the narrowed form
`typeof t === "string" ? t[t.length - 1] : ...` were refused with SC1090
("string indexing with this index/result shape"), in `if` statements as well
as in conditional expressions. A binding read from an array keeps an
undefined arm in its storage, and a typeof guard narrows only the checker's
type, so the receiver reached the string-index lowering as the storage
union rather than a string.
The refused path now captures the union and the index and reads the string
arm. A missing value performs the checked-dynamic keyed read on the unit,
which throws Node's "Cannot read properties of undefined (reading '<key>')"
with the evaluated key; a value arm the checker excluded fails the checked
extraction. Receivers that compiled before take the paths they took before.
This is path-to-regexp's tokensToRegexp shape.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>