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Malte UblandClaude Opus 5.5
ce87ba722d
`let e = map[k]; if (e === undefined) { e = {}; map[k] = e } e[c] = v` on a `Record<string, Record<string, string>>` compiled, then aborted with "record has no key (typed slot…)" where Node prints the result. Without noUncheckedIndexedAccess a keyed record read keeps its typed trap unless the next statement tests the binding for absence, and only `if (!e)` counted. Comparisons with the missing value now count too (`=== undefined`, `== null`, `!== void 0`, `typeof e === "undefined"` and their mirrored forms) for index-signature record reads whose checker type lacks undefined. Module-scope declarations get the same treatment: their pre-registered global takes the undefined arm before any body reads it, and the initializer lowers as the absence probe. Array reads, annotated bindings and noUncheckedIndexedAccess programs compile as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>