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Malte UblandClaude Opus 5.5
22cbd7623b
A TypeScript subclass of Error that declared `cause` was refused with SC1090, although the same field in a JavaScript class already compiled. The declaration now lowers like the JavaScript field: it defines the error's own enumerable `cause` after super() returns, undefined without an initializer, replacing a cause passed through the options exactly as Node does. `declare` and `abstract` declarations are erased and define nothing. Reads of `.cause` on Error-rooted classes are always the checked-dynamic property, so only declarations typed `unknown` or `object` are accepted. Other declared types, parameter properties and accessors named `cause` keep named refusals. This unblocks the source of @openfeature/core, whose abstract error base declares `cause?: unknown`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>