Fix compiler crash on property symbols without declarations #45190
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weswigham
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Jul 27, 2021
tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.errors.txt
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Fixes #44970
In short, the checker crash was caused by the fact that properties that go through a mapped type with an
asclause don't have declarations attached to their symbols (#44609), butaddPropertyToElementList, a function used for serializing type nodes, relied on late-bound property symbols having declarations (propertySymbol.declarations).The fix here is to make the part of
addPropertyToElementListthat relies onpropertySymbol.declarationsactually check if declarations is defined before accessing it.In addition, there is now a declaration emit reporter for when we reach a late-bound symbol that has no declarations attached, as that should be an error since we shouldn't serialize that property type for declaration emit purposes.