Improve union origin preservation in filtering-unionizing binary expressions #61362
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Andarist
commented
Mar 6, 2025
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| function getUnionOfLeftAndRightTypes(leftType: Type, rightType: Type, adjustLeft: (type: Type) => Type, unionReduction?: UnionReduction) { | ||
| const rightTypes = rightType.flags & TypeFlags.Union ? (rightType as UnionType).types : [rightType]; | ||
| const includes = addTypesToUnion(/*typeSet*/ undefined, 0 as TypeFlags, rightTypes) & (TypeFlags.BaseOfLiteral | TypeFlags.Nullable); |
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It's not like all 3 cases require both BaseOfLiteral and Nullable preservation but there is no harm in treating them the same way here
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fixes #43031