Properly discriminate by pattern literal types in isTypeInvalidDueToUnionDiscriminant
#61350
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…UnionDiscriminant`
typescript-bot
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For Uncommitted Bug
Andarist
commented
Mar 4, 2025
| const name = nameType && isTypeUsableAsPropertyName(nameType) ? getPropertyNameFromType(nameType) : undefined; | ||
| const expected = name === undefined ? undefined : getTypeOfPropertyOfType(contextualType, name); | ||
| return !!expected && isLiteralType(expected) && !isTypeAssignableTo(getTypeOfNode(property), expected); | ||
| return !!expected && (isLiteralType(expected) || isPatternLiteralType(expected)) && !isTypeAssignableTo(getTypeOfNode(property), expected); |
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This matches the logic in createUnionOrIntersectionProperty here. This HasLiteralType is required for Discriminant:
TypeScript/src/compiler/types.ts
Line 6074 in c85e626
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fixes #61347