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src/compiler/checker.ts
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| // Unions and intersections of the above | ||
| if (symbol.flags & SymbolFlags.SyntheticProperty) { | ||
| return forEach(symbol.declarations, decl => isReadonlySymbol(getSymbolOfNode(decl))); | ||
| } |
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This could probably be more efficient. When a symbol has multiple declarations (such as an overloaded method) we'll end up doing the same check multiple times even though the outcome is always false. Ideally we'd have a SymbolFlags.Readonly that we compute in the same way as SymbolFlags.Optional, but we're out of flag bits. Perhaps it would be better to compute the readonly state in createUnionOrIntersectionProperty (by calling isReadonlySymbol for each underlying symbol) and then record the result in an isReadonly property on the symbol itself.
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That sounds like a good idea. Done.
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@ahejlsberg can you take a look at the updated code? |
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sandersn
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make-unions-and-intersections-of-readonly-properties-readonly
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Fixes #9108
@ahejlsberg can you take a look to confirm that this is how readonly should work with unions and intersections of properties?