Prevent merged class/namespace from overlapping with Record<string, unknown>
#47088
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typescript-bot
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Author: Team
For Milestone Bug
andrewbranch
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Jan 6, 2022
src/compiler/checker.ts
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| : !!( | ||
| type.symbol | ||
| && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum | SymbolFlags.ValueModule)) !== 0 | ||
| && !((type.symbol.flags & SymbolFlags.Class) && (type.symbol.flags & SymbolFlags.ValueModule)) |
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Is there a reason not to just use !(type.symbol.flags & SymbolFlags.Class) (dropping the “and is also a value module”)? It looks to me like we believe namespaces generally have an inferable index, and classes don’t, and we want the classiness property to trump the namespacey property in this calculation. It doesn’t seem to need the specificity of “classes merged with namespaces.”
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Probably not; things still work as expected with that simplification. I just took the solution suggested in the issue and thumbs-up'd by Ryan.
andrewbranch
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Jan 7, 2022
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Fixes #43754
If a class is merged with a namespace, we don't want treat values of that type as overlapping with
Record<string, unknown>.Additionally, reformat the expression a little; it was wrapped weirdly and it was not very clear where the parens were (namely, the
typeHasCallOrConstructSignaturescheck appears to be part of the second expression, when it is in fact in the first).