types: TS conformance Rounds 6-11 — 216→250 Pass (symbol members, operators, class/interface checks)#1262

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Commits on Jul 6, 2026

fix(types): stop var/const arrow hoisting placeholder from tripping TS2403
nickna
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test(conformance): update baseline — subtypingWithCallSignatures2/3/4 now pass
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fix(types): fix swapped-branch bug in ternary common-type selection
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fix(types): relate namespace/module types structurally in IsCompatibleCore
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test(conformance): update baseline — 3 more tests now pass
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fix(types): add TS2464 computed-property-name validation, type Symbol/SymbolConstructor precisely
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test(conformance): update baseline — symbolProperty3/52/54 now pass
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fix(types): detect duplicate well-known-symbol object-literal keys and class accessors
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test(conformance): update baseline — symbolProperty36/44 now pass
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fix(types): validate overloads for computed well-known-symbol class methods
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test(conformance): update baseline — symbolProperty39/42/43 now pass
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fix(types): flag a class accessor that collides with a same-named method
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test(conformance): update baseline — symbolDeclarationEmit12 now passes
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fix(types): fix swapped-branch bug in nullish-coalescing common-type selection
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fix(types): validate well-known-symbol interface members against a symbol index signature
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test(conformance): update baseline — symbolProperty17 now passes
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Commits on Jul 9, 2026