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Directly copy only the index signature in addition to declared properties (#56626)

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This commit is contained in:
Ryan Cavanaugh
2023-12-07 12:25:50 -08:00
committed by GitHub
parent fc30163bb4
commit 8456dccbda
6 changed files with 351 additions and 6 deletions
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src/compiler/checker.ts
+5 -6
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@@ -13060,12 +13060,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
const baseTypes = getBaseTypes(source);
if (baseTypes.length) {
if (source.symbol && members === getMembersOfSymbol(source.symbol)) {
const symbolTable = createSymbolTable();
// copy all symbols (except type parameters), including the ones with internal names like `InternalSymbolName.Index`
for (const symbol of members.values()) {
if (!(symbol.flags & SymbolFlags.TypeParameter)) {
symbolTable.set(symbol.escapedName, symbol);
}
const symbolTable = createSymbolTable(source.declaredProperties);
// copy index signature symbol as well (for quickinfo)
const sourceIndex = getIndexSymbol(source.symbol);
if (sourceIndex) {
symbolTable.set(InternalSymbolName.Index, sourceIndex);
}
members = symbolTable;
}