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jakebaileyjakebailey
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Prevent merged class/namespace from overlapping with Record<string, unknown> (microsoft#47088)
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6 files changed

+189
-3
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6 files changed

+189
-3
lines changed

‎src/compiler/checker.ts‎

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@@ -21036,9 +21036,14 @@ namespace ts {
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* with no call or construct signatures.
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*/
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function isObjectTypeWithInferableIndex(type: Type): boolean {
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return type.flags & TypeFlags.Intersection ? every((type as IntersectionType).types, isObjectTypeWithInferableIndex) :
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!!(type.symbol && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum | SymbolFlags.ValueModule)) !== 0 &&
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!typeHasCallOrConstructSignatures(type)) || !!(getObjectFlags(type) & ObjectFlags.ReverseMapped && isObjectTypeWithInferableIndex((type as ReverseMappedType).source));
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return type.flags & TypeFlags.Intersection
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? every((type as IntersectionType).types, isObjectTypeWithInferableIndex)
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: !!(
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type.symbol
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&& (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum | SymbolFlags.ValueModule)) !== 0
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&& !(type.symbol.flags & SymbolFlags.Class)
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&& !typeHasCallOrConstructSignatures(type)
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) || !!(getObjectFlags(type) & ObjectFlags.ReverseMapped && isObjectTypeWithInferableIndex((type as ReverseMappedType).source));
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}
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function createSymbolWithType(source: Symbol, type: Type | undefined) {

‎tests/baselines/reference/mergedClassNamespaceRecordCast.errors.txt‎

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tests/cases/compiler/mergedClassNamespaceRecordCast.ts(3,1): error TS2352: Conversion of type 'C1' to type 'Record<string, unknown>' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
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Index signature for type 'string' is missing in type 'C1'.
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tests/cases/compiler/mergedClassNamespaceRecordCast.ts(9,1): error TS2352: Conversion of type 'C2' to type 'Record<string, unknown>' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
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Index signature for type 'string' is missing in type 'C2'.
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tests/cases/compiler/mergedClassNamespaceRecordCast.ts(12,10): error TS2339: Property 'unrelated' does not exist on type 'C2'.
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==== tests/cases/compiler/mergedClassNamespaceRecordCast.ts (3 errors) ====
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class C1 { foo() {} }
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new C1() as Record<string, unknown>;
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!!! error TS2352: Conversion of type 'C1' to type 'Record<string, unknown>' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
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!!! error TS2352: Index signature for type 'string' is missing in type 'C1'.
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class C2 { foo() {} }
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namespace C2 { export const unrelated = 3; }
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new C2() as Record<string, unknown>;
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!!! error TS2352: Conversion of type 'C2' to type 'Record<string, unknown>' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
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!!! error TS2352: Index signature for type 'string' is missing in type 'C2'.
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C2.unrelated
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new C2().unrelated
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~~~~~~~~~
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!!! error TS2339: Property 'unrelated' does not exist on type 'C2'.
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namespace C3 { export const unrelated = 3; }
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C3 as Record<string, unknown>;
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‎tests/baselines/reference/mergedClassNamespaceRecordCast.js‎

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//// [mergedClassNamespaceRecordCast.ts]
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class C1 { foo() {} }
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new C1() as Record<string, unknown>;
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class C2 { foo() {} }
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namespace C2 { export const unrelated = 3; }
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new C2() as Record<string, unknown>;
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C2.unrelated
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new C2().unrelated
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namespace C3 { export const unrelated = 3; }
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C3 as Record<string, unknown>;
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//// [mergedClassNamespaceRecordCast.js]
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var C1 = /** @class */ (function () {
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function C1() {
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}
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C1.prototype.foo = function () { };
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return C1;
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}());
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new C1();
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var C2 = /** @class */ (function () {
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function C2() {
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}
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C2.prototype.foo = function () { };
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return C2;
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}());
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(function (C2) {
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C2.unrelated = 3;
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})(C2 || (C2 = {}));
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new C2();
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C2.unrelated;
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new C2().unrelated;
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var C3;
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(function (C3) {
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C3.unrelated = 3;
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})(C3 || (C3 = {}));
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C3;

‎tests/baselines/reference/mergedClassNamespaceRecordCast.symbols‎

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=== tests/cases/compiler/mergedClassNamespaceRecordCast.ts ===
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class C1 { foo() {} }
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>C1 : Symbol(C1, Decl(mergedClassNamespaceRecordCast.ts, 0, 0))
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>foo : Symbol(C1.foo, Decl(mergedClassNamespaceRecordCast.ts, 0, 10))
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new C1() as Record<string, unknown>;
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>C1 : Symbol(C1, Decl(mergedClassNamespaceRecordCast.ts, 0, 0))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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class C2 { foo() {} }
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>C2 : Symbol(C2, Decl(mergedClassNamespaceRecordCast.ts, 2, 36), Decl(mergedClassNamespaceRecordCast.ts, 5, 21))
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>foo : Symbol(C2.foo, Decl(mergedClassNamespaceRecordCast.ts, 5, 10))
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namespace C2 { export const unrelated = 3; }
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>C2 : Symbol(C2, Decl(mergedClassNamespaceRecordCast.ts, 2, 36), Decl(mergedClassNamespaceRecordCast.ts, 5, 21))
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>unrelated : Symbol(unrelated, Decl(mergedClassNamespaceRecordCast.ts, 6, 27))
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new C2() as Record<string, unknown>;
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>C2 : Symbol(C2, Decl(mergedClassNamespaceRecordCast.ts, 2, 36), Decl(mergedClassNamespaceRecordCast.ts, 5, 21))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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C2.unrelated
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>C2.unrelated : Symbol(C2.unrelated, Decl(mergedClassNamespaceRecordCast.ts, 6, 27))
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>C2 : Symbol(C2, Decl(mergedClassNamespaceRecordCast.ts, 2, 36), Decl(mergedClassNamespaceRecordCast.ts, 5, 21))
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>unrelated : Symbol(C2.unrelated, Decl(mergedClassNamespaceRecordCast.ts, 6, 27))
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new C2().unrelated
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>C2 : Symbol(C2, Decl(mergedClassNamespaceRecordCast.ts, 2, 36), Decl(mergedClassNamespaceRecordCast.ts, 5, 21))
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namespace C3 { export const unrelated = 3; }
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>C3 : Symbol(C3, Decl(mergedClassNamespaceRecordCast.ts, 11, 18))
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>unrelated : Symbol(unrelated, Decl(mergedClassNamespaceRecordCast.ts, 14, 27))
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C3 as Record<string, unknown>;
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>C3 : Symbol(C3, Decl(mergedClassNamespaceRecordCast.ts, 11, 18))
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>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
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‎tests/baselines/reference/mergedClassNamespaceRecordCast.types‎

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=== tests/cases/compiler/mergedClassNamespaceRecordCast.ts ===
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class C1 { foo() {} }
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>C1 : C1
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>foo : () => void
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new C1() as Record<string, unknown>;
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>new C1() as Record<string, unknown> : Record<string, unknown>
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>new C1() : C1
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>C1 : typeof C1
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class C2 { foo() {} }
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>C2 : C2
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>foo : () => void
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namespace C2 { export const unrelated = 3; }
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>C2 : typeof C2
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>unrelated : 3
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>3 : 3
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new C2() as Record<string, unknown>;
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>new C2() as Record<string, unknown> : Record<string, unknown>
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>new C2() : C2
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>C2 : typeof C2
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C2.unrelated
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>C2.unrelated : 3
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>C2 : typeof C2
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>unrelated : 3
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new C2().unrelated
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>new C2().unrelated : any
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>new C2() : C2
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>C2 : typeof C2
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>unrelated : any
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namespace C3 { export const unrelated = 3; }
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>C3 : typeof C3
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>unrelated : 3
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>3 : 3
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C3 as Record<string, unknown>;
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>C3 as Record<string, unknown> : Record<string, unknown>
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>C3 : typeof C3
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‎tests/cases/compiler/mergedClassNamespaceRecordCast.ts‎

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class C1 { foo() {} }
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new C1() as Record<string, unknown>;
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class C2 { foo() {} }
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namespace C2 { export const unrelated = 3; }
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new C2() as Record<string, unknown>;
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C2.unrelated
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new C2().unrelated
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namespace C3 { export const unrelated = 3; }
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C3 as Record<string, unknown>;

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