Compare enums semi-structurally.
1. Unqualified names must match. 2. Target contains members with same names as all source members.
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@ -5040,6 +5040,11 @@ namespace ts {
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if (source === undefinedType) return Ternary.True;
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if (source === nullType && target !== undefinedType) return Ternary.True;
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if (source.flags & TypeFlags.Enum && target === numberType) return Ternary.True;
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if (source.flags & TypeFlags.Enum && target.flags & TypeFlags.Enum) {
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if (result = enumRelatedTo(source, target)) {
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return result;
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}
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}
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if (source.flags & TypeFlags.StringLiteral && target === stringType) return Ternary.True;
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if (relation === assignableRelation) {
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if (isTypeAny(source)) return Ternary.True;
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@ -5750,6 +5755,25 @@ namespace ts {
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}
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return Ternary.False;
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}
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function enumRelatedTo(source: Type, target: Type) {
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if (source.symbol.name !== target.symbol.name) {
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return Ternary.False;
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}
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const sourceDecl = <EnumDeclaration>getMergedSymbol(source.symbol).valueDeclaration;
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const targetDecl = <EnumDeclaration>getMergedSymbol(target.symbol).valueDeclaration;
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const targetMembers = arrayToMap(targetDecl.members, member => getTextOfPropertyName(<PropertyName>member.name));
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for (const member of sourceDecl.members) {
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const name = getTextOfPropertyName(<PropertyName>member.name);
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if (!targetMembers[name]) {
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reportError(Diagnostics.Property_0_is_missing_in_type_1,
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name,
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typeToString(target, /*enclosingDeclaration*/ undefined, TypeFormatFlags.UseFullyQualifiedType));
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return Ternary.False;
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}
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}
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return Ternary.True;
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}
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}
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// Return true if the given type is part of a deeply nested chain of generic instantiations. We consider this to be the case
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