Function getDeclaredTypeOfTypeAlias

test/fixtures/snapshot/typescript.js:57383–57418

(symbol)

            return links.declaredType;
        }
        function getDeclaredTypeOfTypeAlias(symbol) {
            var _a;
            var links = getSymbolLinks(symbol);
            if (!links.declaredType) {
                // Note that we use the links object as the target here because the symbol object is used as the unique
                // identity for resolution of the 'type' property in SymbolLinks.
                if (!pushTypeResolution(symbol, 2 /* TypeSystemPropertyName.DeclaredType */)) {
                    return errorType;
                }
                var declaration = ts.Debug.checkDefined((_a = symbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isTypeAlias), "Type alias symbol with no valid declaration found");
                var typeNode = ts.isJSDocTypeAlias(declaration) ? declaration.typeExpression : declaration.type;
                // If typeNode is missing, we will error in checkJSDocTypedefTag.
                var type = typeNode ? getTypeFromTypeNode(typeNode) : errorType;
                if (popTypeResolution()) {
                    var typeParameters = getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol);
                    if (typeParameters) {
                        // Initialize the instantiation cache for generic type aliases. The declared type corresponds to
                        // an instantiation of the type alias with the type parameters supplied as type arguments.
                        links.typeParameters = typeParameters;
                        links.instantiations = new ts.Map();
                        links.instantiations.set(getTypeListId(typeParameters), type);
                    }
                }
                else {
                    type = errorType;
                    if (declaration.kind === 339 /* SyntaxKind.JSDocEnumTag */) {
                        error(declaration.typeExpression.type, ts.Diagnostics.Type_alias_0_circularly_references_itself, symbolToString(symbol));
                    }
                    else {
                        error(ts.isNamedDeclaration(declaration) ? declaration.name : declaration || declaration, ts.Diagnostics.Type_alias_0_circularly_references_itself, symbolToString(symbol));
                    }
                }
                links.declaredType = type;
            }
            return links.declaredType;
        }
        function isStringConcatExpression(expr) {
            if (ts.isStringLiteralLike(expr)) {
                return true;