Remove unused UseTypeAliasValue flag

Author: Andy Hanson

src/compiler/declarationEmitter.ts

@@ -349,7 +349,6 @@ namespace ts {
                 errorNameNode = declaration.name;
                 const format = TypeFormatFlags.UseTypeOfFunction |
                     TypeFormatFlags.WriteClassExpressionAsTypeLiteral |
-                    TypeFormatFlags.UseTypeAliasValue |
                     (shouldUseResolverType ? TypeFormatFlags.AddUndefined : 0);
                 resolver.writeTypeOfDeclaration(declaration, enclosingDeclaration, format, writer);
                 errorNameNode = undefined;
@@ -368,7 +367,7 @@ namespace ts {
                 resolver.writeReturnTypeOfSignatureDeclaration(
                     signature,
                     enclosingDeclaration,
-                    TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.UseTypeAliasValue | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,
+                    TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,
                     writer);
                 errorNameNode = undefined;
             }
@@ -633,7 +632,7 @@ namespace ts {
             resolver.writeTypeOfExpression(
                 expr,
                 enclosingDeclaration,
-                TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.UseTypeAliasValue | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,
+                TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,
                 writer);
             write(";");
             writeLine();

src/compiler/types.ts

@@ -2717,7 +2717,6 @@ namespace ts {
         UseFullyQualifiedType           = 1 << 8,  // Write out the fully qualified type name (eg. Module.Type, instead of Type)
         InFirstTypeArgument             = 1 << 9,  // Writing first type argument of the instantiated type
         InTypeAlias                     = 1 << 10,  // Writing type in type alias declaration
-        UseTypeAliasValue               = 1 << 11,  // Serialize the type instead of using type-alias. This is needed when we emit declaration file.
         SuppressAnyReturnType           = 1 << 12,  // If the return type is any-like, don't offer a return type.
         AddUndefined                    = 1 << 13,  // Add undefined to types of initialized, non-optional parameters
         WriteClassExpressionAsTypeLiteral = 1 << 14, // Write a type literal instead of (Anonymous class)