Expose signatureToString, addSupressAnyReturn Flag

Author: aozgaa

src/compiler/checker.ts

@@ -94,6 +94,7 @@ namespace ts {
             getExportSpecifierLocalTargetSymbol,
             getTypeAtLocation: getTypeOfNode,
             getPropertySymbolOfDestructuringAssignment,
+            signatureToString,
             typeToString,
             getSymbolDisplayBuilder,
             symbolToString,
@@ -2674,6 +2675,11 @@ namespace ts {
             }
 
             function buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, symbolStack?: Symbol[]) {
+                const returnType = getReturnTypeOfSignature(signature);
+                if (flags & TypeFormatFlags.supressAnyReturnType && isTypeAny(returnType)) {
+                    return;
+                }
+
                 if (flags & TypeFormatFlags.WriteArrowStyleSignature) {
                     writeSpace(writer);
                     writePunctuation(writer, SyntaxKind.EqualsGreaterThanToken);
@@ -2687,7 +2693,6 @@ namespace ts {
                     buildTypePredicateDisplay(signature.typePredicate, writer, enclosingDeclaration, flags, symbolStack);
                 }
                 else {
-                    const returnType = getReturnTypeOfSignature(signature);
                     buildTypeDisplay(returnType, writer, enclosingDeclaration, flags, symbolStack);
                 }
             }
@@ -4136,7 +4141,7 @@ namespace ts {
             return <InterfaceTypeWithDeclaredMembers>type;
         }
 
-        function getTypeWithThisArgument(type: Type, thisArgument?: Type) {
+        function getTypeWithThisArgument(type: Type, thisArgument?: Type): Type {
             if (getObjectFlags(type) & ObjectFlags.Reference) {
                 return createTypeReference((<TypeReference>type).target,
                     concatenate((<TypeReference>type).typeArguments, [thisArgument || (<TypeReference>type).target.thisType]));

src/compiler/types.ts

@@ -2257,7 +2257,7 @@ namespace ts {
         getNonNullableType(type: Type): Type;
         getIntersectionType(types: Type[], aliasSymbol?: Symbol, aliasTypeArguments?: Type[]): Type;
         getUnionType(types: Type[], subtypeReduction?: boolean, aliasSymbol?: Symbol, aliasTypeArguments?: Type[]): Type;
-
+        
         getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
         getSymbolOfNode(node: Node): Symbol;
         getSymbolAtLocation(node: Node): Symbol;
@@ -2267,6 +2267,7 @@ namespace ts {
         getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol;
         getTypeAtLocation(node: Node): Type;
         getTypeFromTypeReference(node: TypeReferenceNode | ExpressionWithTypeArguments | JSDocTypeReference): Type;
+        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
         typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
         symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): string;
         getSymbolDisplayBuilder(): SymbolDisplayBuilder;
@@ -2348,6 +2349,7 @@ namespace ts {
         InFirstTypeArgument             = 0x00000100,  // Writing first type argument of the instantiated type
         InTypeAlias                     = 0x00000200,  // Writing type in type alias declaration
         UseTypeAliasValue               = 0x00000400,  // Serialize the type instead of using type-alias. This is needed when we emit declaration file.
+        supressAnyReturnType            = 0x00000800,  // If the return type is any-like, don't offer a return type.
     }
 
     export const enum SymbolFormatFlags {