diff --git a/src/harness/fourslashImpl.ts b/src/harness/fourslashImpl.ts
index f2a17d4eee58d..628181c8f0f28 100644
--- a/src/harness/fourslashImpl.ts
+++ b/src/harness/fourslashImpl.ts
@@ -2451,37 +2451,37 @@ namespace FourSlash {
         private classificationToIdentifier(classification: number){
 
             const tokenTypes: string[] = [];
-            tokenTypes[ts.classifier.modern.TokenType.class] = "class";
-            tokenTypes[ts.classifier.modern.TokenType.enum] = "enum";
-            tokenTypes[ts.classifier.modern.TokenType.interface] = "interface";
-            tokenTypes[ts.classifier.modern.TokenType.namespace] = "namespace";
-            tokenTypes[ts.classifier.modern.TokenType.typeParameter] = "typeParameter";
-            tokenTypes[ts.classifier.modern.TokenType.type] = "type";
-            tokenTypes[ts.classifier.modern.TokenType.parameter] = "parameter";
-            tokenTypes[ts.classifier.modern.TokenType.variable] = "variable";
-            tokenTypes[ts.classifier.modern.TokenType.enumMember] = "enumMember";
-            tokenTypes[ts.classifier.modern.TokenType.property] = "property";
-            tokenTypes[ts.classifier.modern.TokenType.function] = "function";
-            tokenTypes[ts.classifier.modern.TokenType.member] = "member";
+            tokenTypes[ts.classifier.v2020.TokenType.class] = "class";
+            tokenTypes[ts.classifier.v2020.TokenType.enum] = "enum";
+            tokenTypes[ts.classifier.v2020.TokenType.interface] = "interface";
+            tokenTypes[ts.classifier.v2020.TokenType.namespace] = "namespace";
+            tokenTypes[ts.classifier.v2020.TokenType.typeParameter] = "typeParameter";
+            tokenTypes[ts.classifier.v2020.TokenType.type] = "type";
+            tokenTypes[ts.classifier.v2020.TokenType.parameter] = "parameter";
+            tokenTypes[ts.classifier.v2020.TokenType.variable] = "variable";
+            tokenTypes[ts.classifier.v2020.TokenType.enumMember] = "enumMember";
+            tokenTypes[ts.classifier.v2020.TokenType.property] = "property";
+            tokenTypes[ts.classifier.v2020.TokenType.function] = "function";
+            tokenTypes[ts.classifier.v2020.TokenType.member] = "member";
 
             const tokenModifiers: string[] = [];
-            tokenModifiers[ts.classifier.modern.TokenModifier.async] = "async";
-            tokenModifiers[ts.classifier.modern.TokenModifier.declaration] = "declaration";
-            tokenModifiers[ts.classifier.modern.TokenModifier.readonly] = "readonly";
-            tokenModifiers[ts.classifier.modern.TokenModifier.static] = "static";
-            tokenModifiers[ts.classifier.modern.TokenModifier.local] = "local";
-            tokenModifiers[ts.classifier.modern.TokenModifier.defaultLibrary] = "defaultLibrary";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.async] = "async";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.declaration] = "declaration";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.readonly] = "readonly";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.static] = "static";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.local] = "local";
+            tokenModifiers[ts.classifier.v2020.TokenModifier.defaultLibrary] = "defaultLibrary";
 
 
             function getTokenTypeFromClassification(tsClassification: number): number | undefined {
-                if (tsClassification > ts.classifier.modern.TokenEncodingConsts.modifierMask) {
-                    return (tsClassification >> ts.classifier.modern.TokenEncodingConsts.typeOffset) - 1;
+                if (tsClassification > ts.classifier.v2020.TokenEncodingConsts.modifierMask) {
+                    return (tsClassification >> ts.classifier.v2020.TokenEncodingConsts.typeOffset) - 1;
                 }
                 return undefined;
             }
 
             function getTokenModifierFromClassification(tsClassification: number) {
-                return tsClassification & ts.classifier.modern.TokenEncodingConsts.modifierMask;
+                return tsClassification & ts.classifier.v2020.TokenEncodingConsts.modifierMask;
             }
 
             const typeIdx = getTokenTypeFromClassification(classification) || 0;
diff --git a/src/harness/fourslashInterfaceImpl.ts b/src/harness/fourslashInterfaceImpl.ts
index 6a7c3ae838939..e6417566b3084 100644
--- a/src/harness/fourslashInterfaceImpl.ts
+++ b/src/harness/fourslashInterfaceImpl.ts
@@ -752,12 +752,20 @@ namespace FourSlashInterface {
         }
     }
 
-    interface Classification {
-        classificationType: ts.ClassificationTypeNames | string;
+    interface OlderClassification {
+        classificationType: ts.ClassificationTypeNames;
+        text: string;
+        textSpan?: FourSlash.TextSpan;
+    }
+
+    // The VS Code LSP
+    interface ModernClassification {
+        classificationType: string;
         text?: string;
         textSpan?: FourSlash.TextSpan;
     }
 
+    type Classification = OlderClassification | ModernClassification;
 
     export function classification(format: ts.SemanticClassificationFormat) {
 
@@ -774,6 +782,8 @@ namespace FourSlashInterface {
             };
         }
 
+        // Defaults to the previous semantic classifier factory functions
+
         function comment(text: string, position?: number): Classification {
             return getClassification(ts.ClassificationTypeNames.comment, text, position);
         }
diff --git a/src/services/classifier2020.ts b/src/services/classifier2020.ts
index adbac20b3e7e6..a689bdadeb7f0 100644
--- a/src/services/classifier2020.ts
+++ b/src/services/classifier2020.ts
@@ -1,5 +1,5 @@
 /** @internal */
-namespace ts.classifier.modern {
+namespace ts.classifier.v2020 {
 
     /** @internal */
     export const enum TokenEncodingConsts {
diff --git a/src/services/services.ts b/src/services/services.ts
index f29acb01100af..d7f0dc581af84 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1806,7 +1806,7 @@ namespace ts {
 
             const responseFormat = format || SemanticClassificationFormat.Original;
             if (responseFormat === SemanticClassificationFormat.TwentyTwenty) {
-                return classifier.modern.getSemanticClassifications(program, cancellationToken, getValidSourceFile(fileName), span);
+                return classifier.v2020.getSemanticClassifications(program, cancellationToken, getValidSourceFile(fileName), span);
             }
             else {
                 return ts.getSemanticClassifications(program.getTypeChecker(), cancellationToken, getValidSourceFile(fileName), program.getClassifiableNames(), span);
@@ -1825,7 +1825,7 @@ namespace ts {
                 return ts.getEncodedSemanticClassifications(program.getTypeChecker(), cancellationToken, getValidSourceFile(fileName), program.getClassifiableNames(), span);
             }
             else {
-                return classifier.modern.getEncodedSemanticClassifications(program, cancellationToken, getValidSourceFile(fileName), span);
+                return classifier.v2020.getEncodedSemanticClassifications(program, cancellationToken, getValidSourceFile(fileName), span);
             }
         }