diff --git a/modules/swagger-codegen/src/main/resources/typescript-node/api.mustache b/modules/swagger-codegen/src/main/resources/typescript-node/api.mustache
index 58cd4b31bf1..bbf1ef66c9b 100644
--- a/modules/swagger-codegen/src/main/resources/typescript-node/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/typescript-node/api.mustache
@@ -145,10 +145,10 @@ export class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{
 {{/vars}}
 
     {{#discriminator}}
-    static discriminator = {{discriminator}};
+    static discriminator = '{{discriminator}}';
     {{/discriminator}}
     {{^discriminator}}
-    static discriminator = undefined;
+    static discriminator: string = undefined;
     {{/discriminator}}
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
diff --git a/samples/client/petstore/typescript-node/default/.swagger-codegen/VERSION b/samples/client/petstore/typescript-node/default/.swagger-codegen/VERSION
index a6254504e40..855ff9501eb 100644
--- a/samples/client/petstore/typescript-node/default/.swagger-codegen/VERSION
+++ b/samples/client/petstore/typescript-node/default/.swagger-codegen/VERSION
@@ -1 +1 @@
-2.3.1
\ No newline at end of file
+2.4.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/client/petstore/typescript-node/default/api.ts b/samples/client/petstore/typescript-node/default/api.ts
index 1e75275a066..963cdc0717a 100644
--- a/samples/client/petstore/typescript-node/default/api.ts
+++ b/samples/client/petstore/typescript-node/default/api.ts
@@ -144,7 +144,7 @@ export class ApiResponse {
     'type': string;
     'message': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -175,7 +175,7 @@ export class Category {
     'id': number;
     'name': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -208,7 +208,7 @@ export class Order {
     'status': Order.StatusEnum;
     'complete': boolean;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -268,7 +268,7 @@ export class Pet {
     */
     'status': Pet.StatusEnum;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -321,7 +321,7 @@ export class Tag {
     'id': number;
     'name': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -356,7 +356,7 @@ export class User {
     */
     'userStatus': number;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -1507,7 +1507,7 @@ export class UserApi {
     /**
      * 
      * @summary Get user by user name
-     * @param username The name that needs to be fetched. Use user1 for testing. 
+     * @param username The name that needs to be fetched. Use user1 for testing.
      */
     public getUserByName (username: string) : Promise<{ response: http.ClientResponse; body: User;  }> {
         const localVarPath = this.basePath + '/user/{username}'
diff --git a/samples/client/petstore/typescript-node/npm/.swagger-codegen/VERSION b/samples/client/petstore/typescript-node/npm/.swagger-codegen/VERSION
index a6254504e40..855ff9501eb 100644
--- a/samples/client/petstore/typescript-node/npm/.swagger-codegen/VERSION
+++ b/samples/client/petstore/typescript-node/npm/.swagger-codegen/VERSION
@@ -1 +1 @@
-2.3.1
\ No newline at end of file
+2.4.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/client/petstore/typescript-node/npm/api.ts b/samples/client/petstore/typescript-node/npm/api.ts
index 1e75275a066..963cdc0717a 100644
--- a/samples/client/petstore/typescript-node/npm/api.ts
+++ b/samples/client/petstore/typescript-node/npm/api.ts
@@ -144,7 +144,7 @@ export class ApiResponse {
     'type': string;
     'message': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -175,7 +175,7 @@ export class Category {
     'id': number;
     'name': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -208,7 +208,7 @@ export class Order {
     'status': Order.StatusEnum;
     'complete': boolean;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -268,7 +268,7 @@ export class Pet {
     */
     'status': Pet.StatusEnum;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -321,7 +321,7 @@ export class Tag {
     'id': number;
     'name': string;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -356,7 +356,7 @@ export class User {
     */
     'userStatus': number;
 
-    static discriminator = undefined;
+    static discriminator: string = undefined;
 
     static attributeTypeMap: Array<{name: string, baseName: string, type: string}> = [
         {
@@ -1507,7 +1507,7 @@ export class UserApi {
     /**
      * 
      * @summary Get user by user name
-     * @param username The name that needs to be fetched. Use user1 for testing. 
+     * @param username The name that needs to be fetched. Use user1 for testing.
      */
     public getUserByName (username: string) : Promise<{ response: http.ClientResponse; body: User;  }> {
         const localVarPath = this.basePath + '/user/{username}'