diff --git a/modules/openapi-generator/src/main/resources/typescript-rxjs/apis.mustache b/modules/openapi-generator/src/main/resources/typescript-rxjs/apis.mustache
index 0c70dc5e6ca9..3c548d7b547d 100644
--- a/modules/openapi-generator/src/main/resources/typescript-rxjs/apis.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-rxjs/apis.mustache
@@ -86,7 +86,7 @@ export class {{classname}} extends BaseAPI {
 
         {{/hasHttpHeaders}}
         {{#hasQueryParams}}
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             {{#queryParams}}
             {{#isListContainer}}
             {{#isCollectionFormatMulti}}
diff --git a/modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache b/modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache
index 555ee5aad668..7c58be70a52b 100644
--- a/modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache
@@ -140,7 +140,7 @@ export const COLLECTION_FORMATS = {
 export type Json = any;
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD';
 export type HttpHeaders = { [key: string]: string };
-export type HttpQuery = { [key: string]: string | number | null | boolean | Array<string | number | null | boolean> };
+export type HttpQuery = Partial<{ [key: string]: string | number | null | boolean | Array<string | number | null | boolean> }>; // partial is needed for strict mode
 export type HttpBody = Json | FormData;
 export type ModelPropertyNaming = 'camelCase' | 'snake_case' | 'PascalCase' | 'original';
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/default/apis/PetApi.ts b/samples/client/petstore/typescript-rxjs/builds/default/apis/PetApi.ts
index 16c0d116369e..a5328a8c7285 100644
--- a/samples/client/petstore/typescript-rxjs/builds/default/apis/PetApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/default/apis/PetApi.ts
@@ -123,7 +123,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.status && { 'status': requestParameters.status.join(COLLECTION_FORMATS['csv']) }),
         };
 
@@ -151,7 +151,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.tags && { 'tags': requestParameters.tags.join(COLLECTION_FORMATS['csv']) }),
         };
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/default/apis/UserApi.ts b/samples/client/petstore/typescript-rxjs/builds/default/apis/UserApi.ts
index ed3aaa8e371a..2194fdfe9f68 100644
--- a/samples/client/petstore/typescript-rxjs/builds/default/apis/UserApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/default/apis/UserApi.ts
@@ -139,7 +139,7 @@ export class UserApi extends BaseAPI {
         throwIfRequired(requestParameters, 'username', 'loginUser');
         throwIfRequired(requestParameters, 'password', 'loginUser');
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.username && { 'username': requestParameters.username }),
             ...(requestParameters.password && { 'password': requestParameters.password }),
         };
diff --git a/samples/client/petstore/typescript-rxjs/builds/default/runtime.ts b/samples/client/petstore/typescript-rxjs/builds/default/runtime.ts
index 1bbd8633b299..e71a012b04bd 100644
--- a/samples/client/petstore/typescript-rxjs/builds/default/runtime.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/default/runtime.ts
@@ -151,7 +151,7 @@ export const COLLECTION_FORMATS = {
 export type Json = any;
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD';
 export type HttpHeaders = { [key: string]: string };
-export type HttpQuery = { [key: string]: string | number | null | boolean | Array<string | number | null | boolean> };
+export type HttpQuery = Partial<{ [key: string]: string | number | null | boolean | Array<string | number | null | boolean> }>; // partial is needed for strict mode
 export type HttpBody = Json | FormData;
 export type ModelPropertyNaming = 'camelCase' | 'snake_case' | 'PascalCase' | 'original';
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/PetApi.ts b/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/PetApi.ts
index 16c0d116369e..a5328a8c7285 100644
--- a/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/PetApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/PetApi.ts
@@ -123,7 +123,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.status && { 'status': requestParameters.status.join(COLLECTION_FORMATS['csv']) }),
         };
 
@@ -151,7 +151,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.tags && { 'tags': requestParameters.tags.join(COLLECTION_FORMATS['csv']) }),
         };
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/UserApi.ts b/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/UserApi.ts
index ed3aaa8e371a..2194fdfe9f68 100644
--- a/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/UserApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/es6-target/apis/UserApi.ts
@@ -139,7 +139,7 @@ export class UserApi extends BaseAPI {
         throwIfRequired(requestParameters, 'username', 'loginUser');
         throwIfRequired(requestParameters, 'password', 'loginUser');
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.username && { 'username': requestParameters.username }),
             ...(requestParameters.password && { 'password': requestParameters.password }),
         };
diff --git a/samples/client/petstore/typescript-rxjs/builds/es6-target/runtime.ts b/samples/client/petstore/typescript-rxjs/builds/es6-target/runtime.ts
index 1bbd8633b299..e71a012b04bd 100644
--- a/samples/client/petstore/typescript-rxjs/builds/es6-target/runtime.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/es6-target/runtime.ts
@@ -151,7 +151,7 @@ export const COLLECTION_FORMATS = {
 export type Json = any;
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD';
 export type HttpHeaders = { [key: string]: string };
-export type HttpQuery = { [key: string]: string | number | null | boolean | Array<string | number | null | boolean> };
+export type HttpQuery = Partial<{ [key: string]: string | number | null | boolean | Array<string | number | null | boolean> }>; // partial is needed for strict mode
 export type HttpBody = Json | FormData;
 export type ModelPropertyNaming = 'camelCase' | 'snake_case' | 'PascalCase' | 'original';
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/PetApi.ts b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/PetApi.ts
index 16c0d116369e..a5328a8c7285 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/PetApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/PetApi.ts
@@ -123,7 +123,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.status && { 'status': requestParameters.status.join(COLLECTION_FORMATS['csv']) }),
         };
 
@@ -151,7 +151,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.tags && { 'tags': requestParameters.tags.join(COLLECTION_FORMATS['csv']) }),
         };
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/UserApi.ts b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/UserApi.ts
index ed3aaa8e371a..2194fdfe9f68 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/UserApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/apis/UserApi.ts
@@ -139,7 +139,7 @@ export class UserApi extends BaseAPI {
         throwIfRequired(requestParameters, 'username', 'loginUser');
         throwIfRequired(requestParameters, 'password', 'loginUser');
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.username && { 'username': requestParameters.username }),
             ...(requestParameters.password && { 'password': requestParameters.password }),
         };
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/runtime.ts b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/runtime.ts
index 1bbd8633b299..e71a012b04bd 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-interfaces/runtime.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-interfaces/runtime.ts
@@ -151,7 +151,7 @@ export const COLLECTION_FORMATS = {
 export type Json = any;
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD';
 export type HttpHeaders = { [key: string]: string };
-export type HttpQuery = { [key: string]: string | number | null | boolean | Array<string | number | null | boolean> };
+export type HttpQuery = Partial<{ [key: string]: string | number | null | boolean | Array<string | number | null | boolean> }>; // partial is needed for strict mode
 export type HttpBody = Json | FormData;
 export type ModelPropertyNaming = 'camelCase' | 'snake_case' | 'PascalCase' | 'original';
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/PetApi.ts b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/PetApi.ts
index 16c0d116369e..a5328a8c7285 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/PetApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/PetApi.ts
@@ -123,7 +123,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.status && { 'status': requestParameters.status.join(COLLECTION_FORMATS['csv']) }),
         };
 
@@ -151,7 +151,7 @@ export class PetApi extends BaseAPI {
             }),
         };
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.tags && { 'tags': requestParameters.tags.join(COLLECTION_FORMATS['csv']) }),
         };
 
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/UserApi.ts b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/UserApi.ts
index ed3aaa8e371a..2194fdfe9f68 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/UserApi.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/apis/UserApi.ts
@@ -139,7 +139,7 @@ export class UserApi extends BaseAPI {
         throwIfRequired(requestParameters, 'username', 'loginUser');
         throwIfRequired(requestParameters, 'password', 'loginUser');
 
-        const query: HttpQuery = <HttpQuery>{
+        const query: HttpQuery = {
             ...(requestParameters.username && { 'username': requestParameters.username }),
             ...(requestParameters.password && { 'password': requestParameters.password }),
         };
diff --git a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/runtime.ts b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/runtime.ts
index 1bbd8633b299..e71a012b04bd 100644
--- a/samples/client/petstore/typescript-rxjs/builds/with-npm-version/runtime.ts
+++ b/samples/client/petstore/typescript-rxjs/builds/with-npm-version/runtime.ts
@@ -151,7 +151,7 @@ export const COLLECTION_FORMATS = {
 export type Json = any;
 export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD';
 export type HttpHeaders = { [key: string]: string };
-export type HttpQuery = { [key: string]: string | number | null | boolean | Array<string | number | null | boolean> };
+export type HttpQuery = Partial<{ [key: string]: string | number | null | boolean | Array<string | number | null | boolean> }>; // partial is needed for strict mode
 export type HttpBody = Json | FormData;
 export type ModelPropertyNaming = 'camelCase' | 'snake_case' | 'PascalCase' | 'original';