Allow array items in TypeScript to be nullable (#19157)

* Allow array items in TypeScript to be nullable

* Regenerate samples

* Remove duplicate nullable array items codegen

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractTypeScriptClientCodegen.java

@@ -629,7 +629,11 @@ public abstract class AbstractTypeScriptClientCodegen extends DefaultCodegen imp
     public String getTypeDeclaration(Schema p) {
         if (ModelUtils.isArraySchema(p)) {
             Schema<?> items = ModelUtils.getSchemaItems(p);
-            return getSchemaType(p) + "<" + getTypeDeclaration(unaliasSchema(items)) + ">";
+            String postfix = "";
+            if (Boolean.TRUE.equals(items.getNullable())) {
+                postfix = " | null";
+            }
+            return getSchemaType(p) + "<" + getTypeDeclaration(unaliasSchema(items)) + postfix + ">";
         } else if (ModelUtils.isMapSchema(p)) {
             Schema<?> inner = getSchemaAdditionalProperties(p);
             String nullSafeSuffix = getNullSafeAdditionalProps() ? " | undefined" : "";

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptClientCodegen.java

@@ -458,12 +458,8 @@ public class TypeScriptClientCodegen extends AbstractTypeScriptClientCodegen imp
 
     @Override
     public String getTypeDeclaration(Schema p) {
-        Schema inner;
+        if (ModelUtils.isMapSchema(p)) {
-        if (ModelUtils.isArraySchema(p)) {
+            Schema<?> inner = getSchemaAdditionalProperties(p);
-            inner = ModelUtils.getSchemaItems(p);
-            return this.getSchemaType(p) + "<" + this.getTypeDeclaration(unaliasSchema(inner)) + ">";
-        } else if (ModelUtils.isMapSchema(p)) {
-            inner = getSchemaAdditionalProperties(p);
             String postfix = "";
             if (Boolean.TRUE.equals(inner.getNullable())) {
                 postfix = " | null";

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java

@@ -804,10 +804,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
                     newItemsDataType = "string";
                     var.dataTypeAlternate = var.dataTypeAlternate.replace("number", newItemsDataType);
                 }
-
-                if (var.itemsAreNullable()) {
-                    var.dataTypeAlternate = var.dataTypeAlternate.replace(newItemsDataType, newItemsDataType + " | null");
-                }
             } else if (var.isEnum) {
                 var.dataTypeAlternate = var.datatypeWithEnum;
             } else if (var.isModel) {
@@ -825,10 +821,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
         return parentIsEntity;
     }
 
-    private boolean itemsAreNullable(ExtendedCodegenProperty var) {
-        return var.items.isNullable || (var.items.items != null && var.items.items.isNullable);
-    }
-
     private void escapeOperationIds(OperationsMap operations) {
         for (CodegenOperation _op : operations.getOperations().getOperation()) {
             ExtendedCodegenOperation op = (ExtendedCodegenOperation) _op;
@@ -925,10 +917,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
                         newItemsDataType = "string";
                         param.dataTypeAlternate = param.dataTypeAlternate.replace("number", newItemsDataType);
                     }
-
-                    if (param.itemsAreNullable()) {
-                        param.dataTypeAlternate = param.dataTypeAlternate.replace(newItemsDataType, newItemsDataType + " | null");
-                    }
                 } else if (param.isEnum) {
                     param.dataTypeAlternate = param.datatypeWithEnum;
                 } else if (param.isModel) {
@@ -1022,16 +1010,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
         return false;
     }
 
-    private static boolean itemsAreNullable(CodegenProperty items) {
-        if (items == null) {
-            return true;
-        }
-        if (items.items != null) {
-            return itemsAreNullable(items.items);
-        }
-        return items.isNullable;
-    }
-
     private static String getItemsDataType(CodegenProperty items) {
         if (items == null) {
             return null;
@@ -1052,10 +1030,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
             return TypeScriptFetchClientCodegen.itemsAreUniqueId(this.items);
         }
 
-        public boolean itemsAreNullable() {
-            return TypeScriptFetchClientCodegen.itemsAreNullable(this.items);
-        }
-
         public String getItemsDataType() {
             return TypeScriptFetchClientCodegen.getItemsDataType(this.items);
         }
@@ -1206,10 +1180,6 @@ public class TypeScriptFetchClientCodegen extends AbstractTypeScriptClientCodege
             return TypeScriptFetchClientCodegen.itemsAreUniqueId(this.items);
         }
 
-        public boolean itemsAreNullable() {
-            return TypeScriptFetchClientCodegen.itemsAreNullable(this.items);
-        }
-
         public String getItemsDataType() {
             return TypeScriptFetchClientCodegen.getItemsDataType(this.items);
         }

modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/TypeScriptClientCodegenTest.java

@@ -157,4 +157,15 @@ public class TypeScriptClientCodegenTest {
             Assert.fail("Exception was thrown.");
         }
     }
+
+    @Test
+    public void arrayItemsCanBeNullable() throws Exception {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/array-nullable-items.yaml");
+        final DefaultCodegen codegen = new TypeScriptClientCodegen();
+        codegen.setOpenAPI(openAPI);
+        final ArraySchema schema = (ArraySchema) openAPI.getComponents().getSchemas().get("ArrayWithNullableItemsModel")
+            .getProperties()
+            .get("foo");
+        Assert.assertEquals(codegen.getTypeDeclaration(schema), "Array<string | null>");
+    }
 }

samples/client/petstore/typescript-axios/builds/test-petstore/api.ts

@@ -1129,16 +1129,16 @@ export interface NullableClass {
     'array_nullable_prop'?: Array<object> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    'array_and_items_nullable_prop'?: Array<object> | null;
+    'array_and_items_nullable_prop'?: Array<object | null> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    'array_items_nullable'?: Array<object>;
+    'array_items_nullable'?: Array<object | null>;
     /**
      * 
      * @type {{ [key: string]: object; }}

samples/client/petstore/typescript-axios/builds/with-fake-endpoints-models-for-testing-with-http-signature/api.ts

@@ -857,16 +857,16 @@ export interface NullableClass {
     'array_nullable_prop'?: Array<object> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    'array_and_items_nullable_prop'?: Array<object> | null;
+    'array_and_items_nullable_prop'?: Array<object | null> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    'array_items_nullable'?: Array<object>;
+    'array_items_nullable'?: Array<object | null>;
     /**
      * 
      * @type {{ [key: string]: object; }}

samples/client/petstore/typescript-fetch/builds/default-v3.0/models/NullableClass.ts

@@ -64,16 +64,16 @@ export interface NullableClass {
     arrayNullableProp?: Array<object> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    arrayAndItemsNullableProp?: Array<object> | null;
+    arrayAndItemsNullableProp?: Array<object | null> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    arrayItemsNullable?: Array<object>;
+    arrayItemsNullable?: Array<object | null>;
     /**
      * 
      * @type {{ [key: string]: object; }}

samples/client/petstore/typescript-fetch/builds/sagas-and-records/src/apis/PetApi.ts

@@ -76,7 +76,7 @@ export interface UpdatePetRequest {
 
 export interface UpdatePetRegionsRequest {
     petId: number;
-    newRegions: Array<Array<number>>;
+    newRegions: Array<Array<number | null>>;
 }
 
 export interface UpdatePetWithFormRequest {
@@ -509,7 +509,7 @@ export class PetApi extends runtime.BaseAPI {
     /**
      * Updates the pet regions.
      */
-    async updatePetRegions(petId: number, newRegions: Array<Array<number>>, initOverrides?: RequestInit | runtime.InitOverrideFunction): Promise<PetRegionsResponse> {
+    async updatePetRegions(petId: number, newRegions: Array<Array<number | null>>, initOverrides?: RequestInit | runtime.InitOverrideFunction): Promise<PetRegionsResponse> {
         const response = await this.updatePetRegionsRaw({ petId: petId, newRegions: newRegions }, initOverrides);
         return await response.value();
     }

samples/client/petstore/typescript-fetch/builds/sagas-and-records/src/models/Pet.ts

@@ -166,10 +166,10 @@ export interface Pet {
     status: PetStatusEnum;
     /**
      * An array of all 15-minute time slots in 24 hours.
-     * @type {Array<Array<number>>}
+     * @type {Array<Array<number | null>>}
      * @memberof Pet
      */
-    regions?: Array<Array<number>>;
+    regions?: Array<Array<number | null>>;
 }
 
 

samples/client/petstore/typescript-fetch/builds/sagas-and-records/src/models/PetRegionsResponse.ts

@@ -34,10 +34,10 @@ export interface PetRegionsResponse {
     meta: ResponseMeta;
     /**
      * An array of all 15-minute time slots in 24 hours.
-     * @type {Array<Array<number>>}
+     * @type {Array<Array<number | null>>}
      * @memberof PetRegionsResponse
      */
-    data?: Array<Array<number>>;
+    data?: Array<Array<number | null>>;
 }
 
 /**

samples/client/petstore/typescript-fetch/builds/snakecase-discriminator/models/NullableClass.ts

@@ -64,16 +64,16 @@ export interface NullableClass {
     arrayNullableProp?: Array<object> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    arrayAndItemsNullableProp?: Array<object> | null;
+    arrayAndItemsNullableProp?: Array<object | null> | null;
     /**
      * 
-     * @type {Array<object>}
+     * @type {Array<object | null>}
      * @memberof NullableClass
      */
-    arrayItemsNullable?: Array<object>;
+    arrayItemsNullable?: Array<object | null>;
     /**
      * 
      * @type {{ [key: string]: object; }}