feat(codegen): support explicit tag overrides without altering defaults

docs/rtk-query/usage/code-generation.mdx

@@ -67,9 +67,12 @@ npx @rtk-query/codegen-openapi openapi-config.ts
 If your OpenAPI specification uses [tags](https://swagger.io/docs/specification/grouping-operations-with-tags/), you can specify the `tag` option to the codegen.
 That will result in all generated endpoints having `providesTags`/`invalidatesTags` declarations for the `tags` of their respective operation definition.
 
-Note that this will only result in string tags with no ids, so it might lead to scenarios where too much is invalidated and unneccessary requests are made on mutation.
+Note that this will only result in string tags with no ids, so it might lead to scenarios where too much is invalidated and unnecessary requests are made on mutation.
 
-In that case it is still recommended to manually specify tags by using [`enhanceEndpoints`](../api/created-api/code-splitting.mdx) on top of the generated api and manually declare `providesTags`/`invalidatesTags`.
+In that case you have two options:
+
+1. Use [`endpointOverrides`](#overriding-tags) to customize tags for specific endpoints during code generation
+2. Use [`enhanceEndpoints`](../api/created-api/code-splitting.mdx) after generation to manually add more specific `providesTags`/`invalidatesTags` with IDs
 
 ### Programmatic usage
 
@@ -120,6 +123,16 @@ interface SimpleUsage {
     | Array<string | RegExp | EndpointMatcherFunction>
   endpointOverrides?: EndpointOverrides[]
   flattenArg?: boolean
+}
+
+export type EndpointOverrides = {
+  pattern: EndpointMatcher
+} & AtLeastOneOf<{
+  type: 'mutation' | 'query'
+  parameterFilter: ParameterMatcher
+  providesTags: string[]
+  invalidatesTags: string[]
+}>
   useEnumType?: boolean
   outputRegexConstants?: boolean
   httpResolverOptions?: SwaggerParser.HTTPResolverOptions
@@ -189,6 +202,53 @@ const withOverride: ConfigFile = {
 }
 ```
 
+#### Overriding tags
+
+You can override the `providesTags` and `invalidatesTags` generated for any endpoint, regardless of whether the global `tag` option is enabled:
+
+```ts no-transpile title="openapi-config.ts"
+const withTagOverrides: ConfigFile = {
+  // ...
+  tag: true, // or false - overrides work either way
+  endpointOverrides: [
+    {
+      // Override the tags for a specific query
+      pattern: 'getPetById',
+      providesTags: ['SinglePet', 'PetDetails'],
+    },
+    {
+      // Remove auto-generated tags by providing an empty array
+      pattern: 'deletePet',
+      invalidatesTags: [],
+    },
+    {
+      // Add both providesTags AND invalidatesTags to any endpoint
+      pattern: 'updatePet',
+      providesTags: ['LastUpdatedPet'],
+      invalidatesTags: ['Pet', 'PetList'],
+    },
+  ],
+}
+```
+
+**Key behaviors:**
+
+- Tag overrides take precedence over auto-generated tags from the OpenAPI `tags` field
+- You can use an empty array (`[]`) to explicitly remove tags from an endpoint
+- Both `providesTags` and `invalidatesTags` can be set on any endpoint type (query or mutation)
+- Overrides work regardless of whether the global `tag: true` option is set
+
+This is useful when:
+
+- The OpenAPI tags don't match your caching strategy
+- You need more specific cache invalidation than the default tag generation provides
+- A mutation should also provide tags (e.g., login returning user data)
+- A query should also invalidate tags (e.g., polling that triggers cache updates)
+
+:::note
+When using tag overrides with `tag: false`, the overridden tags will be emitted in the generated code, but they won't be automatically added to `addTagTypes`. You may need to manually add your custom tags to the base API's `tagTypes` array.
+:::
+
 #### Generating hooks
 
 Setting `hooks: true` will generate `useQuery` and `useMutation` hook exports. If you also want `useLazyQuery` hooks generated or more granular control, you can also pass an object in the shape of: `{ queries: boolean; lazyQueries: boolean; mutations: boolean }`.

packages/rtk-query-codegen-openapi/src/codegen.ts

@@ -119,6 +119,7 @@ export function generateEndpointDefinition({
   endpointBuilder = defaultEndpointBuilder,
   extraEndpointsProps,
   tags,
+  tagOverrides,
 }: {
   operationName: string;
   type: 'query' | 'mutation';
@@ -127,14 +128,37 @@ export function generateEndpointDefinition({
   queryFn: ts.Expression;
   endpointBuilder?: ts.Identifier;
   extraEndpointsProps: ObjectPropertyDefinitions;
-  tags: string[];
+  tags?: string[];
+  tagOverrides?: { providesTags?: string[]; invalidatesTags?: string[] };
 }) {
   const objectProperties = generateObjectProperties({ query: queryFn, ...extraEndpointsProps });
-  if (tags.length > 0) {
+  const providesTags =
+    tagOverrides && 'providesTags' in tagOverrides
+      ? tagOverrides.providesTags
+      : type === 'query'
+        ? tags
+        : undefined;
+  const invalidatesTags =
+    tagOverrides && 'invalidatesTags' in tagOverrides
+      ? tagOverrides.invalidatesTags
+      : type === 'mutation'
+        ? tags
+        : undefined;
+
+  if (providesTags !== undefined) {
+    objectProperties.push(
+      factory.createPropertyAssignment(
+        factory.createIdentifier('providesTags'),
+        factory.createArrayLiteralExpression(providesTags.map((tag) => factory.createStringLiteral(tag)), false)
+      )
+    );
+  }
+
+  if (invalidatesTags !== undefined) {
     objectProperties.push(
       factory.createPropertyAssignment(
-        factory.createIdentifier(type === 'query' ? 'providesTags' : 'invalidatesTags'),
-        factory.createArrayLiteralExpression(tags.map((tag) => factory.createStringLiteral(tag), false))
+        factory.createIdentifier('invalidatesTags'),
+        factory.createArrayLiteralExpression(invalidatesTags.map((tag) => factory.createStringLiteral(tag)), false)
       )
     );
   }

packages/rtk-query-codegen-openapi/src/generate.ts

@@ -315,7 +315,7 @@ export async function generateApi(
       operation: { responses, requestBody },
     } = operationDefinition;
     const operationName = getOperationName({ verb, path, operation });
-    const tags = tag ? getTags({ verb, pathItem }) : [];
+    const tags = tag ? getTags({ verb, pathItem }) : undefined;
     const isQuery = testIsQuery(verb, overrides);
 
     const returnsJson = apiGen.getResponseType(responses) === 'json';
@@ -470,6 +470,14 @@ export async function generateApi(
       ).name
     );
 
+    const tagOverrides =
+      overrides && (overrides.providesTags !== undefined || overrides.invalidatesTags !== undefined)
+        ? {
+            ...(overrides.providesTags !== undefined ? { providesTags: overrides.providesTags } : {}),
+            ...(overrides.invalidatesTags !== undefined ? { invalidatesTags: overrides.invalidatesTags } : {}),
+          }
+        : undefined;
+
     return generateEndpointDefinition({
       operationName: operationNameSuffix ? capitalize(operationName + operationNameSuffix) : operationName,
       type: isQuery ? 'query' : 'mutation',
@@ -487,6 +495,7 @@ export async function generateApi(
         ? generateQueryEndpointProps({ operationDefinition })
         : generateMutationEndpointProps({ operationDefinition }),
       tags,
+      tagOverrides,
     });
   }
 

packages/rtk-query-codegen-openapi/src/types.ts

@@ -154,11 +154,34 @@ export interface OutputFileOptions extends Partial<CommonOptions> {
   useEnumType?: boolean;
 }
 
+/**
+ * Configuration for overriding specific endpoint behaviors during code generation.
+ * At least one override option (besides `pattern`) must be specified.
+ */
 export type EndpointOverrides = {
+  /** Pattern to match endpoint names. Can be a string, RegExp, or matcher function. */
   pattern: EndpointMatcher;
 } & AtLeastOneKey<{
+  /** Override the endpoint type (query vs mutation) when the inferred type is incorrect. */
   type: 'mutation' | 'query';
+  /** Filter which parameters are included in the generated endpoint. Path parameters cannot be filtered. */
   parameterFilter: ParameterMatcher;
+  /**
+   * Override providesTags for this endpoint.
+   * Takes precedence over auto-generated tags from OpenAPI spec.
+   * Use an empty array to explicitly omit providesTags.
+   * Works regardless of the global `tag` setting and endpoint type.
+   * @example ['Pet', 'SinglePet']
+   */
+  providesTags: string[];
+  /**
+   * Override invalidatesTags for this endpoint.
+   * Takes precedence over auto-generated tags from OpenAPI spec.
+   * Use an empty array to explicitly omit invalidatesTags.
+   * Works regardless of the global `tag` setting and endpoint type.
+   * @example ['Pet', 'PetList']
+   */
+  invalidatesTags: string[];
 }>;
 
 export type ConfigFile =

packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts

@@ -172,6 +172,118 @@ describe('endpoint overrides', () => {
     expect(api).not.toMatch(/headers: {/);
     expect(api).toMatchSnapshot('should remove all parameters except for findPetsByStatus');
   });
+
+  it('should override generated tags', async () => {
+    const api = await generateEndpoints({
+      unionUndefined: true,
+      tag: true,
+      apiFile: './fixtures/emptyApi.ts',
+      schemaFile: resolve(__dirname, 'fixtures/petstore.json'),
+      filterEndpoints: ['getPetById', 'deletePet'],
+      endpointOverrides: [
+        {
+          pattern: 'getPetById',
+          providesTags: ['CustomQueryTag'],
+        },
+        {
+          pattern: 'deletePet',
+          invalidatesTags: [],
+        },
+      ],
+    });
+
+    expect(api).toMatch(/getPetById: build\.query[\s\S]*providesTags: \["CustomQueryTag"\]/);
+    expect(api).not.toMatch(/getPetById: build\.query[\s\S]*providesTags: \["pet"\]/);
+    expect(api).toMatch(/deletePet: build\.mutation[\s\S]*invalidatesTags: \[\]/);
+    expect(api).not.toMatch(/deletePet: build\.mutation[\s\S]*invalidatesTags: \["pet"\]/);
+  });
+
+  it('should allow tag overrides when tag generation is disabled', async () => {
+    const api = await generateEndpoints({
+      unionUndefined: true,
+      apiFile: './fixtures/emptyApi.ts',
+      schemaFile: resolve(__dirname, 'fixtures/petstore.json'),
+      filterEndpoints: ['getPetById', 'deletePet'],
+      endpointOverrides: [
+        {
+          pattern: 'getPetById',
+          providesTags: ['ManualProvides'],
+        },
+        {
+          pattern: 'deletePet',
+          invalidatesTags: ['ManualInvalidates'],
+        },
+      ],
+    });
+
+    expect(api).toMatch(/getPetById: build\.query[\s\S]*providesTags: \["ManualProvides"\]/);
+    expect(api).toMatch(/deletePet: build\.mutation[\s\S]*invalidatesTags: \["ManualInvalidates"\]/);
+    expect(api).not.toMatch(/providesTags: \[\]/);
+    expect(api).not.toMatch(/invalidatesTags: \[\]/);
+  });
+
+  it('allows overriding tags regardless of inferred endpoint type', async () => {
+    const api = await generateEndpoints({
+      unionUndefined: true,
+      apiFile: './fixtures/emptyApi.ts',
+      schemaFile: resolve(__dirname, 'fixtures/petstore.json'),
+      filterEndpoints: 'loginUser',
+      endpointOverrides: [
+        {
+          pattern: 'loginUser',
+          type: 'mutation',
+          providesTags: ['LoginStatus'],
+        },
+      ],
+    });
+
+    expect(api).toMatch(/loginUser: build\.mutation/);
+    expect(api).toMatch(/providesTags: \["LoginStatus"\]/);
+    expect(api).not.toMatch(/invalidatesTags:/);
+  });
+
+  it('allows overriding both providesTags and invalidatesTags simultaneously', async () => {
+    const api = await generateEndpoints({
+      unionUndefined: true,
+      tag: true,
+      apiFile: './fixtures/emptyApi.ts',
+      schemaFile: resolve(__dirname, 'fixtures/petstore.json'),
+      filterEndpoints: 'findPetsByStatus',
+      endpointOverrides: [
+        {
+          pattern: 'findPetsByStatus',
+          providesTags: ['CustomProvide'],
+          invalidatesTags: ['CustomInvalidate'],
+        },
+      ],
+    });
+
+    expect(api).toMatch(/findPetsByStatus: build\.query/);
+    expect(api).toMatch(/providesTags: \["CustomProvide"\]/);
+    expect(api).toMatch(/invalidatesTags: \["CustomInvalidate"\]/);
+    expect(api).not.toMatch(/providesTags: \["pet"\]/);
+    expect(api).not.toMatch(/invalidatesTags: \["pet"\]/);
+  });
+
+  it('does not add override tags to addTagTypes when tag generation is disabled', async () => {
+    const api = await generateEndpoints({
+      unionUndefined: true,
+      apiFile: './fixtures/emptyApi.ts',
+      schemaFile: resolve(__dirname, 'fixtures/petstore.json'),
+      filterEndpoints: 'getPetById',
+      endpointOverrides: [
+        {
+          pattern: 'getPetById',
+          providesTags: ['CustomTag'],
+        },
+      ],
+    });
+
+    // The providesTags override should be present in the generated code
+    expect(api).toMatch(/providesTags: \["CustomTag"\]/);
+    // But addTagTypes should not be generated when tag: false (default)
+    expect(api).not.toContain('addTagTypes');
+  });
 });
 
 describe('option encodePathParams', () => {