add JSON Patch feature

__fixtures__/output/swagger.jsonpatch.diff

@@ -0,0 +1,24 @@
+JSON Patch Effect on IntOrString Type
+======================================
+
+The following diff shows how the JSON patch transforms the IntOrString type
+from a simple string type to a proper union type (string | number).
+
+- Without JSON Patch  - 1
++ With JSON Patch     + 1
+
+@@ -23,6 +23,6 @@
+    selector?: LabelSelector;
+    [key: string]: unknown;
+  };
+- export type IntOrString = string;
++ export type IntOrString = string | number;
+  export interface Info {
+    buildDate: string;
+
+Key Changes:
+- Original: export type IntOrString = string;
+- Patched:  export type IntOrString = string | number;
+
+This affects all properties that use IntOrString, making them accept both
+string and number values as originally intended by the Kubernetes API.

packages/schema-sdk/README.md

@@ -90,6 +90,54 @@ const code = generateOpenApiClient({
 writeFileSync(__dirname + '/output/swagger-client.ts', code);
 ```
 
+### Using JSON Patch to Modify OpenAPI Schemas
+
+The `jsonpatch` option allows you to apply RFC 6902 JSON Patch operations to the OpenAPI specification before processing. This is useful for fixing schema issues or making adjustments without modifying the source file.
+
+```ts
+import schema from 'path-to-your/swagger.json';
+import { generateOpenApiClient, getDefaultSchemaSDKOptions } from 'schema-sdk';
+import type { Operation } from 'fast-json-patch';
+
+// Example: Fix IntOrString type to be a proper union type
+const jsonPatchOperations: Operation[] = [
+  {
+    op: 'remove',
+    path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/type'
+  },
+  {
+    op: 'remove',
+    path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/format'
+  },
+  {
+    op: 'add',
+    path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/oneOf',
+    value: [
+      { type: 'string' },
+      { type: 'integer', format: 'int32' }
+    ]
+  }
+];
+
+const options = getDefaultSchemaSDKOptions({
+  clientName: 'KubernetesClient',
+  jsonpatch: jsonPatchOperations,
+  // ... other options
+});
+
+const code = generateOpenApiClient(options, schema);
+```
+
+The JSON Patch operations support all standard operations:
+- `add`: Add a new value
+- `remove`: Remove a value
+- `replace`: Replace an existing value
+- `move`: Move a value from one location to another
+- `copy`: Copy a value from one location to another
+- `test`: Test that a value equals a specified value
+
+For more information about JSON Patch format, see [RFC 6902](https://tools.ietf.org/html/rfc6902) and the [fast-json-patch documentation](https://www.npmjs.com/package/fast-json-patch).
+
 ## Contributing 🤝
 
 Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are **greatly appreciated**.

packages/schema-sdk/__tests__/jsonpatch.intorstring.test.ts

@@ -0,0 +1,50 @@
+import { readFileSync } from 'fs';
+import type { Operation } from 'fast-json-patch';
+import * as jsonpatch from 'fast-json-patch';
+
+import schema from '../../../__fixtures__/openapi/swagger.json';
+
+describe('IntOrString JSON Patch fix', () => {
+  it('should verify the original IntOrString is type string', () => {
+    const originalDef = (schema as any).definitions['io.k8s.apimachinery.pkg.util.intstr.IntOrString'];
+    expect(originalDef.type).toBe('string');
+    expect(originalDef.format).toBe('int-or-string');
+    expect(originalDef.oneOf).toBeUndefined();
+  });
+
+  it('should patch IntOrString to use oneOf', () => {
+    const jsonPatchOperations: Operation[] = [
+      {
+        op: 'remove',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/type'
+      },
+      {
+        op: 'remove',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/format'
+      },
+      {
+        op: 'add',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/oneOf',
+        value: [
+          { type: 'string' },
+          { type: 'integer', format: 'int32' }
+        ]
+      }
+    ];
+
+    // Apply patches
+    const schemaCopy = JSON.parse(JSON.stringify(schema));
+    const result = jsonpatch.applyPatch(schemaCopy, jsonPatchOperations);
+
+    const patchedDef = result.newDocument.definitions['io.k8s.apimachinery.pkg.util.intstr.IntOrString'];
+
+    // Verify the patch worked
+    expect(patchedDef.type).toBeUndefined();
+    expect(patchedDef.format).toBeUndefined();
+    expect(patchedDef.oneOf).toEqual([
+      { type: 'string' },
+      { type: 'integer', format: 'int32' }
+    ]);
+    expect(patchedDef.description).toBe('IntOrString is a type that can hold an int32 or a string.  When used in JSON or YAML marshalling and unmarshalling, it produces or consumes the inner type.  This allows you to have, for example, a JSON field that can accept a name or number.');
+  });
+});

packages/schema-sdk/__tests__/jsonpatch.test.ts

@@ -0,0 +1,132 @@
+import { writeFileSync } from 'fs';
+import type { Operation } from 'fast-json-patch';
+import { diff } from 'jest-diff';
+
+import schema from '../../../__fixtures__/openapi/swagger.json';
+import { generateOpenApiClient } from '../src/openapi';
+import { getDefaultSchemaSDKOptions } from '../src/types';
+
+describe('JSON Patch functionality', () => {
+  it('should patch IntOrString type from string to oneOf', () => {
+    // Define the patch to change IntOrString from type: string to oneOf: [string, integer]
+    const jsonPatchOperations: Operation[] = [
+      {
+        op: 'remove',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/type'
+      },
+      {
+        op: 'remove',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/format'
+      },
+      {
+        op: 'add',
+        path: '/definitions/io.k8s.apimachinery.pkg.util.intstr.IntOrString/oneOf',
+        value: [
+          { type: 'string' },
+          { type: 'integer', format: 'int32' }
+        ]
+      }
+    ];
+
+    const baseOptions = {
+      clientName: 'KubernetesClient',
+      exclude: [
+        '*.v1beta1.*',
+        '*.v2beta1.*',
+        'io.k8s.api.events.v1.EventSeries',
+        'io.k8s.api.events.v1.Event',
+        'io.k8s.api.flowcontrol*',
+      ],
+    };
+
+    // Generate code without patch
+    const optionsWithoutPatch = getDefaultSchemaSDKOptions(baseOptions);
+    const codeWithoutPatch = generateOpenApiClient(optionsWithoutPatch, schema as any);
+
+    // Generate code with patch
+    const optionsWithPatch = getDefaultSchemaSDKOptions({
+      ...baseOptions,
+      jsonpatch: jsonPatchOperations,
+    });
+    const codeWithPatch = generateOpenApiClient(optionsWithPatch, schema as any);
+
+    // The generated code should contain the IntOrString type as a union
+    expect(codeWithPatch).toContain('IntOrString');
+
+    // Extract just the IntOrString-related lines for a focused diff
+    const extractIntOrStringContext = (code: string) => {
+      const lines = code.split('\n');
+      const relevantLines: string[] = [];
+
+      lines.forEach((line, index) => {
+        if (line.includes('IntOrString')) {
+          // Get context: 2 lines before and after
+          for (let i = Math.max(0, index - 2); i <= Math.min(lines.length - 1, index + 2); i++) {
+            if (!relevantLines.includes(lines[i])) {
+              relevantLines.push(lines[i]);
+            }
+          }
+        }
+      });
+
+      return relevantLines.join('\n');
+    };
+
+    const contextWithoutPatch = extractIntOrStringContext(codeWithoutPatch);
+    const contextWithPatch = extractIntOrStringContext(codeWithPatch);
+
+    // Generate diff
+    const diffOutput = diff(contextWithoutPatch, contextWithPatch, {
+      aAnnotation: 'Without JSON Patch',
+      bAnnotation: 'With JSON Patch',
+      includeChangeCounts: true,
+      contextLines: 3,
+      expand: false,
+    });
+
+    // Write the diff for inspection
+    writeFileSync(
+      __dirname + '/../../../__fixtures__/output/swagger.jsonpatch.diff',
+      `JSON Patch Effect on IntOrString Type
+======================================
+
+The following diff shows how the JSON patch transforms the IntOrString type
+from a simple string type to a proper union type (string | number).
+
+${diffOutput}
+
+Key Changes:
+- Original: export type IntOrString = string;
+- Patched:  export type IntOrString = string | number;
+
+This affects all properties that use IntOrString, making them accept both
+string and number values as originally intended by the Kubernetes API.
+`
+    );
+
+    // Verify the type definition changed
+    expect(codeWithoutPatch).toMatch(/export type IntOrString = string;/);
+    expect(codeWithPatch).toMatch(/export type IntOrString = string \| number;/);
+  });
+
+  it('should handle empty jsonpatch array', () => {
+    const options = getDefaultSchemaSDKOptions({
+      clientName: 'KubernetesClient',
+      jsonpatch: [],
+      exclude: ['*.v1beta1.*', '*.v2beta1.*'],
+    });
+
+    const code = generateOpenApiClient(options, schema as any);
+    expect(code).toBeTruthy();
+  });
+
+  it('should handle undefined jsonpatch', () => {
+    const options = getDefaultSchemaSDKOptions({
+      clientName: 'KubernetesClient',
+      exclude: ['*.v1beta1.*', '*.v2beta1.*'],
+    });
+
+    const code = generateOpenApiClient(options, schema as any);
+    expect(code).toBeTruthy();
+  });
+});

packages/schema-sdk/package.json

@@ -34,6 +34,7 @@
     "@interweb-utils/casing": "^0.2.0",
     "@interweb/fetch-api-client": "^0.6.1",
     "deepmerge": "^4.3.1",
+    "fast-json-patch": "^3.1.1",
     "schema-typescript": "^0.12.1"
   },
   "keywords": [
@@ -42,5 +43,8 @@
     "typescript",
     "swagger",
     "openapi"
-  ]
+  ],
+  "devDependencies": {
+    "jest-diff": "^30.0.4"
+  }
 }

packages/schema-sdk/src/openapi.ts

@@ -12,7 +12,7 @@ import {
   Response,
 } from './openapi.types';
 import { OpenAPIOptions } from './types';
-import { createPathTemplateLiteral } from './utils';
+import { createPathTemplateLiteral, applyJsonPatch } from './utils';
 
 /**
 includes: {
@@ -575,11 +575,14 @@ export function generateOpenApiClient(
   options: OpenAPIOptions,
   schema: OpenAPISpec
 ): string {
+  // Apply JSON patches if configured
+  const patchedSchema = applyJsonPatch(schema, options);
+
   const methods = [];
   if (options.includeSwaggerUrl) {
     methods.push(getSwaggerJSONMethod());
   }
-  methods.push(...generateMethods(options, schema));
+  methods.push(...generateMethods(options, patchedSchema));
 
   const classBody = t.classBody([
     t.classMethod(
@@ -607,14 +610,14 @@ export function generateOpenApiClient(
   //// INTERFACES
   const apiSchema = {
     title: options.clientName,
-    definitions: schema.definitions,
+    definitions: patchedSchema.definitions,
   };
 
   const types = generateTypeScriptTypes(apiSchema, {
     ...(options as any),
     exclude: [options.clientName, ...(options.exclude ?? [])],
   });
-  const openApiTypes = generateOpenApiTypes(options, schema);
+  const openApiTypes = generateOpenApiTypes(options, patchedSchema);
 
   return generate(
     t.file(
@@ -921,7 +924,10 @@ export function generateReactQueryHooks(
   options: OpenAPIOptions,
   schema: OpenAPISpec
 ): string {
-  const components = collectReactQueryHookComponents(options, schema);
+  // Apply JSON patches if configured
+  const patchedSchema = applyJsonPatch(schema, options);
+
+  const components = collectReactQueryHookComponents(options, patchedSchema);
   if (!components.length) return ''
   // Group imports
   const importMap = new Map<string, Set<string>>();

packages/schema-sdk/src/types.ts

@@ -1,6 +1,7 @@
 import deepmerge from 'deepmerge';
 import type { DeepPartial } from 'schema-typescript';
 import { defaultSchemaTSOptions, SchemaTSOptions } from 'schema-typescript';
+import type { Operation } from 'fast-json-patch';
 
 export interface OpenAPIOptions extends SchemaTSOptions {
   clientName: string;
@@ -41,6 +42,12 @@ export interface OpenAPIOptions extends SchemaTSOptions {
 
     typesImportPath: string; // kubernetesjs, ./swagger-client, etc. 
   };
+  /**
+   * JSON Patch operations to apply to the OpenAPI spec before processing
+   * Uses RFC 6902 JSON Patch format
+   * @see https://www.npmjs.com/package/fast-json-patch
+   */
+  jsonpatch?: Operation[];
 }
 
 export const defaultSchemaSDKOptions: DeepPartial<OpenAPIOptions> = {
@@ -66,6 +73,7 @@ export const defaultSchemaSDKOptions: DeepPartial<OpenAPIOptions> = {
     typesImportPath: './client',
     contextHookName: './context'
   },
+  jsonpatch: [],
 };
 
 export const getDefaultSchemaSDKOptions = (