Add an example for bun

.gitignore

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 # vscode
 .vscode
 
+# idea
+.idea
+

examples/bun/.gitignore

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+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Caches
+
+.cache
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+bun.lockb
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

examples/bun/README.md

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+# openapi-backend-bun
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.0.28. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

examples/bun/index.test.ts

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+import {$} from 'bun';
+import axios from 'axios';
+import type { AxiosInstance } from 'axios';
+import type { Subprocess } from 'bun';
+import {test, expect, describe, beforeAll, afterAll} from "bun:test";
+
+async function waitForPort(port: number, retryInterval = 1000, timeout = 30000) {
+  const start = Date.now();
+
+  while (true) {
+    try {
+      // Attempt to fetch from the server
+      await fetch(`http://localhost:${port}`);
+      // If successful, the port is open; break out of the loop
+      console.log(`Port ${port} is now open.`);
+      break;
+    } catch (e) {
+      // If there's an error (likely connection refused), the port isn't open yet
+      if (Date.now() - start > timeout) {
+        // If we've exceeded our timeout, throw an error
+        throw new Error(`Timeout waiting for port ${port}`);
+      }
+      // Wait for `retryInterval` milliseconds before trying again
+      await new Promise(resolve => setTimeout(resolve, retryInterval));
+    }
+  }
+}
+
+describe('bun-ts example', () => {
+  let proc: Subprocess<"ignore", "pipe", "inherit">;
+  let client: AxiosInstance;
+
+  beforeAll(async () => {
+    client = axios.create({ baseURL: 'http://localhost:9000', validateStatus: () => true  });
+    proc = Bun.spawn(["bun", "run", "index.ts"]);
+    proc.unref();
+
+    await waitForPort(9000);
+  });
+
+  afterAll(async () => {
+    proc.kill();
+  });
+
+  test('GET /pets returns 200 with matched operation', async () => {
+    const res = await client.get('/pets');
+    expect(res.status).toBe(200);
+    expect(res.data).toEqual({ operationId: 'getPets' });
+  });
+
+  test('GET /pets/1 returns 200 with matched operation', async () => {
+    const res = await client.get('/pets/1');
+    expect(res.status).toBe(200);
+    expect(res.data).toEqual({ operationId: 'getPetById' });
+  });
+
+  test('GET /pets/1a returns 400 with validation error', async () => {
+    const res = await client.get('/pets/1a');
+    expect(res.status).toBe(400);
+    expect(res.data).toHaveProperty('err');
+  });
+
+  test('GET /unknown returns 404', async () => {
+    const res = await client.get('/unknown');
+    expect(res.status).toBe(404);
+    expect(res.data).toHaveProperty('err');
+  });
+});

examples/bun/index.ts

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+import OpenAPIBackend from "openapi-backend";
+import {type Serve} from "bun";
+
+const api = new OpenAPIBackend({
+  definition: {
+    openapi: '3.0.1',
+    info: {
+      title: 'My API',
+      version: '1.0.0',
+    },
+    paths: {
+      '/pets': {
+        get: {
+          operationId: 'getPets',
+          responses: {
+            200: { description: 'ok' },
+          },
+        },
+      },
+      '/pets/{id}': {
+        get: {
+          operationId: 'getPetById',
+          responses: {
+            200: { description: 'ok' },
+          },
+        },
+        parameters: [
+          {
+            name: 'id',
+            in: 'path',
+            required: true,
+            schema: {
+              type: 'integer',
+            },
+          },
+        ],
+      },
+    },
+  },
+  handlers: {
+    getPets: async (c, req, res) => Response.json({ operationId: c.operation.operationId }),
+    getPetById: async (c, req, res) => Response.json({ operationId: c.operation.operationId }),
+    validationFail: async (c, req, res) => Response.json({ err: c.validation.errors }, {status: 400}),
+    notFound: async (c, req, res) => Response.json({ err: 'not found' }, {status: 404}),
+  },
+});
+
+api.init();
+
+export default {
+  port: 9000,
+  fetch(req) {
+    const {pathname, search} = new URL(req.url);
+
+    return api.handleRequest({
+      path: pathname,
+      query: search,
+      method: req.method,
+      headers: req.headers.toJSON(),
+      body: req.body
+    }, req, new Response(null, {status: 200}));
+  },
+} satisfies Serve;

examples/bun/package.json

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+{
+  "name": "openapi-backend-bun",
+  "module": "index.ts",
+  "type": "module",
+  "scripts": {
+    "dev": "bun run --watch index.ts"
+  },
+  "devDependencies": {
+    "@types/bun": "latest",
+    "@types/wait-on": "^5.3.4",
+    "axios": "^1.6.7",
+    "wait-on": "^7.2.0"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "openapi-backend": "^5.10.6"
+  }
+}

examples/bun/tsconfig.json

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+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext", "DOM"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}