RFC: Response cache

.changeset/khaki-tires-roll.md

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+---
+'@hono/response-cache': minor
+---
+
+Initial Response Cache middleware implementation

packages/response-cache/README.md

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+# Response Cache for Hono
+Response cache for [Hono](https://honojs.dev) with `Bring Your Own` cache store.
+
+## Usage
+### Basic with `in-memory` cache:
+```ts
+import { Hono } from 'hono'
+import { cacheMiddleware } from '@hono/response-cache'
+
+const cacheStorage = new Map<string, string>()
+const cache = cacheMiddleware({
+  store: {
+    get: (key) => cacheStorage.get(key),
+    set: (key, value) => {
+      cacheStorage.set(key, value)
+    },
+    delete: (key) => {
+      cacheStorage.delete(key)
+    },
+  },
+})
+
+const app = new Hono()
+app.use('*', cache)
+```
+
+### Redis (and custom key function)
+```ts
+import { Hono } from 'hono'
+import { cacheMiddleware } from '@hono/response-cache'
+import { createClient } from '@redis/client'
+
+const redisClient = createClient({
+  url: `redis://${process.env.REDIS_HOST}:${process.env.REDIS_PORT}`,
+})
+
+const store = {
+  get: async (key: string) => {
+    return (await redisClient.get(key)) ?? null
+  },
+  set: async (key: string, value: string) => {
+    await redisClient.set(key, value)
+    return
+  },
+  invalidate: async (key: string) => {
+    await redisClient.del(key)
+    return
+  },
+}
+
+const cache = cacheMiddleware({
+  store,
+  keyFn: (req, c) => `hono_res_cache_${c.req.path}`,
+})
+
+app.use('*', cache)
+```
+
+### Add logging
+```ts
+import { cacheMiddleware } from '@hono/response-cache'
+
+const cache = cacheMiddleware({
+  store,
+  logging: {
+    enabled: true,
+    onHit: (key, c) => console.log(`Cache hit for ${key}`),
+    onMiss: (key, c) => console.log(`Cache miss for ${key}`),
+    onError: (key, c) => console.log(`Cache error for ${key}, error:`, error),
+  },
+})
+```
+
+## Author
+
+Rokas Muningis <https://github.com/muningis>
+
+## License
+
+MIT

packages/response-cache/package.json

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+{
+  "name": "@hono/response-cache",
+  "version": "0.0.0",
+  "description": "Response cache for Hono",
+  "type": "module",
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "test": "tsc --noEmit && vitest --run",
+    "build": "tsc",
+    "publint": "publint",
+    "prerelease": "yarn build && yarn test",
+    "release": "yarn publish"
+  },
+  "license": "MIT",
+  "publishConfig": {
+    "registry": "https://registry.npmjs.org",
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/honojs/middleware.git"
+  },
+  "homepage": "https://github.com/honojs/middleware",
+  "peerDependencies": {
+    "hono": ">=4.7.0"
+  },
+  "dependencies": {
+    "hono": "^4.10.1"
+  },
+  "devDependencies": {
+    "publint": "^0.2.7",
+    "tsup": "^8.1.0",
+    "typescript": "^5.8.2",
+    "vitest": "^2.0.0"
+  }
+}