Merge pull request #1 from juherr/feat/add-eslint-lint-staged

feat: add ESLint, lint-staged, and update pre-commit hook + CI

.github/workflows/ci.yml

@@ -21,7 +21,10 @@ jobs:
       - run: npm ci
 
       - name: Format check
-        run: npx prettier --check '**/*.{js,ts,css,json,md}'
+        run: npm run format:check
+
+      - name: Lint
+        run: npm run lint
 
       - name: Type check
         run: npm run typecheck

.husky/pre-commit

@@ -0,0 +1,2 @@
+#!/bin/sh
+npx lint-staged && npm run typecheck && npm test

README.md

@@ -31,7 +31,7 @@ Email-to-RSS keeps the same workflow while avoiding shared domains and shared da
 Two ingestion methods are supported — pick one or use both:
 
 | Method                       | How it works                                                                                                                         |
-| ---------------------- | ------------------------------------------------------------------ |
+| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
 | **Cloudflare Email Workers** | Cloudflare Email Routing delivers the raw message directly to the Worker via the `email()` handler — no outbound webhook needed      |
 | **ForwardEmail webhook**     | ForwardEmail parses the message and POSTs a JSON payload to `POST /api/inbound`; the Worker verifies the source IP before processing |
 
@@ -60,7 +60,7 @@ Main routes:
 
 ## Cloudflare setup
 
-If your domain is not yet on Cloudflare: in the [Cloudflare dashboard](https://dash.cloudflare.com/), go to *Add a site*, enter your domain, choose the Free plan, and follow the instructions to update your nameservers at your registrar. Wait for the zone to become active (usually a few minutes).
+If your domain is not yet on Cloudflare: in the [Cloudflare dashboard](https://dash.cloudflare.com/), go to _Add a site_, enter your domain, choose the Free plan, and follow the instructions to update your nameservers at your registrar. Wait for the zone to become active (usually a few minutes).
 
 ## Setup
 
@@ -70,9 +70,11 @@ If your domain is not yet on Cloudflare: in the [Cloudflare dashboard](https://d
    npx wrangler login
    ```
 3. Run setup:
+
    ```bash
    bash setup.sh
    ```
+
    The script will prompt for an admin password and your domain, then:
    - install npm dependencies
    - verify Cloudflare auth (`wrangler whoami`)
@@ -86,8 +88,8 @@ If your domain is not yet on Cloudflare: in the [Cloudflare dashboard](https://d
 
 No third-party service required. Cloudflare receives the email and hands it directly to the Worker.
 
-1. In the Cloudflare dashboard, go to *Email → Email Routing* for your zone and click **Enable Email Routing**. Cloudflare will prompt you to add MX and SPF records — accept and it adds them automatically.
+1. In the Cloudflare dashboard, go to _Email → Email Routing_ for your zone and click **Enable Email Routing**. Cloudflare will prompt you to add MX and SPF records — accept and it adds them automatically.
-2. Under *Email Routing → Routing Rules*, add a **Catch-all** rule:
+2. Under _Email Routing → Routing Rules_, add a **Catch-all** rule:
    - Action: **Send to Worker**
    - Worker: `email-to-rss` (the name from `wrangler.toml`)
 
@@ -97,7 +99,7 @@ That's it. No webhook configuration is needed.
 
 Use this if you prefer ForwardEmail's additional features (sender filtering, open-tracking, etc.).
 
-Add these DNS records in Cloudflare (*DNS → Records*):
+Add these DNS records in Cloudflare (_DNS → Records_):
 
 | Type | Name | Content                                              | Notes                   |
 | ---- | ---- | ---------------------------------------------------- | ----------------------- |
@@ -111,14 +113,16 @@ Replace `yourdomain.com` with your actual domain.
 The Worker verifies each webhook request against ForwardEmail's published MX IP list before processing it.
 
 5. Deploy:
+
    ```bash
    npm run deploy
    ```
+
    Wrangler will create the Worker and register `yourdomain.com` (and `www.yourdomain.com`) as custom domains pointing to it. Cloudflare handles TLS automatically.
 
 6. Open `https://yourdomain.com/admin` and sign in.
 
-> **Tip:** To verify the Worker is running, check *Workers & Pages → email-to-rss* in the Cloudflare dashboard. The *Custom Domains* tab should list your domain once the deploy succeeds.
+> **Tip:** To verify the Worker is running, check _Workers & Pages → email-to-rss_ in the Cloudflare dashboard. The _Custom Domains_ tab should list your domain once the deploy succeeds.
 
 ## Development
 
@@ -153,7 +157,7 @@ This feature is **optional**. If no R2 bucket is bound, attachments are silently
 
 **Setup:**
 
-1. Create an R2 bucket in the Cloudflare dashboard (*R2 Object Storage → Create bucket*), or with Wrangler:
+1. Create an R2 bucket in the Cloudflare dashboard (_R2 Object Storage → Create bucket_), or with Wrangler:
    ```bash
    npx wrangler r2 bucket create your-bucket-name
    ```
@@ -178,7 +182,7 @@ Instead of the built-in password login you can delegate admin authentication to
 **Required Worker secrets** (set with `wrangler secret put`, never in `[vars]`):
 
 | Secret              | Description                                    |
-|---|---|
+| ------------------- | ---------------------------------------------- |
 | `PROXY_AUTH_SECRET` | Shared secret between the proxy and the Worker |
 
 **Required `[vars]`** in `wrangler.toml`:
@@ -188,6 +192,7 @@ PROXY_TRUSTED_IPS = "10.0.0.1"   # comma-separated IPs of your reverse proxy
 ```
 
 When both are configured, the Worker authenticates a request if:
+
 1. `CF-Connecting-IP` is in `PROXY_TRUSTED_IPS`
 2. The `X-Auth-Proxy-Secret` header matches `PROXY_AUTH_SECRET`
 3. `Remote-User` or `X-Forwarded-User` is non-empty

eslint.config.mjs

@@ -0,0 +1,22 @@
+import prettier from "eslint-config-prettier";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  { ignores: ["dist/", "coverage/"] },
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        { argsIgnorePattern: "^_", varsIgnorePattern: "^_" },
+      ],
+    },
+  },
+  {
+    files: ["src/**/*.test.ts", "src/test/**/*.ts"],
+    rules: {
+      "@typescript-eslint/no-explicit-any": "off",
+    },
+  },
+);

package.json

@@ -6,12 +6,24 @@
   "scripts": {
     "build": "wrangler deploy --dry-run --outdir=dist",
     "format": "prettier --write '**/*.{js,ts,css,json,md}'",
+    "format:check": "prettier --check '**/*.{js,ts,css,json,md}'",
+    "lint": "eslint src",
     "dev": "wrangler dev",
     "deploy": "wrangler deploy --env production",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "prepare": "husky"
+  },
+  "lint-staged": {
+    "*.{ts,js}": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "*.{json,md,css}": [
+      "prettier --write"
+    ]
   },
   "author": "",
   "license": "MIT",
@@ -20,10 +32,15 @@
     "@types/mailparser": "^3.4.6",
     "@types/rss": "^0.0.32",
     "@vitest/coverage-v8": "^4.0.18",
+    "eslint": "^10.0.0",
+    "eslint-config-prettier": "^10.1.8",
     "happy-dom": "^20.5.0",
+    "husky": "^9.1.7",
+    "lint-staged": "^17.0.5",
     "msw": "^2.12.8",
     "prettier": "^3.8.1",
     "typescript": "^5.9.3",
+    "typescript-eslint": "^8.59.4",
     "vitest": "^4.0.18",
     "wrangler": "^4.63.0"
   },

src/lib/cloudflare-email.ts

@@ -5,7 +5,7 @@ import { processEmail, RawAttachment } from "./email-processor";
 export async function handleCloudflareEmail(
   message: ForwardableEmailMessage,
   env: Env,
-  ctx: ExecutionContext,
+  _ctx: ExecutionContext,
 ): Promise<void> {
   try {
     const email = await PostalMime.parse(message.raw);

src/lib/email-processor.test.ts

@@ -1,7 +1,11 @@
 import { describe, it, expect, beforeEach } from "vitest";
 import "../test/setup";
 import { createMockEnv, MockR2 } from "../test/setup";
-import { processEmail, ProcessEmailInput, RawAttachment } from "./email-processor";
+import {
+  processEmail,
+  ProcessEmailInput,
+  RawAttachment,
+} from "./email-processor";
 
 const VALID_FEED_ID = "apple.mountain.42";
 const VALID_TO = `${VALID_FEED_ID}@test.getmynews.app`;
@@ -139,25 +143,53 @@ describe("processEmail", () => {
     const oldKey1 = `feed:${VALID_FEED_ID}:111`;
     const oldKey2 = `feed:${VALID_FEED_ID}:222`;
     const bigContent = "x".repeat(200);
-    const email1 = JSON.stringify({ subject: "Old1", from: "[email protected]", content: bigContent, receivedAt: 111, headers: {} });
+    const email1 = JSON.stringify({
-    const email2 = JSON.stringify({ subject: "Old2", from: "[email protected]", content: bigContent, receivedAt: 222, headers: {} });
+      subject: "Old1",
+      from: "[email protected]",
+      content: bigContent,
+      receivedAt: 111,
+      headers: {},
+    });
+    const email2 = JSON.stringify({
+      subject: "Old2",
+      from: "[email protected]",
+      content: bigContent,
+      receivedAt: 222,
+      headers: {},
+    });
     await env.EMAIL_STORAGE.put(oldKey1, email1);
     await env.EMAIL_STORAGE.put(oldKey2, email2);
     await env.EMAIL_STORAGE.put(
       `feed:${VALID_FEED_ID}:metadata`,
       JSON.stringify({
         emails: [
-          { key: oldKey2, subject: "Old2", receivedAt: 222, size: email2.length },
+          {
-          { key: oldKey1, subject: "Old1", receivedAt: 111, size: email1.length },
+            key: oldKey2,
+            subject: "Old2",
+            receivedAt: 222,
+            size: email2.length,
+          },
+          {
+            key: oldKey1,
+            subject: "Old1",
+            receivedAt: 111,
+            size: email1.length,
+          },
         ],
       }),
     );
 
     const tinyEnv = { ...env, FEED_MAX_SIZE_BYTES: "50" };
-    const res = await processEmail(makeInput({ subject: "New" }), tinyEnv as any);
+    const res = await processEmail(
+      makeInput({ subject: "New" }),
+      tinyEnv as any,
+    );
     expect(res.status).toBe(200);
 
-    const metadata = await env.EMAIL_STORAGE.get(`feed:${VALID_FEED_ID}:metadata`, "json");
+    const metadata = await env.EMAIL_STORAGE.get(
+      `feed:${VALID_FEED_ID}:metadata`,
+      "json",
+    );
     expect(metadata.emails).toHaveLength(1);
     expect(metadata.emails[0].subject).toBe("New");
 
@@ -175,13 +207,17 @@ describe("processEmail", () => {
     const bigEnv = { ...env, FEED_MAX_SIZE_BYTES: String(10 * 1024 * 1024) };
     await processEmail(makeInput({ subject: "First" }), bigEnv as any);
     await processEmail(makeInput({ subject: "Second" }), bigEnv as any);
-    const metadata = await env.EMAIL_STORAGE.get(`feed:${VALID_FEED_ID}:metadata`, "json");
+    const metadata = await env.EMAIL_STORAGE.get(
+      `feed:${VALID_FEED_ID}:metadata`,
+      "json",
+    );
     expect(metadata.emails).toHaveLength(2);
   });
 });
 
 describe("processEmail — attachments", () => {
-  const pdfContent = new TextEncoder().encode("PDF bytes").buffer as ArrayBuffer;
+  const pdfContent = new TextEncoder().encode("PDF bytes")
+    .buffer as ArrayBuffer;
 
   const pdfAttachment: RawAttachment = {
     filename: "report.pdf",
@@ -205,7 +241,10 @@ describe("processEmail — attachments", () => {
       `feed:${VALID_FEED_ID}:metadata`,
       "json",
     );
-    const emailData = await env.EMAIL_STORAGE.get(metadata.emails[0].key, "json");
+    const emailData = await env.EMAIL_STORAGE.get(
+      metadata.emails[0].key,
+      "json",
+    );
     expect(emailData.attachments).toBeUndefined();
   });
 
@@ -226,7 +265,10 @@ describe("processEmail — attachments", () => {
       `feed:${VALID_FEED_ID}:metadata`,
       "json",
     );
-    const emailData = await env.EMAIL_STORAGE.get(metadata.emails[0].key, "json");
+    const emailData = await env.EMAIL_STORAGE.get(
+      metadata.emails[0].key,
+      "json",
+    );
 
     expect(emailData.attachments).toHaveLength(1);
     expect(emailData.attachments[0].filename).toBe("report.pdf");
@@ -271,7 +313,14 @@ describe("processEmail — attachments", () => {
       content: bigContent,
       receivedAt: 111,
       headers: {},
-      attachments: [{ id: oldAttachmentId, filename: "old.pdf", contentType: "application/pdf", size: 100 }],
+      attachments: [
+        {
+          id: oldAttachmentId,
+          filename: "old.pdf",
+          contentType: "application/pdf",
+          size: 100,
+        },
+      ],
     });
     await env.EMAIL_STORAGE.put(oldKey, oldEmail);
 
@@ -295,7 +344,10 @@ describe("processEmail — attachments", () => {
 
     // Process with tight size budget to force trimming
     const tinyEnv = { ...env, FEED_MAX_SIZE_BYTES: "50" };
-    const res = await processEmail(makeInput({ subject: "New" }), tinyEnv as any);
+    const res = await processEmail(
+      makeInput({ subject: "New" }),
+      tinyEnv as any,
+    );
     expect(res.status).toBe(200);
 
     // Old attachment should be deleted from R2

src/lib/email-processor.ts

@@ -1,5 +1,11 @@
 import { EmailParser } from "../utils/email-parser";
-import { AttachmentData, EmailMetadata, Env, FeedConfig, FeedMetadata } from "../types";
+import {
+  AttachmentData,
+  EmailMetadata,
+  Env,
+  FeedConfig,
+  FeedMetadata,
+} from "../types";
 
 export interface RawAttachment {
   filename: string;
@@ -151,7 +157,10 @@ export async function processEmail(
   };
   feedMetadata.emails.unshift(newEntry);
 
-  let totalSize = feedMetadata.emails.reduce((sum, e) => sum + (e.size ?? 0), 0);
+  let totalSize = feedMetadata.emails.reduce(
+    (sum, e) => sum + (e.size ?? 0),
+    0,
+  );
   const toDelete: EmailMetadata[] = [];
   while (totalSize > maxBytes && feedMetadata.emails.length > 1) {
     const dropped = feedMetadata.emails.pop()!;

src/lib/forwardemail.ts

@@ -6,10 +6,7 @@ export interface ForwardEmailAttachment {
   filename?: string;
   contentType?: string;
   size?: number;
-  content?:
+  content?: { type: "Buffer"; data: number[] } | ArrayBuffer | ArrayBufferView;
-    | { type: "Buffer"; data: number[] }
-    | ArrayBuffer
-    | ArrayBufferView;
 }
 
 export interface ForwardEmailPayload {
@@ -56,8 +53,13 @@ function toArrayBuffer(
 ): ArrayBuffer | null {
   if (!content) return null;
   if (content instanceof ArrayBuffer) return content;
-  if (ArrayBuffer.isView(content)) return (content as ArrayBufferView).buffer as ArrayBuffer;
+  if (ArrayBuffer.isView(content))
-  if (typeof content === "object" && content.type === "Buffer" && Array.isArray(content.data)) {
+    return (content as ArrayBufferView).buffer as ArrayBuffer;
+  if (
+    typeof content === "object" &&
+    content.type === "Buffer" &&
+    Array.isArray(content.data)
+  ) {
     return Uint8Array.from(content.data).buffer as ArrayBuffer;
   }
   return null;

src/routes/admin.test.ts

@@ -14,7 +14,8 @@ describe("Admin Routes", () => {
     mockEnv = createMockEnv() as unknown as Env;
     testApp = new Hono();
     testApp.route("/admin", app);
-    request = (path, init = {}) => Promise.resolve(testApp.request(path, init, mockEnv));
+    request = (path, init = {}) =>
+      Promise.resolve(testApp.request(path, init, mockEnv));
     loginAndGetCookie = async () => {
       const formData = new FormData();
       formData.append("password", "test-password");
@@ -366,7 +367,10 @@ describe("Admin Routes", () => {
         } as unknown as Env;
       }
 
-      function makeProxyRequest(path: string, headers: Record<string, string> = {}) {
+      function makeProxyRequest(
+        path: string,
+        headers: Record<string, string> = {},
+      ) {
         const proxyApp = new Hono();
         proxyApp.route("/admin", app);
         return proxyApp.request(path, { headers }, proxyEnv());

src/routes/admin.ts

@@ -71,9 +71,11 @@ function timingSafeEqual(a: string, b: string): boolean {
   const aBytes = enc.encode(a);
   const bBytes = enc.encode(b);
   // Try native timing-safe implementation first (Cloudflare Workers runtime)
-  if (typeof (crypto.subtle as any).timingSafeEqual === "function") {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const subtle = crypto.subtle as any;
+  if (typeof subtle.timingSafeEqual === "function") {
     if (aBytes.length !== bBytes.length) return false;
-    return (crypto.subtle as any).timingSafeEqual(aBytes, bBytes);
+    return subtle.timingSafeEqual(aBytes, bBytes);
   }
   // Constant-time fallback for Node (test environment): encode length
   // mismatch into `diff` so the loop always runs over the full length.
@@ -97,7 +99,9 @@ async function authMiddleware(c: Context, next: () => Promise<void>) {
 
   // Proxy auth: only active when both env vars are present
   if (env.PROXY_AUTH_SECRET && env.PROXY_TRUSTED_IPS) {
-    const trustedIps = env.PROXY_TRUSTED_IPS.split(",").map((s) => s.trim()).filter(Boolean);
+    const trustedIps = env.PROXY_TRUSTED_IPS.split(",")
+      .map((s) => s.trim())
+      .filter(Boolean);
     const clientIp = c.req.header("CF-Connecting-IP") ?? "";
     const providedSecret = c.req.header("X-Auth-Proxy-Secret") ?? "";
     const remoteUser =
@@ -113,7 +117,11 @@ async function authMiddleware(c: Context, next: () => Promise<void>) {
   }
 
   // Fallback: signed cookie
-  const authCookie = await getSignedCookie(c, env.ADMIN_PASSWORD, ADMIN_COOKIE_NAME);
+  const authCookie = await getSignedCookie(
+    c,
+    env.ADMIN_PASSWORD,
+    ADMIN_COOKIE_NAME,
+  );
   if (authCookie !== "1") {
     return c.redirect("/admin/login");
   }
@@ -146,6 +154,7 @@ const authSchema = z.object({
 });
 
 // Base HTML layout with design system
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 const layout = (title: string, content: any) => {
   return html`<!DOCTYPE html>
     <html>
@@ -1610,11 +1619,14 @@ app.post("/feeds/create", async (c) => {
     if (isJson) {
       const body = await c.req.json<Record<string, unknown>>();
       title = String(body.title ?? "");
-      description = body.description != null ? String(body.description) : undefined;
+      description =
+        body.description != null ? String(body.description) : undefined;
       language = String(body.language ?? "en");
       view = "list";
       allowedSenders = Array.isArray(body.allowedSenders)
-        ? normalizeAllowedSenders((body.allowedSenders as unknown[]).map(String))
+        ? normalizeAllowedSenders(
+            (body.allowedSenders as unknown[]).map(String),
+          )
         : [];
     } else {
       const formData = await c.req.formData();
@@ -1930,7 +1942,8 @@ async function purgeFeedKeysStep(
     });
     if (emailKeys.length > 0) {
       const emailDataResults = await Promise.allSettled(
-        emailKeys.map((k) =>
+        emailKeys.map(
+          (k) =>
             emailStorage.get(k, { type: "json" }) as Promise<EmailData | null>,
         ),
       );
@@ -1976,7 +1989,12 @@ app.post("/feeds/:feedId/delete", async (c) => {
 
     // Best-effort cleanup in the background so the request stays fast.
     // Use the UI purge endpoint for full, user-visible progress.
-    waitUntilSafe(c, purgeFeedKeysStep(emailStorage, feedId, { bucket: env.ATTACHMENT_BUCKET }));
+    waitUntilSafe(
+      c,
+      purgeFeedKeysStep(emailStorage, feedId, {
+        bucket: env.ATTACHMENT_BUCKET,
+      }),
+    );
     if (wantsJson) {
       return c.json({ ok: true, feedId });
     }

src/routes/atom.test.ts

@@ -68,7 +68,11 @@ describe("Atom Feed Route", () => {
         `feed:${FEED_ID}:metadata`,
         JSON.stringify({
           emails: [
-            { key: emailKey, subject: "Atom Entry Subject", receivedAt: 1700000001000 },
+            {
+              key: emailKey,
+              subject: "Atom Entry Subject",
+              receivedAt: 1700000001000,
+            },
           ],
         }),
       );

src/routes/entries.ts

@@ -21,7 +21,9 @@ export async function handle(c: Context): Promise<Response> {
     return new Response("Feed not found", { status: 404 });
   }
 
-  const metaEntry = feedMetadata.emails.find((e) => e.receivedAt === receivedAt);
+  const metaEntry = feedMetadata.emails.find(
+    (e) => e.receivedAt === receivedAt,
+  );
   if (!metaEntry) {
     return new Response("Entry not found", { status: 404 });
   }
@@ -39,26 +41,50 @@ export async function handle(c: Context): Promise<Response> {
     "default-src 'none'; style-src 'unsafe-inline'; img-src *; frame-src 'none'",
   );
 
-  return c.html(html`<!DOCTYPE html>
+  return c.html(
+    html`<!DOCTYPE html>
       <html>
         <head>
-  <meta charset="UTF-8">
+          <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+          <meta
+            name="viewport"
+            content="width=device-width, initial-scale=1.0"
+          />
           <title>${emailData.subject}</title>
           <style>
-    body { font-family: sans-serif; max-width: 800px; margin: 0 auto; padding: 1rem; }
+            body {
-    .meta { color: #666; font-size: 0.875rem; margin-bottom: 1.5rem; border-bottom: 1px solid #eee; padding-bottom: 0.75rem; }
+              font-family: sans-serif;
-    .meta dt { display: inline; font-weight: bold; }
+              max-width: 800px;
-    .meta dd { display: inline; margin: 0 1rem 0 0.25rem; }
+              margin: 0 auto;
+              padding: 1rem;
+            }
+            .meta {
+              color: #666;
+              font-size: 0.875rem;
+              margin-bottom: 1.5rem;
+              border-bottom: 1px solid #eee;
+              padding-bottom: 0.75rem;
+            }
+            .meta dt {
+              display: inline;
+              font-weight: bold;
+            }
+            .meta dd {
+              display: inline;
+              margin: 0 1rem 0 0.25rem;
+            }
           </style>
         </head>
         <body>
           <h1>${emailData.subject}</h1>
           <dl class="meta">
-    <dt>From:</dt><dd>${emailData.from}</dd>
+            <dt>From:</dt>
-    <dt>Date:</dt><dd>${new Date(emailData.receivedAt).toUTCString()}</dd>
+            <dd>${emailData.from}</dd>
+            <dt>Date:</dt>
+            <dd>${new Date(emailData.receivedAt).toUTCString()}</dd>
           </dl>
           <div class="content">${raw(emailData.content)}</div>
         </body>
-</html>`);
+      </html>`,
+  );
 }

src/routes/files.test.ts

@@ -39,7 +39,8 @@ describe("GET /files/:attachmentId/:filename", () => {
   });
 
   it("returns 200 with stored content when attachment exists", async () => {
-    const content = new TextEncoder().encode("PDF content").buffer as ArrayBuffer;
+    const content = new TextEncoder().encode("PDF content")
+      .buffer as ArrayBuffer;
     await mockR2.put("test-uuid", content, {
       httpMetadata: { contentType: "application/pdf" },
     });

src/routes/inbound.ts

@@ -1,9 +1,6 @@
 import { Context } from "hono";
 import { Env } from "../types";
-import {
+import { ForwardEmailPayload, handleForwardEmail } from "../lib/forwardemail";
-  ForwardEmailPayload,
-  handleForwardEmail,
-} from "../lib/forwardemail";
 
 export async function handle(c: Context): Promise<Response> {
   try {

src/test/setup.ts

@@ -71,7 +71,7 @@ class MockCache implements Cache {
 
   async match(
     request: RequestInfo,
-    options?: CacheQueryOptions,
+    _options?: CacheQueryOptions,
   ): Promise<Response | undefined> {
     const key = request instanceof Request ? request.url : request;
     const response = this.store.get(key);
@@ -80,7 +80,7 @@ class MockCache implements Cache {
 
   async delete(
     request: RequestInfo,
-    options?: CacheQueryOptions,
+    _options?: CacheQueryOptions,
   ): Promise<boolean> {
     const key = request instanceof Request ? request.url : request;
     return this.store.delete(key);
@@ -107,7 +107,6 @@ beforeAll(() => {
   server.listen({ onUnhandledRequest: "error" });
 
   // Type-safe access to Node's global object for setting Workers-like globals in tests
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const g = globalThis as any;
 
   // Mock Cloudflare Workers runtime globals
@@ -118,31 +117,26 @@ beforeAll(() => {
 
   // Mock crypto for generating random values
   if (!g.crypto) {
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
     g.crypto = require("crypto").webcrypto;
   }
 
   // Ensure other required globals are available
   if (!g.FormData) {
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
     const { FormData } = require("undici");
     g.FormData = FormData;
   }
 
   if (!g.Headers) {
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
     const { Headers } = require("undici");
     g.Headers = Headers;
   }
 
   if (!g.Request) {
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
     const { Request } = require("undici");
     g.Request = Request;
   }
 
   if (!g.Response) {
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
     const { Response } = require("undici");
     g.Response = Response;
   }
@@ -173,7 +167,13 @@ export class MockR2 {
 
   async put(
     key: string,
-    value: ReadableStream | ArrayBuffer | ArrayBufferView | string | null | Blob,
+    value:
+      | ReadableStream
+      | ArrayBuffer
+      | ArrayBufferView
+      | string
+      | null
+      | Blob,
     options?: {
       httpMetadata?: { contentType?: string; contentDisposition?: string };
     },
@@ -216,7 +216,10 @@ export class MockR2 {
           headers.set("Content-Type", entry.httpMetadata.contentType);
         }
         if (entry.httpMetadata?.contentDisposition) {
-          headers.set("Content-Disposition", entry.httpMetadata.contentDisposition);
+          headers.set(
+            "Content-Disposition",
+            entry.httpMetadata.contentDisposition,
+          );
         }
       },
     };

src/types/index.ts

@@ -71,7 +71,7 @@ declare global {
   // This is not an ideal solution but works for our example
   interface KVNamespace {
     get(key: string, options?: { type: "text" }): Promise<string | null>;
-    get(key: string, options: { type: "json" }): Promise<any | null>;
+    get(key: string, options: { type: "json" }): Promise<unknown | null>;
     get(
       key: string,
       options: { type: "arrayBuffer" },

src/types/rss.d.ts

@@ -15,7 +15,7 @@ declare module "rss" {
     generator?: string;
     categories?: string[];
     custom_namespaces?: Record<string, string>;
-    custom_elements?: any[];
+    custom_elements?: unknown[];
   }
 
   interface RSSItemOptions {
@@ -34,7 +34,7 @@ declare module "rss" {
       size?: number;
       type?: string;
     };
-    custom_elements?: any[];
+    custom_elements?: unknown[];
   }
 
   interface RSSXMLOptions {

src/utils/email-parser.test.ts

@@ -53,15 +53,15 @@ describe("EmailParser.decodeEncodedWords", () => {
     // =?UTF-8?Q?caf=C3=A9?= → "café" (but decodeQuotedPrintable works byte-by-byte)
     // Use a simple ASCII QP sequence to stay charset-agnostic in tests
     // =?US-ASCII?Q?Hello=20World?= → "Hello World" (=20 → space, _ → space)
-    expect(
+    expect(EmailParser.decodeEncodedWords("=?US-ASCII?Q?Hello=20World?=")).toBe(
-      EmailParser.decodeEncodedWords("=?US-ASCII?Q?Hello=20World?="),
+      "Hello World",
-    ).toBe("Hello World");
+    );
   });
 
   it("decodes underscores as spaces in QP encoding", () => {
-    expect(
+    expect(EmailParser.decodeEncodedWords("=?US-ASCII?Q?Hello_World?=")).toBe(
-      EmailParser.decodeEncodedWords("=?US-ASCII?Q?Hello_World?="),
+      "Hello World",
-    ).toBe("Hello World");
+    );
   });
 
   it("leaves unrecognised encoded-word syntax unchanged", () => {
@@ -79,9 +79,7 @@ describe("EmailParser.parseForwardEmailPayload", () => {
   });
 
   it("throws on undefined payload", () => {
-    expect(() =>
+    expect(() => EmailParser.parseForwardEmailPayload(undefined)).toThrow();
-      EmailParser.parseForwardEmailPayload(undefined),
-    ).toThrow();
   });
 
   it("parses subject, from, and HTML content", () => {
@@ -95,7 +93,9 @@ describe("EmailParser.parseForwardEmailPayload", () => {
     expect(result.subject).toBe("Test Subject");
     expect(result.from).toBe("[email protected]");
     expect(result.content).toBe("<p>Hello</p>");
-    expect(result.receivedAt).toBe(new Date("2024-01-15T10:00:00.000Z").getTime());
+    expect(result.receivedAt).toBe(
+      new Date("2024-01-15T10:00:00.000Z").getTime(),
+    );
   });
 
   it("prefers HTML content over plain text", () => {
@@ -137,14 +137,18 @@ describe("EmailParser.parseForwardEmailPayload", () => {
 
   it("uses Date.now() when date field is absent", () => {
     const before = Date.now();
-    const result = EmailParser.parseForwardEmailPayload({ from: { text: "[email protected]" } });
+    const result = EmailParser.parseForwardEmailPayload({
+      from: { text: "[email protected]" },
+    });
     const after = Date.now();
     expect(result.receivedAt).toBeGreaterThanOrEqual(before);
     expect(result.receivedAt).toBeLessThanOrEqual(after);
   });
 
   it("defaults subject to 'No Subject' when absent", () => {
-    const result = EmailParser.parseForwardEmailPayload({ from: { text: "[email protected]" } });
+    const result = EmailParser.parseForwardEmailPayload({
+      from: { text: "[email protected]" },
+    });
     expect(result.subject).toBe("No Subject");
   });
 

src/utils/email-parser.ts

@@ -7,6 +7,7 @@ export class EmailParser {
     return match ? match[1] : null;
   }
 
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   static parseForwardEmailPayload(payload: any): EmailData {
     if (!payload) {
       throw new Error("Missing or invalid webhook payload");
@@ -30,6 +31,7 @@ export class EmailParser {
     };
   }
 
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   private static extractHeaders(payload: any): Record<string, string> {
     const headers: Record<string, string> = {};
 
@@ -62,7 +64,7 @@ export class EmailParser {
         if (encoding.toUpperCase() === "B") {
           try {
             return atob(text);
-          } catch (e) {
+          } catch {
             return text;
           }
         } else if (encoding.toUpperCase() === "Q") {

src/utils/feed-generator.test.ts

@@ -38,13 +38,23 @@ const FEED_ID = "abc123";
 
 describe("generateRssFeed", () => {
   it("returns RSS 2.0 with channel element", () => {
-    const result = generateRssFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateRssFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("<channel>");
     expect(result).toContain("<title>Test Newsletter</title>");
   });
 
   it("includes <enclosure> element for email with attachment", () => {
-    const result = generateRssFeed(mockFeedConfig, [mockEmailWithAttachment], BASE_URL, FEED_ID);
+    const result = generateRssFeed(
+      mockFeedConfig,
+      [mockEmailWithAttachment],
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("<enclosure");
     expect(result).toContain("550e8400-e29b-41d4-a716-446655440000");
     expect(result).toContain("report.pdf");
@@ -53,22 +63,44 @@ describe("generateRssFeed", () => {
   });
 
   it("does not include <enclosure> for email without attachments", () => {
-    const result = generateRssFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateRssFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).not.toContain("<enclosure");
   });
 
   it("enclosure URL uses /files/{id}/{filename} scheme", () => {
-    const result = generateRssFeed(mockFeedConfig, [mockEmailWithAttachment], BASE_URL, FEED_ID);
+    const result = generateRssFeed(
-    expect(result).toContain(`${BASE_URL}/files/550e8400-e29b-41d4-a716-446655440000/report.pdf`);
+      mockFeedConfig,
+      [mockEmailWithAttachment],
+      BASE_URL,
+      FEED_ID,
+    );
+    expect(result).toContain(
+      `${BASE_URL}/files/550e8400-e29b-41d4-a716-446655440000/report.pdf`,
+    );
   });
 
   it("includes rss self-link in RSS output", () => {
-    const result = generateRssFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateRssFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain(`${BASE_URL}/rss/${FEED_ID}`);
   });
 
   it("includes email entries as <item> elements", () => {
-    const result = generateRssFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateRssFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("<item>");
     expect(result).toContain("Hello World");
   });
@@ -82,39 +114,74 @@ describe("generateRssFeed", () => {
 
 describe("generateAtomFeed", () => {
   it("returns Atom 1.0 namespace", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain('xmlns="http://www.w3.org/2005/Atom"');
   });
 
   it("contains <feed> root element", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("<feed");
     expect(result).toContain("</feed>");
   });
 
   it("includes feed title", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("Test Newsletter");
   });
 
   it("includes <entry> elements for each email", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("<entry>");
     expect(result).toContain("Hello World");
   });
 
   it("includes author information", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("Alice");
   });
 
   it("self-link points to atom URL", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain(`${BASE_URL}/atom/${FEED_ID}`);
   });
 
   it("includes rss alternate link", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain(`${BASE_URL}/rss/${FEED_ID}`);
   });
 
@@ -125,26 +192,49 @@ describe("generateAtomFeed", () => {
   });
 
   it("handles config without description", () => {
-    const configNoDesc: FeedConfig = { ...mockFeedConfig, description: undefined };
+    const configNoDesc: FeedConfig = {
-    const result = generateAtomFeed(configNoDesc, mockEmails, BASE_URL, FEED_ID);
+      ...mockFeedConfig,
+      description: undefined,
+    };
+    const result = generateAtomFeed(
+      configNoDesc,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain('xmlns="http://www.w3.org/2005/Atom"');
   });
 
   it("handles config with author field", () => {
     const configWithAuthor: FeedConfig = { ...mockFeedConfig, author: "Bob" };
-    const result = generateAtomFeed(configWithAuthor, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      configWithAuthor,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain("Bob");
   });
 
   it("includes enclosure link for email with attachment in Atom feed", () => {
-    const result = generateAtomFeed(mockFeedConfig, [mockEmailWithAttachment], BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      [mockEmailWithAttachment],
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).toContain('rel="enclosure"');
     expect(result).toContain("550e8400-e29b-41d4-a716-446655440000");
     expect(result).toContain("report.pdf");
   });
 
   it("does not include enclosure link for email without attachments in Atom feed", () => {
-    const result = generateAtomFeed(mockFeedConfig, mockEmails, BASE_URL, FEED_ID);
+    const result = generateAtomFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
     expect(result).not.toContain('rel="enclosure"');
   });
 });