chore: add eslint

.github/workflows/tests.yml

@@ -25,3 +25,6 @@ jobs:
 
       - name: Run e2e tests
         run: bun run test.e2e
+
+      - name: Run lint
+        run: bun run lint

.prettierrc.json

@@ -0,0 +1,10 @@
+{
+  "printWidth": 99,
+  "semi": true,
+  "useTabs": false,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "bracketSpacing": true,
+  "arrowParens": "always",
+  "quoteProps": "preserve"
+}

eslint.config.js

@@ -0,0 +1,24 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import pluginPrettier from 'eslint-plugin-prettier/recommended';
+
+export default [
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.browser,
+        Bun: 'readonly',
+      },
+      parserOptions: {
+        ecmaVersion: 'latest',
+      },
+    },
+  },
+  pluginJs.configs.recommended,
+  pluginPrettier,
+  {
+    ignores: ['node_modules/*', 'dist/*'],
+  },
+];

package.json

@@ -4,19 +4,28 @@
   "author": "Ghostery GmbH.",
   "description": "Converts urlfilters to DNR format",
   "license": "GPL-3.0",
+  "type": "module",
   "scripts": {
     "build": "bun ./scripts/build.js",
     "serve": "bun --watch scripts/serve.js",
     "test.unit": "bun test test/unit",
-    "test.e2e": "playwright test test/e2e/index.spec.js"
+    "test.e2e": "playwright test test/e2e/index.spec.js",
+    "lint": "eslint"
   },
   "dependencies": {
     "@adguard/scriptlets": "^1.12.1",
     "@adguard/tsurlfilter": "2.2.23",
     "@eyeo/webext-ad-filtering-solution": "1.5.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.13.0",
     "@ghostery/trackerdb": "^1.0.208",
-    "@playwright/test": "^1.45.3"
+    "@playwright/test": "^1.45.3",
+    "@types/bun": "^1.1.11",
+    "eslint": "^9.13.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "globals": "^15.11.0",
+    "prettier": "^3.3.3"
   }
 }

scripts/build.js

@@ -1,4 +1,4 @@
-import build from "./helpers/build.js";
+import build from './helpers/build.js';
 
 const startAt = Date.now();
 

scripts/helpers/build.js

@@ -1,31 +1,27 @@
-import fs from "node:fs";
-import path from "node:path";
+import fs from 'node:fs';
+import path from 'node:path';
 
-import { SOURCE_PATH, DIST_PATH } from "./paths.js";
+import { SOURCE_PATH, DIST_PATH } from './paths.js';
 
 export default async function build({ debug = false } = {}) {
   fs.rmSync(DIST_PATH, { recursive: true, force: true });
   fs.mkdirSync(DIST_PATH);
-  fs.copyFileSync(
-    path.join(SOURCE_PATH, "index.html"),
-    path.join(DIST_PATH, "index.html")
-  );
+  fs.copyFileSync(path.join(SOURCE_PATH, 'index.html'), path.join(DIST_PATH, 'index.html'));
 
   const result = await Bun.build({
-    entrypoints: [path.join(SOURCE_PATH, "index.js")],
+    entrypoints: [path.join(SOURCE_PATH, 'index.js')],
     outdir: DIST_PATH,
-    target: "browser",
+    target: 'browser',
     minify: !debug,
-    sourcemap: debug ? "inline" : "external",
+    sourcemap: debug ? 'inline' : 'external',
   });
 
   if (!result.success) {
-    console.error("Build failed");
+    console.error('Build failed');
     for (const message of result.logs) {
       // Bun will pretty print the message object
       console.error(message);
     }
     throw new Error(result.logs.join('\n'));
   }
 }
-

scripts/helpers/paths.js

@@ -1,5 +1,5 @@
-import path from "node:path";
+import path from 'node:path';
 
-export const ROOT_PATH = path.join(import.meta.dir, "..", "..");
-export const DIST_PATH = path.join(ROOT_PATH, "dist");
-export const SOURCE_PATH = path.join(ROOT_PATH, "src");
+export const ROOT_PATH = path.join(import.meta.dir, '..', '..');
+export const DIST_PATH = path.join(ROOT_PATH, 'dist');
+export const SOURCE_PATH = path.join(ROOT_PATH, 'src');

scripts/serve.js

@@ -1,33 +1,30 @@
-import { watch } from "node:fs";
-import path from "node:path";
+import { watch } from 'node:fs';
+import path from 'node:path';
 
-import build from "./helpers/build.js";
-import { SOURCE_PATH, DIST_PATH } from "./helpers/paths.js";
+import build from './helpers/build.js';
+import { SOURCE_PATH, DIST_PATH } from './helpers/paths.js';
 
 const PORT = 3000;
 
 await build();
 
-const watcher = watch(
-  SOURCE_PATH,
-  { recursive: true },
-  async (event, filename) => {
-    console.log(`Detected ${event} in ${filename}`);
-    try {
-      await build({ debug: true });
-    } catch (e) {
-      // no need to do anything as build logs errors already
-    }
+const watcher = watch(SOURCE_PATH, { recursive: true }, async (event, filename) => {
+  console.log(`Detected ${event} in ${filename}`);
+  try {
+    await build({ debug: true });
+    // eslint-disable-next-line no-unused-vars
+  } catch (e) {
+    // no need to do anything as build logs errors already
   }
-);
+});
 
 Bun.serve({
   port: PORT,
   development: true,
   async fetch(req) {
     let filePath = new URL(req.url).pathname;
-    if (filePath === "/") {
-      filePath += "index.html";
+    if (filePath === '/') {
+      filePath += 'index.html';
     }
     const file = Bun.file(path.join(DIST_PATH, filePath));
     return new Response(file);
@@ -39,9 +36,9 @@ Bun.serve({
 
 console.log(`Starting dev server at port: ${PORT}`);
 
-process.on("SIGINT", () => {
+process.on('SIGINT', () => {
   // close watcher when Ctrl-C is pressed
-  console.log("Closing server...");
+  console.log('Closing server...');
   watcher.close();
 
   process.exit(0);

scripts/update.js

@@ -1,13 +1,13 @@
-import { writeFileSync } from "node:fs";
-import { join, dirname } from "node:path";
-import { fileURLToPath } from "node:url";
+import { writeFileSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
 
-import adguardDialects from "@adguard/scriptlets/dist/redirects.json" with { type: "json" };
+import adguardDialects from '@adguard/scriptlets/dist/redirects.json';
 
 const CWD = dirname(fileURLToPath(import.meta.url));
 
 async function downloadResource(resourceName) {
-  console.log("Downloading resources...");
+  console.log('Downloading resources...');
 
   const { revisions } = await fetch(
     `https://cdn.ghostery.com/adblocker/resources/${resourceName}/metadata.json`,
@@ -24,22 +24,17 @@ async function downloadResource(resourceName) {
     `https://cdn.ghostery.com/adblocker/resources/${resourceName}/${latestRevision}/list.txt`,
   ).then((result) => {
     if (!result.ok) {
-      throw new Error(
-        `Failed to fetch ${resourceName}: ${result.status}: ${result.statusText}`,
-      );
+      throw new Error(`Failed to fetch ${resourceName}: ${result.status}: ${result.statusText}`);
     }
     return result.text();
   });
 }
 
 function extractRedirects(data) {
-  console.log("Extracting resources...");
+  console.log('Extracting resources...');
 
   const resources = JSON.parse(data);
-  const mappings = resources.redirects.map((redirect) => [
-    redirect.name,
-    redirect.aliases ?? [],
-  ]);
+  const mappings = resources.redirects.map((redirect) => [redirect.name, redirect.aliases ?? []]);
 
   // Integrate adguard mappings
   for (const dialect of adguardDialects) {
@@ -77,7 +72,7 @@ function extractRedirects(data) {
 }
 
 writeFileSync(
-  join(CWD, "..", "src", "mappings.json"),
-  extractRedirects(await downloadResource("ublock-resources-json")),
-  "utf-8",
+  join(CWD, '..', 'src', 'mappings.json'),
+  extractRedirects(await downloadResource('ublock-resources-json')),
+  'utf-8',
 );

src/converters/abp.js

@@ -1,6 +1,9 @@
-import { FilterParsingError, normalize } from "@eyeo/webext-ad-filtering-solution/adblockpluscore/lib/filters/index.js";
-import { createConverter } from "@eyeo/webext-ad-filtering-solution/adblockpluscore/lib/dnr/index.js";
-import { normalizeFilter, normalizeRule, DEFAULT_PARAM_MAPPING } from "./helpers";
+import {
+  FilterParsingError,
+  normalize,
+} from '@eyeo/webext-ad-filtering-solution/adblockpluscore/lib/filters/index.js';
+import { createConverter } from '@eyeo/webext-ad-filtering-solution/adblockpluscore/lib/dnr/index.js';
+import { normalizeFilter, normalizeRule, DEFAULT_PARAM_MAPPING } from './helpers';
 
 const PARAM_MAPPING = {
   ...DEFAULT_PARAM_MAPPING,
@@ -27,7 +30,7 @@ export default async function convert(filters) {
           rules.push(rule);
         }
       } else {
-        throw new Error("Unknown problem");
+        throw new Error('Unknown problem');
       }
     } catch (e) {
       errors.push(`Error: "${e.message}" in rule: "${filter}"`);

src/converters/adguard.js

@@ -1,16 +1,10 @@
-import { DeclarativeFilterConverter, Filter } from "@adguard/tsurlfilter/es/declarative-converter";
-import { normalizeFilter, normalizeRule } from "./helpers.js";
+import { DeclarativeFilterConverter, Filter } from '@adguard/tsurlfilter/es/declarative-converter';
+import { normalizeFilter, normalizeRule } from './helpers.js';
 
 const converter = new DeclarativeFilterConverter();
 
-const createFilter = (
-  rules,
-  filterId = 0,
-) => {
-  return new Filter(
-      filterId,
-      { getContent: async () => rules },
-  );
+const createFilter = (rules, filterId = 0) => {
+  return new Filter(filterId, { getContent: async () => rules });
 };
 
 export default async function convert(rules, { resourcesPath } = {}) {
@@ -19,7 +13,7 @@ export default async function convert(rules, { resourcesPath } = {}) {
   const declarativeRules = await conversionResult.ruleSet.getDeclarativeRules();
 
   return {
-    rules: declarativeRules.map(rule => normalizeRule(rule)),
+    rules: declarativeRules.map((rule) => normalizeRule(rule)),
     errors: conversionResult.errors,
     limitations: conversionResult.limitations,
   };