chore: update eslint to v9 with flat config

.prettierrc

@@ -4,7 +4,7 @@
   "tabWidth": 4,
   "overrides": [
     {
-      "files": [".prettierrc", "*.json", "*.yml", ".travis.yml", ".eslintrc"],
+      "files": [".prettierrc", "*.json", "*.yml", ".travis.yml"],
       "options": {
         "tabWidth": 2
       }

eslint.config.js

@@ -0,0 +1,20 @@
+import prettierConfig from 'eslint-config-prettier';
+import prettierPlugin from 'eslint-plugin-prettier';
+import globals from 'globals';
+import js from '@eslint/js';
+
+export default [
+    js.configs.recommended,
+    prettierConfig,
+    {
+        plugins: {
+            prettier: prettierPlugin,
+        },
+        languageOptions: {
+            globals: {
+                ...globals.browser,
+                global: true,
+            },
+        },
+    },
+];

package.json

@@ -46,10 +46,9 @@
     "@rollup/plugin-commonjs": "25.0.7",
     "@rollup/plugin-node-resolve": "15.2.3",
     "eslint": "9.0.0",
-    "eslint-config-airbnb-base": "15.0.0",
     "eslint-config-prettier": "9.1.0",
-    "eslint-plugin-import": "2.29.1",
     "eslint-plugin-prettier": "5.1.3",
+    "globals": "15.0.0",
     "prettier": "3.2.5",
     "rollup": "4.14.3",
     "tap": "15.2.3"

test/Event.test.js

@@ -2,7 +2,7 @@ import tap from 'tap';
 import Event from '../src/Event.js';
 import { toKey } from '../src/utils.js';
 
-tap.test('toKey() - should return key format', t => {
+tap.test('toKey() - should return key format', (t) => {
     const channel = 'foo';
     const topic = 'bar';
     const event = new Event(channel, topic, 'payload');

test/MessageBus.test.js

@@ -5,37 +5,36 @@ let bus;
 
 tap.beforeEach(() => {
     // Need to clear the global between tests for a clean slate
-    // eslint-disable-next-line no-undef
     globalThis['@podium'] = null;
     bus = new MessageBus();
 });
 
-tap.test('subscribe() - should be a function', t => {
+tap.test('subscribe() - should be a function', (t) => {
     t.ok(typeof bus.subscribe === 'function');
     t.end();
 });
 
-tap.test('publish() - should be a function', t => {
+tap.test('publish() - should be a function', (t) => {
     t.ok(typeof bus.publish === 'function');
     t.end();
 });
 
-tap.test('publish() - should invoke subscribed listener', t => {
+tap.test('publish() - should invoke subscribed listener', (t) => {
     const payload = { a: 'b' };
-    bus.subscribe('foo', 'bar', event => {
+    bus.subscribe('foo', 'bar', (event) => {
         t.equal(event.payload, payload);
         t.end();
     });
     bus.publish('foo', 'bar', payload);
 });
 
-tap.test('unsubscribe() - should remove subscribed listener', t => {
+tap.test('unsubscribe() - should remove subscribed listener', (t) => {
     const channel = 'channel';
     const topic = 'topic';
 
     let cbCount = 0;
 
-    const callback = event => {
+    const callback = (event) => {
         t.equal(event.channel, channel);
         t.equal(event.topic, topic);
         cbCount += 1;
@@ -61,12 +60,12 @@ tap.test('unsubscribe() - should remove subscribed listener', t => {
     t.end();
 });
 
-tap.test('peek() - should initially be undefined', t => {
+tap.test('peek() - should initially be undefined', (t) => {
     t.ok(bus.peek('channel', 'topic') === undefined);
     t.end();
 });
 
-tap.test('peek() - should return latest event', t => {
+tap.test('peek() - should return latest event', (t) => {
     const channel = 'channel';
     const topic = 'topic';
 
@@ -78,12 +77,12 @@ tap.test('peek() - should return latest event', t => {
     t.end();
 });
 
-tap.test('log() - should initially be empty', t => {
+tap.test('log() - should initially be empty', (t) => {
     t.same(bus.log('channel', 'topic'), []);
     t.end();
 });
 
-tap.test('log() - should retrieve earlier events, newest first', t => {
+tap.test('log() - should retrieve earlier events, newest first', (t) => {
     const channel = 'channel';
     const topic = 'topic';
 

test/Sink.test.js

@@ -7,17 +7,17 @@ tap.beforeEach(() => {
     sink = new Sink();
 });
 
-tap.test('log() - should be a function', t => {
+tap.test('log() - should be a function', (t) => {
     t.ok(typeof sink.log === 'function');
     t.end();
 });
 
-tap.test('log() - should initially return an empty array', t => {
+tap.test('log() - should initially return an empty array', (t) => {
     t.same(sink.log('foo', 'bar'), []);
     t.end();
 });
 
-tap.test('push() - should be a function', t => {
+tap.test('push() - should be a function', (t) => {
     t.ok(typeof sink.push === 'function');
     t.end();
 });

test/utils.test.js

@@ -1,7 +1,7 @@
 import tap from 'tap';
 import { toKey } from '../src/utils.js';
 
-tap.test('toKey() - should return key format', t => {
+tap.test('toKey() - should return key format', (t) => {
     const channel = 'foo';
     const topic = 'bar';
     t.ok(toKey(channel, topic) === `${channel}:${topic}`);