chore: upgrade build tools and modernize configuration

- Upgrade to googleapis/release-please-action@v4
- Update Node.js version to 24 in CI/CD
- Remove NPM_TOKEN (using trusted publishers)
- Upgrade ESLint to v9 with flat config format
- Upgrade Prettier and eslint-config-prettier to latest
- Add npm run format and npm run lint scripts
- Disable ESLint formatting rules (delegated to Prettier)
- Add .prettierignore to exclude CHANGELOG.md
- Fix ESLint warnings (unused error variables)
- Add CLAUDE.md and .claude to .gitignore

Author: andris9

.eslintrc

@@ -1,6 +1,13 @@
 {
     "rules": {
         "indent": 0,
+        "quotes": 0,
+        "linebreak-style": 0,
+        "semi": 0,
+        "comma-dangle": 0,
+        "comma-style": 0,
+        "arrow-body-style": 0,
+        "arrow-parens": 0,
         "no-await-in-loop": 0,
         "require-atomic-updates": 0
     },

.github/workflows/release.yaml

@@ -13,25 +13,21 @@ jobs:
     release-please:
         runs-on: ubuntu-latest
         steps:
-            - uses: google-github-actions/release-please-action@v3
+            - uses: googleapis/release-please-action@v4
               id: release
               with:
                   release-type: node
-                  package-name: ${{vars.NPM_MODULE_NAME}}
-                  pull-request-title-pattern: 'chore${scope}: release ${version} [skip-ci]'
             # The logic below handles the npm publication:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
               # these if statements ensure that a publication only occurs when
               # a new release is created:
               if: ${{ steps.release.outputs.release_created }}
-            - uses: actions/setup-node@v3
+            - uses: actions/setup-node@v4
               with:
-                  node-version: 20
+                  node-version: 24
                   registry-url: 'https://registry.npmjs.org'
               if: ${{ steps.release.outputs.release_created }}
             - run: npm ci
               if: ${{ steps.release.outputs.release_created }}
             - run: npm publish --provenance --access public
-              env:
-                  NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
               if: ${{ steps.release.outputs.release_created }}

.gitignore

@@ -103,4 +103,7 @@ dist
 # TernJS port file
 .tern-port
 
+# Claude Code
+CLAUDE.md
+.claude
 

.ncurc.js

@@ -1,8 +1,9 @@
+'use strict';
+
 module.exports = {
     upgrade: true,
     reject: [
         // Block package upgrades that moved to ESM
-        'nanoid',
-        'eslint-config-prettier'
+        'nanoid'
     ]
 };

.prettierignore

@@ -0,0 +1,3 @@
+node_modules
+package-lock.json
+CHANGELOG.md

.prettierrc.js

@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = {
     printWidth: 160,
     tabWidth: 4,

eslint.config.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const { FlatCompat } = require('@eslint/eslintrc');
+const js = require('@eslint/js');
+
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended
+});
+
+module.exports = [
+    {
+        ignores: ['node_modules/**', 'examples/**']
+    },
+    ...compat.extends('nodemailer', 'prettier'),
+    {
+        languageOptions: {
+            ecmaVersion: 2020,
+            sourceType: 'script',
+            globals: {
+                BigInt: 'readonly'
+            }
+        },
+        rules: {
+            // Disable all formatting rules (handled by Prettier)
+            indent: 0,
+            quotes: 0,
+            'linebreak-style': 0,
+            semi: 0,
+            'comma-dangle': 0,
+            'comma-style': 0,
+            'arrow-body-style': 0,
+            'arrow-parens': 0,
+            // Keep these disabled
+            'no-await-in-loop': 0,
+            'require-atomic-updates': 0
+        }
+    }
+];

lib/embeddings-query.js

@@ -150,7 +150,6 @@ async function embeddingsQuery(apiToken, opts) {
         promptText = promptText.substr(0, MAX_ALLOWED_TEXT_LENGTH);
     }
 
-    // eslint-disable-next-line no-constant-condition
     while (true) {
         prompt = `${SCHEMA_PROMPT}
 

lib/generate-embeddings.js

@@ -156,7 +156,7 @@ class Embedder {
                     subject = (value || '').toString().trim();
                     try {
                         subject = libmime.decodeWords(subject);
-                    } catch (err) {
+                    } catch {
                         // ignore?
                     }
                     if (subject) {
@@ -238,15 +238,15 @@ class Embedder {
                                 try {
                                     const parsedUrl = new URL(part.url);
                                     return `${parsedUrl.protocol}//${parsedUrl.host}`;
-                                } catch (err) {
+                                } catch {
                                     return ' ';
                                 }
                         }
                         return '';
                     })
                     .join('');
             }
-        } catch (err) {
+        } catch {
             // ignore?
         }
 
@@ -264,7 +264,7 @@ class Embedder {
                 let addr = address.address || '';
                 try {
                     name = libmime.decodeWords(name);
-                } catch (err) {
+                } catch {
                     // ignore?
                 }
 

lib/generate-summary.js

@@ -184,7 +184,6 @@ async function generateSummary(message, apiToken, opts) {
         promptText = promptText.substr(0, MAX_ALLOWED_TEXT_LENGTH);
     }
 
-    // eslint-disable-next-line no-constant-condition
     while (true) {
         content.text = promptText;
         prompt = `${userPrompt}