feat: upgrade to ESLint v9 & all related dependencies 🔥

BREAKING CHANGE: Many rules have been changed, if you have a lot of overrides expect some work to move to a different rule.

Author: robertrossmann

.github/CODEOWNERS

@@ -8,6 +8,7 @@
 /packages/eslint-config-base/                   @robertrossmann
 /packages/eslint-config-node/                   @robertrossmann
 /packages/eslint-config-mocha/                  @robertrossmann
+/packages/eslint-config-typescript/             @robertrossmann
 /packages/eslint-config-graphql/                @developer239
 /packages/eslint-config-react/                  @robertrossmann @matejpolak
 /packages/prettier-config/                      @robertrossmann @matejpolak

.github/workflows/commitlint.yaml

@@ -13,12 +13,12 @@ jobs:
       CI: 'true'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - run: make install

.github/workflows/deploy.yaml

@@ -13,12 +13,12 @@ jobs:
       CI: 'true'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - run: make install

.github/workflows/lint.yaml

@@ -11,12 +11,12 @@ jobs:
       CI: 'true'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - run: make install

documentation/eslint/migration.md

@@ -71,7 +71,7 @@ const files = {
 }
 
 // This will allow your IDE to provide autocomplete suggestions ✨
-/** @type {Array<import("eslint").Linter.FlatConfig>} */
+/** @type {Array<import("eslint").Linter.Config>} */
 const config = [{
   linterOptions: {
     reportUnusedDisableDirectives: true,