Upgrade to ESLint 9 (solana-program#76)

Author: steveluscher

type-length-value/js/.eslintignore

@@ -0,0 +1,40 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import importExtensions from 'eslint-plugin-import-extensions';
+import { globalIgnores } from 'eslint/config';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+    globalIgnores([
+        '**/docs',
+        '**/lib',
+        '**/test-ledger',
+        '**/package-lock.json',
+    ]),
+    eslint.configs.recommended,
+    tseslint.configs.recommended,
+    {
+        plugins: {
+            'import-extensions': importExtensions,
+        },
+        rules: {
+            'import-extensions/require-extensions': 'error',
+        },
+    },
+    {
+        rules: {
+            '@typescript-eslint/ban-ts-comment': 'off',
+            '@typescript-eslint/no-explicit-any': 'off',
+            '@typescript-eslint/no-unused-vars': 'off',
+            '@typescript-eslint/no-empty-interface': 'off',
+            '@typescript-eslint/consistent-type-imports': 'error',
+        },
+    },
+    {
+        files: ['examples/**/*', 'test/**/*'],
+        rules: {
+            'import-extensions/require-extensions': 'off',
+        },
+    }
+);

type-length-value/js/.eslintrc

@@ -49,21 +49,22 @@
         "buffer": "^6.0.3"
     },
     "devDependencies": {
+        "@eslint/eslintrc": "^3.3.1",
+        "@eslint/js": "^9.24.0",
         "@solana/prettier-config-solana": "^0.0.5",
         "@types/chai": "^5.0.1",
         "@types/mocha": "^10.0.10",
         "@types/node": "^22.10.2",
-        "@typescript-eslint/eslint-plugin": "^8.4.0",
-        "@typescript-eslint/parser": "^8.4.0",
         "chai": "^5.1.2",
-        "eslint": "^8.57.0",
-        "eslint-plugin-require-extensions": "^0.1.1",
-        "prettier": "^3.4.2",
+        "eslint": "^9.24.0",
+        "eslint-plugin-import-extensions": "^0.1.5",
         "gh-pages": "^6.2.0",
         "mocha": "^11.0.1",
+        "prettier": "^3.4.2",
         "shx": "^0.3.4",
         "ts-node": "^10.9.2",
         "typedoc": "^0.27.4",
-        "typescript": "^5.7.2"
+        "typescript": "^5.8.3",
+        "typescript-eslint": "^8.30.0"
     }
 }