Convert to new flat config for eslint

eslint.config.js

@@ -0,0 +1,22 @@
+// @ts-check
+
+import eslint   from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default [
+   eslint.configs.recommended,
+   ...tseslint.configs.strictTypeChecked,
+   { ignores: ['**/*.js'] },
+   {
+      languageOptions: { parserOptions: { projectService: true } },
+      rules: {
+         '@typescript-eslint/no-confusing-void-expression':           'off',  //prefer minimal arrow functions
+         '@typescript-eslint/no-floating-promises':                   'off',  //annimations may be fire-and-forget
+         '@typescript-eslint/no-misused-promises':                    'off',  //annimations may be fire-and-forget
+         '@typescript-eslint/no-non-null-assertion':                  'off',  //ts cannot always know value exists
+         '@typescript-eslint/restrict-template-expressions':          'off',  //numbers in templates are natural
+         '@typescript-eslint/unbound-method':                         'off',  //safer to not use 'this'
+         '@typescript-eslint/use-unknown-in-catch-callback-variable': 'off',  //clarity over theoretical exceptions
+         },
+      },
+   ];

package.json

@@ -44,32 +44,13 @@
       "node": true,
       "mocha": true
    },
-   "eslintConfig": {
-      "ignorePatterns": [
-         "build",
-         "dist",
-         "node_modules"
-      ],
-      "root": true,
-      "parser": "@typescript-eslint/parser",
-      "plugins": [
-         "@typescript-eslint"
-      ],
-      "extends": [
-         "eslint:recommended",
-         "plugin:@typescript-eslint/recommended"
-      ],
-      "rules": {
-         "@typescript-eslint/no-non-null-assertion": "off"
-      }
-   },
    "runScriptsConfig": {
       "clean": [
          "rimraf build dist"
       ],
       "lint": [
          "jshint . --exclude-path .gitignore",
-         "eslint --max-warnings 0 src --ext .ts"
+         "eslint --max-warnings 0"
       ],
       "build": [
          "tsc",
@@ -98,28 +79,28 @@
       "examples": "npm test && node spec/examples.js"
    },
    "devDependencies": {
-      "@eslint/js": "~9.3",
-      "@fortawesome/fontawesome-free": "~6.5",
-      "@types/node": "~20.12",
+      "@eslint/js": "~9.9",
+      "@fortawesome/fontawesome-free": "~6.6",
+      "@types/node": "~22.2",
       "add-dist-header": "~1.4",
       "assert-deep-strict-equal": "~1.2",
       "copy-file-util": "~1.2",
       "copy-folder-util": "~1.1",
       "csso-cli": "~4.0",
       "dna-engine": "~3.2",
-      "eslint": "8.57.0",
+      "eslint": "~9.9",
       "esm-to-plain-js": "~1.1",
       "fetch-json": "~3.3",
       "jsdom": "~24.1",
       "jshint": "~2.13",
-      "mocha": "~10.4",
+      "mocha": "~10.7",
       "replacer-util": "~1.3",
-      "rimraf": "~5.0",
-      "run-scripts-util": "~1.2",
-      "typescript": "~5.4",
-      "typescript-eslint": "~7.11",
-      "uglify-js": "~3.17",
+      "rimraf": "~6.0",
+      "run-scripts-util": "~1.3",
+      "typescript": "~5.5",
+      "typescript-eslint": "~8.1",
+      "uglify-js": "~3.19",
       "w3c-html-validator": "~1.8",
-      "web-ignition": "~2.1"
+      "web-ignition": "~2.2"
    }
 }