Upgrade setup and use Node 20 (#3)

* Update eslint and mocha setup

* Update workflow

* Fix and supress eslint errors

.github/workflows/node.yml

@@ -11,10 +11,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: '16'
+          node-version: '20'
 
       - run: npm ci
       - run: npm run lint

.mocharc.json

@@ -0,0 +1,5 @@
+{
+  "extension": ["ts"],
+  "spec": "test/**/*.spec.ts",
+  "require": "ts-node/register"
+}

eslint.config.mjs

@@ -0,0 +1,52 @@
+import love from 'eslint-config-love'
+import tseslint from 'typescript-eslint'
+
+export default [
+  love,
+  ...tseslint.configs.strictTypeChecked,
+  ...tseslint.configs.stylisticTypeChecked,
+  {
+    plugins: {
+      tseslint: tseslint
+    },
+    rules: {
+      '@typescript-eslint/restrict-template-expressions': ['error', {
+        allowNumber: true,
+      }],
+      "@typescript-eslint/unbound-method": ['error', {
+        ignoreStatic: true,
+      }],
+    },
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module'
+      }
+    }
+  },
+  {
+    ignores: ['dist/**/*.*', '**/*.js', '**/*.mjs']
+  },
+  {
+    files: ['src/**/*.ts'],
+    languageOptions: {
+      parserOptions: {
+        project: ['tsconfig.json']
+      }
+    }
+  },
+  {
+    files: ['test/**/*.ts'],
+    languageOptions: {
+      parserOptions: {
+        project: ['tsconfig.test.json']
+      }
+    },
+    rules: {
+      '@typescript-eslint/restrict-template-expressions': ['error', {
+        allowNumber: true,
+      }],
+    }
+  }
+]