update ESLint to v8, config improvements

.eslintignore

@@ -0,0 +1 @@
+dist

.eslintrc.cjs

@@ -1,35 +1,25 @@
 module.exports = {
+  root: true,
   env: {
     es2021: true,
     node: true,
   },
   extends: [
     'eslint:recommended',
-    'plugin:@typescript-eslint/recommended',
     'airbnb-base',
+    'airbnb-typescript/base',
+    'plugin:@typescript-eslint/recommended',
   ],
-  globals: {
-    translationJSON: true,
-  },
   parser: '@typescript-eslint/parser',
   parserOptions: {
     ecmaVersion: 12,
     sourceType: 'module',
+    project: './tsconfig.json',
   },
   plugins: [
     '@typescript-eslint',
   ],
   rules: {
-    'import/extensions': [
-      'error',
-      'ignorePackages',
-      {
-        js: 'never',
-        mjs: 'never',
-        jsx: 'never',
-        ts: 'never',
-        tsx: 'never',
-      },
-    ],
+    'no-console': 'off',
   },
 };

index.ts

@@ -1,3 +1,3 @@
-import { sum } from './src';
+import sum from './src';
 
-console.log(sum(1, 1));
+console.log(sum(1, 1));

jest.config.js

@@ -1,13 +1,13 @@
 export default {
-    "roots": [
-        "<rootDir>/src",
-        "<rootDir>/spec",
-    ],
-    "testMatch": [
-        "**/__tests__/**/*.+(ts|tsx|js)",
-        "**/?(*.)+(spec|test).+(ts|tsx|js)"
-    ],
-    "transform": {
-        "^.+\\.(ts|tsx)$": "ts-jest"
-    },
-}
+  rootDir: './',
+  roots: [
+    '<rootDir>/src',
+    '<rootDir>/spec',
+  ],
+  testMatch: [
+    '**/?(*.)+(spec).+(ts|tsx|js)',
+  ],
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest',
+  },
+};

makefile

@@ -20,4 +20,7 @@ test:
 	make run c="npm run test"
 
 update:
-	make run c="npm update"
+	make run c="npm update"
+
+lint:
+	make run c="npm run lint"