Changes to enforce code quality.

.editorconfig

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+# https://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.json]
+indent_size = 2

.eslintrc.js

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+module.exports = {
+  'env': {
+    'commonjs': true,
+    'es2021': true,
+    'node': true,
+    'mocha': true,
+  },
+  'extends': ['eslint:recommended', 'google'],
+  'overrides': [
+    {
+      'env': {
+        'node': true,
+      },
+      'files': [
+        '.eslintrc.{js,cjs}',
+      ],
+      'parserOptions': {
+        'sourceType': 'script',
+      },
+    },
+  ],
+  'parserOptions': {
+    'ecmaVersion': 'latest',
+  },
+  'rules': {
+  },
+};

.husky/pre-commit

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+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npm test

.lintstagedrc.json

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+{
+  "*.js": "eslint --fix",
+  "*.{json,md}": "prettier --write"
+}

.pretterignore

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+package.json
+package-lock.json