add linter

.eslintrc.cjs

@@ -0,0 +1,28 @@
+module.exports = {
+	root: true,
+	extends: ['eslint:recommended', 'prettier', 'plugin:unicorn/recommended'],
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2022
+	},
+	env: {
+		browser: true,
+		es2017: true,
+		node: true
+	},
+	plugins: ['unicorn'],
+	rules: {
+		'no-var': 'error',
+		'prefer-const': 'error',
+		quotes: ['error', 'single', { avoidEscape: true }],
+		'quote-props': ['error', 'as-needed'],
+		'no-constant-condition': ['error', { checkLoops: false }],
+		'no-duplicate-imports': 'error',
+		'no-inner-declarations': 'off',
+		'unicorn/prevent-abbreviations': 'off',
+		'unicorn/prefer-string-replace-all': 'off',
+		'unicorn/numeric-separators-style': 'off',
+		'unicorn/template-indent': 'off',
+		'unicorn/no-nested-ternary': 'off'
+	}
+}