init: 🔑 Setting JavaScript Env

.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    jest: true,
+    node: true, // 'module' is not defined. 에러가 발생하면 기입
+  },
+  extends: ['eslint:recommended', 'prettier'],
+  plugins: ['prettier'],
+  parserOptions: {
+    parser: 'babel-eslint',
+    ecmaVersion: 12,
+    sourceType: 'module',
+  },
+  rules: {
+    'prettier/prettier': [
+      'error',
+      {
+        singleQuote: true,
+        semi: true,
+        useTabs: false,
+        tabWidth: 2,
+        trailingComma: 'all',
+        printWidth: 80,
+        bracketSpacing: true,
+        arrowParens: 'avoid',
+        endOfLine: 'auto',
+      },
+    ],
+  },
+  overrides: [
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+        '**/tests/unit/**/*.spec.{j,t}s?(x)',
+      ],
+      env: {
+        jest: true,
+      },
+    },
+  ],
+};

babel.config.js

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+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
+        },
+      },
+    ],
+  ],
+};

jest.config.js

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+module.exports = {
+  moduleFileExtensions: ['js', 'json', 'jsx', 'ts', 'tsx', 'json'],
+  transform: {
+    '^.+\\.(js|jsx)?$': 'babel-jest',
+  },
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/$1',
+    '\\.(jpg|ico|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
+      '<rootDir>/__mocks__/fileMock.js',
+    '\\.(css|less)$': '<rootDir>/__mocks__/fileMock.js',
+  },
+  testMatch: ['<rootDir>/**/*.(js|jsx|ts|tsx)'],
+  transformIgnorePatterns: ['<rootDir>/node_modules/'],
+};

jsconfig.json

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+{
+  "compilerOptions": {
+    "baseUrl": "./",
+    "paths": {
+    }
+  },
+  "exclude": [
+    "node_modules",
+  ]
+}