dcai

npm init -y
npx mrm gitignore prettier jest
npm i -D @babel/core babel-jest @babel/eslint-parser # use babel for eslint and jest
npm i -D eslint-config-prettier eslint-plugin-prettier
npm i -D @babel/preset-env @babel/plugin-transform-modules-commonjs # for compile js

.eslintrc.js

module.exports = {
  parser: '@babel/eslint-parser',
  parserOptions: {
    sourceType: 'module',
    requireConfigFile: false,
  },
  // babelOptions: {
  //   presets: ['@babel/preset-react'],
  // },
  env: {
    commonjs: true,
    jest: true,
    es6: true,
    node: true,
    browser: true,
  },
  extends: ["plugin:prettier/recommended"],
  rules: {
    'no-undef': 'error',
    'no-unused-vars': 'warn',
    'no-console': 'off',
  },
};

prettier.config.js

module.exports = {
  $schema: 'http://json.schemastore.org/prettierrc',
  arrowParens: 'always',
  printWidth: 88,
  useTabs: false,
  singleQuote: true,
  tabWidth: 2,
  trailingComma: 'all',
  overrides: [
    {
      files: ['*.yaml', '*.yml'],
      options: {
        singleQuote: false,
      },
    },
  ],
};

.editorconfig

[*.{js,ts}]
charset = utf-8
indent_style = space
indent_size = 2
 
[git/config]
indent_style = tab
 
[Makefile]
indent_style = tab
 
[*.{json,yaml,yml}]
indent_style = space
indent_size = 2

package.json

{
  {
    "transform": {
      "^.+\\.[t|j]sx?$": "babel-jest"
    },
    "setupFiles": [
      "./test/jestsetup.js"
    ]
  }
}

babel.config.js

'use strict';
 
module.exports = function (api) {
    api.cache(true);
 
    const envOpts = {
        modules: 'commonjs',
        targets: {
            node: '10'
        }
    };
    const presets = [['@babel/preset-env', envOpts]];
    const plugins = [];
 
    return {
        presets,
        plugins
    };
};