Lycolog

// undefinedの判定方法の違い。よほど特殊なことをしているのでなければ、基本的に後者でいい
if (typeof hoge === 'undefined') { }
if (hoge === undefined) { }

// 関数の定義方法の違い。どちらかに統一するほうが望ましい
function func1(param: T) { }
const func1 = (param: T) => {}

// 仮引数の定義方法の違い。これは分割代入とそれ以外で致命的に振る舞いが変わることがあるので統一することが望ましい
const func2 = ({ hoge, piyo }: { hoge: string, piyo: number }) => {}
const func2 = (param: { hoge: string, piyo: number }) => {}
type Func2Param = {
  hoge: string;
  piyo: number;
}
const func2 = (param: Func2Param) => {}

const reducer = (state, action) => {
  switch (action.type) {
    case 'update_account':
      updateAccountProc(state, action.payload);
    break;
      ...
  }
}

type Props = {
  onUserNameChanged: (username: string) => void;
  userName: string;
}

export const UserNameInputField = (props: Props) => {
  const onChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    props.onUserNameChanged(event.target.value);
  };

  return <input type="text" onChange={onChange} value={props.userName} />;
}

type Props = {
  onChange: (value: string) => void;
  value: string;
}

export const UserNameInputField = (props: Props) => {
  const onChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    /**
     * この辺りに長い色んな処理があるものとする
    */
    props.onChange(event.target.value);
    /**
     * この辺りに長い色んな処理があるものとする
    */
  };

  return <input type="text" onChange={onChange} value={props.value} />;
}

npm i next react react-dom
npm i -D @testing-library/jest-dom @testing-library/react @testing-library/react-hooks @types/jest @types/node @types/react @types/react-dom @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint eslint-config-next eslint-config-prettier eslint-config-react-app eslint-plugin-flowtype eslint-plugin-import eslint-plugin-jest eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks eslint-plugin-testing-library identity-obj-proxy jest jest-watch-typeahead prettier sass serve ts-jest typescript

|- .vscode/
  |- extensions.json
  |- launch.json
  |- settings.json
|- public/
|- src/
   |- components/
   |- pages/
|- .eslintignore
|- .eslintrc
|- .gitignore
|- .prettierrc
|- jest-setup.ts
|- jest.config.js
|- next-env.d.ts
|- next.config.js
|- package.json
|- tsconfig.jest.json
|- tsconfig.json

{
    "recommendations": [
        "dbaeumer.vscode-eslint",
        "esbenp.prettier-vscode",
        "msjsdiag.debugger-for-chrome"
    ]
}

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "attach",
            "name": "Next: Node",
            "skipFiles": ["<node_internals>/**", ".next/**"],
            "port": 9229
        },
        {
            "type": "chrome",
            "request": "launch",
            "name": "Next: Chrome",
            "url": "http://localhost:3000",
            "webRoot": "${workspaceFolder}",
            "sourceMapPathOverrides": {
                "webpack://_N_E/*": "${webRoot}/*"
            },
            "runtimeArgs": ["--profile-directory=debug-profile"]
        }
    ],
    "compounds": [
        {
            "name": "Next: Full",
            "configurations": ["Next: Node", "Next: Chrome"]
        }
    ]
}

// Place your settings in this file to overwrite default and user settings.
{
    "search.exclude": {
        "**/node_modules": true,
        "**/.next": true,
        "**/out": true,
        "**/coverage": true
    },
    "files.eol": "\n",
    "files.insertFinalNewline": true,
    "git.suggestSmartCommit": false,
    "git.autofetch": true,
    "editor.defaultFormatter": "esbenp.prettier-vscode",
    "editor.codeActionsOnSave": {
        "source.fixAll.eslint": true
    },
    "eslint.alwaysShowStatus": true,
    "eslint.validate": ["javascript", "typescript"],
    "editor.formatOnSave": true,
    "[javascript]": {
        "editor.tabSize": 2
    },
    "javascript.suggest.paths": true,
    "javascript.updateImportsOnFileMove.enabled": "always",
    "[typescript]": {
        "editor.tabSize": 2
    },
    "typescript.suggest.paths": true,
    "typescript.updateImportsOnFileMove.enabled": "always",
    "typescript.enablePromptUseWorkspaceTsdk": true,
    "typescript.tsdk": "node_modules/typescript/lib",
    "typescript.referencesCodeLens.enabled": true,
    "typescript.validate.enable": true,
    "typescript.preferences.importModuleSpecifier": "relative"
}

# /node_modules/* in the project root is ignored by default
# build artefacts
.next/*
out/*
coverage/*
# data definition files
**/*.d.ts

{
  "parser": "@typescript-eslint/parser",
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "react-app",
    "react-app/jest",
    "plugin:react/recommended",
    "prettier"
  ],
  "plugins": ["react", "@typescript-eslint"],
  "parserOptions": {
    "project": "./tsconfig.json",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "settings": {
    "react": {
      "version": "detect"
    }
  },
  "rules": {
    // Enforce the consistent use of either backticks, double, or single quotes
    "quotes": ["warn", "single"],
    // Enforce the consistent use of either function declarations or expressions
    "func-style": ["warn", "expression", { "allowArrowFunctions": true }],
    // Detect missing key prop
    "react/jsx-key": [
      "warn",
      { "checkFragmentShorthand": true, "checkKeyMustBeforeSpread": true }
    ],
    // Enforce shorthand or standard form for React fragments
    "react/jsx-fragments": ["warn", "syntax"],
    // Prevent missing React when using JSX
    "react/react-in-jsx-scope": "off",
    // Validate whitespace in and around the JSX opening and closing brackets
    "react/jsx-tag-spacing": [
      "warn",
      {
        "closingSlash": "never",
        "beforeSelfClosing": "always",
        "afterOpening": "never",
        "beforeClosing": "never"
      }
    ],
    // Prevent extra closing tags for components without children
    "react/self-closing-comp": [
      "warn",
      {
        "component": true,
        "html": true
      }
    ],
    // Allow non-explicit return types on functions and class methods
    "@typescript-eslint/explicit-function-return-type": "off",
    // Allow non-explicit return types on exported functions
    "@typescript-eslint/explicit-module-boundary-types": "off",
    // Disallow usage of the any type
    "@typescript-eslint/no-explicit-any": 1,
    // Disallows explicit type declarations for variables or parameters initialized to a number, string, or boolean
    "@typescript-eslint/no-inferrable-types": [
      "error",
      {
        "ignoreParameters": true
      }
    ],
    // Error on declared but not used variable
    "@typescript-eslint/no-unused-vars": "error"
  }
}

# /node_modules/* in the project root is ignored by default
# build artefacts
.next/*
out/*
coverage/*
# data definition files
**/*.d.ts
# config files
**/*.config.js

{
  "trailingComma": "es5",
  "printWidth": 80,
  "tabWidth": 2,
  "semi": true,
  "singleQuote": true
}

import '@testing-library/jest-dom';
import '@testing-library/jest-dom/extend-expect';

module.exports = {
  globals: {
    'ts-jest': {
      tsconfig: '<rootDir>/tsconfig.jest.json',
    },
  },
  preset: 'ts-jest',
  clearMocks: true,
  setupFilesAfterEnv: ['<rootDir>/jest-setup.ts'],
  roots: ['<rootDir>'],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'json', 'jsx'],
  collectCoverageFrom: ['src/**/*.{ts,tsx,js,jsx}'],
  testEnvironment: 'jsdom',
  testPathIgnorePatterns: ['<rootDir>[/\\\\](node_modules|.next)[/\\\\]'],
  transformIgnorePatterns: ['[/\\\\]node_modules[/\\\\].+\\.(ts|tsx)$'],
  transform: {
    '^.+\\.(ts|tsx)$': 'ts-jest',
  },
  watchPlugins: [
    'jest-watch-typeahead/filename',
    'jest-watch-typeahead/testname',
  ],
  moduleNameMapper: {
    '\\.(css|less|sass|scss)$': 'identity-obj-proxy',
    '\\.(gif|ttf|eot|svg|png)$': '<rootDir>/test/__mocks__/fileMock.js',
  },
};

/// <reference types="next" />
/// <reference types="next/types/global" />
/// <reference types="next/image-types/global" />

module.exports = (phase, { defaultConfig }) => {
  return {
    basePath: isProd ? '/deploy-path-here' : '',
    assetPrefix: isProd ? '/assets-path-here' : '',
  };
};

  "scripts": {
    "dev": "NODE_OPTIONS='--inspect' next",
    "start": "next",
    "build": "next build --profile && next export",
    "serve": "serve -p 3000 ./out",
    "test": "jest --watch",
    "type-check": "tsc --noEmit && eslint .",
    "headless-test": "npm run type-check && jest",
    "coverage": "jest --coverage"
  },

{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "lib": ["dom", "es2017"],
    "allowJs": true,
    "checkJs": true,
    "jsx": "react-jsx",
    "sourceMap": true,
    "noEmit": true,
    "isolatedModules": true,
    "strict": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "moduleResolution": "node",
    "baseUrl": "./",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true
  },
  "include": ["**/*.ts", "**/*.tsx"],
  "exclude": ["node_modules"]
}

{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "lib": ["dom", "es2017"],
    "allowJs": true,
    "checkJs": true,
    "jsx": "preserve",
    "sourceMap": true,
    "noEmit": true,
    "isolatedModules": true,
    "strict": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "moduleResolution": "node",
    "baseUrl": "./",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true
  },
  "include": ["**/*.ts", "**/*.tsx"],
  "exclude": ["node_modules"]
}