.eslintrc.js

module.exports = {
  root: true,
  env: { browser: true, es2020: true },
  extends: [
    'next',
    'prettier',
    'eslint-config-prettier',
    'eslint-config-next',
    'plugin:@typescript-eslint/recommended',
  ],
  plugins: ['unused-imports', 'prettier', '@typescript-eslint'],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    sourceType: 'module',
    ecmaVersion: 'latest',
    ecmaFeatures: { jsx: true },
    project: './tsconfig.json',
  },
  settings: {
    'import/resolver': {
      typescript: {
        project: './tsconfig.json',
      },
    },
  },

  //  * 0 ~ 'off'
  //  * 1 ~ 'warn'
  //  * 2 ~ 'error'

  rules: {
    // general
    'no-alert': 0,
    // camelcase: 0,
    'no-console': 0,
    'no-unused-vars': 1,
    'no-nested-ternary': 1,
    'no-param-reassign': 0,
    'no-underscore-dangle': 0,
    'no-restricted-exports': 0,
    'no-promise-executor-return': 0,
    'import/prefer-default-export': 0,
    'prefer-destructuring': [1, { object: true, array: false }],

    // typescript
    '@typescript-eslint/naming-convention': 0,
    '@typescript-eslint/no-use-before-define': 1,
    '@typescript-eslint/consistent-type-exports': 1,
    '@typescript-eslint/consistent-type-imports': 1,
    '@typescript-eslint/no-unused-vars': [1, { args: 'none' }],

    // react
    'react/no-children-prop': 0,
    'react/react-in-jsx-scope': 0,
    'react/no-array-index-key': 0,
    'react/require-default-props': 0,
    'react/jsx-props-no-spreading': 0,
    'react/function-component-definition': 0,
    'react/jsx-no-useless-fragment': [1, { allowExpressions: true }],
    'react/no-unstable-nested-components': [1, { allowAsProps: true }],
    'react/jsx-no-duplicate-props': [1, { ignoreCase: false }],

    // jsx-a11y
    'jsx-a11y/anchor-is-valid': 0,
    'jsx-a11y/control-has-associated-label': 0,

    // unused imports
    'unused-imports/no-unused-imports': 1,
    'unused-imports/no-unused-vars': [
      1,
      {
        vars: 'all',
        varsIgnorePattern: '^_',
        args: 'after-used',
        argsIgnorePattern: '^_',
      },
    ],
  },
};