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.eslintrc.js
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.eslintrc.js
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module.exports = {
env: {
browser: true,
es2021: true,
},
extends: [
'eslint:recommended',
'plugin:react/recommended',
'plugin:import/typescript',
'plugin:@typescript-eslint/recommended',
// override all prettier rules, see https://github.com/prettier/eslint-config-prettier
'prettier',
],
parser: '@typescript-eslint/parser',
parserOptions: {
ecmaFeatures: {
jsx: true,
},
ecmaVersion: 12,
sourceType: 'module',
project: './tsconfig.json',
},
plugins: ['import', 'react', '@typescript-eslint'],
rules: {
// A few more opinions in addition to extensions
// As per React 17 changes! https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html
'react/react-in-jsx-scope': 'off',
'react/jsx-uses-react': 'off',
'linebreak-style': ['error', 'unix'],
'@typescript-eslint/no-require-imports': ['error'],
'@typescript-eslint/no-non-null-assertion': 'off',
'@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
// Style
quotes: ['error', 'single', { avoidEscape: true }],
// Require all imported dependencies are actually declared in package.json
'import/no-extraneous-dependencies': [
'error',
{
optionalDependencies: false, // Disallow importing optional dependencies (those shouldn't be in use in the project)
peerDependencies: false, // Disallow importing peer dependencies (that aren't also direct dependencies)
},
],
// Require all imported libraries actually resolve (!!required for import/no-extraneous-dependencies to work!!)
'import/no-unresolved': ['error'],
// Require an ordering on all imports
'import/order': [
'warn',
{
groups: ['builtin', 'external'],
alphabetize: { order: 'asc', caseInsensitive: true },
},
],
// Cannot import from the same module twice
'no-duplicate-imports': ['error'],
// Cannot shadow names
// note you must disable the base rule as it can report incorrect errors
'no-shadow': 'off',
'@typescript-eslint/no-shadow': ['error'],
// Required spacing in property declarations (copied from TSLint, defaults are good)
'key-spacing': ['error'],
// Require semicolons
semi: ['error', 'always'],
// Don't unnecessarily quote properties
'quote-props': ['error', 'consistent-as-needed'],
// No multiple empty lines
'no-multiple-empty-lines': ['error'],
// Max line lengths
'max-len': [
'error',
{
code: 120,
ignoreUrls: true, // Most common reason to disable it
ignoreStrings: true, // These are not fantastic but necessary for error messages
ignoreTemplateLiterals: true,
ignoreRegExpLiterals: true,
},
],
// One of the easiest mistakes to make
'@typescript-eslint/no-floating-promises': ['error'],
// Don't leave log statements littering the premises!
'no-console': ['error', { allow: ['info', 'warn', 'error'] }],
// Useless diff results
'no-trailing-spaces': ['error'],
// Must use foo.bar instead of foo['bar'] if possible
'dot-notation': ['error'],
// Are you sure | is not a typo for || ?
'no-bitwise': ['error'],
// Member ordering
'@typescript-eslint/member-ordering': [
'error',
{
default: [
'public-static-field',
'public-static-method',
'protected-static-field',
'protected-static-method',
'private-static-field',
'private-static-method',
'field',
// Constructors
'constructor', // = ['public-constructor', 'protected-constructor', 'private-constructor']
// Methods
'method',
],
},
],
},
};