I have created a react app using CRA (typescript template) and TypeScript is not following rules written in ESLint config. This is quite weird for me because I use this config in every react project I setup. I'm sharing below some information that might be useful.
.eslintrc
None of the rules written below are being followed by TypeScript.
{
"parser": "@typescript-eslint/parser",
"plugins": ["react-hooks"],
"extends": ["airbnb-typescript", "plugin:@typescript-eslint/recommended"],
"parserOptions": { "project": "./tsconfig.json" },
"rules": {
"react/prop-types": "off",
"quotes": ["error", "single"],
"newline-before-return": "error",
"import/prefer-default-export": "off",
"react-hooks/rules-of-hooks": "error",
"react-hooks/exhaustive-deps": "error",
"lines-between-class-members": "error",
"import/newline-after-import": ["error", { "count": 1 }],
"comma-dangle": [
"error",
{
"arrays": "always-multiline",
"objects": "always-multiline",
"imports": "always-multiline",
"exports": "always-multiline",
"functions": "always-multiline"
}
]
},
"ignorePatterns": [
"config",
"public",
"scripts",
"serviceWorker.ts",
"setupTests,ts"
]
}
tsconfig.json
{
"compilerOptions": {
"target": "es5",
"lib": [
"dom",
"dom.iterable",
"esnext"
],
"allowJs": true,
"skipLibCheck": true,
"esModuleInterop": true,
"allowSyntheticDefaultImports": true,
"strict": true,
"forceConsistentCasingInFileNames": true,
"module": "esnext",
"moduleResolution": "node",
"resolveJsonModule": true,
"isolatedModules": true,
"noEmit": true,
"jsx": "react"
},
"include": [
"src"
]
}
package.json
{
"name": "foo",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^16.13.1",
"react-dom": "^16.13.1"
},
"scripts": {
"start": "node scripts/start.js",
"build": "node scripts/build.js",
"test": "node scripts/test.js"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"jest": {
"roots": [
"<rootDir>/src"
],
"collectCoverageFrom": [
"src/**/*.{js,jsx,ts,tsx}",
"!src/**/*.d.ts"
],
"setupFiles": [
"react-app-polyfill/jsdom"
],
"setupFilesAfterEnv": [
"<rootDir>/src/setupTests.ts"
],
"testMatch": [
"<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
"<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
],
"testEnvironment": "jest-environment-jsdom-fourteen",
"transform": {
"^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
"^.+\\.module\\.(css|sass|scss)$"
],
"modulePaths": [],
"moduleNameMapper": {
"^react-native$": "react-native-web",
"^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
},
"moduleFileExtensions": [
"web.js",
"js",
"web.ts",
"ts",
"web.tsx",
"tsx",
"json",
"web.jsx",
"jsx",
"node"
],
"watchPlugins": [
"jest-watch-typeahead/filename",
"jest-watch-typeahead/testname"
]
},
"babel": {
"presets": [
"react-app"
]
},
"devDependencies": {
"@babel/core": "7.9.0",
"@svgr/webpack": "4.3.3",
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.5.0",
"@testing-library/user-event": "^7.2.1",
"@types/jest": "^24.9.1",
"@types/node": "^12.12.62",
"@types/react": "^16.9.49",
"@types/react-dom": "^16.9.8",
"@types/react-router-dom": "^5.1.5",
"@typescript-eslint/eslint-plugin": "^2.10.0",
"@typescript-eslint/parser": "^2.10.0",
"babel-eslint": "10.1.0",
"babel-jest": "^24.9.0",
"babel-loader": "8.1.0",
"babel-plugin-named-asset-import": "^0.3.6",
"babel-preset-react-app": "^9.1.2",
"camelcase": "^5.3.1",
"case-sensitive-paths-webpack-plugin": "2.3.0",
"css-loader": "3.4.2",
"dotenv": "8.2.0",
"dotenv-expand": "5.1.0",
"eslint": "^6.6.0",
"eslint-config-react-app": "^5.2.1",
"eslint-loader": "3.0.3",
"eslint-plugin-flowtype": "4.6.0",
"eslint-plugin-import": "2.20.1",
"eslint-plugin-jsx-a11y": "6.2.3",
"eslint-plugin-react": "7.19.0",
"eslint-plugin-react-hooks": "^1.6.1",
"file-loader": "4.3.0",
"fs-extra": "^8.1.0",
"html-webpack-plugin": "4.0.0-beta.11",
"identity-obj-proxy": "3.0.0",
"jest": "24.9.0",
"jest-environment-jsdom-fourteen": "1.0.1",
"jest-resolve": "24.9.0",
"jest-watch-typeahead": "0.4.2",
"mini-css-extract-plugin": "0.9.0",
"optimize-css-assets-webpack-plugin": "5.0.3",
"pnp-webpack-plugin": "1.6.4",
"postcss-flexbugs-fixes": "4.1.0",
"postcss-loader": "3.0.0",
"postcss-normalize": "8.0.1",
"postcss-preset-env": "6.7.0",
"postcss-safe-parser": "4.0.1",
"react-app-polyfill": "^1.0.6",
"react-dev-utils": "^10.2.1",
"resolve": "1.15.0",
"resolve-url-loader": "3.1.1",
"sass-loader": "8.0.2",
"semver": "6.3.0",
"style-loader": "0.23.1",
"terser-webpack-plugin": "2.3.8",
"ts-pnp": "1.1.6",
"typescript": "^3.7.5",
"url-loader": "2.3.0",
"webpack": "4.42.0",
"webpack-dev-server": "3.11.0",
"webpack-manifest-plugin": "2.2.0",
"workbox-webpack-plugin": "4.3.1"
}
}
Note: React app has been ejected
Fixed:
My editor VS Code was missing this in
settings.json: "eslint.validate": ["typescript", "typescriptreact"]This is needed to explicitly tell ESLint to watch TypeScript files for linting errors (by default it lints only JavaScript and JSX files).
Hope this helps you as well! :)