[ESLINT] Depreciation warning: 'ecmaFeatures' config file prop is depreciated

[ahtee]

I was looking at tooling and came across this error in the webpack-dev-server cli command which output:

(node:22249) [ESLINT_LEGACY_ECMAFEATURES] DeprecationWarning: The 'ecmaFeatures' config file property is deprecated, and has no effect. (found in "react")

[samuel-gomez-axa]

i have the same problem , do you find solution ? my .eslintrc.json { "extends": ["airbnb", "prettier", "prettier/react", "react"], "plugins": ["prettier", "react", "react-hooks"], "env": { "browser": true, "node": true, "es6": true, "jest": true }, "rules": { "react/jsx-filename-extension": [ 1, { "extensions": [".js", ".jsx"] } ], "react/prop-types": 0, "react/no-unescaped-entities": "off", "react/require-default-props": "off", "react/no-unused-prop-types": "off", "react/no-unused-state": "error", "no-underscore-dangle": 0, "import/imports-first": ["error", "absolute-first"], "import/newline-after-import": "error", "quotes": ["error", "single"], "indent": ["error", 2], "react-hooks/rules-of-hooks": "error", "react-hooks/exhaustive-deps": "warn", "jsx-a11y/label-has-for": [ 2, { "components": ["label"], "required": { "every": [] }, "allowChildren": "false" } ], "jsx-a11y/label-has-associated-control": [ 2, { "controlComponents": ["Textarea", "File"], "detch": 3 } ], "max-len": [ "error", { "code": 500 } ] }, "globals": { "window": true, "document": true, "localStorage": true, "FormData": true, "FileReader": true, "Blob": true, "navigator": true, "fetch": true }, "parser": "babel-eslint", "settings": { "import/resolver": { "node": { "paths": ["src", "node_modules"], "extensions": [".js", ".jsx", ".ts", ".tsx"] } } } } package.json : "devDependencies": { "@babel/cli": "^7.6.0", "@babel/core": "^7.6.0", "@babel/plugin-proposal-class-properties": "^7.5.5", "@babel/plugin-transform-runtime": "^7.6.0", "@babel/preset-env": "^7.6.0", "@babel/preset-flow": "^7.0.0", "@babel/preset-react": "^7.0.0", "@commitlint/cli": "^8.2.0", "@commitlint/config-conventional": "^8.2.0", "@testing-library/react": "^9.1.4", "@testing-library/react-hooks": "^2.0.1", "babel-eslint": "^10.0.3", "babel-jest": "^24.9.0", "babel-loader": "8.0.5", "babel-plugin-require-context-hook": "^1.0.0", "concurrently": "^4.1.2", "cors": "^2.8.5", "enzyme-adapter-react-16": "^1.14.0", "eslint": "^5.16.0", "eslint-config-airbnb": "^17.1.1", "eslint-config-prettier": "^4.3.0", "eslint-config-react": "^1.1.7", "eslint-config-react-app": "^3.0.8", "eslint-plugin-flowtype": "^2.50.3", "eslint-plugin-import": "^2.18.2", "eslint-plugin-jsx-a11y": "^6.2.3", "eslint-plugin-prettier": "^3.1.1", "eslint-plugin-react": "^7.14.3", "eslint-plugin-react-hooks": "^1.7.0", "express": "^4.16.4", "highlight-loader": "^0.7.3", "husky": "^3.0.5", "jest-fetch-mock": "^2.1.1", "jest-sonar-reporter": "^2.0.0", "nodemon": "^1.19.2", "precise-commits": "^1.0.2", "prettier": "^1.18.2", "react-test-renderer": "^16.9.0", "stylelint-config-standard": "^18.2.0" },

[ahtee]

No, it's still apart of the root dir's package.json. I had a question though, im assuming eslintrc in the root dir cascades into each package created/managed from Lerna?

here's the line: https://github.com/facebook/react/blob/cef47cbc01b3c41ef4bfe3cdf7abd09c34e4a9c2/.eslintrc.js#L23 usually that ecmaFeatures key is instead a plugin.

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