How to configure eslint with nodejs express application

Question

js application. I need to use eslint for this application. I am using https://www.npmjs.com/package/eslint-config-airbnb and using prettier plugin in VS Code editor.

.eslintrc

{
  "extends": "airbnb"
}

I see that VS Code is giving me lot of errors in complete project now after adding eslint plugin https://marketplace.visualstudio.comitems?itemName=dbaeumer.vscode-eslint and npm package.

Few errors

[eslint] Definition for rule 'jsx-a11y/href-no-hash' was not found (jsx-a11y/href-no-hash)
[eslint] Expected linebreaks to be 'LF' but found 'CRLF'. (linebreak-style)
[eslint] Unexpected unnamed function. (func-names)
[eslint] Missing space before function parentheses. (space-before-function-paren)
[eslint] Strings must use singlequote. (quotes)
[eslint] Unexpected function expression. (prefer-arrow-callback)
[eslint] Unexpected unnamed function 'bind'. (func-names)
[eslint] Missing space before function parentheses. (space-before-function-paren)

package.json

  "devDependencies": {
    "babel": "^6.23.0",
    "babel-cli": "^6.5.1",
    "babel-core": "^6.9.0",
    "babel-eslint": "^7.2.3",
    "babel-preset-es2015": "^6.5.0",
    "babel-preset-stage-0": "6.5.0",
    "eslint": "^3.19.0",
    "eslint-config-airbnb": "^15.1.0",
    "eslint-plugin-import": "^2.7.0",
    "eslint-plugin-jsx-a11y": "^6.0.2",
    "eslint-plugin-react": "^7.4.0",
    "nodemon": "^1.12.1"
  }

index.js

import request from "superagent";

module.exports = function(req, res, next) {
  const id = "abc";

  request
    .post(url)
    .send(`p1=v1`)
    .send(`p2=v2`)
    .end(function(error, response) {}.bind(this));
  next();
};

Same kind of errors in each JS files. Does anyone know how to resolve these ?

Answer 1

1) Add the following modules to your devDependencies using:

npm install --save-dev eslint
npm install --save-dev eslint-config-airbnb-base
npm install --save-dev eslint-plugin-import

2) Add an eslintConfig section to your package.json:

"eslintConfig": {
    "extends": "airbnb-base",
    "env": {
        "es6": true,
        "browser": true
    },
    "rules": {
        "brace-style": [
            "error",
            "stroustrup"
        ],
        "comma-dangle": [
            "error",
            "never"
        ],
        "no-unused-vars": [
            "warn"
        ],
        "no-var": [
            "off"
        ],
        "one-var": [
            "off"
        ]
    }
}

3) Visit eslint.org/docs/rules, search for the warnings you want to tweak and add them to the eslintConfig above.

4) Delete the .eslintrc file in the root of your project.

5) Restart your IDE