eslint-config-problems

eslint-config-problems is an ESLint config that doesn't regulate your code style. It only catches actual problems with your code.

It's designed for use with Prettier, the opinionated code formatter.

Contents

• Rules
  • I disagree with rule X; you missed rule Y
• Installation & Usage
• License

Rules

Rules were chosen based on the following criteria:

• No stylistic rules; nothing that Prettier can fix
• Prevent guaranteed runtime errors (i.e. no undefined variables)
• Disallow "evil" things like eval
• Disallow archaic language features like with
• Disallow obvious bad practices like new Number(13)
• Force usage of ES2015+ features
• Point out places the code could be made shorter. For example:

  if (someCondition) return someValue;
  else {
    // Do something else
  }

  The else block is unneeded, since the if block contains a return statement. eslint-config-problems will point this out to you (or auto-fix with the --fix option).

I disagree with rule X; you missed rule Y

If you disagree; feel free to open an issue. I'm open to changing rules if you have a good reason.

If I missed a rule that prevents an actual problem or is otherwise in keeping with the general guidelines above, please open an issue as well; I just might add it.

Installation & Usage

eslint-config-problems is designed to work with ESLint v9+; if you're still using ESLint v8 or earlier, use eslint-config-problems v8.0.0.

---

npm install -D eslint eslint-config-problems

In your eslint.config.js:

import problems from 'eslint-config-problems';

export default [
  problems,
  {
    rules: {
      // custom rules
    },
  },
];

License

ISC