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eslint-config-problems

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eslint-config-problems

An eslint config that catches problems in your code, without checking style. For use with prettier.

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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

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

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Package last updated on 25 Jan 2025

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