eslint-config-madgex

ESLint rules related to Madgex projects.

Install

npm install eslint@9 @madgex/eslint-config-madgex -save-dev

VSCode extension

Use the official VSCode ESLint Extension v3.0.5+ (you might need to switch to pre-release version)

Usage

⚠️ Recomended to use only 1 type of source file in your repo, either commonjs or module (esm). eslint & eslint-plugin-n (this config depends on) has difficulty supporting both at the same time in a monorepo.

eslint-plugin-n which is a part of our config, reads the package.json for node version, and what type of JS files you use (ESM or commonjs).

// package.json
{
  ...
  "type": "module", // "module" (ESM), or "commonjs" - you cant use both
  {
    "engines": {
      "node": ">=18"
    }
  },
  ...
}

eslint-plugin-n also recognises .npmignore files which will silence warnings of missing dependancies when they are installed as devDependancies.

Node/Browser

// eslint.config.js
import configMadgex from '@madgex/eslint-config-madgex';

export default [...configMadgex];

Vue

config order matters.

// eslint.config.js
import configMadgex from '@madgex/eslint-config-madgex';
import pluginVue from 'eslint-plugin-vue';
// pluginVue.configs['flat/recommended'] has prettier conflicts

export default [...configMadgex, ...pluginVue.configs['flat/essential']];

Rules

Notes regarding specific rules enforced in this config:

• no-param-reassign - Disallow reassigning function parameters, except for accu which is the accumulator in a .reduce() e.g.

  Array.reduce((accu, key) => {
    accu[key] = getVal(key);
  
    return accu;
  }, {});

• no-unused-vars - Disallow unused variables, except for request and h as found on hapi.js route handlers.