design-system/eslint.config.mjs at main · ONSdigital/design-system · GitHub

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import { defineConfig, globalIgnores } from "eslint/config";
import prettier from "eslint-plugin-prettier";
import unusedImports from "eslint-plugin-unused-imports";
import globals from "globals";
import babelParser from "@babel/eslint-parser";
import path from "node:path";
import { fileURLToPath } from "node:url";
import js from "@eslint/js";
import { FlatCompat } from "@eslint/eslintrc";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const compat = new FlatCompat({
    baseDirectory: __dirname,
    recommendedConfig: js.configs.recommended,
    allConfig: js.configs.all
});

export default defineConfig([globalIgnores(["**/build/"]), {
    extends: compat.extends("prettier"),

    plugins: {
        prettier,
        "unused-imports": unusedImports,
    },

    languageOptions: {
        globals: {
            ...globals.browser,
            $: true,
            jQuery: true,
            browser: true,
            ga: true,
        },

        parser: babelParser,
    },

    rules: {
        "prettier/prettier": "error",
        "no-unused-vars": [1],
        "no-alert": 0,
        strict: [2, "never"],
        "new-cap": [0],
        "consistent-return": 0,
        "no-underscore-dangle": 0,
        "no-var": [1],
        "one-var": [0],

        "max-len": [0, {
            code: 140,
            ignoreUrls: true,
        }],

        "comma-dangle": ["error", "always-multiline"],
        "arrow-parens": 1,
        "unused-imports/no-unused-imports": "error",

        "unused-imports/no-unused-vars": ["error", {
            vars: "all",
            varsIgnorePattern: "^_",
            args: "after-used",
            argsIgnorePattern: "^_",
        }],
    },
}]);