eslint.config.mjs

import typescriptEslint from "@typescript-eslint/eslint-plugin";
import prettier from "eslint-plugin-prettier";
import globals from "globals";
import tsParser from "@typescript-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 [{
    ignores: ["**/scratch", "**/*.js"],
}, ...compat.extends("eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier"), {
    plugins: {
        "@typescript-eslint": typescriptEslint,
        prettier,
    },

    languageOptions: {
        globals: {
            ...globals.browser,
        },

        parser: tsParser,
        ecmaVersion: "latest",
        sourceType: "module",

        parserOptions: {
            project: "./tsconfig.json",
        },
    },

    rules: {
        "max-len": ["error", 120],
        semi: ["error", "always"],
        "no-unused-vars": ["off"],
        "no-constant-condition": ["off"],

        "semi-spacing": ["error", {
            before: false,
            after: true,
        }],

        "no-empty": ["error", {
            allowEmptyCatch: true,
        }],

        "object-curly-spacing": ["error", "always"],
        "comma-spacing": ["error"],
        "computed-property-spacing": ["error"],

        "brace-style": ["error", "1tbs", {
            allowSingleLine: true,
        }],

        "eol-last": ["error"],
        "semi-style": ["error", "last"],

        "prefer-const": ["error", {
            destructuring: "all",
        }],

        curly: ["error"],
        "prettier/prettier": "warn",
        "@typescript-eslint/no-unused-vars": ["off"],
        "@typescript-eslint/no-non-null-assertion": ["off"],
        "@typescript-eslint/no-explicit-any": ["off"],
        "@typescript-eslint/no-unnecessary-type-assertion": ["error"],

        "@typescript-eslint/no-unnecessary-condition": ["error", {
            allowConstantLoopConditions: true,
        }],

        "@typescript-eslint/no-this-alias": ["error", {
            allowedNames: ["self"],
        }],

        "@typescript-eslint/no-floating-promises": ["error"],
        "@typescript-eslint/no-misused-promises": ["error"],
        "@typescript-eslint/await-thenable": ["error"],

        "@typescript-eslint/naming-convention": ["error", {
            selector: "variable",
            format: ["snake_case", "UPPER_CASE", "snake_case"],
            leadingUnderscore: "allow",
        }, {
            selector: "variable",
            format: null,
            modifiers: ["destructured"],
        }],
    },
}];