eslint-no-javascript

I recently found an eslint rule called no-plusplus. It's based on the logic that this code—

i
++
j

—increments j instead of i, which is confusing, so what we're going to do is ban the ++ operator. This logic is completely sound and reasonable, as are all the other eminently sensible rules that eslint enforces by default. If I have one criticism of them, it is that they do not go far enough. And to that end, I have created eslint-no-javascript, which enforces that developers must not use JavaScript. Any code in your source other than whitespace and comments will be rejected, and if you use the --fix option it will be removed.

JavaScript is the cause of most accessibility, usability, performance and security issues in modern webapps and its use is discouraged by all reputable experts. This plugin can remove this problem from all of your projects.

Examples of valid code

✅

✅

// This is not executable code

✅

Examples of invalid code

const x = 4;

❌ Unexpected JavaScript

console.log("example")

❌ Unexpected JavaScript

function test() {
    let y = 2;
    return y;
}

test();

❌ Unexpected JavaScript

Usage

Install the package, and eslint itself:

npm install eslint eslint-no-javascript

You will not need any other eslint plugins, since all code they reject would be rejected by eslint-no-javascript, or indeed any other dependencies at all, since you will not be allowed to import them.

Add the package to your eslint.config.js file:

const noJs = require("eslint-no-javascript");

module.exports = [
    {
        files: ["**/*.js"],
        ignores: ["eslint.config.js"],
        languageOptions: {
            sourceType: "commonjs",
            ecmaVersion: "latest"
        },
        plugins: { "eslint-no-javascript": noJs },
        rules: {
            "eslint-no-javascript/no-javascript": "error"
        }
    }
];

Make sure to exclude eslint.config.js from the linter, or else eslint will delete its own configuration file.

Run eslint to check if you have used any JavaScript, and if you have then use eslint --fix to remove it.