AI-coding hygiene

no-placeholder-code

Flag `throw new Error("not implemented")` and TODO/FIXME stubs the AI left behind.

Catches the structural pattern `throw new <X>Error("not implemented" | "TODO" | "stub" | "placeholder" | "coming soon" | …)`. The fix is always the same: implement the function or remove the unreachable branch before shipping.

Behavior

• Fixable: No.
• Suggestions: No.

Examples

Bad:

export function chargeCustomer(amount) { throw new Error("not implemented"); }

Good:

export function chargeCustomer(amount) { return billingClient.charge(amount); }

Related rules

• no-floating-promise-handlerRequire try/catch (or an async wrapper) on async Express/Fastify route handlers.
• no-hardcoded-localhostFlag hardcoded `localhost`/`127.0.0.1`/`0.0.0.0` URLs that ship to production.
• no-unsafe-mass-assignmentFlag `Object.assign(user, req.body)` and `{ ...model, ...req.body }` shapes.

Use it

Enable no-placeholder-code in your eslint.config.js:

import deslint from '@deslint/eslint-plugin';

export default [
  {
    plugins: { deslint },
    rules: {
      'deslint/no-placeholder-code': 'error',
    },
  },
];

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