eslint-plugin-no-excess-properties

ESLint plugin for TypeScript that warns when there are excess properties on object literals

Currently has a single rule no-excess-properties/object-literal that uses typed linting

Install

npm install --save-dev eslint-plugin-no-excess-properties

Config

In the eslint.config.mjs file:

Basic

import { defineConfig } from "eslint/config";
import noExcessProperties from "eslint-plugin-no-excess-properties";

export default defineConfig({
  extends: [
    noExcessProperties.configs.recommended,
  ],
})

Fancy

import { defineConfig } from "eslint/config";
import noExcessProperties from "eslint-plugin-no-excess-properties";

export default defineConfig({
  plugins: {
    "no-excess-properties": noExcessProperties,
  },
  rules: {
    "no-excess-properties/object-literal": "error",
  },
})

Example Linted Code

See the test file for more examples

Incorrect

let test1: { prop1: number; } = { prop1: 1 };
const test2 = { prop1: 2, extraPropertyNotInTest1: 3 };
test1 = test2; // Error

Correct

let test1: { prop1: number; } = { prop1: 1 };
const test2 = { prop1: 2 };
test1 = test2; // OK

More Info

Related typescript-eslint issue: https://github.com/typescript-eslint/typescript-eslint/issues/10234

Feedback

Submit bug reports and other feedback in the issues section

License

MIT