--- description: 'Disallow unnecessary assignment of constructor property parameter.' --- import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; > 🛑 This file is source code, not the primary documentation location! 🛑 > > See **https://typescript-eslint.io/rules/no-unnecessary-parameter-property-assignment** for documentation. [TypeScript's parameter properties](https://www.typescriptlang.org/docs/handbook/2/classes.html#parameter-properties) allow creating and initializing a member in one place. Therefore, in most cases, it is not necessary to assign parameter properties of the same name to members within a constructor. ## Examples ```ts class Foo { constructor(public bar: string) { this.bar = bar; } } ``` ```ts class Foo { constructor(public bar: string) {} } ``` ## When Not To Use It If you don't use parameter properties, you can ignore this rule.