I cannot delete warnings from Eslint

Question

I am learning React-Native, I have never had much experience with Javascript, I have installed the Eslint extension and I am trying to follow the line looking for the best syntax.

But there are two warnings I couldn’t get rid of and I can’t understand why.

The first every time I put one alert() no matter the content

[eslint] 'alert' is not defined. (no-undef)
function alert(message?: any): void

The second no require

<Image source={require('./imgs/logo.png')} />

Also no matter the content

[eslint] Unexpected require(). (global-require)
function require(name: string): any

The app works ok even with these warnings but would like to understand them

Answer 1

In Eslint you have a configuration file, then you can tell Eslint the environments you work for it to have some global variables like alert and require (*).

Thus, in the configuration file .eslintrc.js put whatever you need:

env: {
    browser: true,
    commonjs: true,
    es6: true,
    node: true
},

* - _{see documentation here}