ESLint - "window" is not defined. How to allow global variables in package.json

There is a builtin environment: browser that includes window.

Example .eslintrc.json:

"env": {
    "browser": true,
    "node": true,
    "jasmine": true
  },

More information: https://eslint.org/docs/user-guide/configuring/language-options#specifying-environments

Also see the package.json answer by chevin99 below.

Add .eslintrc in the project root.

{
  "globals": {
    "document": true,
    "foo": true,
    "window": true
  }
}

I found it on this page: http://eslint.org/docs/user-guide/configuring

In package.json, this works:

"eslintConfig": {
  "globals": {
    "window": true
  }
}