When I use this comment with the following code, it reformats the code:

/*eslint object-property-newline: "error"*/
const obj1 = { foo: 'foo', bar: 'bar', baz: 'baz' };

However, when I add this line to my ESLint RC file instead, it doesn't reformat, while other rules seems to apply.

rules: {
    'object-property-newline': 'error', 
    'other rules': 'warn',
    // ...
}

Does anyone have an idea?

Edit - For example, this rule does apply:

'object-curly-newline': ["error", "always"],

If I add this code:

var x = { xs: 1, xy: 2, greg: 3 };

And save the file, it changes to:

const x = {
  xs: 1, xy: 2, greg: 3,
};

But I want every object property on a new line, which I hope to achieve with 'object-property-newline': 'error',.

https://eslint.org/docs/rules/object-property-newline