Eslint: how to force multiline object literals and arrays to have the same indent?

Question

Eg these should be allowed:

{ a: 1, b: 2, c: 3 };

{
  a: 1,
  b: 2,
  c: 3,
};

{
  a: 1, b: 2, c: 3,
};

[
  1,
  2,
  3,
];

These should not be allowed:

{ a: 1,
  b: 2,
  c: 3,
};

{
  a: 1, b: 2,
  c: 3,
};

I added "object-property-newline": [2, { allowAllPropertiesOnSameLine: true }], , but it's still allowing the 2 examples. I also tried several key-spacing options but it doesn't do what I want. How do I disallow the last 2 examples?

Answer 1

The first example is covered by another rule object-curly-newline :

/* eslint object-curly-newline: 2 */

let foo = { a: 1,
  b: 2,
  c: 3,
};

// Unexpected line break before this closing brace. (object-curly-newline)

The second example works on my computer.

You can check it in this demo .