Rule proposal: `prefer-logical-nullish-assignment`

I searched and didn’t see something like that requested…

Please describe what the rule should do:

if (x == null) {
  x = 1;
}

Could be rewritten as:

x ??= 1;

What new ECMAScript feature does this rule relate to?

Logical nullish assignment.

What category of rule is this? (place an “X” next to just one item)

[ ] Warns about a potential error (problem) [x] Suggests an alternate way of doing something (suggestion) [ ] Other (please specify:)

Provide 2-3 code examples that this rule will warn about:

if (x.y == null) {
  x.y = 1;
}

const object = {};
if (!('x' in object)) {
  object.x = [];
}

Why should this rule be included in ESLint (instead of a plugin)?

Because it improves JS code by using core JS features.

Are you willing to submit a pull request to implement this rule?

No.

[btmills]

We have operator-shorthand for the mathematical operators. Would #13689 cover the logical operator request here?

[btmills]

Closing to combine into #13689. If you’ve left a 👍 here, feel free to add one there as well.