Combine multiple assignments into array assignment (and inverse)

[qpwo]

Is this request related to a problem? Please describe.

I was going to ask for "combine multiple conditional assignments into one assignment" because that's my specific task:

// before:
const a = x === 1 ? 3 : 5
const b = x === 1 ? 7: 11
// after:
const [a, b] = x === 1 ? [3, 7] : [5, 11]

But it occured to me that a more general "combine assignments into array assignment" (and ideally its inverse) could make the above task easy enough, and be easier to implement.

Describe the solution you'd like

Select assignments and combine them into one array assignment. Select an array assignment and break it into multiple assignments/declarations.

Additional context

(This is just another wish on my wish-list. Abracadabra is awesome as-is.)

See also #362