Status of reversibility solution

[nullromo]

Background

Prettier still isn't fully "deterministic." Running identical-except-for-whitespace files through Prettier with the same options should always yield the same results. The Rationale pages calls this "reversibility." It also states:

the team is still looking for heuristics that would allow either to remove this behavior completely or at least to reduce the number of situations where it’s applied

with regard to the problem of object literals not being reversible.

Question

I haven't seen anything about the progress of this in the issues, so my question is, what is the current status? Will this problem ever be solved? Since adding new options/modes to Prettier is not allowed, what is the team working on that will allow for Prettier to finally become fully deterministic?

Example

For completeness, here's an explicit example of the problem.

Input 1:

const x = { y:
0 };

Output 1:

const x = { y: 0 };

Input 2:

const x = {
y: 0 };

Output 2:

const x = {
    y: 0,
};

Expected behavior:

Since inputs 1 and 2 are syntactically identical, outputs 1 and 2 should be exactly the same. I don't even care what the outputs look like (that's for my fancy opinionated formatter to decide), as long as they are the same. I want my opinionated formatter to have more opinions! Don't make/let me decide how my object literals should look.

[sosukesuzuki]

As you can see on the rational page, we recognize this as an issue. However, as far as I know, no contributor is currently actively working on this.

[thorn0]

Duplicate of #2068