Deterministic Output

[thechriswalker]

I haven't found a way of doing this, nor an issue regarding it - so I may be in the minority here. I love the idea of prettier, and have always loved go fmt for the same reasons - but the Golang tool takes it a step further and I am looking for a tool to emulate this in the JS ecosystem.

The idea is that for a given source AST, irrespective of source formatting, we get a given output. Currently prettier allows the source formatting to inform the output formatting.

I kinda want this to completely eliminate any author style on the resultant code, but have prettier enforce all style decisions.

The simplest example I can think of is the following, where the 2 declarations could each fit on a single line, but prettier does not force the first one to be a one-liner.

Prettier 1.19.1
Playground link

--parser babel

Input:

const obj1 = {
  a: 1
}

const obj2 = { a: 1};

Output:

const obj1 = {
  a: 1
};

const obj2 = { a: 1 };

Example deterministic behavior:

const obj1 = { a: 1 };
const obj2 = { a: 1 };

[alexander-akait]

It is expected, because we repsect user input in some cases, you need the --pure option. Duplicate of #2068