Line comment between function an opening brace

[fvictorio]

If you have the opening brace of a function on its own line, and a line comment after the function signature, the output of prettier is different if you run it once or twice.

Prettier 1.14.3
Playground link

--parser babylon

Input:

function foo() // this is a function
{
  return 42
}

Output:

function foo() { // this is a function
  return 42;
}

Second Output:

function foo() {
  // this is a function
  return 42;
}

[alexander-akait]

Unstable comment

[jaideng123]

I can work on this

[jaideng123]

Is the first output the expected behavior?

[alexander-akait]

@jaideng123 I think second output

[j-f1]

I’d expect the first output to be maintained, but either way works.

[jaideng123]

If I were reading this code it would seem more natural for the comment to be inline (or maybe even above the function declaration?)

[jaideng123]

After digging into this bug a little more I found another layer of instability:

Input:

function foo() 
// this is a function
{
  return 42
}

Output 1:

function foo() // this is a function
{
  return 42
}

Output 2:

function foo() { // this is a function
  return 42
}

Output 3:

function foo() {
  // this is a function
  return 42;
}

[alexander-akait]

@jaideng123 Just handle 1 and 2 variants