Prettier: Multiple comments on top of if statement get separated

[timm-gs]

When adding explanatory comments after Istanbul comments, prettier moves them around into a basically unformatted state.

Prettier 1.7.4
Playground link

Input:

  const x = 0;

  /* istanbul ignore if */ // debug case currently not triggered
  if (true) {
    x;
  }

Output:

const x = 0; // debug case currently not triggered

/* istanbul ignore if */ if (true) {
  x;
}

Expected behavior:

I would expect the following output to remain unchanged with regards to the comments:

  const x = 0;

  /* istanbul ignore if */ // debug case currently not triggered
  if (true) {
    x;
  }

I would expect the comments to stick to the if, where they must be for Istanbul to pick them up

[lydell]

You can move the line comment above the block comment as a workaround.

Prettier 1.7.4
Playground link

Input:

  const x = 0;

  // debug case currently not triggered
  /* istanbul ignore if */
  if (true) {
    x;
  }

Output:

const x = 0;

// debug case currently not triggered
/* istanbul ignore if */
if (true) {
  x;
}