Different indentation for "continuation indents/wrapped lines"

[dvlato]

Many style guides set a different indentation (eg. *2 tabWidth) for wrapped lines/ continuation indents; since Prettier does not want any new configurable option; Could we please add a different default for continuation indents?

See the prettier example, where I would like "this.line.is.very.long()" and "bodyOfBlock()" to have different indentation:

Prettier 2.5.0
Playground link

--parser babel
--arrow-parens avoid
--trailing-comma none

Input:

if (this.line.is.very.long()
  && more.code.here(running + out, ofIdeas, wrapAlready)) {
  bodyOfBlock();
}
const similarilyAssumingLongVariableNames =
  someValue;

Output:

if (
  this.line.is.very.long() &&
  more.code.here(running + out, ofIdeas, wrapAlready)
) {
  bodyOfBlock();
}
const similarilyAssumingLongVariableNames = someValue;

Expected behavior:

if (
    this.line.is.very.long() &&
    more.code.here(running + out, ofIdeas, wrapAlready)
) {
  bodyOfBlock();
}

Elements inside the IF block have a 4 character indentation instead of the 2 for "bodyOfBlock()"

[alexander-akait]

Sorry, we don't want to add more options, please read https://prettier.io/docs/en/option-philosophy.html

[James-Richardson]

The Google Style Guide says that continuation indents should be 4 spaces: https://google.github.io/styleguide/jsguide.html#formatting-indent.

And in my experience, having a continuation indent that's twice the normal indent is common enough that I considered it a de facto standard.

Can you please explain why Prettier necessarily sets the continuation indent to 2 spaces instead of 4?

Is it a preference of Prettier users?

Is the industry as a whole moving to 2 space continuation indents?

Is it an oversight in Prettier that has gone uncorrected for so long that it is now too late to change it?

Or does no one know why the continuation indent in Prettier is 2 spaces, it just is?