Is there a way to preserve the file as-is and do not autoformat at all?

[frydj]

Trying to use this because it's already working, but I need to preserve the line numbers as they actually exist in the file. Is there any recommended way to do this? Using mainly for React JS files.

[panoply]

In this release, you can leverage ignore comments:

// parse-ignore-start 
function () {}
// parse-ignore-end 

[frydj]

@panoply thanks for your answer! this seems to get closer, but not quite identical.

I'm comparing 2 files side by side using "diff"; certain things are preventing it from having 100% line match. For example, in my file the closing button tag </button> is on it's own line (formatted using prettier), but in the prettydiff comparison the </button> is not on its own line, and also has an extra space so looks like < /button>.

[panoply]

Likey a defect pertaining in the markup lexer which happens when handling JSX. Prettier and PrettyDiff handle input in vastly different manners, PrettyDiff generates a data structure whereas Prettier is working with external parsers to product an AST. Sparser is what is producing the structures in PrettyDiff.

Based on the work I have done in Prettify (FYI: Diffing is not available in Prettify), I can say with certainty there are several defects pertaining to JSX processing and resulting output. It's hard to give you a definitive or solution tbh.

You could also try block comments /* parse-ignore-start */.

[frydj]

@panoply I thought about what you said before ... what I had done previously was wrap my prettydiff() function with the comments. What I changed it to now was to actually inject the string "// parse-ignore-start" (and end) into my diff/source objects.

now I'm really close - the only problem is that it isn't enforcing the line's character limit (120 characters) ... so off by a few lines. trying to find a way to enforce this but not parse anything else. I appreciate your help on this!

[panoply]

You need to set wrap limit, eg:

prettydiff.options.wrap = 120
prettydiff()

Bare in mind that Prettier might be problem here and not PrettyDiff. Prettier defaults to a 80 character word wrap.