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code frame formatting messed up when using colors #10159

devsnek opened this issue Jul 4, 2019 · 2 comments


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commented Jul 4, 2019

Bug Report

Current Behavior
Using color in code frames causes odd formatting

Input Code

function a(b, c) {
  return b + c;
`, {
  start: {
    line: 2,
    column: 1,
  end: {
    line: 4,
    column: 1,
}, {
  highlightCode: true,
  message: 'Message about things',

Expected behavior/code
Arrow formatting remains consistent


  • @babel/code-frame: 7.0.0

Possible Solution

Additional context/Screenshots

Input code from above with and without highlightCode:


P.S. it also seems that with the non-color output, the first line is 1 character short.


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commented Jul 4, 2019

Hey @devsnek! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
that typically always has someone willing to help. You can sign-up here
for an invite.


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commented Jul 4, 2019

We peobably are counting "hidden" ANSI codes, while we shouldn't.

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