Node.js tools doesn't use color outputs because of wrong TTY detection

[ai]

Describe the bug

chalk is the most popular tool for color output in the Node.js ecosystem. Unfortunately, it can’t detect that GitHub Actions support color and use colorless output.

I created an issue and we found that Node.js does not detect TTY on stdout.

process.stdout.isTTY //=> undefined

As a result, we have less readable output in all npm tools.

Area for Triage: JavaScript and Node.js

Question, Bug, or Feature?: Bug

Virtual environments affected

• macOS 10.15
• Ubuntu 16.04 LTS
• Ubuntu 18.04 LTS
• Windows Server 2016 R2
• Windows Server 2019

Expected behavior

Color output for chalk based tools.

Actual behavior

1. Create empty index.js
2. Add npx size-limit index.js step
3. Check step output on the website: it has no colors.

[ai]

Auto assigning script was failed, so I will mention people manually. Sorry if I will mention somebody wrong:

@leantk @vijayma @bryanmacfarlane

[arcanis]

Yarn 2 is currently impacted as well. I'll use a workaround in the meantime, but I'll monitor these issues to add the right fix when possible 🙂

[bryanmacfarlane]

This may be an issue for actions/runner. @TingluoHuang and @dakale , is that correct?

[TingluoHuang]

@bryanmacfarlane yes, I think the issue already tracked
actions/runner#241

[kaylangan]

Closing in favor of tracking in actions/runner#241

[kirillgroshkov]

Jest doesn't output colors too