Pipe next dev into pino-pretty and keep colorized output?

[borekb]

We have a yarn dev script like this:

{
  "scripts": {
    "dev": "next | pino-pretty -t -c -s \"level > '30'\""
  }

The -c flag of pino-pretty means "colorize output", but I still don't see the colors:

Vs. plain next dev which is colorful:

Is it next CLI that's not sending the escape sequences when piped into pino-pretty?

[borekb]

BTW, some other CLIs have explicit flags for these situations, e.g., eslint --color. It's probably not the fault of the logging utility, see e.g. pinojs/pino#408.

I didn't find anything in the source codes of Next.js that would be detecting tty (except this single thing, which seems unrelated), but maybe it has to be supported explicitly.

[borekb]

The solution:

-"dev": "next | pino-pretty -t -s \"level > '30'\"",
+"dev": "FORCE_COLOR=true next | pino-pretty -t -c -s \"level > '30'\"",

FORCE_COLOR is an env var for chalk that Next.js uses.