Improve prettifier documentation

[felixheck]

Hi there!

AFAIK, since the v5 release and the integration of pretty-pino the prettyPrint.formatter option is useless.

Is there an easy way to migrate the prettyPrint.formatter option to v5 though? 😔

Cheers!

[mcollina]

what do you mean?

[felixheck]

There was a prettyPrint.formatter option in pino <=4 — this option is not available because pino-pretty doesn’t support such option.

And since I try to stay up to date, I’m looking for an alternative way to format the output.

[mcollina]

Oh, we have internalized that functionality and forgot to write the docs: #478.

[mcollina]

Actually there is non-documented (mistake) API https://github.com/pinojs/pino/blob/master/lib/tools.js#L159-L170. passing a prettifier function would do the same function of prettyPrint.formatter.

Would you like to help and figure out the docs?

[felixheck]

Ah awesome 🙌🏼
Gonna try to fire a PR tomorrow in the plane — otherwise after my holiday 😊

Thanks Matteo!

[jsumners]

Yes it is documented -- http://getpino.io/#/docs/pretty?id=prettifier-api

[mcollina]

I think we can do a bit better, the example is not really self-explanatory.

The reference implementation of such a module is the pino-pretty module. To learn more about creating a custom prettifier module, refer to the pino-pretty source code.

We can actually explain this.

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