Node V10 与 Node V11 中 util.format 的行为

Question

When I try to execute util.format with inspect as an object returning a function like

util.format({inspect: function() { return 1; } })

Node 10 output: '1'

Node 11 output: '{ inspect: [Function: inspect] }'

I couldn't find anything in the documentation in regards to using util.format having an inspect as key. I am not sure why the behaviour is different.

PS: Couldn't have REPL with a older version, so I couldn't attach a reproducible version. But running this code in different node version would show the logs as mentioned in the example.

Answer 1

Using this code in Node.js v10 gives:

(node:39468) [DEP0079] DeprecationWarning: Custom inspection function on Objects via.inspect() is deprecated

You should use util.inspect.custom instead of util.format See Deprecations