v4.x: backport util.inspect.custom #9688
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Add a `util.inspect.custom` Symbol which can be used to customize `util.inspect()` output. Providing `obj[util.inspect.custom]` works like providing `obj.inspect`, except that the former allows avoiding name clashes with other `inspect()` methods. Fixes: nodejs#8071 PR-URL: nodejs#8174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
If a custom inspection function returned `this`, use that value for further formatting instead of going into infinite recursion. This is particularly useful when combined with `util.inspect.custom` because returning `this` from such a method makes it easy to have an `inspect()` function that is ignored by `util.inspect` without actually having to provide an alternative for custom inspection. PR-URL: nodejs#8174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
59714cb introduced the `util.inspect.custom` symbol, but it was exported as `customInspectSymbol` by `internal/util.js` and referenced as `inspectSymbol` by `buffer.js`. PR-URL: nodejs#9289 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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@thealphanerd What’s the process for this? Adding the |
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@MylesBorins This was cancelled on the last LTS meeting, right? If I’m understanding correctly, feel free to close |
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Good call! Closing |
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Checklist
make -j8 test(UNIX), orvcbuild test nosign(Windows) passesAffected core subsystem(s)
util
Description of change
Backport of #8174 (2 semver-minor commits) and #9289 to v4.x.
/cc @thealphanerd @nodejs/lts