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util: if present, fallback to toString using the %s formatter #27621

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util: if present, fallback to toString using the %s formatter #27621

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@BridgeAR BridgeAR commented May 9, 2019

This makes sure that util.format uses String to stringify an object
in case the object has an own property named toString with type
function. That way objects that do not have such function are still
inspected using util.inspect and the old behavior is preserved as
well.

Refs: jestjs/jest#8443

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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Lite-CI: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/3471

@nodejs-github-bot nodejs-github-bot added the util Issues and PRs related to the built-in util module. label May 9, 2019
@BridgeAR BridgeAR added the review wanted PRs that need reviews. label May 10, 2019
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@nodejs/util PTAL

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CI: https://ci.nodejs.org/job/node-test-pull-request/23028/

Fishrock123
Fishrock123 reviewed May 10, 2019
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Change seems reasonable to me otherwise, pending Anna's comments.

doc/api/util.md Outdated Show resolved Hide resolved
@BridgeAR BridgeAR requested review from addaleax and Fishrock123 May 12, 2019 20:19
@BridgeAR BridgeAR force-pushed the odd-to-string-behavior branch from 72e1b7e to 9700e97 Compare May 13, 2019 22:38
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CI: https://ci.nodejs.org/job/node-test-pull-request/23099/

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@nodejs/util PTAL

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silverwind approved these changes May 15, 2019
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LGTM but can you explain why we don't move this check to util.inspect?

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@silverwind that would be quite a big breaking change and I doubt that we actually profit from that. It reminds me of our original inspect property. This case is of course a bit different because it's from the language itself but util.inspect is supposed not to trigger any side effects while inspecting the object and it should return the "true" value in case our custom inspect function is not used. Otherwise the original custom inspection could have just been to check for toString.
Neither Chrome or Firefox do this either. They behave similar to our current util.inspect. In fact, Chrome actually does not even fall back to toString when using the %s formatter (Firefox does).

The reason why I opened this PR is to keep the behavior backwards compatible (using toString was the default before 12.x) and because the console spec defines this behavior (but the spec fell behind the actual Browser implementations and they often deviate from the spec and also from each other. We also deviate from it in cases where it seems useful, BigInt for example).

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label May 15, 2019
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@nodejs/util PTAL. This could use another review.

BridgeAR added 2 commits May 16, 2019 15:40
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doc: update util.format formatters documentation
6402452 
This includes the information that some inputs are handled
differently than others (e.g., `Symbols` are partially represented
as `NaN`).
@BridgeAR
util: if present, fallback to toString using the %s formatter
0bb8a7f 
This makes sure that `util.format` uses `String` to stringify an object
in case the object has an own property named `toString` with type
`function`. That way objects that do not have such function are still
inspected using `util.inspect` and the old behavior is preserved as
well.
@BridgeAR BridgeAR force-pushed the odd-to-string-behavior branch from 9700e97 to 0bb8a7f Compare May 16, 2019 13:43
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Rebased due to a92ad36.

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CI: https://ci.nodejs.org/job/node-test-pull-request/23142/

BridgeAR added a commit to BridgeAR/node that referenced this pull request May 20, 2019
@BridgeAR
doc: update util.format formatters documentation
182b48a 
This includes the information that some inputs are handled
differently than others (e.g., `Symbols` are partially represented
as `NaN`).

PR-URL: nodejs#27621
Reviewed-By: Roman Reiss <[email protected]>
BridgeAR added a commit to BridgeAR/node that referenced this pull request May 20, 2019
@BridgeAR
util: if present, fallback to toString using the %s formatter
5518664 
This makes sure that `util.format` uses `String` to stringify an object
in case the object has an own property named `toString` with type
`function`. That way objects that do not have such function are still
inspected using `util.inspect` and the old behavior is preserved as
well.

PR-URL: nodejs#27621
Refs: jestjs/jest#8443
Reviewed-By: Roman Reiss <[email protected]>
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Landed in 182b48a and 5518664 🎉

@BridgeAR BridgeAR closed this May 20, 2019
targos pushed a commit that referenced this pull request May 20, 2019
@BridgeAR @targos
doc: update util.format formatters documentation
378f44c 
This includes the information that some inputs are handled
differently than others (e.g., `Symbols` are partially represented
as `NaN`).

PR-URL: #27621
Reviewed-By: Roman Reiss <[email protected]>
targos pushed a commit that referenced this pull request May 20, 2019
@BridgeAR @targos
util: if present, fallback to toString using the %s formatter
10b4a81 
This makes sure that `util.format` uses `String` to stringify an object
in case the object has an own property named `toString` with type
`function`. That way objects that do not have such function are still
inspected using `util.inspect` and the old behavior is preserved as
well.

PR-URL: #27621
Refs: jestjs/jest#8443
Reviewed-By: Roman Reiss <[email protected]>
@BridgeAR BridgeAR mentioned this pull request May 21, 2019
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@addaleax addaleax mentioned this pull request Aug 27, 2019
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@cpcallen cpcallen mentioned this pull request Nov 8, 2019
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@BridgeAR BridgeAR deleted the odd-to-string-behavior branch January 20, 2020 12:04
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@silverwind silverwind silverwind approved these changes

@addaleax addaleax Awaiting requested review from addaleax

@Fishrock123 Fishrock123 Awaiting requested review from Fishrock123

@antsmartian antsmartian Awaiting requested review from antsmartian

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