util: pass on additional error() args #4279
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| @@ -18,7 +18,11 @@ exports.printDeprecationMessage = function(msg, warned) { | |||
| }; | |||
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| exports.error = function(msg) { | |||
| console.error(`${prefix}${msg}`); | |||
| if (arguments.length > 1) { | |||
| arguments[0] = `${prefix}${msg}`; | |||
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It probably doesn't really matter here but V8 doesn't like it when you modify arguments.
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I thought so too, but according to @petkaantonov's "Optimization killers" page it doesn't apply if the script/function is in strict mode?
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I checked and Crankshaft bails out with 'Bad value context for arguments value' as the deopt reason; TurboFan seems to be able to optimize it, though.
If writing it like this is unavoidable, I'd at least DRY the formatting into const fmt = ${prefix}${msg};
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Would cloning arguments and mutating that instead be better?
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personally I'd be more comfortable with that.
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| const args = new Array(arguments.length); | ||
| args[0] = fmt; | ||
| for (let i = 1; i < arguments.length; ++i) | ||
| args[i] = arguments[i]; |
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why not simply Array.prototype.slice.call(arguments) then args[0] = fmt after?
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Because (AFAIK this is still the case) passing arguments to a function other than fn.apply() causes deopts in v8.
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ah.. right, keep forgetting about that. carry on then :-)
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Are we avoiding [...arguments] (or function (...rest) args) to make the LTS backporting process easier?
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Well if for no other reason than I think spread is slow in v8 still? I am not 100% sure if that changed in v8 4.7 or not...
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LGTM |
This fixes breakage introduced in 94b9948 when writing the max EventEmitter listeners warning to stderr.
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CI is all green except unrelated, flaky tests: https://ci.nodejs.org/job/node-test-pull-request/1000/ |
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Gnarly but LGTM. |
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Landed in 0b43c08. |
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The referenced commit that is broken 94b9948 is a semver Major change not in the v4.x branch |
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As this commit has a dont-land-on-v5.x I'm assuming the same is true for v4.x adding the appropriate label |
This fixes breakage introduced in 94b9948 when writing the max EventEmitter listeners warning to stderr. PR-URL: nodejs#4279 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
This fixes breakage introduced in 94b9948 when writing the max EventEmitter listeners warning to stderr.