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Proposal: change no-redeclare default behavior #11405

mysticatea opened this issue Feb 16, 2019 · 2 comments


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commented Feb 16, 2019

What rule do you want to change?

Does this change cause the rule to produce more or fewer warnings?

  • More Warnings.

How will the change be implemented? (New option, new default behavior, etc.)?

  • It changes the default value of builtinGlobals option to true.

Please provide some example code that this change will affect:

/*eslint-env browser */
/*eslint no-redeclare: error */

var top = 100

What does the rule currently do for this code?

What will the rule do after it's changed?

Are you willing to submit a pull request to implement this change?



  • We cannot redeclare the top variable, browsers ignore the var top declaration silently. This can cause confusion and I believe that it's worth to warn by default.
  • Originate no-undef rule had warned redeclarations of globals by default, but it was removed in #4504. I think that we can re-enable it on no-redeclare rule.

@mysticatea mysticatea added this to Needs discussion in v6.0.0 Feb 16, 2019

@mysticatea mysticatea self-assigned this Feb 16, 2019


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commented Feb 16, 2019

👍 Yes! This is a sensible default. My guess is we had to implement the option with a default disabled state so it wasn't a breaking change, but we should absolutely change this in the next major release.

@nzakas nzakas added accepted and removed evaluating labels Feb 28, 2019

@nzakas nzakas moved this from Needs discussion to Accepted, ready to implement in v6.0.0 Feb 28, 2019


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commented Mar 1, 2019

This issue was accepted in today's TSC meeting.

mysticatea added a commit that referenced this issue Mar 15, 2019

@mysticatea mysticatea moved this from Accepted, ready to implement to Implemented, pending review in v6.0.0 Mar 15, 2019

v6.0.0 automation moved this from Implemented, pending review to Done Apr 25, 2019

mysticatea added a commit that referenced this issue Apr 25, 2019

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