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sebmck's profile
Sebastian
Sebastian
Sebastian
Verified account
@sebmck

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SebastianVerified account

@sebmck

JavaScript boy and “lovely thoughtleader” ⌨️ he/him ♂️

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Joined April 2011

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    1. Dan Abramov‏ @dan_abramov 24 May 2019
      • Report Tweet
      • Report NetzDG Violation

      When writing Babel plugins, what can I assume about the same node being processed more than once? When or how can this happen? What are common protections if I don't want my annotations to appear twice? Should I always check if I've "seen" this node already?

      4 replies 2 retweets 34 likes
    2. Sebastian‏Verified account @sebmck 24 May 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @dan_abramov

      You should always check if you’ve seen it. A WeakSet is the best option. There’s literally no memorable logic between when nodes are retraversed.

      2 replies 0 retweets 9 likes
    3. Sagiv Ben Giat‏ @sag1v 24 May 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @sebmck @dan_abramov

      @sebmck what scenario will get you to process the same node again?

      2 replies 0 retweets 0 likes
    4. Sebastian‏Verified account @sebmck 24 May 2019
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      Replying to @sag1v @dan_abramov

      Another plugin replacing a parent will trigger a retraversal of the subtree, running your visitor again. There’s other scenarios. I’ll look into it and get some code pointers when I can.

      2 replies 0 retweets 1 like
    5. Dan Abramov‏ @dan_abramov 24 May 2019
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      Replying to @sebmck @sag1v

      Does this look legit? https://github.com/facebook/react/pull/15733/commits/f6881a8e74b4a47f0916ebf64682d8467dc86ef2 …

      2 replies 1 retweet 2 likes
      Sebastian‏Verified account @sebmck 24 May 2019
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      Replying to @dan_abramov @sag1v

      Yeah looks legit. Same pattern is used in the "official" Babel plugins: https://github.com/babel/babel/blob/8c7d4b55c99ff34cb9d493d452472e59b5ed1e70/packages/babel-plugin-transform-react-constant-elements/src/index.js#L85-L86 … etc

      2:41 PM - 24 May 2019
      • 1 Retweet
      • 2 Likes
      • Jacob M-G Evans ⚛ Dan Abramov
      0 replies 1 retweet 2 likes

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