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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. Sebastian‏Verified account @sebmck 3 Jul 2019
      • Report Tweet
      • Report NetzDG Violation

      Local variable refinements are unsafe in TS and Flow. Both are bad, TS is the worst. Seems obvious in hindsight but neither handle local refinement invalidation correctly. I'm not speaking abstractly, this has caused bugs in my code before.

      4 replies 2 retweets 34 likes
      Show this thread
    2. Ryan Cavanaugh‏ @SeaRyanC 4 Jul 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @sebmck

      The real problem is that the "safe" assumption (if you can't see a function body, assume it changes everything) is also the one most likely to be wrong in practice -- function bodies you can't see *almost never* change locally-visible data

      2 replies 0 retweets 2 likes
    3. Sebastian‏Verified account @sebmck 4 Jul 2019
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      Replying to @SeaRyanC

      Dunno, I've found that TypeScript is way too loose. I never personally found a problem with refinment invalidation when writing code with Flow but I'm a masochistic and am fine writing weird code.

      1 reply 0 retweets 1 like
      Sebastian‏Verified account @sebmck 4 Jul 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @sebmck @SeaRyanC

      This is another case I ran into which I'm pretty sure is in the same class as refinement invalidation: https://www.typescriptlang.org/play/#code/MYGwhgzhAEBiD29oG8BQ1rHgOwgFwCcBXYPeAgCgEoV0No8ALASwgDoxTmA3AU2gC80AGZgQEXgG46AX1R1OeHrwBc0AEaIQvMNml0AJjq7cweXtVr0GLdouWCRYidIxy6zbMzyW01pqwcJvxChERS8v62bEb2pubU+tYA9MnQsSZmFjQSeNAABgF2wfkMSPmi4ryl6kR53gDkMPjMICDQALZgBADWvAbQkAVh1enhZTb8kBDMAObYHbzYeWCafHQYzMLQFEVBSnyCAkKVEjR+1pg4EPDabCDwsxQNRB0dDVSu9HJuqDJAA …

      12:33 PM - 4 Jul 2019
      • 1 Like
      • busticated pizza wolf
      0 replies 0 retweets 1 like

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