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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Justin Fagnani‏ @justinfagnani 13 Feb 2019
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      I don't understand what actual concrete benefit there is to using .mjs on client-side JavaScript modules. It seems to only cause problems with tools that .js completely avoids. What's the specific upside?

      18 replies 1 retweet 45 likes
    2. Adam Bradford‏ @admbradford 13 Feb 2019
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      Replying to @justinfagnani

      Really I think there’s two benefits to using .mjs ext - 1> Understanding what you’re working on in development 2> it follows the node.js experimental module pattern.

      2 replies 0 retweets 1 like
    3. Justin Fagnani‏ @justinfagnani 13 Feb 2019
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      Replying to @admbradford

      I don't see anything concrete in there. All my source is modules already, and that's true for the projects I've seen that use .mjs. There's no mixing. Node doesn't matter for client-side libraries, nor does it support modules yet, even with .mjs.

      2 replies 0 retweets 2 likes
    4. Rob Palmer‏ @robpalmer2 13 Feb 2019
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      Replying to @justinfagnani @admbradford

      It sounds like you are self-selecting out of the set of people with use-cases for mjs, because your codebase is 100% converted to ESM. That's awesome and I wish more people achieved that goal. There's no need to imply that this means no one else has the use-case.

      1 reply 0 retweets 3 likes
    5. Justin Fagnani‏ @justinfagnani 13 Feb 2019
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      Replying to @robpalmer2 @admbradford

      Well, I haven't seen a mixed modules and non-modules client-side codebase yet. They must be a rare bird.

      3 replies 0 retweets 3 likes
    6. Rob Palmer‏ @robpalmer2 13 Feb 2019
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      Replying to @justinfagnani @admbradford

      It's already established the grammar is ambiguous. Assume a single file app consisting of an index.js file and ambiguous contents. Clearly there's no mixing going on. Maybe I wish to signal to Node, my users, my linter or my future self how it should be parsed.

      1 reply 0 retweets 1 like
    7. Mike Sherov (he/him)  🚀‏ @mikesherov 13 Feb 2019
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      Replying to @robpalmer2 @justinfagnani @admbradford

      Everyone touts this case of “ambiguous file that is run from command line” as evidence of the need for .mjs. Instead of inventing new mime types and ietf standardization, we could’ve just had .js modules in Node with the caveat of ambiguous single file is a script. Oh well!

      1 reply 0 retweets 2 likes
      Mathias Bynens‏Verified account @mathias 14 Feb 2019
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      Replying to @mikesherov @robpalmer2 and

      It’s not just about ambiguous files that are run from the command line, though. Recommended reading:https://medium.com/@bradleymeck/understanding-the-hard-choice-1ea3008fc9d0 …

      5:31 AM - 14 Feb 2019
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Mike Sherov (he/him)  🚀‏ @mikesherov 14 Feb 2019
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          Replying to @mathias @robpalmer2 and

          Read it before. Thanks for linking. use-strict is false equivalence. That flag changed meaning of every file. Smallest incr. change could’ve been: 1. Entry point gets parsed as script, fallback to module. (module cache would amortize cost) 2. import = module 3. require = node

          2 replies 0 retweets 0 likes
        3. Mathias Bynens‏Verified account @mathias 14 Feb 2019
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          Replying to @mikesherov @robpalmer2 and

          Step 1 means potentially having to re-parse, which seems bad. Regardless of what Node.js decided way back then, every single piece of tooling would then have to implement that change, and get it exactly right. It seems much simpler to just look for a file extension.

          1 reply 0 retweets 0 likes
        4. 6 more replies
        1. Yehuda Katz  🥨‏Verified account @wycats 14 Feb 2019
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          Replying to @mathias @mikesherov and

          This is a somewhat old debate at this point and you're reiterating arguments that many of us disagreed with as if they're self-evident. Would be happy to take this private 😀

          0 replies 0 retweets 2 likes
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