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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. james padolsey‏ @padolsey 19 Jul 2019
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      james padolsey Retweeted james padolsey

      I'm still struggling with this. Does *anyone* know where, in the wild, Module Environments (a type of Lexical Environment) exist?https://twitter.com/padolsey/status/1151148086812696576 …

      james padolsey added,

      james padolsey @padolsey
      The ES spec makes reference to a ModuleEnvironment. Does anyone know whether this is used in Node.js? I know Node.js uses some weird invisible wrapping IIFE thing around modules but I'm also curious whether this itself is within a "Module Environment" from the ES spec's POV?
      1 reply 1 retweet 2 likes
    2. Mathias Bynens‏Verified account @mathias 19 Jul 2019
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      Replying to @padolsey

      ModuleEnvironment is an abstract spec concept. It doesn’t “exist” in implementations in that there is no user-accessible object that directly corresponds to the concept.

      1 reply 0 retweets 0 likes
    3. james padolsey‏ @padolsey 19 Jul 2019
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      Replying to @mathias

      Am I right to presume that it would "exist" as a true scope (i.e. an accessible lexical environment in which we could declare things) in Node.js if Node didn't do that weird module wrapping thing as per https://nodejs.org/api/modules.html#modules_the_module_wrapper … ?

      2 replies 0 retweets 0 likes
    4. james padolsey‏ @padolsey 19 Jul 2019
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      Replying to @padolsey @mathias

      And yep to clarify when I say "exists" I mean in terms of talking about the current scope. Like in normal <script>s you'd say "I'm defining stuff in the global scope", while in Node you'd say "I'm defining stuff in the module scope" (Tho in Node it's really just a func scope...)

      1 reply 0 retweets 0 likes
    5. Jake Archibald‏ @jaffathecake 19 Jul 2019
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      Replying to @padolsey @mathias

      There's also <script type="module">, but yeah it seems to feel exactly like a function scope.

      1 reply 0 retweets 1 like
    6. james padolsey‏ @padolsey 19 Jul 2019
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      Replying to @jaffathecake @mathias

      ahhhhh I totally missed this.

      1 reply 0 retweets 0 likes
    7. Mathias Bynens‏Verified account @mathias 19 Jul 2019
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      Replying to @padolsey @jaffathecake

      The module scope lives within the global scope. I tried to visualize it here: https://mathiasbynens.be/notes/globalthis#terminology … In Node.js… ➡️ a classic script is wrapped and then run in the global scope ➡️ a module is wrapped and then run in the module scope

      2 replies 0 retweets 2 likes
    8. Mathias Bynens‏Verified account @mathias 19 Jul 2019
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      Replying to @mathias @padolsey @jaffathecake

      At least, this is how it works in JS engine binaries that don’t do Node.js-style wrapping. cc @guybedford @bradleymeck @ljharb @MylesBorins to correct me on the above

      1 reply 0 retweets 0 likes
    9. Jake Archibald‏ @jaffathecake 19 Jul 2019
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      Replying to @mathias @padolsey and

      There's also <script>const foo = 'bar'</script> which exists on the global scope but not the global object, right?

      1 reply 0 retweets 4 likes
    10. Mathias Bynens‏Verified account @mathias 19 Jul 2019
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      Replying to @jaffathecake @padolsey and

      const/let/class create lexical bindings, so in your example the binding exists in the “top-level lexical scope”, which I see as distinct from the global scope.

      2 replies 0 retweets 3 likes
      Mathias Bynens‏Verified account @mathias 19 Jul 2019
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      Replying to @mathias @jaffathecake and

      The other side of this is that <script type=module> var foo = 42; </script> doesn’t create http://globalThis.foo , because of the module scope. https://v8.dev/features/modules#intro …

      5:56 AM - 19 Jul 2019
      • 2 Retweets
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      • Amardeep Bhowmick rong-sen Paul Melero Masataka Yakura Vlad Coroiu Mehul Mohan Bradley Farias Jake Archibald Christopher Cook
      0 replies 2 retweets 9 likes

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