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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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    Mathias Bynens‏Verified account @mathias 18 Apr 2019
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    🔥 `globalThis` makes it easy to access the global `this` value in any JavaScript environment. 🤔 Surprisingly, polyfilling it correctly requires some arcane JavaScript wizardry. 🧙‍♀️ A horrifying globalThis polyfill in 100% universal JavaScript: https://mths.be/globalthis pic.twitter.com/3UNs7KnEzG

    5:29 AM - 18 Apr 2019
    • 325 Retweets
    • 1,022 Likes
    • #VoteBlue (@🏠) Blake Bowen Evan Salma Coin ShakeDown Abhishek Thakur Max Heiber Siyabonga_Dlamini Kagami S. Rosylight
    35 replies 325 retweets 1,022 likes
      1. New conversation
      2. James Browning‏ @jamesernator 18 Apr 2019
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        Replying to @mathias

        It looks like the spec doesn't mandate that the [[GlobalThisValue]] actually inherit from Object.prototype so this is *almost* universal but just not quite. It does make me wonder if a truly universal method exists or not. https://tc39.github.io/ecma262/#table-18 …

        1 reply 0 retweets 3 likes
      3. Mathias Bynens‏Verified account @mathias 18 Apr 2019
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        Replying to @jamesernator

        It does though, in the exact section you link to: “Hosts may provide any ECMAScript Object value.” And all objects inherit from %ObjectPrototype%.

        1 reply 0 retweets 1 like
      4. 6 more replies
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      2. Bernat Fortet Unanue‏ @bernatfortet 18 Apr 2019
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        Replying to @mathias

        What are some uses for globalThis ?

        1 reply 0 retweets 1 like
      3. Mathias Bynens‏Verified account @mathias 18 Apr 2019
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        Replying to @bernatfortet

        Not that many use cases. Mostly useful for polyfills that need access to the global `this` for some reason. @ljharb

        1 reply 0 retweets 2 likes
      4. 2 more replies
      1. New conversation
      2. 𝓼𝓮𝓻𝓪𝓹𝓪𝓽𝓱 【ツ】 ☮( 📍 🇬🇧)‏ @serapath 18 Apr 2019
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        Replying to @mathias

        So `__magic__` is `this`, which i guess will always be window? then `__magic__.globalThis = __magic` essentially says `window.globalThis = window` ...and once it's set, you can delete `__magic__` sounds overly complicated

        2 replies 0 retweets 1 like
      3. Mathias Bynens‏Verified account @mathias 18 Apr 2019
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        Replying to @serapath

        Importantly, `__magic__` is the global `this` (not just any `this`). If you know of an easier way to polyfill `globalThis` under the constraints mentioned in the article, I’d love to hear it.

        1 reply 0 retweets 2 likes
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      2. Michael Rawlings‏ @mlrawlings 19 Apr 2019
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        Replying to @mathias

        I broke it 🙈pic.twitter.com/G5tTrCq9Hh

        1 reply 0 retweets 5 likes
      3. Mathias Bynens‏Verified account @mathias 20 Apr 2019
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        Replying to @mlrawlings

        If your code ends up being wrapped in a `with`, you probably have bigger problems though. Do you know of a packer/bundler tool that does this?

        1 reply 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. Axel Rauschmayer‏ @rauschma 21 Apr 2019
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        Replying to @mathias

        Clever! And a very useful write-up. But I think I’d prefer something more “traditional”, with eval() as a last resort (I wouldn’t want to rely on Object.prototype being in the chain of globalThis). E.g.:https://gist.github.com/rauschma/bb3e5047a461961cfe19a1335b772d7c …

        1 reply 0 retweets 6 likes
      3. Mathias Bynens‏Verified account @mathias 21 Apr 2019
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        Replying to @rauschma

        Hmm, I’m not a fan of it either, but CSP does seem more common than an environment in which globalThis doesn’t inherit from Object.prototype — I don’t know of any modern ones.

        0 replies 0 retweets 2 likes
      4. End of conversation

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