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>> I mean Drafts has the ability to download actions (not sure if that is the right term) which are JS that run inside the app. I think this is fine and doesn't

>> I mean Drafts has the ability to download actions (not sure if that is the right term) which are JS that run inside the app. I think this is fine and doesn't skirt any rules, I'm not familiar with that particular app but if that happens it's not fine and it seems to get a pass from Apple. The apps are not allowed to download executable code. You have to bundle it all in the app.

ecedeno 3y ago
That's not exclusive to that app. Being able to update the app without going through the App Store was one of the big selling points of React Native a few years back. Apps are not allowed to download native code, however.
- tl 3y ago
  That's ...not a feature of React Native. It's possible to reload the app's content on code change, but this very clearly intended for development only.
  - williamdclt 3y ago
    You’re describing fast refresh, the parent is talking about codepush. The whole point of CodePush is definitely to update the app without going through the store. It downloads a JS bundle (which is usually most of the app functionalities) and executes it.
- interpol_p 3y ago
  You cannot download and execute native code on iOS, the sandbox prevents it. Memory protection ensures that pages marked as data cannot be executed There is a special entitlement to allow some Apple apps and frameworks to do this — Apple’s JavaScriptCore can do JIT, which requires executing data pages. Similarly, Swift Playgrounds can compile to native code and execute that code So, for example, you could ship a C compiler on iOS and it would compile perfectly valid binaries, but you would never be able to execute those binaries natively without code-signing them and deploying them in an Apple sanctioned way, which you cannot do on-device (except with the above mentioned exceptions)
  - jamil7 3y ago
    > Apple’s JavaScriptCore can do JIT Only for Safari or if you use a WKWebView, otherwise if you use JavascriptCore yourself on iOS, JIT is disabled and quite slow. On macOS it’s enabled.

ecedeno 3y ago

That's not exclusive to that app. Being able to update the app without going through the App Store was one of the big selling points of React Native a few years back. Apps are not allowed to download native code, however.

tl 3y ago
That's ...not a feature of React Native. It's possible to reload the app's content on code change, but this very clearly intended for development only.
- williamdclt 3y ago
  You’re describing fast refresh, the parent is talking about codepush. The whole point of CodePush is definitely to update the app without going through the store. It downloads a JS bundle (which is usually most of the app functionalities) and executes it.
interpol_p 3y ago
You cannot download and execute native code on iOS, the sandbox prevents it. Memory protection ensures that pages marked as data cannot be executed There is a special entitlement to allow some Apple apps and frameworks to do this — Apple’s JavaScriptCore can do JIT, which requires executing data pages. Similarly, Swift Playgrounds can compile to native code and execute that code So, for example, you could ship a C compiler on iOS and it would compile perfectly valid binaries, but you would never be able to execute those binaries natively without code-signing them and deploying them in an Apple sanctioned way, which you cannot do on-device (except with the above mentioned exceptions)
- jamil7 3y ago
  > Apple’s JavaScriptCore can do JIT Only for Safari or if you use a WKWebView, otherwise if you use JavascriptCore yourself on iOS, JIT is disabled and quite slow. On macOS it’s enabled.