Can't read from a file using JSPromise about javascriptkit HOT 4 CLOSED

The problem is here:

let promise = file.text.function!.callAsFunction().object!

The use of callAsFunction is unnecessary and causes the text method to not get the proper this value internally. Here’s the standard way to do this in JSKit:

let promise = file.text().object!

from javascriptkit.

I think that’s the best we can do for now. There isn’t currently a cross-browser supported way for us to keep an object alive on the Swift side as long as its corresponding JS object remains alive. So you have to keep a strong reference to the JSObjectRef inside Swift if you want JS to be able to call into it. Once Safari gains support for FinalizationRegistry, it should be possible for us to automatically hold onto Swift objects until they’re no longer reachable from either Swift or JS.

from javascriptkit.

Indeed, though I actually had to change it to:

let promise = file.text!().object!

But now I'm getting:

[Error] Fatal error: The function was already released: file JavaScriptKit/JSFunction.swift, line 292
[Error] Unhandled Promise Rejection: RuntimeError: Unreachable code should not be executed (evaluating 'exports.swjs_call_host_function(host_func_id, argv, argc, callback_func_ref)')

from javascriptkit.

I fixed it by changing it to:

let jsPromise = JSPromise<JSValue, Error>(promise)!

jsPromise.then { value in
    let console = JSObject.global.console.object!
    let log = console.log.function!

    log(value)

    // Without this, `jsPromise` gets released before this
    // closure gets called.
    print(jsPromise)
}

but I feel like it's not the best solution.

from javascriptkit.