getTypeOf() Can't infer datatype in Firefox Addon context #759
Comments
|
The addon works as expected on chrome though. Which is ironic, since I'm developing primarily with firefox in mind |
|
This issue is easy to reproduce with a UserScript. Install Greasemonkey or Violentmonkey in Firefox. Then install this script: // ==UserScript==
// @name test
// @version 1
// @include https://github.com/*
// @grant none
// @require https://cdn.jsdelivr.net/npm/[email protected]/dist/jszip.js
// ==/UserScript==
(async () => {
const zip = new JSZip();
const blob = await zip.generateAsync({type:'blob'});
try {
zip.file('test.txt', new Blob(['']));
}
catch(error) {
console.error(error);
}
try {
await JSZip.loadAsync(blob);
}
catch(error) {
console.error(error);
}
})();Adding blob to a zip throws Both can be fixed with either #578 or #598. But then loading zip from blob throws jszip/lib/reader/Uint8ArrayReader.js Line 18 in 053d8d5 And I'm not sure how to fix that. WORKAROUNDSince I don't know when it's going to be fixed and in my case those PRs don't solve my problem I'm using this workaround: const readAsBinaryString = blob => new Promise(resolve => {
const reader = new FileReader();
reader.onload = function(event) {
resolve(event.target.result);
};
reader.readAsBinaryString(blob);
});
(async () => {
const zip = new JSZip();
const blob = await zip.generateAsync({type:'blob'});
zip.file('test.txt', await readAsBinaryString(new Blob([''])), {binary: true});
await JSZip.loadAsync(await readAsBinaryString(blob));
})();And now it works. Related issue greasemonkey/greasemonkey#3120 |
|
Faced the same problem in Firefox web extension content script. const encodedText = new TextEncoder().encode('some text'); // ok
const buffer = new Uint8Array(encodedText.buffer); // ok, but seems like some security flags for new object are missing
buffer.slice(); // Error: Permission denied to access property "constructor"
buffer.subarray(0, 2); // Error: Permission denied to access property "constructor"Creating new ArrayBufferView from existing ArrayBuffer in web extension content script leads to Error: Permission denied to access property "constructor" on any method call for new object. Created a bug report here: https://bugzilla.mozilla.org/show_bug.cgi?id=1868675 |
I'm trying to save a bunch of image blob (from canvas.toBlob) into a zip for an addon I'm working on.
But I keep getting the
Can’t read the data of […]. Is it in a supported JavaScript typeerror.Here's the code block I'm using
In what seems like a repetition of #151 this is the error I get
Which leads me to exports.getTypeOf. I added some console logs to it, and this is the result
2 calls, seems legit, there are 2 images being zipped. (in all trials)
According to this stackoverflow comment it might be better to use
input.constructor.nameinstead ofinstanceof. I using that in the function blocks, but while that doesn't throw an error, I don't get the download prompt either (not the console.logs in the callback function)Multiple calls, each with a different type!?
I also tried some
console.logs to checkout the return value, and the output is even more confusionOnly 1 call to the function (a Blob?)
The text was updated successfully, but these errors were encountered: