Nativescript Class constructor Observable cannot be invoked without 'new' - angularjs

Question

I'm trying to upload a multipart form in nativescript and I'm using http-background. I keep getting the error Class constructor Observable cannot be invoked without 'new'. I've tried changing the compilerOptions target to es5 and es2017, but nothing changed.
Here's all my code from the component.
onSave(){
console.log("clicked")
this.proccessImageUpload(this.file);
}
public onSelectSingleTap() {
this.isSingleMode = true;
let context = imagepicker.create({
mode: "single"
});
this.startSelection(context);
}
private startSelection(context) {
let that = this;
context
.authorize()
.then(() => {
that.imageAssets = [];
that.imageSrc = null;
return context.present();
})
.then((selection) => {
console.log("Selection done: " + JSON.stringify(selection));
this.file = selection[0]._android;
that.imageSrc = that.isSingleMode && selection.length > 0 ? selection[0] : null;
// set the images to be loaded from the assets with optimal sizes (optimize memory usage)
selection.forEach(function (element) {
element.options.width = that.isSingleMode ? that.previewSize : that.thumbSize;
element.options.height = that.isSingleMode ? that.previewSize : that.thumbSize;
});
that.imageAssets = selection;
}).catch(function (e) {
console.log(e);
});
}
// proccess image function
proccessImageUpload(fileUri) {
var backgroundHttp = require("nativescript-background-http");
return new Promise((resolve, reject) => {
// body...
var request = {
url: 'http://192.168.0.2:4000/api/posts',
method: "POST",
headers: {
"Content-Type": "application/octet-stream",
"user_id": "<user_id>"
},
description: 'Uploading profile image..',
androidAutoDeleteAfterUpload: false,
androidNotificationTitle: 'Profile image'
}
var params = [
{ name: "title", value: "test" },
{ name: "content", value: "test" },
{ name: "fileToUpload", filename: fileUri, mimeType: "image/jpeg" }
];
var backgroundSession = backgroundHttp.session('image-upload');
var task = backgroundSession.uploadFile(fileUri, request);
task.on("progress", (e) => {
// console log data
console.log(`uploading... ${e.currentBytes} / ${e.totalBytes}`);
});
task.on("error", (e) => {
// console log data
console.log(`Error processing upload ${e.responseCode} code.`);
reject(`Error uploading image!`);
});
task.on("responded", (e) => {
// console log data
console.log(`received ${e.responseCode} code. Server sent: ${e.data}`);
// var uploaded_response = JSON.parse(e.data);
});
task.on("complete", (e) => {
// console log data
console.log(`upload complete!`);
console.log(`received ${e.responseCode} code`);
// console.log(e.data);
})
resolve(task);
});
}
I know the issue is coming from this line.
var task = backgroundSession.uploadFile(fileUri, request);
Any help would be greatly appreciated!

Answer 1

You use old version if nativescript-background-http plugin
You have to install latest version
tns plugin add #nativescript/background-http

Answer 2

I was able to get this working by installing tns version 6.

Answer 3

I had exactly the same problem. I got this from slack.com, compliments Chris Vietor
"tns plugin add nativescript-background-http" works with nativescript 6.
"tns plugin add #nativescript/background-http" works with nativescript 7.