How to optimize correctly for PWA - vue.js

I made a small project on Vue /Flask, to download videos from VK (the Russian equivalent of Facebook), optimized for PWA, but Google Chrome does not install it as a separate application, which may be an error. The project itself - https://vk-video-loader.herokuapp.com / . For example, the same mobile version of VK(https://m.vk.com /) is also optimized for PWA and chrome offers to install it as a separate application
Lighthouse shows that the project is optimized

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comparison of node and nativescript runtimes

Can I run any node app under nativescript? From my point of view nativescript is a different runtime than node.js. But Node.js incorporates the Google Chrome V8 JavaScript engine as well. The only difference seems that some major functionality of nativescript app depends on core modules and plugins, which provides access to the underlying native mobile platforms.
For example if I run npm install matrix-js-sdk or npm install libp2p, then I can create and run a ns application with functionality of those packages in the same way as I would create a node application?
There is two native bridges that connect the "native" and the "JavaScript" world. One for Android and one for iOS, and these two runtimes are the core of the framework enabling many of the unique features in NativeScript. These two runtimes are using different JavaScript engines - V8 for the Android runtime and JavaScriptCore for the iOS runtime. This means you can use node based library in nativescript apps. But some libraries will not work for example crypto which uses
Secure random number generation that is not supported by v8.
For more info on the issue check this.
For more info on how nativescript works check this.

Nuxt & Capacitor - Unable to add android support

I have a Nuxt 2 app. I'm following the docs to add Capacitor and Android Support.
Everything is fine up to the point of running npx cap add android. The android folder is generated however there are errors in the terminal
√ Adding native android project in android in 342.51ms
√ Syncing Gradle in 944.40μp
√ add in 345.44ms
× copy android - failed!
[error] The web assets directory (.\.nuxt) must contain an index.html file.
It will be the entry point for the web portion of the Capacitor app.
√ Updating Android plugins in 33.68ms
× update android - failed!
[error] Error: ENOENT: no such file or directory, open
'<sourceroot>\android\app\src\main\assets\capacitor.plugins.json'
I’m not running Nuxt in static mode (due to routes and content pulled in dynamically from a CMS). So I run nuxt build which generates the output into a folder named .nuxt by default.
However nuxt build doesn’t create an index.html as an entry point, the nuxt build actually states Entrypoint app = server.js server.js.map. Hence the error above where it can’t find index.html in the .nuxt directory.
Does anyone know a way to resolve this? Or have implemented Capacitor with a Nuxt SPA?
I’ve found resources when using nuxt generate for a static app but not nuxt build for a spa like in my case.
I have a Nuxt2 web app with servers (app server and separate API server), also deployed as an Android app on the Play Store (in alpha testing). Both app flavours look and behave identical and use the same API server, as I desire.
IMHO, in the lifetime of your (universal) app, BOTH build and generate will get leveraged:
build, likely by whatever web app host you use (ie AWS, Heroku, etc), during deployment of the web app.
generate by yourself, when you're ready to submit to the app stores (Apple, Google, etc), making use of Capacitor.
Let's say you have a new feature to add to the app. On that day, you make git commits and increment your version number and when you're ready to deploy the update...
For the web app...
Make commit(s) and version number change
Deploy to your app host, which for most people, will also run the build step for you
The only time I ever run build locally is when I need to make final tests, troubleshoot bugs or make optimizations (e.g. lower final package size).
For the Android or iOS apps...
Make commit(s) and version number change
nuxt generate
Run Capacitor sync (however which way you do it (for me I use: npx cap sync)
Prepare the app store build & submit (however which way you do it)
What nuxt generate does for you, and what Capacitor needs, is a fully rendered snapshot of all your app views together, all at once. It's the equivalent of a web app user opening all your app's views all at once (e.g. 50 browser tabs), pulling all components/styles/etc into their local browser. This fully rendered app state ultimately gets bundled and is what will get submitted to the app store(s).
In Nuxt docs and terminal output, they seem to strongly suggest that if you're using nuxt generate, that you want to be using target: static, however I will say you should completely ignore this advice. Static is what you'd consider if you had a "brochureware" website or some recipe book app that you update once-in-awhile. It goes as far as in the terminal output of nuxt generate, even if I have target: server defined, you'll still see a line saying something along the lines of "Outputting for target static...". Just ignore it.
There is hardly anything static about a typical universal web app.
I personally use target: server with nuxt generate and I haven't seen any problems in the app (web or Android version).

How to fix optimazition error publish in play store

my apk is 1.4MB but error is "This APK results in unused code and resources being sent to users. Your app could be smaller if you used the Android App Bundle. By not optimizing your app for device configurations, your app is larger to download and install on users' devices than it needs to be. Larger apps see lower install success rates and take up storage on users' devices."
how to fix this error
It's only a warning, not an error.
For an app that small I wouldn't worry.
It's not something that's made its way into the Ionic ecosystem yet but I heard that if you open up your project in Android Studio and then do the build through there you can create an app bundle.
I'm not totally sure that its fully tested for Ionic so you might have issues with this, but Android have published a full guide:
https://developer.android.com/guide/app-bundle#get_started
This is what they say:
Download Android Studio 3.2 or higher—it's the easiest way
to add dynamic feature modules and build app bundles.
Add support for Dynamic Delivery
by including a base module, organizing code and resources for configuration
APKs, and, optionally, adding dynamic feature modules.
Build an Android App Bundle using Android Studio.
If you're not using the IDE, you can instead build an app bundle from the
command line.
Test your Android App Bundle by using it to generate APKs that
you deploy to a device.
Enroll into app signing by Google Play.
Otherwise, you can't upload your app bundle to the Play Console.
Publish your app bundle to Google Play.

Android build: Fennec with chromium rendering Engine

I built the chromium for android following these instructions https://code.google.com/p/chromium/wiki/AndroidBuildInstructions .
I got the content shell only not the full browser.
Then, I built the Firefox for Android. I successfully got the Full web browser. But the performance of the chrome content shell was much much better than that of Firefox Android build. Now, I want to try building the Firefox Android using chromium rendering Engine, Blink replacing the Gecko rendering Engine. How much is the difficulty level and how can I start.
Thanks,
Chromium uses Blink (earlier Webkit) as its rendering, and V8 for Javascript interpretation along with various 3rd party dependencies. Even though Content shell is a small browser (sans complex UI of Chromium) it is functional and a wrapper over Blink. Having said that fitting Blink with Firefox (instead of Gecko) will be a new project by itself, probably you can try building Webview, so that you can build a simple browser itself in android. http://developer.android.com/reference/android/webkit/WebView.html
Chromium - Open Source project
Chrome- Google's proprietary software + Chromium
In Android only Google Chrome can be installed as APK, wherease Chromium can be built as content shell or used through WebView
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/zMDKC2x9o5w

How do I speed up load times for Sencha Touch

I am currently developing a Sencha Touch application using Cloud 9 IDE. I created the app on my local machine and later imported the project to Cloud 9. Everything works fine but an annoyance that happens is the load times for my page are greater than a minute. I think it has to do with all the files that are being individually loaded.
What is the best way to speed up the sdk load times? I am unsure how to use the sdk tools and do not know if you can even install them into Cloud 9. Would it be better to abandon the sdk tools and load Sencha manually?
Key is to minify & aggregate all the JS & CSS so that less number of bytes are transferred in less number of http calls. Sencha Cmd has the feature to do all this and create a packaged build to load fast, here is what you have to do from your app directory:
sencha app build package
This will create .>build>package folder with minified version of your app.
For more details read http://docs.sencha.com/touch/2-1/#!/guide/command and look at this http://vimeo.com/55148644 for illustration