Use npm packages for flutter web when pub.dev plugins don't have web support

Question

I'm trying to make an app in flutter, iOS+Android+Web but a few. plugins don't offer web support.

I found npm packages of the same sdk and want to use

flutter iOS+Android with iOS+android plugin sdk. flutter web + npm package sdk.

Is there a way to use npm/node packages in a flutter web app if the plugins don't have web support?

Solution

Try using webpack.

In one of my projects I had to call Javascript (since isolates on web don't work as expected). I created a separate project with javascript, and had webpack script compile directly into flutter web folder. Granted, I didn't use any npm packages, but I don't see why it should not work.

This is my webpack.config.js (/src/worker.js is the entry javascript file):

const CopyWebpackPlugin = require('copy-webpack-plugin');
const webpack = require('webpack');
const path = require('path');

module.exports = {
    mode: 'production',
    entry: './src/worker.js',
    output: {
        filename: '[name].bundle.js',
        path: path.resolve(__dirname, '../flutter_app/web/', 'my_js')
    }
}

In your Dart code you can use Worker class to call the script, something like:

var myWorker = Worker('../my_js/main.bundle.js');
    myWorker.onMessage.listen((returnValue) {
//Some processing here...
});
var event = {"arg1": "value1", "arg2": "value2"};
myWorker.postMessage(json.encode(event));

** Update: this is what the worker ('./src/worker.js') receiving the call looked like:

import algorithm from './index'; 

onmessage = async function(messageEvent) {

  let event=JSON.parse(messageEvent.data);
  let message=await algorithm (event);
  postMessage(message);

}