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How to do module resolution when an npm package contains multiple namespaces/submodules

A project I am working with is using this package: https://www.npmjs.com/package/#ethersproject/abstract-provider
within an SDK we are building..
After installation, the SDK node_modules folder contains the #ethersproject directory which contains an abstract-provider directory as well as multiple other directories, each their own namespace with separate package.json files.
We use the code in the sdk as follows:
import { Provider } from '#ethersproject/abstract-provider';
and this works fine for webpack based projects which import our SDK (such as a React app using create-react-app).
When I want to use our SDK in a project which DOESN'T use a bundler such as webpack (such as a very simple frontend pulling in our sdk with importmap as here: https://github.com/unegma/rainprotocol__verify-gating), we are getting an error:
Failed to resolve module specifier "#ethersproject/abstract-provider". Relative references must start with either "/", "./", or "../".
I'm assuming this is because our SDK doesn't know how to resolve #ethersproject/abstract-provider because abstract-provider is a submodule of #ethersproject (which isn't even a module itself).
What is the way to solve this issue? Do we need to create a decs.d.ts file in our SDK root which contains something like: declare module "#ethersproject/abstract-provider; or is there a different way to do this?

cannot use import statement outside a module on built exe with electron-forge

I am creating an app with Electron and Vue (using js not ts).
When I run the app using npm run electron:serve the app runs fine.
I now want to build a Windows exe so I can distribute my app. I have tried using electron-builder, electron-packager and electron-forge. Whenever I can get the build to finish, running the exe throws the cannot use import statement outside a module error (referring to the first import statement it finds, i.e. import { app, protocol, BrowserWindow } from 'electron').
I've tried adding "type":"module" to my package.json but (due a bug in Vue, according to this question), that throws Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]
I've also tried changing all my import statements to require but this doesn't work because some of the node modules I'm using use import and the error just throws for those instead.
I'm tearing my hair out over this. Where do I go from here?
UPDATE:
I have found a workaround for the Vue bug and posted my findings on the linked question. I can now add "type":"module" to my package.json.
However, I now get an error thrown when I run npm run electron:serve and from my built exe:
Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: <my_project_root>\dist_electron\index.js
require() of ES modules is not supported.
require() of <my_project_root>\dist_electron\index.js from <my_project_root>\node_modules\electron\dist\resources\default_app.asar\main.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
To be clear, I'm not using require in any of my source code, but the compiled(?) version does?
What's going on here?
UPDATE 2:
As requested, here is a minimal reproducible example that maintains original folder structure, configs and package.json

cordova/exec fails within meteor project

After building a Cordova plugin with plugman, installing it in meteor 2.3.2 and running meteor run android-build, I get the following error from within the plugin:
Unable to resolve some modules:
"cordova/exec" in ~/MeteorApp/MyPlugin/www/MyPlugin.js (web.browser)
The error line is from line 2 in the generate MyPlugin.js
// ~/MeteorApp/MyPlugin/www/MyPlugin.js
// I added this check for cordova myself
if (cordova && cordova.exec ) {
var exec = require('cordova/exec');
exports.coolMethod = function (arg0, success, error) {
exec(success, error, 'MyPlugin', 'coolMethod', [arg0]);
};
}
My meteor structure includes the plugin folder at the route of the app
I installed the package using meteor add cordova:my.plugin.id#file://path/to/plugin/project
Cordova version 10.0.8
I have the following plugin structure:
pluginDir/
src/
android/
MyPlugin.java
www/
MyPlugin.js
package.json
plugin.xml
I have tested the plugin inside a Cordova app and that works just fine.
I bet the issue here is how meteor exposes the internal Cordova object.

Solution
Meteor already wraps the cordova object so really instead of importing cordova/exec in the /www plugin definition I simply had to use cordova.exec('my logic goes here')
The above is scaffolded with plugman and the /www folder and files get generated automatically, as well as the above code.
The code above is valid within Cordova, but this logic fails within Meteor.
Extra comments
Only Android support was required for this plugin and the cordova.exec() logic was moved into a Meteor api method.
Because of this Android-only requirement the /www folder and references was removed.
The /www folder may be reintroduced in the future in order to define a nice fallback for web usage scenarios, but it's unlikely for our internal plugin.

Power BI custom D3 chart Could not find plugin "proposal-numeric-separator"

I have tried for custom D3 Power BI ,but showing me below error .I also reinstall pbiviz and node but showing same error .Need little help.
I tried adding different version older but not got success.
my node version is v12.16.1. and pbiviz 3.1.10 Now
PS C:\Users\mahendra\Downloads\PowerBI-visuals-sampleBarChart-master\PowerBI-visuals-sampleBarChart-master\CircleCard> pbiviz package
info Building visual...
info Start preparing plugin template
info Finish preparing plugin template
Error parsing bundle asset "C:\Users\mahendra\Downloads\PowerBI-visuals-sampleBarChart-master\PowerBI-visuals-sampleBarChart-master\CircleCard\.tmp\drop\visual.js": no such file
No bundles were parsed. Analyzer will show only original module sizes from stats file.
Webpack Bundle Analyzer saved report to C:\Users\mahendra\Downloads\PowerBI-visuals-sampleBarChart-master\PowerBI-visuals-sampleBarChart-master\CircleCard\webpack.statistics.prod.html
ERROR Failed to compile with 1 errors 10:43:12 PM
error in ./.tmp/precompile/visualPlugin.ts
Module build failed (from C:/Users/mahendra/AppData/Roaming/npm/node_modules/powerbi-visuals-tools/node_modules/babel-loader/lib/index.js):
Error: [BABEL] C:\Users\mahendra\Downloads\PowerBI-visuals-sampleBarChart-master\PowerBI-visuals-sampleBarChart-master\CircleCard\.tmp\precompile\visualPlugin.ts: Could not find plugin "proposal-numeric-separator". Ensure there is an entry in ./available-plugins.js for it. (While processing: "C:\\Users\\mahendra\\AppData\\Roaming\\npm\\node_modules\\powerbi-visuals-tools\\node_modules\\#babel\\preset-env\\lib\\index.js")
at getPlugin (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\preset-env\lib\index.js:67:11)
at C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\preset-env\lib\index.js:258:62
at Array.map (<anonymous>)
at C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\preset-env\lib\index.js:258:43
at C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\helper-plugin-utils\lib\index.js:19:12
at C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\core\lib\config\full.js:199:14
at Generator.next (<anonymous>)
at Function.<anonymous> (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\core\lib\gensync-utils\async.js:26:3)
at Generator.next (<anonymous>)
at step (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\gensync\index.js:254:32)
at evaluateAsync (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\gensync\index.js:284:5)
at Function.errback (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\gensync\index.js:108:7)
at errback (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\#babel\core\lib\gensync-utils\async.js:70:18)
at async (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\gensync\index.js:183:31)
at onFirstPause (C:\Users\mahendra\AppData\Roaming\npm\node_modules\powerbi-visuals-tools\node_modules\gensync\index.js:209:13)
at Generator.next (<anonymous>)
# multi ./.tmp/precompile/visualPlugin.ts
error Package wasn't created. 1 errors found
warn Please, make sure that the visual source code matches to requirements of certification:
info Visual must use API v2.5 and above
info The project repository must:
info Include package.json and package-lock.json;
info Not include node_modules folder
info Run npm install expect no errors
info Run pbiviz package expect no errors
info The compiled package of the Custom Visual should match submitted package.
info npm audit command must not return any alerts with high or moderate level.
info The project must include Tslint from Microsoft with no overridden configuration, and this command shouldn’t return any tslint errors.
info https://www.npmjs.com/package/tslint-microsoft-contrib
info Ensure no arbitrary/dynamic code is run (bad: eval(), unsafe use of settimeout(), requestAnimationFrame(), setinterval(some function with user input).. running user input/data etc.)
info Ensure DOM is manipulated safely (bad: innerHTML, D3.html(<some user/data input>), unsanitized user input/data directly added to DOM, etc.)
info Ensure no js errors/exceptions in browser console for any input data. As test dataset please use this sample report
info Full description of certification requirements you can find in documentation:
info https://learn.microsoft.com/en-us/power-bi/power-bi-custom-visuals-certified#certification-requirements

I sorted out after long trial and error.
Here are the steps. First, manually install the problematic dependencies:
npm install --save-dev #babel/core
npm install --save-dev #babel/preset-env
npm i #babel/plugin-proposal-numeric-separator
Second, go to file path in which the error is occurring (not in your code dir). In my case:
C:/Users/mahendra/AppData/Roaming/npm/node_modules/powerbi-visuals-tools/node_modules/#babel/preset-env/lib/available-plugins.js
Note that this was found by examining the error message and noticing this line:
Ensure there is an entry in ./available-plugins.js for it. (While processing: "C:/Users/mahendra/AppData/Roaming/npm/node_modules/powerbi-visuals-tools/node_modules/#babel/preset-env/lib/index.js")
Finally, add the following lines to the file:
var _pluginTransformNumericSeperator = _interopRequireDefault(require("#babel/plugin-proposal-numeric-separator")); (Import dependency; anywhere above the definition of the export object _default)
"proposal-numeric-separator": _pluginTransformNumericSeperator (Add the dependency as a new export in the export object _default by adding a new key value pair)
Note that you may have to replace the path argument to require() with an absolute path to the location of #babel/plugin-proposal-numeric-separator in step 1 above if you are unable to resolve this during your next build.
Enjoy!

The root issue seems to be a problematic version of #babel/plugin-proposal-numeric-separator that powerbi-visuals-tools is depending on.
An alternative to the accepted solution is to install a working version of #babel/plugin-proposal-numeric-separator as a global dependency and then modify the powerbi-visuals-tools to use this instead of its packaged version. See steps below:
npm i -g #babel/plugin-proposal-numeric-separator
Locate the file that lists dependencies for the failing module. See the accepted answer for instructions, but it seems to be this path for Windows: <userDir>/AppData/Roaming/npm/node_modules/powerbi-visuals-tools/node_modules/#babel/preset-env/lib/available-plugins.js
Add the following lines to this file:
var _pluginTransformNumericSeperator = _interopRequireDefault(require("#babel/plugin-proposal-numeric-separator"));
This imports our globally installed dependency: place anywhere above the definition of the export object _default
"proposal-numeric-separator": _pluginTransformNumericSeperator
Add the dependency as a new export in the export object _default by adding a new key value pair
You should now see the build succeed.
As a note, I'd generally avoid installing global dependencies like this. However, this may be the easiest workaround until the powerbi-visuals-tools package is updated to fix this issue. When this is done, I would recommend uninstalling the global dependency and reinstalling the powerbi-visuals-tools from scratch to undo our changes to the dependency file.

Getting npm packages to work with babel (babel-loader)

I'm really new to webpack, babel, React and all this stuff. So I'm probably missing something really obvious. To get a jumpstart on my React project I'm using react-redux-bootstrap-webpack-starter. It all works well, but now my lack of understanding really shows with my latest problem.
The problem:
I'm trying to import jwtDecode from 'jwt-decode' and it throws the following error:
./src/app/redux/modules/login.js
Module not found: Error: Can't resolve 'jwt-decode/build/jwt-decode' in
'/usr/src/app/src/app/redux/modules'
# ./src/app/redux/modules/login.js 12:17-55
# ./src/app/redux/modules/reducers.js
# ./src/app/redux/store/configureStore.dev.js
# ./src/app/redux/store/configureStore.js
# ./src/app/Root.js
# ./src/app/index.js
# multi react-hot-loader/patch webpack-hot-middleware/client
./src/app/index.js
What have I done:
I've Docker-ized the frontend app, so I just added the jwt-decode package to package.json and rebuilt the image. The Docker build executes npm install.
I've tried to import jwtDecode from 'jwt-decode' then I tried import jwtDecode from 'jwt-decode/build/jwt-decode
I made sure I can reference other npm packages similarly installed. On a new docker instance I installed lodash, imported it in the same file and there was no problem.
My hypotheses:
There's something about the particular jwt-decode package that makes it not work well with babel.
To make it work I need either to modify the jwt-decode package or to configure webpack and the babel-loader differently. How?

Babel doesnt transpile anything for JWT-decode and I dont think webpack has any extra configuration for it either.
It looks like the places that you are trying to use jwt-decode, like: './src/app/redux/modules/login.js ', in your app cannot find the directory and so are failing. Make sure that whatever module loader you're using is referencing the correct path to the jwt-decode directory.
Try loading it like this ( if you are using ES2015 via Babel transpilation):
import jwt_decode from "jwt_decode";