a pleasant descent into madness

Category: WEB

host angular web-app in wsl2, access from windows host, develop in vs-code

Or: How do i work in a modern, efficient and really really nice way?

The goal of this article is to set up a system where you will be running an angular web application in WSL2 and access it via a Browser on the Windows Host.
It’s pretty straightforward, because i prepared a little something.

Prepare following docker-compose.yml file (which you want to place somewhere on the same file-system level as your application, or above it, not below!)

image: cryptng/angular:node14ng13
– ./my-angular-app:/app
– “4200:4200”
command: bash -c “npm install -f –loglevel verbose && ng serve –verbose — watch=true –host= –proxy-config proxy.config.json –disable-host-check”
version: ‘3.5’

You WILL have to fix the indentation to match yml standards.

You might notice that we are using an existing image from the docker hub.
It’s actually a repository that i manage and maintain with a friend.
If you check it out in detail, you will notice that this images matches the latest
angular-web-development standards as per november of 2021 (nearing the end of the corona crisis, probably, maybe).

The image basically uses Node:14 as a base image, containing NPM and YARN, and installs Angular-CLI 13 and Angular-Core 13 on a local and global level, then exposes port 4200.


Of course, you can easily modify the “ports” section of the compose file to change the port you want to serve to, the LEFT side is the host side.

That means that if you run this compose file with a valid application, you will be able to reach your application from a browser on the windows host via “http://localhost:4200”.
If you change the LEFT element from 4200 to 4201, the address will be “http://localhost:4201” independently from the actual EXPOSE command in the dockerfile providing the container.

bash -c “npm install -f –loglevel verbose && ng serve –verbose — watch=true –host= –proxy-config proxy.config.json –disable-host-check”

This command assumes you have a proxy.config.json in the application directory, remove the –proxy-config proxy.config.json part if you do not have a backend running on the windows host, else, create a proxy.config.json and configure it to lead to the windows host.

The npm command will install all dependencies whenever the docker-compose has been run.

Now, if you also want to be developing in visual studio code, install it in your WSL and run
“code path-to-your-app-directory/. “
it will open VS code in this directory, vs code will automagically understand that this is an angular application and will give you some prompts depending on its complexity and components.

If you now have a valid application in the “my-angular-app” directory, you can have fun and start developing.


materialize.css & parallax

I’m explaining this problem from an “ember” point of view, still, this solution fits multiple frameworks and is a general fix to get materialize parallax working – stay tuned!

If you know web frameworks, you know the dreaded word


from any log at any time, everywhere!

Some time ago i encountered a familiar error message while updating an ember project:

using this.$() in a component has been deprecated, consider using this.element
[deprecation id: ember-views.curly-components.jquery-element] 

Ember 3.9 deprecation (2019)

To read a detailed description on the reason this deprecation was introduced and the details on upgrading on it, please click the link in the quotation, it’ll lead you to deprecations.emberjs.com

The actual reasoning behind this change is not relevant for the fix that i’m going to introduce.

Anyhow, this change affected the parallax background(s) on my webpage, it didn’t break anything, but it would surely introduce a problem on the long run, so i was going to update the deprecated line.

The line looked like this:


The full deprecation warning looked like this:

Using this.$() in a component has been deprecated, consider using this.element [deprecation id: ember-views.curly-components.jquery-element]
See https://deprecations.emberjs.com/v3.x#toc_jquery-apis for more details.

I looked all around and found a solution on the original materialize documentation (and copies of this solution on the StackOverflow)

So i applied the “fix” and replaced my line with this:

 document.addEventListener('DOMContentLoaded', function() {
    var elems = document.querySelectorAll('.parallax');
    var instances = M.Parallax.init(elems, options);

The above code implies that you somehow import “M” from materialize css, which would add this entry to the top of the page:

import M from ‘materialize.css’;

And you know what?

It didn’t work.
I didn’t get an error, and i didn’t get a parallax.
The page was just showing no background…

Next thing i did was contacting a good friend to ask him about his opinion.
He told me, first of all, that materialize.css does not have to be imported anymore on the latest versions of ember, it’s globally injected, automagically.

So ok, we throw out the import.
The code still doesn’t work.

He tells me that it’s not a good idea to add an eventListener like this in ember, unsure if this listener like this would actually be triggered , prefering that we use the ember native method “later” to execute the code at the end of the runloop, when the dom has been build.

So we import “later” and change the code, like following:

import { later } from ‘@ember/runloop’;

var elems = document.querySelectorAll(‘.parallax’);         
window.M.Parallax.init(elems, options);});

nope, still a white background, nothing parallaxy going on here.

So then, something caught our eyes..
what’s that “options” variable doing there?
Where does it come from?
It’s never been introduced, it’s undefined, and i assumed it would be passed on as undefined, not having an effect on further execution.

Some “stepping into” later, we notice that, since the options variable is undefined, the initialization code is never executed by materialize.

We change the code like following:

import { later } from ‘@ember/runloop’;

var elems = document.querySelectorAll(‘.parallax’);         

Passing no options, alternatively, you may pass an empty hash like so “{}” as second parameter.

Bam, fixed. Parallax’es going for you.


Fix “Unsupported platform for fsevents” in npm

When trying to install npm packages via “npm install”, you might encounter an error “EBADPLATFORM”

npm ERR! notsup Unsupported platform for fsevents@1.1.3: wanted 

This Error is indicating that you are installing the fsevents module in another OS rather than Mac, but the fsevents module only works for Mac OS.
If you did not purposefully include fsevents in your package.json, this hints at a sub-dependency.

To fix this error, you can use following parameters in the npm install command:

npm install -f --loglevel verbose 

The loglevel will help you debug any further problems. “-f” will force npm to fetch remote resources even if a local copy exists on disk.

I was unable to obtain information on how this fix actually corrects the sub-dependency issue, i could guess, but that doesn’t really help anyone.

If anyone has an explanation that’s more than just guessing, please feel free to leave a comment!

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