Develop Reference

ServiceWorker in React and Typescript

When creating javascript-based React projects, installing a Service Worker is just a matter of changing serviceWorker.unregister() to serviceWorker.register() on index.jsx.
With such project structure:
- src
|- index.jsx
|- serviceWorker.js
When this code gets built, the /build folder will look as followed:
- build
|- static
| |- css
| |- js
| |- media
|
|- index.html
|- service-worker.js
This will work fine and will result in the Service Worker being registered properly.
On the other hand, when setting up a project in Typescript, given the same project structure (where the js / jsx files are ts / tsx instead), the /build will look something similar:
- build
|- static
| |- js
| |- bundled-js.chunk.js
| |- bundled-js2.chunk.js
| |- ..
|
|- index.html
So it seems Typescript builds the serviceWorker bundling it with all the other js files.
This will then result in the Service Worker not being registered, with the following error in console:
Error during service worker registration: DOMException: Failed to register a ServiceWorker for scope ('https://example.com/') with script ('https://example.com/service-worker.js'): The script has an unsupported MIME type ('text/html').
The live site with the error can be seen here; The open source code can be found here.
Any idea of what I may be doing wrong?
Any tip is greatly appreciated, thank you in advance!

Ok, looking at your code your using Create React App,. This uses webpack, and it's that what is bundling, it's nothing to do with Typescript, the same would happen for Javascript when it gets bundled.
The problem is overriding the webpack config's is not easy, there is CRACO -> https://github.com/gsoft-inc/craco/blob/master/packages/craco/README.md#webpack-api
But even then it's a little tricky!! You need to tell webpack not to bundle service-worker.js, Also I would take the register bit out of the server-worker, as that can be bundled and wants to be included in your bundle.
The simplest option might be just to compile the webworker separately with Typescript directly. And again, keep the register bit separate inside your normal build.

Testing angular components outside of main project folder: module not found raw-loader

So I want to run ng test and include tests in a folder next to the projectfolder.
mainproject/
|-- src/
| |-- app/
| | |-- home/
| | | |-- home.component.spec.ts
| | |-- app-main.component.spec.ts
| |-- test.ts
| |-- tsconfig.spec.json
|-- node_modules/
|-- angular.json
|-- package.json
|-- tsconfig.json
components/
|-- common/
|-- control-bar/
|-- control-bar.component.ts
|-- control-bar.component.spec.ts
When I run ng test without including the other tests in the components folder it works as intended, but when I try to include the other components ng test fails with the following error.
ERROR in ../components/common/control-bar/control-bar.component.ts
Module not found: Error: Can't resolve 'raw-loader' in 'absolutepath\repos\components\common\control-bar'
resolve 'raw-loader' in 'absolutepath\repos\components\common\control-bar'
Parsed request is a module
No description file found
resolve as module
absolutepath\repos\components\common\control-bar\node_modules doesn't exist or is not a directory
absolutepath\repos\components\common\node_modules doesn't exist or is not a directory
absolutepath\repos\components\node_modules doesn't exist or is not a directory
absolutepath\repos\node_modules doesn't exist or is not a directory
absolutepath\node_modules doesn't exist or is not a directory
C:\Users\user\Desktop\node_modules doesn't exist or is not a directory
C:\Users\user\node_modules doesn't exist or is not a directory
C:\Users\node_modules doesn't exist or is not a directory
C:\node_modules doesn't exist or is not a directory
looking for modules in absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules
using description file: absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\package.json (relative path: ./node_modules)
using description file: C:\Users\user\Desktop\folder absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\package.json (relative path: ./node_modules/raw-loader)
no extension
absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader doesn't exist
.js
absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader.js doesn't exist
.json
absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader.json doesn't exist
as directory
absolutepath\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader doesn't exist
[C:\Users\user\Desktop\folder\repos\components\common\control-bar\package.json]
[C:\Users\user\Desktop\folder\repos\components\common\control-bar\node_modules]
[C:\Users\user\Desktop\folder\repos\components\common\node_modules]
[C:\Users\user\Desktop\folder\repos\components\node_modules]
[C:\Users\user\Desktop\folder\repos\node_modules]
[C:\Users\user\Desktop\folder\node_modules]
[C:\Users\user\Desktop\node_modules]
[C:\Users\user\node_modules]
[C:\Users\node_modules]
[C:\node_modules]
[C:\Users\user\Desktop\folder\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader]
[C:\Users\user\Desktop\folder\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader.js]
[C:\Users\user\Desktop\folder\repos\mainproject\node_modules\#angular-devkit\build-angular\node_modules\raw-loader.json]
# ../components/common/control-bar/control-bar.component.ts 13:34-85
# ../components/common/control-bar/control-bar.component.spec.ts
# ./src/test.ts
So raw-loader seems to be missing or it can't find it. To be clear there is only 1 node_modules in this setup and it's inside the mainproject folder.

I'm having the exact same issue and I've abandoned the search for a proper solution. For now I'm making it work by making sure the dependencies of the library are installed separately (so having a second node_modules folder in the library).
Since there is nothing to be found on the subject and the official angular documentation for creating libraries mentions that it is required for libraries to be built:
Build the library. You cannot use a library before it is built.
I'm assuming dynamically linking to unbuilt libraries without its own node_modules is simply unsupported (even though it works fine as long as there are no component classes imported in the library).

Unable to load javascript files on apache

I have the following file structure for a php application running with apache server in a debian computer.
/var/www/project/
|-- index/index.php
|-- local
|-- view
| `-- *.php
|-- model
| `-- *.php
|-- controller
| `-- *.php
|-- supportfiles
|-- css
| `-- *.css
|-- javascript
`-- *.js
. . .
I've configured apache so that when I type in my browser http://localhost, apache loads /var/www/project/index/index.php.
To do this, I've changed two files
/etc/apache2/sites-available/000-default.conf
where I set
DocumentRoot /var/www/project/index/
and the file
/etc/apache2/apache2.conf
where I also set
<Directory /var/www/project/index/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
This changes seem to work ok since http://localhost loads the intended index.php file located in the /var/www/project/index directory; however, I'm unable to load java script files such as the following
<!-- <script language="JavaScript" src="../local/supportfiles/javascript/validation.js"></script> -->
What is the problem here? I'm guessing the problem is that apache does not have access to /var/www/project/supportfiles/javasecript/*.js. The original apache configuration (where the apache root directory was /var/www/ and had to load the index.php file by typing http://localhost/project/index) loaded the java script files normally.

Apache cannot serve files that are outside of the document root. In this case, your document root should probably be set to
/var/www/project/.
If you would like to be able to still access your site with
http://localhost/
then you should move "index.html" to the root of the project folder.
/var/www/project/
- index.php
- local/
- view/
- model/
- controller/
- supportfiles/
- css/
- javascript/

I Install phpmyadmin and after this javascript don´t load.
I found on /etc/apache/conf.enabled the file javascript-common.conf
inside this file has a line
Alias /javascript /usr/share/javascript
This line make apache follow to /usr/share/javascript all content of pages.
You need change on your pages of javascript to scripts or other name

How to require deep nested NodeJS modules?

I have the following application structure:
application
|- config
|----- config.js
|- routes
|------ api
|-----------router.js
|- Application.js
|- package.json
In /routes/api/router.js module I need to require /config/config.js file and do the following:
require('../../config/config.js');
I found the code above ugly and want to make it more pretty. Also if I move /routes/api/router.js to another folder I have to refactor all requires. What is the best practices to require that modules and is it possible to require config.js from application folder root, something like the following:
require('/config/config.js');
Thanks.

There are a few ways to get around this problem. One is to put all your shared code (like config.js) in a directory under node_modules (using lib here in case you want to have directories other than config in there):
application
|- node_modules
|----- lib
|---------- config
|-------------- config.js
|- routes
|------ api
|-----------router.js
|- Application.js
|- package.json
So then you could require config.js using require( 'lib/config/config.js' ).
Alternatively, you could create a lib symlink in node_modules and link it to lib in your application directory structure:
application
|- node_modules
|----- lib -> ../../lib
|- lib
|------ config
|---------- config.js
|- routes
|------ api
|-----------router.js
|- Application.js
|- package.json
One other alternative, which unfortunately is discouraged by the node docs, is to use NODE_PATH which lets you specify directories that node's require() algorithm should look into. Following the same pattern as above with lib, you would do:
application
|- lib
|------ config
|---------- config.js
|- routes
|------ api
|-----------router.js
|- Application.js
|- package.json
and set NODE_PATH equal to $path_to_application/lib.
UPDATE
Found this great discussion on the topic which includes the options above as well as a few other ones.

The easiest solution is to use path.resolve. If you only give relative paths to path.resolve then it assumes they are relative to the current working directory, i.e. the project root. So all you need is:
const path = require('path');
path.resolve('config/config.js');

require('/config/config.js');
will not work as you are using the root of the system(os) not the root of the application.
var path=require('path');
var root=path.dirname(process.mainModule.filename);
or
var root=process.cwd();
will give you the root of the application. To navigate to config.js
path.resolve(root,'config/config.js)

jsTestDriver + Nant = test directory issue

I am working on a project where the Javascript is becoming more complex, and needs to be tested as part of our automated build.
Now I have got a project structure like shown below:
- root
|- build.xml
|- tools
|- js-test-driver
|- js-test-driver.js
|- js-test-driver.conf
|- src
|- code
|- projectname.web
|- assets
|- javascript
|- my-javascript-files.js
|- tests
|- projectname.javascript
|- my-javascript-tests.js
In my Nant build I kick off Java using then pass it the js-test-driver.js file, with the arguments to use the config file provided. Now I noticed that when I was running it that its config file paths seem to be relative to the js-test-driver directory, not the project root directory.
I didnt think this was an issue, and just put the following in my config file:
server: http://localhost:9876
load:
- ../../src/code/projectname.web/assets/javascript/*.js
- ../../src/tests/projectname.javascript/*.js
Now if I run my task in Nant, it starts up the test driver (in Firefox currently) fine but just fails, saying that it cannot find any tests to run, but the thing which I find confusing is that it lists the test directory as:
tests/../../src/tests/projectname.javascript/*.js
And I cannot for the life of me figure out why it is putting this "tests/" before everything... If i put ../../../ in to negate this seemingly hardcoded tests dir, it tells me that the path is not in a valid pattern.
Anyone else had anything similar or know where I am going wrong?

The "tests" folder is always prepended, it's just where jsTestDriver serves its files from. To quote Cory Smith from the jsTestDriver team:
All resources associated with the test
run are served off /test. All static
runner resources are served off
/static
JsTestDriver-1.3.2 has problems with relative paths. The issue has already been discussed and filed as an issue.
Did you try setting the basepath in js-test-driver.conf. It's fairly new and not yet documented, not sure how it's affected by the relative path problems.
basepath: /root/src