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index.css:undefined:undefined: plugin is not a function

I am attempting the Introducing a complete toolchain chapter of the Understanding client-side web development tools module of the MDN Front End Developer course. I have reached the final Running the transformation section where the instructions advise to run npx parcel src/index.html. At this stage I encounter two issues.
The build process gets stuck on Building scheduler-tracing.development.js. After several aborted attempts I let this run for 6 hours before aborting.
After aborting the process and re-running, I receive the following error:
/home/username/dev/will-it-miss/src/index.css:undefined:undefined: plugin is not a function
at LazyResult.run (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:288:14)
at LazyResult.asyncTick (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:212:26)
at /home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:254:14
at new Promise (<anonymous>)
at LazyResult.async (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:250:23)
at LazyResult.then (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:131:17)
Being new to development I haven't had much luck in troubleshooting this error but these are the actions taken so far:
Set index.js script type to module and updated SVG paths as suggested in this thread on the MDN Discourse forum.
Replaced the postcss specific nested selectors from index.css with regular selectors
Reverted the project version of postcss to a previous build
Deleted and rebuilt the project from scratch 5~ times and get the same results (Stuck building scheduler-tracing.development.js, abort process, re-run and error relating to index.css outlined above.
Another user reported the same error I have as shown in the linked forum thread. if there is any other info that could be useful in troubleshooting this error, please let me know.

Try the following:
Run the following command to install a compatible version of
postcss-preset-env: npm install --save-dev postcss-preset-env#6.7.0
Add a single file called .postcssrc.json (if it is not already there; this replaces the .postcssrc file) to the root of your project
directory.
Add the following contents to the new file, which will automagically
give us full access to the latest CSS features:
{ "plugins": { "postcss-preset-env": { "stage": 0 } } }
Run the npx parcel index.html command again.
References:
Github, Inc. Issue with "Introducing a complete toolchain": fails to build; problem with postcss-preset-env versions #12495. https://github.com/mdn/content/issues/12495#issuecomment-1025004164. (Accessed 20 July, 2022).

how to resolve c++ v8pp unresolved external symbol

I try to execute v8 runtime environment from within c++ application to achive js support for my application. I successfully compile v8pp and now try to use the lib in my own console application. Currently I get a lot of unresolved symbol messages and do not get it what is the difference from working unit tests project within v8pp solution. Can someone point me to the right direction of what I am doing wrong here?
Build started...
1>------ Build started: Project: v8pp, Configuration: Debug Win32 ------
1>class.cpp
1>context.cpp
1>convert.cpp
1>json.cpp
1>throw_ex.cpp
1>version.cpp
1>Generating Code...
1>v8pp.vcxproj -> C:\git\v\v8pp\bin\Debug\v8pp.lib
2>------ Build started: Project: ConsoleApplication1, Configuration: Debug Win32 ------
2>ConsoleApplication1.obj : error LNK2019: unresolved external symbol "void __cdecl v8::api_internal::ToLocalEmpty(void)" (?ToLocalEmpty#api_internal#v8##YAXXZ) referenced in function "public: class v8::Local<class v8::Function> __thiscall v8::MaybeLocal<class v8::Function>::ToLocalChecked(void)" (?ToLocalChecked#?$MaybeLocal#VFunction#v8###v8##QAE?AV?$Local#VFunction#v8###2#XZ)
...
From what I can see I use same methods already used in unit tests.

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.

Javascript error in simple Aurelia ASP.Net 5.0 RC1 Setup

I am attempting to setup a very basic Aurelia project in ASP.Net 5.0 RC1. I am getting the following JavaScript error after doing a basic initial setup. I am using TypeScript.
Unhandled promise rejection Error: XHR error (404 Not Found) loading http://localhost:5392/core-js.js
Error loading http://localhost:5392/core-js.js as "core-js" from http://localhost:5392/jspm_packages/npm/aurelia-loader#1.0.0-beta.1/aurelia-loader.js
at o (http://localhost:5392/jspm_packages/system.js:4:12694)
at XMLHttpRequest.s.onreadystatechange (http://localhost:5392/jspm_packages/system.js:4:13219)
(anonymous function) # es6.promise.js:138
The setup I did is as follows.
Create Empty ASP.Net 5.0 template.
Install Microsoft.AspNet.StaticFiles from nuget and set up app.UseFileServer.
From git bash run jspm init with the following settings.
Package.json file does not exist, create it? [yes]:
Would you like jspm to prefix the jspm package.json properties under jspm? [yes]:
Enter server baseURL (public folder path) [./]:./wwwroot
Enter jspm packages folder [wwwroot\jspm_packages]:
Enter config file path [wwwroot\config.js]:
Configuration file wwwroot\config.js doesn't exist, create it? [yes]:
Enter client baseURL (public folder URL) [/]:
Do you wish to use a transpiler? [yes]:
Which ES6 transpiler would you like to use, Babel, TypeScript or Traceur? [babel]:typescript
From git bash run jspm install aurelia-framework and jspm install aurelia-bootstrapper.
Add the index.html, app.html, and app.ts file from the aurelia docs.
Fire up IIS Express, load page, get error.
Is there a step I am missing in this setup?

It seems like this is a known issue. The fix is somewhat simple. If you add a core-js mapping at the top of the map section in config.js, it fixes it.
For example,
map: {
"core-js": "npm:core-js#1.2.6",
// other mappings
}

Building Chart.js master - generated .js gives errors

I am getting an error when I work with a version of Chart.js master that I compiled myself. I must be missing some kind of dependency that I've missed in the documentation. I have no clue what .js I need to include.
When I move my mouse-cursor over the chart I get a bunch of errors related to a missing Color library. Which one am I missing exactly?
TypeError: i.color(...).saturate is not a function
Edit:
I have created a JSFiddle here: http://jsfiddle.net/o9ebb5sq/
This piece of code does not show the problem (using Chart 2.0.0-Beta). This is why I copied this release into my software and tried again. The problem I am describing disappears.
I am running a master build (created using 'gulp build') Which makes me think the problem is either present in git master, or it is caused by my build environment.
I have installed the following npm packages before I ran gulp build
gulp 3.9.0
gulp-concat 2.6.0
gulp-connect 2.2.0
gulp-html-validator 0.0.5
gulp-jshint 1.12.0
gulp-karma 0.0.5
gulp-replace 0.5.4
gulp-size 2.0.0
gulp-uglify 1.4.2
gulp-util 3.0.7
semver 5.0.3
karma 0.13.14
inquirer 0.11.0
I expect that maybe I am missing something here or that one of the packages I've used to build Chart.js has an issue.

In the package.json on 2.0 they have included a new dependency "color": "git://github.com/chartjs/color" you will also need to include this. Odd thing is they alias this to a helper
color = helpers.color = function(color) {
if (!window.Color) {
console.log('Color.js not found!');
return color;
}
return window.Color(color);
},
So I would have expected for you to see the log unless you already have something in the global namespace named Color.