WebViewJavascriptBridge Unexpected token var line:1 error for android - javascript

I'm using WebViewJavascriptBridge link here. It gives me always error that
D/test: user_client.js called! line:1
D/test: onPageFinished
D/test: Uncaught SyntaxError: Unexpected token var line:1
Please check the last line, it gives error.

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I face this issue while running my react App.js file on vsCode. How do I fix it?
The error is-->
SyntaxError: Unexpected token '<' at ESMLoader.moduleStrategy (node:internal/modules/esm/translators:115:18) at ESMLoader.moduleProvider (node:internal/modules/esm/loader:289:14) at async link (node:internal/modules/esm/module_job:70:21)

Unexpected property: 'cookieStoreId' in tabs.create()

chrome.tabs.create({cookieStoreId:"4"})
When i am trying to use above code in chrome extension it is showing following error:
Uncaught TypeError: Error in invocation of tabs.create(object createProperties, optional function callback): Error at parameter 'createProperties': Unexpected property: 'cookieStoreId'.
at :1:13
I am following documentation of :
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/create
https://docs.w3cub.com/web_extensions/api/tabs/create
I have also included permissions of cookies in manifest.

How to fix the jest SyntaxError: Unexpected token '||='

Here is my code which work nice in browser:
addon.addonRun ||= () => { };
But when I run unit tests in jest, I get this error:
SyntaxError: Unexpected token '||='
How to fix this error ?

Syntax error on async function as object field

I'm have a problem on the simple Getting started tutorial of FeathersJS.
I copy/past both code and run the server, but it return me a Syntax Error on client.js line 5:
app.use('todos', {
async get(name) {
^^^^^^^^^^^^^^^^^
> Uncaught SyntaxError: Unexpected identifier
What did I miss ?
EDIT: I forgot to say that error come from the browser after I run
http-server public/

Reserved Word error

I have the following piece of code in Coffee-script
class #Badge
setIssues: (count)->
#count = count
#render()
When I run my script, I get the following error ,
Uncaught Syntax-Error: Unexpected reserved word
I am complete newbie in Coffee-script , so totally off-guard as of how to fix this error
I tried removing the word 'class' , hence removing the first line(including #Badge), as it is mentioned here , that 'class' is a reserved word . On doing so , it resulted in the error ,
Uncaught SyntaxError: Unexpected token >
How can i fix this error ?

Your two errors:
Uncaught Syntax-Error: Unexpected reserved word
Uncaught SyntaxError: Unexpected token >
suggest that you're trying to run CoffeeScript code as though it was JavaScript. You need to compile your CoffeeScript to JavaScript before you can run it in a JavaScript environment.
See the fine manual for details:
Usage
"text/coffeescript" Script Tags

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