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

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 ?

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SyantaxError: Unexpected token '<' ESMLoader.moduleStrategy ....how I fix it

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)

how do i fix SyntaxError: Unexpected identifier while i try to create new project on react-native?

Welcome to React Native!
Learn once, write anywhere
× Downloading template
error SyntaxError: Unexpected identifier.
Error: SyntaxError: Unexpected identifier
at createFromTemplate (C:\Users\Yomira\AppData\Local\npm-cache_npx\7930a8670f922cdb\node_modules#react-native-community\cli\build\commands\init\init.js:129:11)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.initialize [as func] (C:\Users\Yomira\AppData\Local\npm-cache_npx\7930a8670f922cdb\node_modules#react-native-community\cli\build\commands\init\init.js:181:3)
at async Command.handleAction (C:\Users\Yoemphasized textmira\AppData\Local\npm-cache_npx\7930a8670f922cdb\node_modules#react-native-community\cli\build\index.js:106:9)
info Run CLI with --verbose flag for more details.**

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/

JavaScript JSON.parse, find unexpect token position

Anybody have a clue how to find the unexpected token?
I am using JavaScript JSON.parse to parse a string with \" escape.
The problem is my program is complaining about there is a unexpect token.
How can i find out where is that token in the string? like line number or column number?
Thank you so much
Errors
SyntaxError: Unexpected token
message: "Unexpected token "
stack: "SyntaxError: Unexpected token ↵ at Object.parse (native)↵ at FileReader.eval (eval at evaluate (unknown source), <anonymous>:2:6)↵ at FrameMirror.evaluate (native)↵ at Object.evaluate (<anonymous>:415:28)↵ at Object.InjectedScript._evaluateOn (<anonymous>:668:39)↵ at Object.InjectedScript._evaluateAndWrap (<anonymous>:607:52)↵ at Object.InjectedScript.evaluateOnCallFrame (<anonymous>:718:21)↵ at FileReader.r.onload >(http://*******/uploadwave/uploadwave.js:77:37)"
get stack: function () { [native code] }
set stack: function () { [native code] }
__proto__: Error

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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