The token '&&' is not a valid statement separator in this version

Question

On the way of installing Webpack on my React Project, the following problem hinders my progress:

last step to configure the Webpack

npm run build && node ./dist/main.js

Error on Windows Power Shell / on Visual Studio Code

PS C:\Users\pythonbuddha\Desktop\to_experiment\to-do-list> npm run build && node ./dist/main.js
At line:1 char:15
+ npm run build && node ./dist/main.js
+               ~~
The token '&&' is not a valid statement separator in this version.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : InvalidEndOfLine

Tutorial which promised to configure the webpack

https://developerhandbook.com/webpack/webpack-4-from-absolute-scratch/

https://developerhandbook.com/webpack/how-to-configure-scss-modules-for-webpack/

Answer 1

It's because you're in PowerShell, try running it in CMD or Git Bash

Alternatively (if you wish to continue in PS):

(npm run build) -and (node ./dist/main.js)

3rd Alternative, just run them separetly,

Answer 2

I found that within PowerShell as my terminal within VS Code, replacing && in the command with ; did the trick.

Answer 3

PowerShell (Core) v7+ - but not Windows PowerShell - now does support && and ||, the pipeline-chain operators, so your command should work as-is there - see this answer for PowerShell-specific considerations for their use; see below for Windows PowerShell workarounds.

Conceptual note:

• In all shells that support it (notably cmd.exe and POSIX-compatible shells such as Bash), && conditionally sequences commands: it executes its RHS command only if the LHS command indicated success; || is the inverse: it executes the RHS only if the LHS indicated failure.

• This is important for preventing execution when it makes no sense to do so; e.g., in
  npm run build && node ./dist/main.js it only makes sense to run what was just built (with node) if the build succeeded, which is what && ensures.

Windows PowerShell workarounds:

The most succinct workaround:

npm run build; if ($?) { node ./dist/main.js }

This builds on the automatic $? variable, which is a Boolean indicating whether the most recent command succeeded.

The most robust workaround, needed if the commands use 2> redirections:

npm run build; if ($LASTEXITCODE -eq 0) { node ./dist/main.js }

Basing the success test on the automatic $LastExitCode variable, which reflects the process exit code of the most recently executed external program, avoids problems in Windows PowerShell^[1] where the presence of stderr output in combination with redirecting it via 2> mistakenly sets $? to $false even when the process exit code is 0.

---

^{[1] The problems with 2> redirections are summarized in this answer. They also plague PowerShell (Core) up to version 7.1}

Answer 4

The && operator is used in linux bash to run both commands after each other. (Also if the first command fails, the second won't be executed)

This does not work in PowerShell on Windows so just split both commands and run them separately:

npm run build
node ./dist/main.js

---

For completeness, Powershell can behave the same when you do (command1) -and (command2) and && might actually work depending on your PowerShell version.

See this for further info: https://stackoverflow.com/a/564092/2232127

Answer 5

I have solved the issue by upgrading powershell and renamed dir. path folder name by removing spaces. Now it works properly.

Powershell upgradation link

https://github.com/PowerShell/PowerShell#get-powershell

Answer 6

Since some people might arrive here in the same manner as I did, wondering why PowerShell would not allow me to perform a conditional AND operator between two variables within an if statement.

I solved it by evaluating the Left Condition with an If condition, and then the Right Condition immediately within the first true condition.

Example that produced the error:

$Path = "C:\\Temp\test"
$RootPath = "C:\\Temp"
$currentChildren = Get-ChildItem -Force -LiteralPath $Path 
$isEmpty = $currentChildren -eq null

if ($isEmpty && $Path -ne $RootPath) {
    Remove-Item -Force -LiteralPath $Path
    }

$foo = "question"
$bar = "answer"

Example that I used to solve the problem:

$Path = "C:\\Temp\test"
$RootPath = "C:\\Temp"
$currentChildren = Get-ChildItem -Force -LiteralPath $Path 
$isEmpty = $currentChildren -eq null

if ($isEmpty) {
    if ($Path -ne $RootPath) {
        Remove-Item -Force -LiteralPath $Path
        }
   }

Answer 7

Having this issue on the Windows terminal. Solution is to use ; instead && like:

git fetch --all ; git add --all ; git commit -m 'updating things' ; git push

Answer 8

in the ps terminal for vs code or phpstorm just replace the && with , and hit run Instead of

npm install && npm run dev

Do

npm install; npm run dev

Answer 9

This works for me:

npm run build; if ($?) { node ./dist/main.js }

Just like the command in cmd:

npm run build && node ./dist/main.js

Answer 10

this works just fine using Git bash.

just check it out...

Example

user@DevKitchen MINGW64 ~/OneDrive/Documents/BL_proxy/portfolio (master) $ cd src && mkdir content && cd content && touch navbar.js about.js services.js projects.js