Script to generate node_modules from visual studio XAML build

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Hi i need a script (bat or ps.1) to generate node_modules as they are not checked in by the team to the repository. Im doing a XAML build from Visual Studio IDE the build agent folder is like D:builds\2\projectname\buildname\src\code\. I need the node_modules inside that D:builds\2\projectname\buildname\src\code\ folder where my package.json is and rest of the code is present. I have checked in the ps.1 script with npm install command and passing in the pre-build script section of the process but it is firing at D:builds\2\projectname\buildname\src\ with npm err saying package.json is not found and some npm errs.Can any one help me on this.

What I have tried:

I have checked in the ps.1 script with npm install command and passing in the pre-build script section of the process but it is firing at D:builds\2\projectname\buildname\src\ with npm err saying package.json is not found and some npm errs.Can any one help me on this.
npm install and npm run build are the commands i have kept in the script. Is i need any big change to be made to the script, as i'm not much aware of scripting.