getting error on npm run build error on visualization

[spammenot66]

I'm trying to create

I'm following all steps from the custom visualization tutorial. After i enter " npm run build"  on the /opt/splunk/etc/apps/testchart/appserver/static/visualization/testchart folder, it throws the error

ERROR in ./~/xmlhttprequest/lib/XMLHttpRequest.js
Module not found: Error: Cannot resolve module 'child_process' in /opt/splunk/etc/apps/testchart/appserver/static/visualizations/testchart/node_modules/xmlhttprequest/lib
@ ./~/xmlhttprequest/lib/XMLHttpRequest.js 15:12-36

ERROR in ./~/xmlhttprequest/lib/XMLHttpRequest.js

any input would be greatly appreciated.
Module not found: Error: Cannot resolve module 'fs' in /opt/splunk/etc/apps/testchart/appserver/static/visualizations/testchart/node_modules/xmlhttprequest/lib
@ ./~/xmlhttprequest/lib/XMLHttpRequest.js 16:9-22

Is this due to code that i've copied incorrectly or something else?

[spammenot66 · Accepted solution]

this seems to resolve my issue. 

The true solution to this seems to be to add target: 'node' to your module.exports object in webpack.config.js. At least, that was the solution for me.