After drop two of the SharePoint SPFx Framework came out on Friday. (https://github.com/SharePoint/sp-dev-docs/wiki/Release-Notes-Drop-2) ... I followed the instructions to upgrade my webpart so:- When I type gulp nuke I get cannot find module gulp-core-build.
C:\XXX\YYY\ZZZ\Documents\SPFx\Projects\SiteInfo-webpart>gulp nuke
module.js:327
throw err;
^
Error: Cannot find module 'gulp-core-build'
at Function.Module._resolveFilename (module.js:325:15)
at Function.Module._load (module.js:276:25)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object. (C:\XXX\YYY\ZZZ\Documents\SPFx\Projects\SiteInfo-webpart\node_modules\@microsoft\sp-build-web\lib\index.js:13:25)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)