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Updating the vue-loader module did the trick, through the task runner was still showing an error it was building correctly when webpack –watch –color was ran in powershell:
npm install vue-loader@14.2.2
https://github.com/vuejs/vue-loader/issues/1177
…the problem in Visual Studio was that Task Runner was using the webpack in node_modules/.bin folder. To rectify this, go to Tools -> Options -> Projects and Solutions -> Web Package Management and move the $(PATH) entry to the top of the list (as per Task Runner Configuration Missing in Visual Studio 2017)
Source:stackexchange.com