Looks like some upstream project didn’t merge its branches correctly. 
Try removing the node_modules subdirectory completely and then running npm install --no-shrinkwrap. The --no-shrinkwrap option tells npm to use package.json to retrieve the software without using the npm-shrinkwrap.json file. It’s a bit slower to install, but it will pull in the latest packages available for all dependencies.
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@afwang about --no-shrinkwrap I read that “…The --no-shrinkwrap argument, which will ignore an available shrinkwrap file and use the package.json instead.”
But I didn’t understand it fully with respect to appium package installation.
can you please clarify with some examples; how with and without the option; appium package will be installed differently ?