Failed to replace env in config: ${APPDATA}

Phonegap installation using "npm" throws error on Windows7

Failed to replace env in config: ${APPDATA}

Solution:

Edit file "npmrc" located at:

C:\nodejs\node_modules\npm

Replace the following line:

prefix=${APPDATA}\npm

with

prefix=C:\nodejs\node_modules\npm\npm

Save the file and run the command again:

C:\ npm install -g phonegap

It will now install phonegap successfully :)

After that - another important step is to update PATH variable of system environment, otherwise, when you run below command:
phonegap create my-app
You will run into error - phonegap command not recognised.
To avoid this error, edit PATH with following value:
C:\nodejs\node_modules\npm\npm

If nothing works fine, then close the command prompt and open new one. 
First verify correct path value and then run phonegap command.
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Source: https://github.com/npm/npm/issues/2840