test(tree-shaking): fix tests on windows
test(tree-shaking): fix tests on windows

fix tests on windows

michaelgeorgeattard/ionic-app-scripts,rolandjitsu/ionic-app-scripts,driftyco/ionic-app-scripts,driftyco/ionic-app-scripts,rolandjitsu/ionic-app-scripts,driftyco/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,rolandjitsu/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts