In your package.json, change the version of gulp-if from ^1.2.5 to ^2.0.1, then run npm install to update it. This worked for me. I’m not sure why, but…it did. 
4 Likes
In your package.json, change the version of gulp-if from ^1.2.5 to ^2.0.1, then run npm install to update it. This worked for me. I’m not sure why, but…it did.