npm install ->Failed at the node-sass@4.5.0 postinstall script

Got the same problem (node v10.3.0, ionic 3.13.0). This worked :

try

sudo rm -rf package-lock.json node_modulessudo npm cache clean --forcesudo npm i --unsafe-perm node-sass

angular reactjs npm ionic3 node-sass

Just Try with this command hope it will very helpful.it's working for me

sudo npm install -g node-sass@4.5.0 --unsafe-perm=true --allow-root

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