firebase-tools install throws 'root does not have permission' error repeatedly

During installtion of firebase-tools, you see a repeated output about ‘root does not have permission’ error. This is one way to fix that issue.

sudo npm install -g firebase-tools

Error/Warning

gyp WARN EACCES user "root" does not have permission to access the dev dir "/usr/local/lib/node_modules/firebase-tools/node_modules/grpc/.node-gyp/8.9.1"
gyp WARN EACCES attempting to reinstall using temporary dev dir "/usr/local/lib/node_modules/firebase-tools/node_modules/grpc/.node-gyp"

Here is what I did to avoid this:

sudo mkdir -p /usr/local/lib/node_modules/firebase-tools/node_modules/grpc/.node-gyp/8.9.1/

This creates an empty directory with the path specified then rerun the following:

$ sudo npm install -g firebase-tools
Password: ###YOUR_PASSWORD_HERE###
/usr/local/bin/firebase -> /usr/local/lib/node_modules/firebase-tools/bin/firebase
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I hope this helps.

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