Install brew if you haven't already. See brew website.
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
Install mkcert:
brew install mkcert
(Optional) Install certutil for Firefox support:
brew install nss
Create a new local Certificate Authority (CA):
mkcert -install
Create a certificate for the "localhost" domain. First, navigate to the repos parent directory. This is important because npm script configured to read key and cert from parent's dir. Then run mkcert:
mkcert localhost
Run local ssl proxy:
npm run https