error An unexpected error occurred: “https://registry.yarnpkg.com/<package name>: self signed certificate in certificate chain”.

NPM / Yarn

npm config set strict-ssl false
yarn config set strict-ssl false 

详情：https://medium.com/@znouira/ssl-npm-or-yarn-error-77fd80e3d73f

https://stackoverflow.com/questions/30984239/tsd-error-self-signed-certificate-in-certificate-chain