It seems that some of the packages are no longer compatible:
npm ERR! Could not resolve dependency:
npm ERR! peer graphql@"^0.6.0 || ^0.7.0 || ^0.8.0-b || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0" from graphiql@0.12.0
npm ERR! node_modules/graphiql
npm ERR! graphiql@"^0.12.0" from the root project
It seems that some of the packages are no longer compatible:
npm ERR! Could not resolve dependency:
npm ERR! peer graphql@"^0.6.0 || ^0.7.0 || ^0.8.0-b || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0" from graphiql@0.12.0
npm ERR! node_modules/graphiql
npm ERR! graphiql@"^0.12.0" from the root project