For issue TypeStrong/ts-node#754
git clone https://github.com/lukaselmer/reproduce-slow-ts-node reproduce-slow-ts-node-v7
cd reproduce-slow-ts-node-v7
npm i
npm start
npm start
git clone https://github.com/lukaselmer/reproduce-slow-ts-node reproduce-slow-ts-node-v8
cd reproduce-slow-ts-node-v8
git checkout v8
npm i
npm start
npm start