Tutorial - Grafana rendering on Raspberry Pi

Hello,

sorry, but i did not understood this lines. It must looks so Screenshot by Lightshot ?

after this i get error

[23:13:11] root@openhab:/var/lib/grafana/plugins/grafana-image-renderer# yarn run build
yarn run v1.19.1
$ yarn run tsc
error Command "tsc" not found.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

How it can be fixed?

I am on OH 2.5M4 on Pi4