[client] Migrate client/models to typescript.
This MR migrates models.js to typescript. This is a fist step to type the client, and add proper tests to the CI.
You don't pay for Framagit, because it is funded by donations to Framasoft. Our not-for-profit needs any support you can afford: support.framasoft.org.
Framagit est gratuit car il est financé par les dons à Framasoft. Notre association a besoin de votre soutien sur soutenir.framasoft.org.
This MR migrates models.js to typescript. This is a fist step to type the client, and add proper tests to the CI.