I can only speak from a node developer perspective but deno makes some promises that I would consider absolute killer features should they work as advertised:

- no hassle with `node_modules`

- no hassle with `npm install` and `npm ci`

- no hassle with `package-lock.json`

- no hassle with `node-gyp`

- no hassle with setting up Typescript

On the nice to have side I would mention:

- opinionated take on linting, testing and formatting

- possibility to compile into self-contained executables