`ts-node` is now an optional peer dependency of the shared dev-infra
package. Whenever a `ng-dev` command runs, and a TypeScript-based
configuration file exists, `ts-node` is set up if available.
That allows consumers of the package (as the components repo) to more
conveniently use a TypeScript-based configuration for dev-infra.
Currently, commands would need to be proxied through `ts-node`
which rather complicates the setup:
```
NG_DEV_COMMAND="ts-node ./node_modules/@angular/dev-infra-private/cli.js"
```
I'm thinking that it should be best-practice to use TypeScript for
writing the configuration files. Given that the tool is used primarily
in Angular projects (for which most sources are TypeScript), this should
be acceptable.
PR Close#37196
Paul Gschwendtner