[Feature] Restrict the value types of builtin functions.

[MuhamedMagdi]

Is your feature request related to a problem? Please describe.
Right now the built in functions doesn't have any restriction regarding the type. so we can for example cd [path] or mv file null.

Describe the solution you'd like
Throws an error in compile time as it will always fails

Describe alternatives you've considered
should we restrict these values to only be of type Text?

Additional context
I can work in this issue if it's a valid solution.

[Ph0enixKM]

Let's restrict them to Text. Maybe in the future we'll add some Path type. Let's keep it simple for now