That being said, TBH I don't see any real scenario where I would "prototype a CLI". Unlike a GUI where elements can be placed in some places vs others, a CLI is a CLI.

For any developer, it would probably take less time to write it directly using one of the libraries listed here : https://bloomberg.github.io/stricli/blog/intro (TS/JS) or https://github.com/spf13/cobra (Go) with stub implementations for commands.

The main problem for me is that defining the CLI in a JSON file lacks all the flexibility of code (reusability, etc.).

It includes a simple react-native target to show how to do it. To make things easier to understand, I've also revamped the documentation, added a Guide to create your own target and enhanced the Tutorial with a RN target.

Finally, I've added the Tutorial code in the repo for whoever wants to browse it without necessarily performing all the steps.

Thanks a lot again for your feedback. My email is open :)

That's a fair point. I will add more details on how each of these notions translates to TypeScript. Quickly :

  - UseCase : a file containing the use case definition
  - App : a directory with a use cases folders and metadata (i18n, metadata)
  - Product : a directory with a apps folders and metadata (i18n, metadata)
  - Target : depends on it by for a GUI it's the screens where use cases are injected

I'm not a huge fan of this name either, but couldn't come up with something better at this time. `Module` seemed to broad to me. Although the notion is not totally clear to you, do you have any ideas in mind ?

I agree that it's not as straightforward as other solutions at this moment. I'll keep working and improving this to reduce the time needed to get started.

In my case, I'm using the word because the library defines a set of rules and conventions to follow. They are indeed based on my experience.

Are they perfect ? Probably not. And I'm totally open to review them if I missed things. That's how we all learn. Like any model (in a mathematical way), it is an approximation of the actual problem.

Let's say you want to create a product with auth and crud for contacts. You'll have a SignInUCD, a CreateContactUCD, a AddPhoneNumberToContactUCD, etc.

As you said, your react-native target will define the UI screens. You are free to design them the way you want as the library does not make any assumptions about the UI/UX. In every screen where you want to "inject" a use case, you'll use the `useUC` hook and `<UCPanel uc={uc} />` (see https://github.com/c100k/libmodulor/tree/master/dist/esm/tar...). See also https://github.com/c100k/libmodulor/blob/master/docs/getting.... It explains for web, but the mechanics are the same.

Since react-native expects `<View>`, `<Text>` and not `<div>`, etc. you'll also need to define your "design system", like it's been done here for example : https://github.com/c100k/libmodulor/tree/master/dist/esm/tar.... Basically, you need to define how you want a use case form to be displayed, etc. When in web we rely on `<input>`, in react-native we'll rely on `<TextInput>`. And of course, according to the data type, you can display a specific form control.

I realize it's super hard to explain and I'm not clear enough but hopefully I'll find the best way to express it.

To continue with this example, you would add a <UCEntrypoint uc={uc} /> in your webpage, referencing EditProfileUCD. According to the client policy defined in the UCD and the UC auth, the button "Edit Profile" will show up or not. You can also simply disable it.

And your Dialog would render a <UCPanel uc={uc} /> that will display the form based on the UC input. Check out the contract of UCPanel (https://github.com/c100k/libmodulor/tree/master/dist/esm/tar...) to see how you can design the form and the form fields. Ideally, you would design these only once, and use <UCPanel uc={uc} /> across your whole codebase.

> said in another way: many of the people on HN have a backend api, a react SPA, and a mobile app. what types of problems do i have now which libmodulor solves?

In this typical architecture, you would benefit a lot from libmodulor. All your business functionality would be expressed as individual use cases, organized in apps corresponding to your business domain. You would have a server target (backend api), a react-web target (react SPA), a react-native target (mobile app). Each of them will bind the appropriate things in their container. The API endpoints will be automatically mounted in your backend API. They correspond to UCDs having a server lifecycle. Adding a <UCPanel uc={uc} /> in react web or react-native will render the same UC for each platform and submit it automatically to the server, without you having to do any plumging whatsoever. You are totally free to expose a UC in web but not in react-native.

> do i get a mono-build-system, where everything flows together and i just say "libmodulor build" and "libmodulor deploy" and I'm good to go?

This is clearly an important part that is non-existent at this time. For my own products for instance, I deploy each based on the target used (push on a PaaS for a server target, webpack/vite for a web target, fastlane for a react-native target, etc.)

If you have some time, I highly recommend to follow the "Getting Started", showing you how you can multiply the targets, re-using the apps as is.

Thanks a lot for your questions, they help me a lot to see where I fail to explain and how I can simplify things.

Source?

The main problems I have with these kind of solutions are :

- Having to make an HTTP request to get a variable (or multiple ?) for my local function to do its job. And that's a clear no-go for me, in terms of latency

- Having variables stored "somewhere else" complexifies the rollout of new features introducing new "variables", as one needs to update the external tool (here Varse), to create this variable

- Overtime, you end up with a big bag of obsolete variables that are not used anymore by the main application because you forget to remove them

The usual combo "Environment Variable / Restart" proposed by most PaaS offerings will be hard to fight IMO.

In any case, good luck with this project.