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Prompt Dependency

As stated previously, a prompt dependency is a dependency that is resolved by some kind of user interaction, either by a given argument or as an answer to a prompted question.


userInputType - string

There are different types of prompt dependencies: ‘argument’, ‘input’, ‘chooseOne’, ‘chooseMultiple’

The ‘argument’ prompt dependency is a special kind of dependency. The user is not necessarily prompted for it, it can be ‘pre supplied’, for example in the case of a command line argument to a command.

The ‘input’ prompt dependency is just a text input prompt.

The ‘chooseOne’ prompt dependency prompts the user to choose one item from the list of choices.

The ‘chooseMultiple’ prompt dependency prompts the user to choose zero or more items from the list of choices.

promptMessage - string

Is the message that the user is prompted with.

optional (optional) - boolean

Denotes whether this dependency is optional or required. Default value is false.

The most likely use of optional dependencies, for example in the case of a CLI, would be options.

$ program <command> <requiredDependency> <--optionalDependency>  

choices (optional) - list of strings

Is a list of choices given to the user.

customInput (optional) - string

Can be used to denote a ‘custom input: ‘ choice when userInputType is ‘chooseOne’ or ‘chooseMultiple’.

Note since this concerns ‘non-argument’ prompt dependencies and that the tool built upon the Tooling Platform would need to create its own prompt dependency resolver, there are no concrete implementation manipulating the ‘customInput’ field. So how it is handled is up to the tool.


When developing an application that uses the Tooling Platform one would have to create an implementation of a dependency resolver that can resolve prompt dependencies. This is simply because there is no way for the dependency system to infer how a prompt dependency is resolved.

In a typescript application this could simply be done by having a class implement the ICanResolveSyncDependencies interface.

export class PromptDependencyResolver implements ICanResolveDependencies  {
    canResolve(dependency: IDependency): boolean {
        return whether_dependency_is_the_type_of_prompt_dependency_this_resolver_can_resolve
    resolve(context: any, dependencies: IDependency[], destinationPath?: string, coreLanguage?: string, args?: string[]) {
        return context_with_resolved_dependencies

And then you would have to add this resolver to the dependency system.

import {dependencyResolvers} from '@dolittle/tooling.common.dependencies';

dependencyResolvers.add(new PromptDependencyResolver())

There is, however, one exception. A dependency resolver for prompt dependencies with userInputType of ‘argument’ is already shipped with the dependency system. The idea is that ‘argument’ prompt dependencies are ‘pre supplied’, so no further prompting would be necessary.

Note that in the scenario of a CLI this would make sense, but not necessarily for an editor extension.

The argument dependency resolvers requires the arguments (optional or required) to be given to the resolve method, they are not prompted to the user as normal prompt dependencies. But in the case for an editor extension, for example for vscode, the user would have to be prompted for these dependencies (like a normal prompt dependency). However solving this should be trivial in most cases. One could for example filter all dependencies for the ones where userInputType equals ‘argument’ and create prompts for them and fill up the arguments list before passing the dependencies over to the resolve method.