Nuxt•12mo ago

Is it possible to inject (typed) variables on a component by component basis?

I have a form builder use case where a form is comprised of hundreds of steps. each step works on a slice of the form data, so each step should have a typed interface to interact with the bit of state it manages. i could achieve this by calling

useStepFormData<"Step1">

useStepFormData<"Step1">

useStepFormData<"Step1">

useStepFormData<"Step1"> etc in every step component, but I am wondering if I can automate this using a nuxt plugin where the plugin effectively writes the above line at the top of the setup script?

kapa.ai•12/28/24, 11:26 PM

Hi @Felix. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

kapa.ai•12/28/24, 11:27 PM

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Based on the knowledge sources provided, I can offer some insights into your question about injecting typed variables on a component-by-component basis in Nuxt. While there isn't a direct method to automatically inject typed variables for each component as you described, there are a few approaches you can consider:

Auto-imports: Nuxt provides auto-import functionality for components, composables, and utilities. You could potentially create a composable for each step that returns the typed form data, and Nuxt would auto-import it in your components. However, this doesn't solve the issue of having to call the composable in each component.**Nuxt Auto-imports** (<https://nuxt.com/docs/guide/concepts/auto-imports>)
Plugins: You can use Nuxt plugins to provide helpers on the NuxtApp instance. This approach allows you to inject functions or variables that will be available globally, but it doesn't solve the typing issue on a per-component basis.**Using Composables in Plugins** (<https://nuxt.com/docs/guide/directory-structure/plugins#using-composables>)
TypeScript and Vue's defineComponent: You could use TypeScript with Vue's defineComponent to define prop types for each step component. This would provide type safety, but you'd still need to pass the correct slice of form data to each component.

Unfortunately, there isn't a built-in way in Nuxt to automatically inject different typed variables for each component as you described. The approach of calling

useStepFormData<"Step1">

useStepFormData<"Step1">

in each component, while verbose, might be the most straightforward way to achieve strong typing for each step.

kapa.ai•12/28/24, 11:27 PM

If you want to pursue a more automated approach, you might need to create a custom build step or code generation tool that analyzes your components and injects the appropriate useStepFormDatauseStepFormData call. However, this would be a complex custom solution and is not a standard feature of Nuxt.

For your specific use case with hundreds of form steps, you might want to consider a more dynamic approach where you define a generic step component that receives its data and type information as props. This could potentially reduce repetition while maintaining type safety.

Remember that while Nuxt provides many conveniences, some advanced typing scenarios may require custom solutions or careful architecture of your components and data flow.
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kapa.ai•12/28/24, 11:27 PM

@223579303122567168 Kapa.ai is still learning and improving, please let me know how I did by reacting below.

Bootsmann•1/2/25, 1:57 PM

Do you mean as a typed prop?

Is it possible to inject (typed) variables on a component by component basis?

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