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0000-built-in-actions.md

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  • Start Date: 2020-06-12
  • RFC PR:
  • Svelte Issue:

Built-in Actions

Summary

This RFC proposes the idea of having a number of common built-in actions much like there are built-in transitions.

Motivation

Actions are currently a bit of a mystery to a lot of people but are incredibly powerful. Having a number of ready-made actions would increase the simpleness of getting started and adds ease-of-use to beginners of Svelte.

This is one of those things that blows minds when they first see it, much like the transitions. It would greatly ease efforts to market Svelte as the framework that people should use.

Detailed design

Much like the svelte/transition package a svelte/action package could be created. You would import them like so: import { longPress } from 'svelte/action'. In here we would put whatever actions that would make sense to put here. These could be actions such as:

  • use:longpress
  • use:clickOutside
  • use:lazyload
  • use:debugFlash

Determining what actions should and should not be included needs to be discussed.

How we teach this

There are no real new concepts added by this RFC but I can see how we would probably want to add one or two new Tutorials and Examples. The documentation would need to be expanded a bit to also show off these actions, much like how transitions are described there.

Drawbacks

The first one is documentaiton. This would probably require the most work in the short-term but I think it would be a pretty straight-forward thing once the actual actions that are included are decided.

The other downside is that the amount of code to maintain increases. We would have to update and keep these actions working but unless the syntax changes radically or the concept of actions is going away (😡) I think it might be worth it.

Alternatives

There are probably not any other alternatives to this, apart from not doing it.

Unresolved questions

The obvious question here would be to decide what actions should be included. What are some popular use-cases that would fit well here?