svelte-dev-helper

svelte-dev-helper

Helper for svelte components to ease development. Used under the hood by svelte-hot-loader.

Usage

This is meant to be used under the hood for creating a build toolchain, or a dev helper based on Svelte components.

import {Registry, configure, createProxy} from 'svelte-dev-helper';
import Component from './Component.html'; //some svelte component

configure(configOptions);

const id = someUniqueID();

Registry.set(id, {
  rollback: null,
  component: Component,
  instances:[]
});

export createProxy(id);

The component returned by createProxy now has the following features:

1. Adds a <!--<Component>--> comment marker in the DOM just above where the component's DOM starts
2. You can access the component instance using $0.__component__ in devtools after higlighting the comment marker from above.
3. You can access all rendered instances of a particular component using Registry.get(id).instances
4. All instances have a _rerender method
5. If you switch the component in the registry (using Registry.set(id, Registry.get(id).component = newComponent)) all future renders of the component will use the newly switched component.
6. Following a switch as per above, you can switch all rendered components by first accessing the instances and then calling _rerender on them.
7. The rollback property in any Registry item can be used to hold the last good version of a component. If there is an error instantiating a switched component, it will try to use the component version stored in rollback

The Registry is also available at window.__SVELTE_REGISTRY__