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Support generic type parameters #113

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ethanchristensen01
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This update enables type checking scoped slots, and by extension, lets developers get type completions while writing the #item slot.

There is a "breaking change" to consider here: to access the type of the component, we can no longer use InstanceType<typeof sortable>, because it doesn't work with generic components. We have to replace InstanceType with ComponentExposed as described in this issue: Cannot use InstanceType<typeof Comp>> on generic components.

This requires adding 'vue-component-type-helpers' (from the official Vue Language Tools repository) as a dev dependency.

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@ethanchristensen01
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Here's a screenshot of the type-hint you get in vs-code while hovering over the item slot of HelloWorld.vue. It automatically infers this from the type of the items parameter.
image

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