Add setter to let variables accessors about svelte HOT 3 OPEN

Exporting a let variable in v4 is a property.
The equivalent in v5 should not be an export but a $props() declaration.

(There also is a compiler option legacy.componentsApi which might have an effect on the behavior - see these docs. At the very least you would be able to use $set on the component.)

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You still can export function-setters

export const setMyProp = (v) => { myProp = v; };

or an object with all [writable] props

export const options1 = someStateObject;
export const options2 = {
  get myProp() { return myProp; },
  set myProp(v) { myProp = v; },
};

from svelte.

This was a deliberate choice though I can't exactly remember the rationale. Adding the 5.0 milestone so that we reach a final decision on this before the semver window closes

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