Make an assignment reactive without $: if it has reactive dependencies

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+- Start Date: 2023-01-01
+- RFC PR: (leave this empty)
+- Svelte Issue: (leave this empty)
+
+# Make an assignment  reactive without $: if it has reactive dependencies
+
+## Summary
+
+> It would be nice to have plain/concise assignment without redundant `$:` for variables that have reactive dependencies.
+
+## Motivation
+
+This is how we do now
+```js
+let count = 1
+$: doubled = count * 2
+```
+
+And this is how it can be
+
+```js
+let count = 1
+let doubled = count * 2
+```
+
+In case if we need one time `doubled` to be non reactive we could define it like
+```js
+const doubled = count * 2
+```