fix: Make IAtom['reportObserved'] return boolean (#3193)

* Make `IAtom['reportObserved']` return `boolean` This is more like [the docs](https://mobx.js.org/custom-observables.html#atoms) * Create beige-goats-vanish.md Co-authored-by: urugator <11457665+urugator@users.noreply.github.com>
mobxjs · Nov 24, 2021 · 9d5e65c · 9d5e65c
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diff --git a/.changeset/beige-goats-vanish.md b/.changeset/beige-goats-vanish.md
@@ -0,0 +1,5 @@
+---
+"mobx": patch
+---
+
+Make `IAtom['reportObserved']` return `boolean`
diff --git a/packages/mobx/src/core/atom.ts b/packages/mobx/src/core/atom.ts
@@ -17,7 +17,7 @@ import {
 export const $mobx = Symbol("mobx administration")
 
 export interface IAtom extends IObservable {
-    reportObserved()
+    reportObserved(): boolean
     reportChanged()
 }