From 202eb6e3044bda3407fd3e483e4c3c9aedd7986c Mon Sep 17 00:00:00 2001
From: Chika <djchikalkin@gmail.com>
Date: Tue, 25 Oct 2022 16:53:52 +0300
Subject: [PATCH] tools: add makeDisposable function for mobx reactions

---
 tools/mobx.ts | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 tools/mobx.ts

diff --git a/tools/mobx.ts b/tools/mobx.ts
new file mode 100644
index 0000000..a36643f
--- /dev/null
+++ b/tools/mobx.ts
@@ -0,0 +1,23 @@
+/* eslint-disable import/prefer-default-export */
+import type { IReactionDisposer } from 'mobx';
+import { autorun } from 'mobx';
+
+export function makeDisposable(
+  createReaction: () => IReactionDisposer,
+  mustBeDisposed: () => boolean
+) {
+  let disposer: IReactionDisposer | undefined;
+
+  function cleanDisposer() {
+    disposer = undefined;
+  }
+
+  autorun(() => {
+    if (mustBeDisposed()) {
+      if (disposer !== undefined) disposer();
+      cleanDisposer();
+    } else {
+      disposer = createReaction();
+    }
+  });
+}