initial commit

1 files changed, 22 insertions, 0 deletions

diff --git a/src/stores/lib/Reaction.js b/src/stores/lib/Reaction.js
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index 000000000..e9bc26d81
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+++ b/src/stores/lib/Reaction.js
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+// @flow
+import { autorun } from 'mobx';
+
+export default class Reaction {
+  reaction;
+  hasBeenStarted;
+  dispose;
+
+  constructor(reaction) {
+    this.reaction = reaction;
+    this.hasBeenStarted = false;
+  }
+
+  start() {
+    this.dispose = autorun(() => this.reaction());
+    this.hasBeenStarted = true;
+  }
+
+  stop() {
+    if (this.hasBeenStarted) this.dispose();
+  }
+}