1 files changed, 18 insertions, 0 deletions
diff --git a/excalidraw-app/data/Locker.ts b/excalidraw-app/data/Locker.ts
new file mode 100644
index 0000000..c99673e
--- /dev/null
+++ b/excalidraw-app/data/Locker.ts
@@ -0,0 +1,18 @@
+export class Locker<T extends string> {
+  private locks = new Map<T, true>();
+
+  lock = (lockType: T) => {
+    this.locks.set(lockType, true);
+  };
+
+  /** @returns whether no locks remaining */
+  unlock = (lockType: T) => {
+    this.locks.delete(lockType);
+    return !this.isLocked();
+  };
+
+  /** @returns whether some (or specific) locks are present */
+  isLocked(lockType?: T) {
+    return lockType ? this.locks.has(lockType) : !!this.locks.size;
+  }
+}