persist drafts in memory (#155)

Co-authored-by: userAdityaa <aditya.chaudhary1558@gmail.com>
Co-committed-by: userAdityaa <aditya.chaudhary1558@gmail.com>

src/app/util/drafts.ts

@@ -0,0 +1,21 @@
+const store = new Map<string, unknown>()
+
+export class DraftKey<T> {
+  constructor(private key: string) {}
+
+  get(): T | undefined {
+    return store.get(this.key) as T | undefined
+  }
+
+  set(value: T): void {
+    store.set(this.key, value)
+  }
+
+  update(value: Partial<T>): void {
+    this.set({...this.get(), ...value} as T)
+  }
+
+  clear(): void {
+    store.delete(this.key)
+  }
+}