Add way to release memory management of callbacks to JS GC (#20)

src/request/database/macros.rs

@@ -27,6 +27,14 @@ macro_rules! impl_database_request {
             {
                 self.inner.on_upgrade_needed(callback)
             }
+
+            /// Release memory management of the callbacks to JS GC.
+            ///
+            /// > Note: This may leak memory. Read more about it
+            ///   [here](https://docs.rs/wasm-bindgen/latest/wasm_bindgen/closure/struct.Closure.html#method.into_js_value).
+            pub fn forget_callbacks(&mut self) {
+                self.inner.forget_callbacks()
+            }
         }
 
         impl crate::Request for $type {

src/request/database/mod.rs

@@ -66,6 +66,33 @@ impl DatabaseRequest {
             .set_onupgradeneeded(Some(closure.as_ref().unchecked_ref()));
         self.upgrade_needed_callback = Some(closure);
     }
+
+    /// Release memory management of the callbacks to JS GC.
+    ///
+    /// > Note: This may leak memory. Read more about it
+    ///   [here](https://docs.rs/wasm-bindgen/latest/wasm_bindgen/closure/struct.Closure.html#method.into_js_value).
+    pub fn forget_callbacks(&mut self) {
+        let success_callback = self.success_callback.take();
+        let error_callback = self.error_callback.take();
+        let blocked_callback = self.blocked_callback.take();
+        let upgrade_needed_callback = self.upgrade_needed_callback.take();
+
+        if let Some(callback) = success_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = error_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = blocked_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = upgrade_needed_callback {
+            callback.forget();
+        }
+    }
 }
 
 impl Request for DatabaseRequest {

src/request/store/macros.rs

@@ -6,6 +6,16 @@ macro_rules! impl_store_request {
             inner: $base_request,
         }
 
+        impl $type {
+            /// Release memory management of the callbacks to JS GC.
+            ///
+            /// > Note: This may leak memory. Read more about it
+            ///   [here](https://docs.rs/wasm-bindgen/latest/wasm_bindgen/closure/struct.Closure.html#method.into_js_value).
+            pub fn forget_callbacks(&mut self) {
+                self.inner.forget_callbacks();
+            }
+        }
+
         impl crate::Request for $type {
             type Event = $event;
 

src/request/store/mod.rs

@@ -26,6 +26,25 @@ pub struct StoreRequest {
     error_callback: Option<Closure<dyn FnMut(Event)>>,
 }
 
+impl StoreRequest {
+    /// Release memory management of the callbacks to JS GC.
+    ///
+    /// > Note: This may leak memory. Read more about it
+    ///   [here](https://docs.rs/wasm-bindgen/latest/wasm_bindgen/closure/struct.Closure.html#method.into_js_value).
+    pub fn forget_callbacks(&mut self) {
+        let success_callback = self.success_callback.take();
+        let error_callback = self.error_callback.take();
+
+        if let Some(callback) = success_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = error_callback {
+            callback.forget();
+        }
+    }
+}
+
 impl Request for StoreRequest {
     type Event = Event;
 

src/transaction/mod.rs

@@ -101,6 +101,28 @@ impl Transaction {
             .set_onerror(Some(closure.as_ref().unchecked_ref()));
         self.error_callback = Some(closure);
     }
+
+    /// Release memory management of the callbacks to JS GC.
+    ///
+    /// > Note: This may leak memory. Read more about it
+    ///   [here](https://docs.rs/wasm-bindgen/latest/wasm_bindgen/closure/struct.Closure.html#method.into_js_value).
+    pub fn forget_callbacks(&mut self) {
+        let abort_callback = self.abort_callback.take();
+        let complete_callback = self.complete_callback.take();
+        let error_callback = self.error_callback.take();
+
+        if let Some(callback) = abort_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = complete_callback {
+            callback.forget();
+        }
+
+        if let Some(callback) = error_callback {
+            callback.forget();
+        }
+    }
 }
 
 impl TryFrom<EventTarget> for Transaction {