all these changes

frontend/node_modules/dnd-core/dist/contracts.js

@@ -0,0 +1,21 @@
+import { invariant } from '@react-dnd/invariant';
+export function validateSourceContract(source) {
+    invariant(typeof source.canDrag === 'function', 'Expected canDrag to be a function.');
+    invariant(typeof source.beginDrag === 'function', 'Expected beginDrag to be a function.');
+    invariant(typeof source.endDrag === 'function', 'Expected endDrag to be a function.');
+}
+export function validateTargetContract(target) {
+    invariant(typeof target.canDrop === 'function', 'Expected canDrop to be a function.');
+    invariant(typeof target.hover === 'function', 'Expected hover to be a function.');
+    invariant(typeof target.drop === 'function', 'Expected beginDrag to be a function.');
+}
+export function validateType(type, allowArray) {
+    if (allowArray && Array.isArray(type)) {
+        type.forEach((t)=>validateType(t, false)
+        );
+        return;
+    }
+    invariant(typeof type === 'string' || typeof type === 'symbol', allowArray ? 'Type can only be a string, a symbol, or an array of either.' : 'Type can only be a string or a symbol.');
+}
+
+//# sourceMappingURL=contracts.js.map