refactor(runtime-core): replaced with optional chaining operator

Author: cuixiaorui

packages/runtime-core/src/apiInject.ts

@@ -17,8 +17,8 @@ export function provide<T>(key: InjectionKey<T> | string | number, value: T) {
     // own provides object using parent provides object as prototype.
     // this way in `inject` we can simply look up injections from direct
     // parent and let the prototype chain do the work.
-    const parentProvides =
-      currentInstance.parent && currentInstance.parent.provides
+
+    const parentProvides = currentInstance.parent?.provides
     if (parentProvides === provides) {
       provides = currentInstance.provides = Object.create(parentProvides)
     }