fix(runtime-core): component methods should override global properties in DEV (#3074)

packages/runtime-core/src/componentOptions.ts

@@ -604,7 +604,17 @@ export function applyOptions(
     for (const key in methods) {
       const methodHandler = (methods as MethodOptions)[key]
       if (isFunction(methodHandler)) {
-        ctx[key] = methodHandler.bind(publicThis)
+        // In dev mode, we use the `createRenderContext` function to define methods to the proxy target,
+        // and those are read-only but reconfigurable, so it needs to be redefined here
+        if (__DEV__) {
+          Object.defineProperty(ctx, key, {
+            value: methodHandler.bind(publicThis),
+            configurable: true,
+            enumerable: false
+          })
+        } else {
+          ctx[key] = methodHandler.bind(publicThis)
+        }
         if (__DEV__) {
           checkDuplicateProperties!(OptionTypes.METHODS, key)
         }