add has_prop helper

Author: Rich-Harris

src/runtime/internal/Component.ts

@@ -1,6 +1,6 @@
 import { add_render_callback, flush, schedule_update, dirty_components } from './scheduler';
 import { current_component, set_current_component } from './lifecycle';
-import { blank_object, is_function, run, run_all, noop } from './utils';
+import { blank_object, is_function, run, run_all, noop, has_prop } from './utils';
 import { children } from './dom';
 import { transition_in } from './transitions';
 
@@ -22,7 +22,7 @@ interface T$$ {
 }
 
 export function bind(component, name, callback) {
-	if (component.$$.props.hasOwnProperty(name)) {
+	if (has_prop(component.$$.props, name)) {
 		name = component.$$.props[name] || name;
 		component.$$.bound[name] = callback;
 		callback(component.$$.ctx[name]);

src/runtime/internal/dom.ts

@@ -1,3 +1,5 @@
+import { has_prop } from "./utils";
+
 export function append(target: Node, node: Node) {
 	target.appendChild(node);
 }
@@ -29,7 +31,7 @@ export function object_without_properties<T, K extends keyof T>(obj: T, exclude:
 	const target = {} as Pick<T, Exclude<keyof T, K>>;
 	for (const k in obj) {
 		if (
-			Object.prototype.hasOwnProperty.call(obj, k)
+			has_prop(obj, k)
 			// @ts-ignore
 			&& exclude.indexOf(k) === -1
 		) {

src/runtime/internal/utils.ts

@@ -105,3 +105,5 @@ export function set_store_value(store, ret, value = ret) {
 	store.set(value);
 	return ret;
 }
+
+export const has_prop = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop);