fix: call vue-component inside install function

src/components/index.js

@@ -0,0 +1,34 @@
+import GridItem from './GridItem.vue';
+import GridLayout from './GridLayout.vue';
+// import ResponsiveGridLayout from './ResponsiveGridLayout.vue';
+
+const VueGridLayout = {
+  // ResponsiveGridLayout,
+  GridLayout,
+  GridItem,
+};
+
+export function install(Vue) {
+  if (install.installed) return;
+  install.installed = true;
+  Object.keys(VueGridLayout).forEach((name) => {
+    Vue.component(name, VueGridLayout[name]);
+  });
+}
+
+const plugin = {
+  install,
+};
+
+let GlobalVue = null;
+if (typeof window !== 'undefined') {
+  GlobalVue = window.Vue;
+} else if (typeof global !== 'undefined') {
+  GlobalVue = global.Vue;
+}
+if (GlobalVue) {
+  GlobalVue.use(plugin);
+}
+
+export default VueGridLayout;
+export { GridLayout, GridItem };