refactor(core): CORE-18 type builtins and own prompt lifetimes

packages/artplayer/src/loading.ts

@@ -0,0 +1,19 @@
+import type { ComponentHost } from './component/types'
+import { appendElement } from './component/dom'
+import { isClosing } from './lifecycle/instance'
+import Component from './utils/component'
+
+export interface LoadingHost extends ComponentHost {
+  template: { $player: HTMLElement, $loading: HTMLElement }
+  icons: { loading: string | Element }
+}
+
+export default class Loading extends Component<LoadingHost> {
+  constructor(art: LoadingHost) {
+    super(art)
+    this.name = 'loading'
+    const icon = art.icons.loading
+    if (!isClosing(art))
+      appendElement(art.template.$loading, icon)
+  }
+}