refactor(mediabunny): [PKG-MB-08] checkpoint typed entry and compatible media declarations

packages/artplayer-proxy-mediabunny/src/canvas-bridge.ts

@@ -0,0 +1,36 @@
+import type VideoShim from './VideoShim'
+
+export function bridgeCanvas(canvas: HTMLCanvasElement, shim: VideoShim): void {
+  const methods = new Map<string, (...args: unknown[]) => unknown>()
+  // Dynamic forwarding is intentional: own and direct-prototype members are historical API.
+  const native = canvas as unknown as Record<string, unknown>
+  const members = shim as unknown as Record<string, unknown>
+  for (const name in canvas) {
+    if (typeof native[name] === 'function') {
+      // Preserve the historical second read, including accessor side effects and binding errors.
+      const method = native[name] as (...args: unknown[]) => unknown
+      methods.set(name, method.bind(canvas))
+    }
+  }
+  const names = new Set([
+    ...Object.getOwnPropertyNames(shim),
+    ...Object.getOwnPropertyNames(Object.getPrototypeOf(shim)),
+  ])
+  for (const name of names) {
+    if (name === 'constructor' || name in canvas)
+      continue
+    Object.defineProperty(canvas, name, {
+      get() {
+        const value = members[name]
+        return typeof value === 'function' ? value.bind(shim) : value
+      },
+      set(value: unknown) {
+        members[name] = value
+      },
+      configurable: true,
+      enumerable: true,
+    })
+  }
+  for (const [name, method] of methods)
+    native[name] = (...args: unknown[]) => method(...args)
+}