fix(mp-qq): 修复 createCanvasContext 传入 this 报错问题 (question/154223)

packages/uni-mp-qq/src/api/shims.ts

@@ -6,3 +6,27 @@ export const getProvider = initGetProvider({
   payment: ['qqpay'],
   push: ['qq'],
 })
+
+export function createCanvasContext(
+  canvasId: string,
+  context?:
+    | WechatMiniprogram.Component.TrivialInstance
+    | WechatMiniprogram.Page.TrivialInstance
+) {
+  if (context) {
+    context[Symbol.toPrimitive as any] = () => '[object Object]'
+  }
+  return qq.createCanvasContext(canvasId, context)
+}
+
+export function canvasToTempFilePath(
+  canvasId: string,
+  context?:
+    | WechatMiniprogram.Component.TrivialInstance
+    | WechatMiniprogram.Page.TrivialInstance
+) {
+  if (context) {
+    context[Symbol.toPrimitive as any] = () => '[object Object]'
+  }
+  return qq.canvasToTempFilePath(canvasId, context)
+}
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