fix: useEcharts return invalid instance (#5360)

packages/effects/plugins/src/echarts/use-echarts.ts

@@ -2,6 +2,8 @@ import type { EChartsOption } from 'echarts';
 
 import type { Ref } from 'vue';
 
+import type { Nullable } from '@vben/types';
+
 import type EchartsUI from './echarts-ui.vue';
 
 import { computed, nextTick, watch } from 'vue';
@@ -50,7 +52,10 @@ function useEcharts(chartRef: Ref<EchartsUIType>) {
     return chartInstance;
   };
 
-  const renderEcharts = (options: EChartsOption, clear = true) => {
+  const renderEcharts = (
+    options: EChartsOption,
+    clear = true,
+  ): Promise<Nullable<echarts.ECharts>> => {
     cacheOptions = options;
     const currentOptions = {
       ...options,
@@ -58,9 +63,8 @@ function useEcharts(chartRef: Ref<EchartsUIType>) {
     };
     return new Promise((resolve) => {
       if (chartRef.value?.offsetHeight === 0) {
-        useTimeoutFn(() => {
-          renderEcharts(currentOptions);
-          resolve(null);
+        useTimeoutFn(async () => {
+          resolve(await renderEcharts(currentOptions));
         }, 30);
         return;
       }
@@ -72,7 +76,7 @@ function useEcharts(chartRef: Ref<EchartsUIType>) {
           }
           clear && chartInstance?.clear();
           chartInstance?.setOption(currentOptions);
-          resolve(null);
+          resolve(chartInstance);
         }, 30);
       });
     });
@@ -109,7 +113,7 @@ function useEcharts(chartRef: Ref<EchartsUIType>) {
   return {
     renderEcharts,
     resize,
-    chartInstance,
+    getChartInstance: () => chartInstance,
   };
 }