fix: lazily create metadata (#74)

superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/createMetadata.ts

@@ -0,0 +1,12 @@
+import { t } from '@superset-ui/translation';
+import { ChartMetadata } from '@superset-ui/chart';
+import thumbnail from './images/thumbnail.png';
+
+export default function createMetadata(useLegacyApi = false) {
+  return new ChartMetadata({
+    description: '',
+    name: t('Line Chart'),
+    thumbnail,
+    useLegacyApi,
+  });
+}

superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/index.ts

@@ -1,6 +1,6 @@
 import { ChartPlugin } from '@superset-ui/chart';
-import metadata from './metadata';
 import transformProps from './transformProps';
+import createMetadata from './createMetadata';
 import buildQuery from './buildQuery';
 import ChartFormData from './ChartFormData';
 
@@ -9,7 +9,7 @@ export default class LineChartPlugin extends ChartPlugin<ChartFormData> {
     super({
       buildQuery,
       loadChart: () => import('./Line'),
-      metadata,
+      metadata: createMetadata(),
       transformProps,
     });
   }

superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/legacy/index.ts

@@ -1,12 +1,12 @@
 import { ChartPlugin } from '@superset-ui/chart';
-import metadata from './metadata';
 import transformProps from './transformProps';
+import createMetadata from '../createMetadata';
 
 export default class LineChartPlugin extends ChartPlugin {
   constructor() {
     super({
       loadChart: () => import('../Line'),
-      metadata,
+      metadata: createMetadata(true),
       transformProps,
     });
   }