Alerting: adds missing type info to the `FieldConfigSource` (#43619)

public/app/features/alerting/unified/components/rule-editor/VizWrapper.tsx

@@ -4,6 +4,7 @@ import { css } from '@emotion/css';
 import { FieldConfigSource, GrafanaTheme2, PanelData, ThresholdsConfig } from '@grafana/data';
 import { PanelRenderer } from '@grafana/runtime';
 import { PanelContext, PanelContextProvider, useStyles2 } from '@grafana/ui';
+import { GraphFieldConfig, GraphTresholdsStyleMode } from '@grafana/schema';
 import { PanelOptions } from 'app/plugins/panel/table/models.gen';
 import { useVizHeight } from '../../hooks/useVizHeight';
 import { SupportedPanelPlugins, PanelPluginsButtonGroup } from '../PanelPluginsButtonGroup';
@@ -17,6 +18,8 @@ interface Props {
   onThresholdsChange: (thresholds: ThresholdsConfig) => void;
 }
 
+type PanelFieldConfig = FieldConfigSource<GraphFieldConfig>;
+
 export const VizWrapper: FC<Props> = ({ data, currentPanel, changePanel, onThresholdsChange, thresholds }) => {
   const [options, setOptions] = useState<PanelOptions>({
     frameIndex: 0,
@@ -25,7 +28,7 @@ export const VizWrapper: FC<Props> = ({ data, currentPanel, changePanel, onThres
   const vizHeight = useVizHeight(data, currentPanel, options.frameIndex);
   const styles = useStyles2(getStyles(vizHeight));
 
-  const [fieldConfig, setFieldConfig] = useState<FieldConfigSource>(defaultFieldConfig(thresholds, data));
+  const [fieldConfig, setFieldConfig] = useState<PanelFieldConfig>(defaultFieldConfig(thresholds, data));
 
   useEffect(() => {
     setFieldConfig((fieldConfig) => ({
@@ -37,7 +40,7 @@ export const VizWrapper: FC<Props> = ({ data, currentPanel, changePanel, onThres
         custom: {
           ...fieldConfig.defaults.custom,
           thresholdsStyle: {
-            mode: 'line',
+            mode: GraphTresholdsStyleMode.Line,
           },
         },
       },
@@ -104,7 +107,7 @@ function defaultUnit(data: PanelData): string | undefined {
   return data.series[0]?.fields.find((field) => field.type === 'number')?.config.unit;
 }
 
-function defaultFieldConfig(thresholds: ThresholdsConfig, data: PanelData): FieldConfigSource {
+function defaultFieldConfig(thresholds: ThresholdsConfig, data: PanelData): PanelFieldConfig {
   if (!thresholds) {
     return { defaults: {}, overrides: [] };
   }
@@ -115,7 +118,7 @@ function defaultFieldConfig(thresholds: ThresholdsConfig, data: PanelData): Fiel
       unit: defaultUnit(data),
       custom: {
         thresholdsStyle: {
-          mode: 'line',
+          mode: GraphTresholdsStyleMode.Line,
         },
       },
     },