Chore: Fix typescript strict null errors from 674 -> 565 (#26057)

* Chore: Fix typescript strict null errors

* Added new limit

* Fixed ts issue

* fixed tests

* trying to fix type inference

* Fixing more ts errors

* Revert tsconfig option

* Fix

* Fixed code

* More fixes

* fix tests

* Updated snapshot

packages/grafana-data/src/types/datasource.ts

@@ -15,20 +15,10 @@ export interface DataSourcePluginOptionsEditorProps<JSONData = DataSourceJsonDat
 }
 
 // Utility type to extract the query type TQuery from a class extending DataSourceApi<TQuery, TOptions>
-export type DataSourceQueryType<DSType extends DataSourceApi<any, any>> = DSType extends DataSourceApi<
-  infer TQuery,
-  infer _TOptions
->
-  ? TQuery
-  : never;
+export type DataSourceQueryType<DSType> = DSType extends DataSourceApi<infer TQuery, any> ? TQuery : never;
 
 // Utility type to extract the options type TOptions from a class extending DataSourceApi<TQuery, TOptions>
-export type DataSourceOptionsType<DSType extends DataSourceApi<any, any>> = DSType extends DataSourceApi<
-  infer _TQuery,
-  infer TOptions
->
-  ? TOptions
-  : never;
+export type DataSourceOptionsType<DSType> = DSType extends DataSourceApi<any, infer TOptions> ? TOptions : never;
 
 export class DataSourcePlugin<
   DSType extends DataSourceApi<TQuery, TOptions>,
@@ -453,7 +443,6 @@ export interface DataQueryTimings {
 }
 
 export interface QueryFix {
-  type: string;
   label: string;
   action?: QueryFixAction;
 }
@@ -472,6 +461,7 @@ export interface QueryHint {
 
 export interface MetricFindValue {
   text: string;
+  expandable?: boolean;
 }
 
 export interface DataSourceJsonData {

public/app/core/utils/kbn.ts

@@ -230,7 +230,7 @@ kbn.interval_to_ms = (str: string) => {
   return info.sec * 1000 * info.count;
 };
 
-kbn.interval_to_seconds = (str: string) => {
+kbn.interval_to_seconds = (str: string): number => {
   const info = kbn.describe_interval(str);
   return info.sec * info.count;
 };

public/app/features/dashboard/state/PanelQueryRunner.ts

@@ -58,7 +58,7 @@ export interface GetDataOptions {
 }
 
 export class PanelQueryRunner {
-  private subject?: ReplaySubject<PanelData>;
+  private subject: ReplaySubject<PanelData>;
   private subscription?: Unsubscribable;
   private lastResult?: PanelData;
   private dataConfigSource: DataConfigSource;
@@ -244,7 +244,7 @@ export class PanelQueryRunner {
     }
   }
 
-  getLastResult(): PanelData {
+  getLastResult(): PanelData | undefined {
     return this.lastResult;
   }
 }

public/app/features/templating/template_srv.ts

@@ -265,9 +265,9 @@ export class TemplateSrv implements BaseTemplateSrv {
     return variableName;
   }
 
-  variableExists(expression: string) {
+  variableExists(expression: string): boolean {
     const name = this.getVariableName(expression);
-    return name && this.getVariableAtIndex(name) !== void 0;
+    return (name && this.getVariableAtIndex(name)) !== undefined;
   }
 
   highlightVariablesAsHtml(str: string) {

public/app/plugins/datasource/loki/components/__snapshots__/LokiExploreQueryEditor.test.tsx.snap

@@ -77,6 +77,7 @@ exports[`LokiExploreQueryEditor should render component 1`] = `
           },
           Symbol(length): 0,
         },
+        "logLabelFetchTs": 0,
         "request": [Function],
         "seriesCache": LRUCache {
           Symbol(max): 10,

public/app/plugins/datasource/loki/configuration/DebugSection.tsx

@@ -8,7 +8,7 @@ import { ArrayVector, Field, FieldType, LinkModel } from '@grafana/data';
 import { getFieldLinksForExplore } from '../../../../features/explore/utils/links';
 
 type Props = {
-  derivedFields: DerivedFieldConfig[];
+  derivedFields?: DerivedFieldConfig[];
   className?: string;
 };
 export const DebugSection = (props: Props) => {
@@ -92,7 +92,7 @@ function makeDebugFields(derivedFields: DerivedFieldConfig[], debugText: string)
       try {
         const testMatch = debugText.match(field.matcherRegex);
         const value = testMatch && testMatch[1];
-        let link: LinkModel<Field> = null;
+        let link: LinkModel<Field> | null = null;
 
         if (field.url && value) {
           link = getFieldLinksForExplore(
@@ -116,7 +116,6 @@ function makeDebugFields(derivedFields: DerivedFieldConfig[], debugText: string)
           href: link && link.href,
         } as DebugField;
       } catch (error) {
-        console.error(error);
         return {
           name: field.name,
           error,

public/app/plugins/datasource/loki/configuration/DerivedFields.tsx

@@ -20,6 +20,7 @@ type Props = {
   value?: DerivedFieldConfig[];
   onChange: (value: DerivedFieldConfig[]) => void;
 };
+
 export const DerivedFields = (props: Props) => {
   const { value, onChange } = props;
   const theme = useTheme();

public/app/plugins/datasource/loki/datasource.ts

@@ -370,7 +370,7 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
 
   getTime(date: string | DateTime, roundUp: boolean) {
     if (typeof date === 'string') {
-      date = dateMath.parse(date, roundUp);
+      date = dateMath.parse(date, roundUp)!;
     }
 
     return Math.ceil(date.valueOf() * 1e6);
@@ -517,9 +517,9 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
     return annotations;
   }
 
-  showContextToggle = (row?: LogRowModel) => {
-    return row && row.searchWords && row.searchWords.length > 0;
-  };
+  showContextToggle(row?: LogRowModel): boolean {
+    return (row && row.searchWords && row.searchWords.length > 0) === true;
+  }
 
   throwUnless = (err: any, condition: boolean, target: LokiQuery) => {
     if (condition) {

public/app/plugins/datasource/loki/language_provider.ts

@@ -58,7 +58,7 @@ export function addHistoryMetadata(item: CompletionItem, history: LokiHistoryIte
 export default class LokiLanguageProvider extends LanguageProvider {
   labelKeys: string[];
   logLabelOptions: any[];
-  logLabelFetchTs?: number;
+  logLabelFetchTs: number;
   started: boolean;
   initialRange: AbsoluteTimeRange;
   datasource: LokiDatasource;
@@ -77,6 +77,7 @@ export default class LokiLanguageProvider extends LanguageProvider {
 
     this.datasource = datasource;
     this.labelKeys = [];
+    this.logLabelFetchTs = 0;
 
     Object.assign(this, initialValues);
   }
@@ -127,6 +128,11 @@ export default class LokiLanguageProvider extends LanguageProvider {
    */
   async provideCompletionItems(input: TypeaheadInput, context?: TypeaheadContext): Promise<TypeaheadOutput> {
     const { wrapperClasses, value, prefix, text } = input;
+    const emptyResult: TypeaheadOutput = { suggestions: [] };
+
+    if (!value) {
+      return emptyResult;
+    }
 
     // Local text properties
     const empty = value?.document.text.length === 0;
@@ -169,18 +175,16 @@ export default class LokiLanguageProvider extends LanguageProvider {
       return this.getTermCompletionItems();
     }
 
-    return {
-      suggestions: [],
-    };
+    return emptyResult;
   }
 
-  getBeginningCompletionItems = (context: TypeaheadContext): TypeaheadOutput => {
+  getBeginningCompletionItems = (context?: TypeaheadContext): TypeaheadOutput => {
     return {
       suggestions: [...this.getEmptyCompletionItems(context).suggestions, ...this.getTermCompletionItems().suggestions],
     };
   };
 
-  getEmptyCompletionItems(context: TypeaheadContext): TypeaheadOutput {
+  getEmptyCompletionItems(context?: TypeaheadContext): TypeaheadOutput {
     const history = context?.history;
     const suggestions = [];
 
@@ -386,7 +390,7 @@ export default class LokiLanguageProvider extends LanguageProvider {
   async fetchLogLabels(absoluteRange: AbsoluteTimeRange): Promise<any> {
     const url = '/loki/api/v1/label';
     try {
-      this.logLabelFetchTs = Date.now();
+      this.logLabelFetchTs = Date.now().valueOf();
       const rangeParams = absoluteRange ? rangeToParams(absoluteRange) : {};
       const res = await this.request(url, rangeParams);
       this.labelKeys = res.slice().sort();
@@ -398,7 +402,7 @@ export default class LokiLanguageProvider extends LanguageProvider {
   }
 
   async refreshLogLabels(absoluteRange: AbsoluteTimeRange, forceRefresh?: boolean) {
-    if ((this.labelKeys && Date.now() - this.logLabelFetchTs > LABEL_REFRESH_INTERVAL) || forceRefresh) {
+    if ((this.labelKeys && Date.now().valueOf() - this.logLabelFetchTs > LABEL_REFRESH_INTERVAL) || forceRefresh) {
       await this.fetchLogLabels(absoluteRange);
     }
   }
@@ -409,7 +413,7 @@ export default class LokiLanguageProvider extends LanguageProvider {
    * @param name
    */
   fetchSeriesLabels = async (match: string, absoluteRange: AbsoluteTimeRange): Promise<Record<string, string[]>> => {
-    const rangeParams: { start?: number; end?: number } = absoluteRange ? rangeToParams(absoluteRange) : {};
+    const rangeParams = absoluteRange ? rangeToParams(absoluteRange) : { start: 0, end: 0 };
     const url = '/loki/api/v1/series';
     const { start, end } = rangeParams;
 
@@ -447,7 +451,7 @@ export default class LokiLanguageProvider extends LanguageProvider {
   async fetchLabelValues(key: string, absoluteRange: AbsoluteTimeRange): Promise<string[]> {
     const url = `/loki/api/v1/label/${key}/values`;
     let values: string[] = [];
-    const rangeParams: { start?: number; end?: number } = absoluteRange ? rangeToParams(absoluteRange) : {};
+    const rangeParams = absoluteRange ? rangeToParams(absoluteRange) : { start: 0, end: 0 };
     const { start, end } = rangeParams;
 
     const cacheKey = this.generateCacheKey(url, start, end, key);

public/app/plugins/datasource/loki/query_utils.test.ts

@@ -18,7 +18,7 @@ describe('getHighlighterExpressionsFromQuery', () => {
   });
 
   it('returns null if filter term is not wrapped in double quotes', () => {
-    expect(getHighlighterExpressionsFromQuery('{foo="bar"} |= x')).toEqual(null);
+    expect(getHighlighterExpressionsFromQuery('{foo="bar"} |= x')).toEqual([]);
   });
 
   it('escapes filter term if regex filter operator is not used', () => {

public/app/plugins/datasource/loki/query_utils.ts

 import escapeRegExp from 'lodash/escapeRegExp';
 
-export function formatQuery(selector: string): string {
+export function formatQuery(selector: string | undefined): string {
   return `${selector || ''}`.trim();
 }
 
@@ -11,6 +11,7 @@ export function formatQuery(selector: string): string {
 export function getHighlighterExpressionsFromQuery(input: string): string[] {
   let expression = input;
   const results = [];
+
   // Consume filter expression from left to right
   while (expression) {
     const filterStart = expression.search(/\|=|\|~|!=|!~/);
@@ -43,8 +44,9 @@ export function getHighlighterExpressionsFromQuery(input: string): string[] {
       const regexOperator = filterOperator === '|~';
       results.push(regexOperator ? unwrappedFilterTerm : escapeRegExp(unwrappedFilterTerm));
     } else {
-      return null;
+      return [];
     }
   }
+
   return results;
 }

public/app/plugins/datasource/loki/result_transformer.ts

@@ -15,6 +15,7 @@ import {
   Field,
   QueryResultMetaStat,
   QueryResultMeta,
+  TimeSeriesValue,
 } from '@grafana/data';
 
 import templateSrv from 'app/features/templating/template_srv';
@@ -154,16 +155,14 @@ function lokiMatrixToTimeSeries(matrixResult: LokiMatrixResult, options: Transfo
   };
 }
 
-function lokiPointsToTimeseriesPoints(
-  data: Array<[number, string]>,
-  options: TransformerOptions
-): Array<[number, number]> {
+function lokiPointsToTimeseriesPoints(data: Array<[number, string]>, options: TransformerOptions): TimeSeriesValue[][] {
   const stepMs = options.step * 1000;
-  const datapoints: Array<[number, number]> = [];
+  const datapoints: TimeSeriesValue[][] = [];
 
   let baseTimestampMs = options.start / 1e6;
   for (const [time, value] of data) {
-    let datapointValue = parseFloat(value);
+    let datapointValue: TimeSeriesValue = parseFloat(value);
+
     if (isNaN(datapointValue)) {
       datapointValue = null;
     }
@@ -198,7 +197,7 @@ export function lokiResultsToTableModel(
 
   // Collect all labels across all metrics
   const metricLabels: Set<string> = new Set<string>(
-    lokiResults.reduce((acc, cur) => acc.concat(Object.keys(cur.metric)), [])
+    lokiResults.reduce((acc, cur) => acc.concat(Object.keys(cur.metric)), [] as string[])
   );
 
   // Sort metric labels, create columns for them and record their index
@@ -245,9 +244,9 @@ function createMetricLabel(labelData: { [key: string]: string }, options?: Trans
   let label =
     options === undefined || _.isEmpty(options.legendFormat)
       ? getOriginalMetricName(labelData)
-      : renderTemplate(templateSrv.replace(options.legendFormat), labelData);
+      : renderTemplate(templateSrv.replace(options.legendFormat ?? ''), labelData);
 
-  if (!label) {
+  if (!label && options) {
     label = options.query;
   }
   return label;
@@ -272,11 +271,13 @@ export function decamelize(s: string): string {
 }
 
 // Turn loki stats { metric: value } into meta stat { title: metric, value: value }
-function lokiStatsToMetaStat(stats: LokiStats): QueryResultMetaStat[] {
+function lokiStatsToMetaStat(stats: LokiStats | undefined): QueryResultMetaStat[] {
   const result: QueryResultMetaStat[] = [];
+
   if (!stats) {
     return result;
   }
+
   for (const section in stats) {
     const values = stats[section];
     for (const label in values) {
@@ -293,6 +294,7 @@ function lokiStatsToMetaStat(stats: LokiStats): QueryResultMetaStat[] {
       result.push({ displayName: title, value, unit });
     }
   }
+
   return result;
 }
 
@@ -309,6 +311,7 @@ export function lokiStreamsToDataframes(
   const custom = {
     lokiQueryStatKey: 'Summary: total bytes processed',
   };
+
   const series: DataFrame[] = data.map(stream => {
     const dataFrame = lokiStreamResultToDataFrame(stream, reverse);
     enhanceDataFrame(dataFrame, config);
@@ -406,10 +409,10 @@ export function rangeQueryResponseToTimeSeries(
 
   const transformerOptions: TransformerOptions = {
     format: target.format,
-    legendFormat: target.legendFormat,
-    start: query.start,
-    end: query.end,
-    step: query.step,
+    legendFormat: target.legendFormat ?? '',
+    start: query.start!,
+    end: query.end!,
+    step: query.step!,
     query: query.query,
     responseListLength,
     refId: target.refId,

public/app/plugins/datasource/loki/types.ts

@@ -59,7 +59,7 @@ export interface LokiVectorResponse {
 }
 
 export interface LokiMatrixResult {
-  metric: { [label: string]: string };
+  metric: Record<string, string>;
   values: Array<[number, string]>;
 }
 
@@ -115,8 +115,8 @@ export type DerivedFieldConfig = {
 };
 
 export interface TransformerOptions {
-  format: string;
-  legendFormat: string;
+  format?: string;
+  legendFormat?: string;
   step: number;
   start: number;
   end: number;

public/app/plugins/datasource/mixed/MixedDataSource.ts

@@ -38,14 +38,17 @@ export class MixedDatasource extends DataSourceApi<DataQuery> {
     // Build groups of queries to run in parallel
     const sets: { [key: string]: DataQuery[] } = groupBy(queries, 'datasource');
     const mixed: BatchedQueries[] = [];
+
     for (const key in sets) {
       const targets = sets[key];
-      const dsName: string | undefined = targets[0].datasource;
+      const dsName = targets[0].datasource;
+
       mixed.push({
         datasource: getDataSourceSrv().get(dsName, request.scopedVars),
         targets,
       });
     }
+
     return this.batchQueries(mixed, request);
   }
 

public/app/plugins/datasource/opentsdb/datasource.ts

@@ -39,8 +39,8 @@ export default class OpenTsDatasource extends DataSourceApi<OpenTsdbQuery, OpenT
 
   // Called once per panel (graph)
   query(options: DataQueryRequest<OpenTsdbQuery>) {
-    const start = this.convertToTSDBTime(options.rangeRaw.from, false, options.timezone);
-    const end = this.convertToTSDBTime(options.rangeRaw.to, true, options.timezone);
+    const start = this.convertToTSDBTime(options.range.raw.from, false, options.timezone);
+    const end = this.convertToTSDBTime(options.range.raw.to, true, options.timezone);
     const qs: any[] = [];
 
     _.each(options.targets, target => {

public/app/plugins/datasource/prometheus/components/PromExploreExtraField.tsx

@@ -19,7 +19,7 @@ export function PromExploreExtraField(props: PromExploreExtraFieldProps) {
   return (
     <div className="gf-form-inline" aria-label="Prometheus extra field">
       <div className="gf-form">
-        <InlineFormLabel width={5} tooltip={hasTooltip ? tooltipContent : null}>
+        <InlineFormLabel width={5} tooltip={hasTooltip ? tooltipContent : undefined}>
           {label}
         </InlineFormLabel>
         <input

public/app/plugins/datasource/prometheus/components/PromExploreQueryEditor.tsx

-import React, { memo } from 'react';
+import React, { memo, FC } from 'react';
 
 // Types
 import { ExploreQueryFieldProps } from '@grafana/data';
@@ -11,7 +11,7 @@ import { PromExploreExtraField } from './PromExploreExtraField';
 
 export type Props = ExploreQueryFieldProps<PrometheusDatasource, PromQuery, PromOptions>;
 
-export function PromExploreQueryEditor(props: Props) {
+export const PromExploreQueryEditor: FC<Props> = (props: Props) => {
   const { query, data, datasource, history, onChange, onRunQuery } = props;
 
   function onChangeQueryStep(value: string) {
@@ -55,6 +55,6 @@ export function PromExploreQueryEditor(props: Props) {
       }
     />
   );
-}
+};
 
 export default memo(PromExploreQueryEditor);

public/app/plugins/datasource/prometheus/components/PromLink.tsx

@@ -17,7 +17,8 @@ interface State {
 }
 
 export default class PromLink extends Component<Props, State> {
-  state: State = { href: null };
+  state: State = { href: '' };
+
   async componentDidUpdate(prevProps: Props) {
     const { panelData } = this.props;
 

public/app/plugins/datasource/prometheus/components/PromQueryEditor.tsx

@@ -26,9 +26,9 @@ const INTERVAL_FACTOR_OPTIONS: Array<SelectableValue<number>> = _.map([1, 2, 3,
 }));
 
 interface State {
-  legendFormat: string;
+  legendFormat?: string;
   formatOption: SelectableValue<string>;
-  interval: string;
+  interval?: string;
   intervalFactorOption: SelectableValue<number>;
   instant: boolean;
 }

public/app/plugins/datasource/prometheus/components/PromQueryField.tsx

@@ -184,7 +184,7 @@ class PromQueryField extends React.PureComponent<PromQueryFieldProps, PromQueryF
 
     const result = isDataFrame(data.series[0]) ? data.series.map(toLegacyResponseData) : data.series;
     const hints = datasource.getQueryHints(query, result);
-    const hint = hints && hints.length > 0 ? hints[0] : null;
+    const hint = hints.length > 0 ? hints[0] : null;
     this.setState({ hint });
   };
 
@@ -250,7 +250,7 @@ class PromQueryField extends React.PureComponent<PromQueryFieldProps, PromQueryF
     const { datasource, query, onChange, onRunQuery } = this.props;
     const { hint } = this.state;
 
-    onChange(datasource.modifyQuery(query, hint.fix.action));
+    onChange(datasource.modifyQuery(query, hint!.fix!.action));
     onRunQuery();
   };
 
@@ -277,7 +277,8 @@ class PromQueryField extends React.PureComponent<PromQueryFieldProps, PromQueryF
         : metricsByPrefix;
 
     // Hint for big disabled lookups
-    let hint: QueryHint;
+    let hint: QueryHint | null = null;
+
     if (!datasource.lookupsDisabled && languageProvider.lookupsDisabled) {
       hint = {
         label: `Dynamic label lookup is disabled for datasources with more than ${lookupMetricsThreshold} metrics.`,

public/app/plugins/datasource/prometheus/components/__snapshots__/PromExploreExtraField.test.tsx.snap

@@ -9,7 +9,6 @@ exports[`PrometheusExploreExtraField should render component 1`] = `
     className="gf-form"
   >
     <Component
-      tooltip={null}
       width={5}
     >
       Prometheus Explore Extra Field

public/app/plugins/datasource/prometheus/configuration/PromSettings.tsx

@@ -78,7 +78,7 @@ export const PromSettings = (props: Props) => {
       <div className="gf-form-group">
         <div className="gf-form">
           <Switch
-            checked={options.jsonData.disableMetricsLookup}
+            checked={options.jsonData.disableMetricsLookup ?? false}
             label="Disable metrics lookup"
             labelClass="width-14"
             onChange={onUpdateDatasourceJsonDataOptionChecked(props, 'disableMetricsLookup')}

public/app/plugins/datasource/prometheus/datasource.ts

@@ -26,7 +26,7 @@ import { filter, map, tap } from 'rxjs/operators';
 import PrometheusMetricFindQuery from './metric_find_query';
 import { ResultTransformer } from './result_transformer';
 import PrometheusLanguageProvider from './language_provider';
-import { getBackendSrv } from '@grafana/runtime';
+import { getBackendSrv, BackendSrvRequest } from '@grafana/runtime';
 import addLabelToQuery from './add_label_to_query';
 import { getQueryHints } from './query_hints';
 import { expandRecordingRules } from './language_utils';
@@ -39,17 +39,6 @@ import TableModel from 'app/core/table_model';
 
 export const ANNOTATION_QUERY_STEP_DEFAULT = '60s';
 
-interface RequestOptions {
-  method?: string;
-  url?: string;
-  headers?: Record<string, string>;
-  transformRequest?: (data: any) => string;
-  data?: any;
-  withCredentials?: boolean;
-  silent?: boolean;
-  requestId?: string;
-}
-
 export interface PromDataQueryResponse {
   data: {
     status: string;
@@ -92,7 +81,7 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
 
     this.type = 'prometheus';
     this.editorSrc = 'app/features/prometheus/partials/query.editor.html';
-    this.url = instanceSettings.url;
+    this.url = instanceSettings.url!;
     this.basicAuth = instanceSettings.basicAuth;
     this.withCredentials = instanceSettings.withCredentials;
     this.interval = instanceSettings.jsonData.timeInterval || '15s';
@@ -102,7 +91,7 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
     this.resultTransformer = new ResultTransformer(templateSrv);
     this.ruleMappings = {};
     this.languageProvider = new PrometheusLanguageProvider(this);
-    this.lookupsDisabled = instanceSettings.jsonData.disableMetricsLookup;
+    this.lookupsDisabled = instanceSettings.jsonData.disableMetricsLookup ?? false;
     this.customQueryParameters = new URLSearchParams(instanceSettings.jsonData.customQueryParameters);
   }
 
@@ -123,8 +112,8 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
     }
   }
 
-  _request(url: string, data: Record<string, string> = {}, options?: RequestOptions) {
-    options = defaults(options || {}, {
+  _request(url: string, data: Record<string, string> | null, overrides?: Partial<BackendSrvRequest>) {
+    const options: BackendSrvRequest = defaults(overrides || {}, {
       url: this.url + url,
       method: this.httpMethod,
       headers: {},
@@ -153,7 +142,7 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
       options.headers.Authorization = this.basicAuth;
     }
 
-    return getBackendSrv().datasourceRequest(options as Required<RequestOptions>);
+    return getBackendSrv().datasourceRequest(options);
   }
 
   // Use this for tab completion features, wont publish response to other components
@@ -271,13 +260,10 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
     let runningQueriesCount = queries.length;
     const subQueries = queries.map((query, index) => {
       const target = activeTargets[index];
-      let observable: Observable<any> = null;
 
-      if (query.instant) {
-        observable = from(this.performInstantQuery(query, end));
-      } else {
-        observable = from(this.performTimeSeriesQuery(query, query.start, query.end));
-      }
+      let observable = query.instant
+        ? from(this.performInstantQuery(query, end))
+        : from(this.performTimeSeriesQuery(query, query.start, query.end));
 
       return observable.pipe(
         // Decrease the counter here. We assume that each request returns only single value and then completes
@@ -301,13 +287,10 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
   private panelsQuery(queries: PromQueryRequest[], activeTargets: PromQuery[], end: number, requestId: string) {
     const observables: Array<Observable<Array<TableModel | TimeSeries>>> = queries.map((query, index) => {
       const target = activeTargets[index];
-      let observable: Observable<any> = null;
 
-      if (query.instant) {
-        observable = from(this.performInstantQuery(query, end));
-      } else {
-        observable = from(this.performTimeSeriesQuery(query, query.start, query.end));
-      }
+      let observable = query.instant
+        ? from(this.performInstantQuery(query, end))
+        : from(this.performTimeSeriesQuery(query, query.start, query.end));
 
       return observable.pipe(
         filter((response: any) => (response.cancelled ? false : true)),
@@ -346,10 +329,10 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
     const range = Math.ceil(end - start);
 
     // options.interval is the dynamically calculated interval
-    let interval = kbn.interval_to_seconds(options.interval);
+    let interval: number = kbn.interval_to_seconds(options.interval);
     // Minimum interval ("Min step"), if specified for the query or datasource. or same as interval otherwise
     const minInterval = kbn.interval_to_seconds(
-      templateSrv.replace(target.interval, options.scopedVars) || options.interval
+      templateSrv.replace(target.interval || options.interval, options.scopedVars)
     );
     const intervalFactor = target.intervalFactor || 1;
     // Adjust the interval to take into account any specified minimum and interval factor plus Prometheus limits
@@ -576,7 +559,7 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
       return [];
     }
 
-    const step = Math.floor(query.step) * 1000;
+    const step = Math.floor(query.step ?? 15) * 1000;
 
     response?.data?.data?.result?.forEach(series => {
       const tags = Object.entries(series.metric)
@@ -596,16 +579,17 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
       });
 
       const activeValues = series.values.filter((value: Record<number, string>) => parseFloat(value[1]) >= 1);
-      const activeValuesTimestamps = activeValues.map((value: number[]) => value[0]);
+      const activeValuesTimestamps: number[] = activeValues.map((value: number[]) => value[0]);
 
       // Instead of creating singular annotation for each active event we group events into region if they are less
       // then `step` apart.
-      let latestEvent: AnnotationEvent = null;
-      activeValuesTimestamps.forEach((timestamp: number) => {
+      let latestEvent: AnnotationEvent | null = null;
+
+      for (const timestamp of activeValuesTimestamps) {
         // We already have event `open` and we have new event that is inside the `step` so we just update the end.
-        if (latestEvent && latestEvent.timeEnd + step >= timestamp) {
+        if (latestEvent && (latestEvent.timeEnd ?? 0) + step >= timestamp) {
           latestEvent.timeEnd = timestamp;
-          return;
+          continue;
         }
 
         // Event exists but new one is outside of the `step` so we "finish" the current region.
@@ -622,7 +606,8 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
           tags,
           text: self.resultTransformer.renderTemplate(textFormat, series.metric),
         };
-      });
+      }
+
       if (latestEvent) {
         // finish up last point if we have one
         latestEvent.timeEnd = activeValuesTimestamps[activeValuesTimestamps.length - 1];
@@ -723,7 +708,7 @@ export class PrometheusDatasource extends DataSourceApi<PromQuery, PromOptions>
 
   getPrometheusTime(date: string | DateTime, roundUp: boolean) {
     if (typeof date === 'string') {
-      date = dateMath.parse(date, roundUp);
+      date = dateMath.parse(date, roundUp)!;
     }
 
     return Math.ceil(date.valueOf() / 1000);

public/app/plugins/datasource/prometheus/language_provider.ts

@@ -54,9 +54,9 @@ function addMetricsMetadata(metric: string, metadata?: PromMetricsMetadata): Com
 const PREFIX_DELIMITER_REGEX = /(="|!="|=~"|!~"|\{|\[|\(|\+|-|\/|\*|%|\^|\band\b|\bor\b|\bunless\b|==|>=|!=|<=|>|<|=|~|,)/;
 
 export default class PromQlLanguageProvider extends LanguageProvider {
-  histogramMetrics?: string[];
+  histogramMetrics: string[];
   timeRange?: { start: number; end: number };
-  metrics?: string[];
+  metrics: string[];
   metricsMetadata?: PromMetricsMetadata;
   startTask: Promise<any>;
   datasource: PrometheusDatasource;
@@ -87,7 +87,7 @@ export default class PromQlLanguageProvider extends LanguageProvider {
   // Strip syntax chars so that typeahead suggestions can work on clean inputs
   cleanText(s: string) {
     const parts = s.split(PREFIX_DELIMITER_REGEX);
-    const last = parts.pop();
+    const last = parts.pop()!;
     return last
       .trimLeft()
       .replace(/"$/, '')
@@ -136,6 +136,12 @@ export default class PromQlLanguageProvider extends LanguageProvider {
     { prefix, text, value, labelKey, wrapperClasses }: TypeaheadInput,
     context: { history: Array<HistoryItem<PromQuery>> } = { history: [] }
   ): Promise<TypeaheadOutput> => {
+    const emptyResult: TypeaheadOutput = { suggestions: [] };
+
+    if (!value) {
+      return emptyResult;
+    }
+
     // Local text properties
     const empty = value.document.text.length === 0;
     const selectedLines = value.document.getTextsAtRange(value.selection);
@@ -179,9 +185,7 @@ export default class PromQlLanguageProvider extends LanguageProvider {
       return this.getTermCompletionItems();
     }
 
-    return {
-      suggestions: [],
-    };
+    return emptyResult;
   };
 
   getBeginningCompletionItems = (context: { history: Array<HistoryItem<PromQuery>> }): TypeaheadOutput => {
@@ -253,7 +257,12 @@ export default class PromQlLanguageProvider extends LanguageProvider {
     // Stitch all query lines together to support multi-line queries
     let queryOffset;
     const queryText = value.document.getBlocks().reduce((text: string, block) => {
-      const blockText = block.getText();
+      if (!block) {
+        return text;
+      }
+
+      const blockText = block?.getText();
+
       if (value.anchorBlock.key === block.key) {
         // Newline characters are not accounted for but this is irrelevant
         // for the purpose of extracting the selector string
@@ -305,6 +314,10 @@ export default class PromQlLanguageProvider extends LanguageProvider {
     labelKey,
     value,
   }: TypeaheadInput): Promise<TypeaheadOutput> => {
+    if (!value) {
+      return { suggestions: [] };
+    }
+
     const suggestions: CompletionItemGroup[] = [];
     const line = value.anchorBlock.getText();
     const cursorOffset = value.selection.anchor.offset;
@@ -346,7 +359,8 @@ export default class PromQlLanguageProvider extends LanguageProvider {
       return { suggestions };
     }
 
-    let context: string;
+    let context: string | undefined;
+
     if ((text && isValueStart) || wrapperClasses.includes('attr-value')) {
       // Label values
       if (labelKey && labelValues[labelKey]) {

public/app/plugins/datasource/prometheus/language_utils.ts

@@ -119,19 +119,20 @@ export function expandRecordingRules(query: string, mapping: { [name: string]: s
   // Regex that matches occurences of ){ or }{ or ]{ which is a sign of incorrecly added labels.
   const invalidLabelsRegex = /(\)\{|\}\{|\]\{)/;
   const correctlyExpandedQueryArray = queryArray.map(query => {
-    let expression = query;
-    if (expression.match(invalidLabelsRegex)) {
-      expression = addLabelsToExpression(expression, invalidLabelsRegex);
-    }
-    return expression;
+    return addLabelsToExpression(query, invalidLabelsRegex);
   });
 
   return correctlyExpandedQueryArray.join('');
 }
 
 function addLabelsToExpression(expr: string, invalidLabelsRegexp: RegExp) {
+  const match = expr.match(invalidLabelsRegexp);
+  if (!match) {
+    return expr;
+  }
+
   // Split query into 2 parts - before the invalidLabelsRegex match and after.
-  const indexOfRegexMatch = expr.match(invalidLabelsRegexp).index;
+  const indexOfRegexMatch = match.index ?? 0;
   const exprBeforeRegexMatch = expr.substr(0, indexOfRegexMatch + 1);
   const exprAfterRegexMatch = expr.substr(indexOfRegexMatch + 1);
 

public/app/plugins/datasource/prometheus/metric_find_query.ts

 import _ from 'lodash';
-import { TimeRange } from '@grafana/data';
+import { TimeRange, MetricFindValue } from '@grafana/data';
 import { PrometheusDatasource, PromDataQueryResponse } from './datasource';
 import { PromQueryRequest } from './types';
 import { getTimeSrv } from 'app/features/dashboard/services/TimeSrv';
@@ -13,7 +13,7 @@ export default class PrometheusMetricFindQuery {
     this.range = getTimeSrv().timeRange();
   }
 
-  process() {
+  process(): Promise<MetricFindValue[]> {
     const labelNamesRegex = /^label_names\(\)\s*$/;
     const labelValuesRegex = /^label_values\((?:(.+),\s*)?([a-zA-Z_][a-zA-Z0-9_]*)\)\s*$/;
     const metricNamesRegex = /^metrics\((.+)\)\s*$/;
@@ -28,7 +28,7 @@ export default class PrometheusMetricFindQuery {
       if (labelValuesQuery[1]) {
         return this.labelValuesQuery(labelValuesQuery[2], labelValuesQuery[1]);
       } else {
-        return this.labelValuesQuery(labelValuesQuery[2], null);
+        return this.labelValuesQuery(labelValuesQuery[2]);
       }
     }
 
@@ -136,7 +136,7 @@ export default class PrometheusMetricFindQuery {
     });
   }
 
-  metricNameAndLabelsQuery(query: string) {
+  metricNameAndLabelsQuery(query: string): Promise<MetricFindValue[]> {
     const start = this.datasource.getPrometheusTime(this.range.from, false);
     const end = this.datasource.getPrometheusTime(this.range.to, true);
     const params = new URLSearchParams({
@@ -144,10 +144,11 @@ export default class PrometheusMetricFindQuery {
       start: start.toString(),
       end: end.toString(),
     });
-    const url = `/api/v1/series?${params.toString()}`;
 
+    const url = `/api/v1/series?${params.toString()}`;
     const self = this;
-    return this.datasource.metadataRequest(url).then((result: PromDataQueryResponse) => {
+
+    return this.datasource.metadataRequest(url).then((result: any) => {
       return _.map(result.data.data, (metric: { [key: string]: string }) => {
         return {
           text: self.datasource.getOriginalMetricName(metric),

public/app/plugins/datasource/prometheus/query_hints.test.ts

@@ -3,11 +3,11 @@ import { PrometheusDatasource } from './datasource';
 
 describe('getQueryHints()', () => {
   it('returns no hints for no series', () => {
-    expect(getQueryHints('', [])).toEqual(null);
+    expect(getQueryHints('', [])).toEqual([]);
   });
 
   it('returns no hints for empty series', () => {
-    expect(getQueryHints('', [{ datapoints: [] }])).toEqual(null);
+    expect(getQueryHints('', [{ datapoints: [] }])).toEqual([]);
   });
 
   it('returns a rate hint for a counter metric', () => {
@@ -59,7 +59,7 @@ describe('getQueryHints()', () => {
 
     // Test substring match not triggering hint
     hints = getQueryHints('foo_foo', series, datasource);
-    expect(hints).toBe(null);
+    expect(hints).toEqual([]);
   });
 
   it('returns no rate hint for a counter metric that already has a rate', () => {
@@ -72,7 +72,7 @@ describe('getQueryHints()', () => {
       },
     ];
     const hints = getQueryHints('rate(metric_total[1m])', series);
-    expect(hints).toEqual(null);
+    expect(hints).toEqual([]);
   });
 
   it('returns no rate hint for a counter metric that already has an increase', () => {
@@ -85,7 +85,7 @@ describe('getQueryHints()', () => {
       },
     ];
     const hints = getQueryHints('increase(metric_total[1m])', series);
-    expect(hints).toEqual(null);
+    expect(hints).toEqual([]);
   });
 
   it('returns a rate hint w/o action for a complex counter metric', () => {

public/app/plugins/datasource/prometheus/query_hints.ts

@@ -7,7 +7,7 @@ import { PrometheusDatasource } from './datasource';
  */
 export const SUM_HINT_THRESHOLD_COUNT = 20;
 
-export function getQueryHints(query: string, series?: any[], datasource?: PrometheusDatasource): QueryHint[] | null {
+export function getQueryHints(query: string, series?: any[], datasource?: PrometheusDatasource): QueryHint[] {
   const hints = [];
 
   // ..._bucket metric needs a histogram_quantile()
@@ -32,10 +32,13 @@ export function getQueryHints(query: string, series?: any[], datasource?: Promet
     // Use metric metadata for exact types
     const nameMatch = query.match(/\b(\w+_(total|sum|count))\b/);
     let counterNameMetric = nameMatch ? nameMatch[1] : '';
-    const metricsMetadata = datasource?.languageProvider?.metricsMetadata;
+    const metricsMetadata = datasource?.languageProvider?.metricsMetadata ?? {};
+    const metricMetadataKeys = Object.keys(metricsMetadata);
     let certain = false;
-    if (_.size(metricsMetadata) > 0) {
-      counterNameMetric = Object.keys(metricsMetadata).find(metricName => {
+
+    if (metricMetadataKeys.length > 0) {
+      counterNameMetric =
+        metricMetadataKeys.find(metricName => {
           // Only considering first type information, could be non-deterministic
           const metadata = metricsMetadata[metricName][0];
           if (metadata.type.toLowerCase() === 'counter') {
@@ -46,13 +49,15 @@ export function getQueryHints(query: string, series?: any[], datasource?: Promet
             }
           }
           return false;
-      });
+        }) ?? '';
     }
+
     if (counterNameMetric) {
       const simpleMetric = query.trim().match(/^\w+$/);
       const verb = certain ? 'is' : 'looks like';
       let label = `Metric ${counterNameMetric} ${verb} a counter.`;
-      let fix: QueryFix;
+      let fix: QueryFix | undefined;
+
       if (simpleMetric) {
         fix = {
           label: 'Fix by adding rate().',
@@ -60,10 +65,11 @@ export function getQueryHints(query: string, series?: any[], datasource?: Promet
             type: 'ADD_RATE',
             query,
           },
-        } as QueryFix;
+        };
       } else {
         label = `${label} Try applying a rate() function.`;
       }
+
       hints.push({
         type: 'APPLY_RATE',
         label,
@@ -119,5 +125,5 @@ export function getQueryHints(query: string, series?: any[], datasource?: Promet
     }
   }
 
-  return hints.length > 0 ? hints : null;
+  return hints;
 }

public/app/plugins/datasource/prometheus/result_transformer.ts

@@ -20,7 +20,7 @@ export class ResultTransformer {
         ),
       ];
     } else if (prometheusResult && options.format === 'heatmap') {
-      let seriesList = [];
+      let seriesList: TimeSeries[] = [];
       for (const metricData of prometheusResult) {
         seriesList.push(this.transformMetricData(metricData, options, options.start, options.end));
       }
@@ -28,7 +28,7 @@ export class ResultTransformer {
       seriesList = this.transformToHistogramOverTime(seriesList);
       return seriesList;
     } else if (prometheusResult) {
-      const seriesList = [];
+      const seriesList: TimeSeries[] = [];
       for (const metricData of prometheusResult) {
         if (response.data.data.resultType === 'matrix') {
           seriesList.push(this.transformMetricData(metricData, options, options.start, options.end));
@@ -41,7 +41,7 @@ export class ResultTransformer {
     return [];
   }
 
-  transformMetricData(metricData: any, options: any, start: number, end: number) {
+  transformMetricData(metricData: any, options: any, start: number, end: number): TimeSeries {
     const dps = [];
     const { name, labels, title } = this.createLabelInfo(metricData.metric, options);
 
@@ -53,7 +53,8 @@ export class ResultTransformer {
     }
 
     for (const value of metricData.values) {
-      let dpValue = parseFloat(value[1]);
+      let dpValue: number | null = parseFloat(value[1]);
+
       if (_.isNaN(dpValue)) {
         dpValue = null;
       }
@@ -73,9 +74,8 @@ export class ResultTransformer {
 
     return {
       datapoints: dps,
-      query: options.query,
       refId: options.refId,
-      target: name,
+      target: name ?? '',
       tags: labels,
       title,
       meta: options.meta,
@@ -147,11 +147,11 @@ export class ResultTransformer {
     return table;
   }
 
-  transformInstantMetricData(md: any, options: any) {
+  transformInstantMetricData(md: any, options: any): TimeSeries {
     const dps = [];
     const { name, labels } = this.createLabelInfo(md.metric, options);
     dps.push([parseFloat(md.value[1]), md.value[0] * 1000]);
-    return { target: name, title: name, datapoints: dps, tags: labels, refId: options.refId, meta: options.meta };
+    return { target: name ?? '', title: name, datapoints: dps, tags: labels, refId: options.refId, meta: options.meta };
   }
 
   createLabelInfo(labels: { [key: string]: string }, options: any): { name?: string; labels: Labels; title?: string } {
@@ -210,7 +210,7 @@ export class ResultTransformer {
 
       for (let j = 0; j < topSeries.length; j++) {
         const bottomPoint = bottomSeries[j] || [0];
-        topSeries[j][0] -= bottomPoint[0];
+        topSeries[j][0]! -= bottomPoint[0]!;
       }
     }
 

public/app/plugins/datasource/zipkin/QueryField.tsx

@@ -139,7 +139,7 @@ export function useLoadOptions(datasource: ZipkinDatasource) {
           const newTraces = traces.length
             ? fromPairs(
                 traces.map(trace => {
-                  const rootSpan = trace.find(span => !span.parentId);
+                  const rootSpan = trace.find(span => !span.parentId)!;
 
                   return [`${rootSpan.name} [${Math.floor(rootSpan.duration / 1000)} ms]`, rootSpan.traceId];
                 })
@@ -186,7 +186,8 @@ export function useLoadOptions(datasource: ZipkinDatasource) {
 
 function useMapToCascaderOptions(services: AsyncState<CascaderOption[]>, allOptions: OptionsState) {
   return useMemo(() => {
-    let cascaderOptions: CascaderOption[];
+    let cascaderOptions: CascaderOption[] = [];
+
     if (services.value && services.value.length) {
       cascaderOptions = services.value.map(services => {
         return {

public/app/plugins/datasource/zipkin/datasource.ts

@@ -16,10 +16,9 @@ import { apiPrefix } from './constants';
 import { ZipkinSpan } from './types';
 import { transformResponse } from './utils/transforms';
 
-export type ZipkinQuery = {
-  // At the moment this should be simply the trace ID to get
+export interface ZipkinQuery extends DataQuery {
   query: string;
-} & DataQuery;
+}
 
 export class ZipkinDatasource extends DataSourceApi<ZipkinQuery> {
   constructor(private instanceSettings: DataSourceInstanceSettings) {

public/app/plugins/panel/alertlist/module.ts

@@ -117,8 +117,8 @@ class AlertListPanel extends PanelCtrl {
       params.dashboardId = this.dashboard.id;
     }
 
-    params.from = dateMath.parse(this.dashboard.time.from).unix() * 1000;
-    params.to = dateMath.parse(this.dashboard.time.to).unix() * 1000;
+    params.from = dateMath.parse(this.dashboard.time.from)!.unix() * 1000;
+    params.to = dateMath.parse(this.dashboard.time.to)!.unix() * 1000;
 
     return promiseToDigest(this.$scope)(
       getBackendSrv()

public/app/plugins/panel/graph/GraphMigrations.test.ts

@@ -123,7 +123,7 @@ describe('Graph Panel Migrations', () => {
     expect(result.dataLinks).toBeUndefined();
     expect(fieldSource.defaults.links).toHaveLength(1);
 
-    const link = fieldSource.defaults.links[0];
+    const link = fieldSource.defaults.links![0];
     expect(link.url).toEqual('THE DRILLDOWN URL');
   });
 });

public/app/plugins/panel/graph/graph.ts

@@ -429,7 +429,8 @@ class GraphElement {
 
   // Function for rendering panel
   renderPanel() {
-    this.panelWidth = this.elem.width();
+    this.panelWidth = this.elem.width() ?? 0;
+
     if (this.shouldAbortRender()) {
       return;
     }

public/app/plugins/panel/graph/graph_tooltip.ts

@@ -207,14 +207,18 @@ export default function GraphTooltip(this: any, elem: any, dashboard: any, scope
         self.clear(plot);
         return;
       }
+
       pos.pageX = elem.offset().left + pointOffset.left;
       pos.pageY = elem.offset().top + elem.height() * pos.panelRelY;
-      const isVisible =
-        pos.pageY >= $(window).scrollTop() && pos.pageY <= $(window).innerHeight() + $(window).scrollTop();
+
+      const scrollTop = $(window).scrollTop() ?? 0;
+      const isVisible = pos.pageY >= scrollTop && pos.pageY <= $(window).innerHeight()! + scrollTop;
+
       if (!isVisible) {
         self.clear(plot);
         return;
       }
+
       plot.setCrosshair(pos);
       allSeriesMode = true;
 

public/app/plugins/panel/graph/jquery.flot.events.ts

@@ -470,8 +470,8 @@ export class EventMarkers {
       },
       left,
       top,
-      line.width(),
-      line.height()
+      line.width() ?? 1,
+      line.height() ?? 1
     );
 
     return drawableEvent;
@@ -604,8 +604,8 @@ export class EventMarkers {
       },
       left,
       top,
-      region.width(),
-      region.height()
+      region.width() ?? 1,
+      region.height() ?? 1
     );
 
     return drawableEvent;

public/app/plugins/panel/heatmap/color_legend.ts

@@ -33,7 +33,7 @@ coreModule.directive('colorLegend', () => {
 
       function render() {
         const legendElem = $(elem).find('svg');
-        const legendWidth = Math.floor(legendElem.outerWidth());
+        const legendWidth = Math.floor(legendElem.outerWidth() ?? 10);
 
         if (panel.color.mode === 'spectrum') {
           const colorScheme: any = _.find(ctrl.colorSchemes, {
@@ -102,7 +102,7 @@ function drawColorLegend(
   const legend = d3.select(legendElem.get(0));
   clearLegend(elem);
 
-  const legendWidth = Math.floor(legendElem.outerWidth()) - 30;
+  const legendWidth = Math.floor(legendElem.outerWidth() ?? 10) - 30;
   const legendHeight = legendElem.attr('height');
 
   const rangeStep = ((rangeTo - rangeFrom) / legendWidth) * LEGEND_SEGMENT_WIDTH;
@@ -140,7 +140,7 @@ function drawOpacityLegend(
   const legend = d3.select(legendElem.get(0));
   clearLegend(elem);
 
-  const legendWidth = Math.floor(legendElem.outerWidth()) - 30;
+  const legendWidth = Math.floor(legendElem.outerWidth() ?? 30) - 30;
   const legendHeight = legendElem.attr('height');
 
   const rangeStep = ((rangeTo - rangeFrom) / legendWidth) * LEGEND_SEGMENT_WIDTH;
@@ -214,7 +214,7 @@ function drawSimpleColorLegend(elem: JQuery, colorScale: any) {
   const legendElem = $(elem).find('svg');
   clearLegend(elem);
 
-  const legendWidth = Math.floor(legendElem.outerWidth());
+  const legendWidth = Math.floor(legendElem.outerWidth() ?? 30);
   const legendHeight = legendElem.attr('height');
 
   if (legendWidth) {
@@ -242,7 +242,7 @@ function drawSimpleOpacityLegend(elem: JQuery, options: { colorScale: string; ex
   clearLegend(elem);
 
   const legend = d3.select(legendElem.get(0));
-  const legendWidth = Math.floor(legendElem.outerWidth());
+  const legendWidth = Math.floor(legendElem.outerWidth() ?? 30);
   const legendHeight = legendElem.attr('height');
 
   if (legendWidth) {

public/app/plugins/panel/table-old/renderer.ts

@@ -19,7 +19,7 @@ import { ColumnRender, TableRenderModel, ColumnStyle } from './types';
 import { ColumnOptionsCtrl } from './column_options';
 
 export class TableRenderer {
-  formatters: any[];
+  formatters: any[] = [];
   colorState: any;
 
   constructor(

scripts/ci-frontend-metrics.sh

@@ -2,7 +2,7 @@
 
 echo -e "Collecting code stats (typescript errors & more)"
 
-ERROR_COUNT_LIMIT=700
+ERROR_COUNT_LIMIT=600
 DIRECTIVES_LIMIT=172
 CONTROLLERS_LIMIT=139