From 42a7af0c9ddd3c0114fff5edb918bb33d57a52fc Mon Sep 17 00:00:00 2001
From: Robert Monfera <monfera@users.noreply.github.com>
Date: Mon, 25 Jan 2021 16:35:19 +0100
Subject: [PATCH] fix: chart state and series functions cleanup (#989)

---
 .../osd-charts/.playground/playground.tsx     |  21 +--
 ...ogeneous-visually-looks-correct-1-snap.png | Bin 0 -> 24651 bytes
 .../src/chart_types/xy_chart/utils/series.ts  | 118 ++++---------
 packages/osd-charts/src/state/chart_state.ts  | 120 ++++---------
 packages/osd-charts/src/utils/common.ts       |   8 +-
 .../6_heterogeneous_cartesians.tsx            | 164 ++++++++++++++++++
 .../small_multiples.stories.tsx               |   1 +
 .../stories/treemap/10_three_layers.tsx       |   3 +-
 8 files changed, 241 insertions(+), 194 deletions(-)
 create mode 100644 packages/osd-charts/integration/tests/__image_snapshots__/all-test-ts-baseline-visual-tests-for-all-stories-small-multiples-alpha-heterogeneous-visually-looks-correct-1-snap.png
 create mode 100644 packages/osd-charts/stories/small_multiples/6_heterogeneous_cartesians.tsx

diff --git a/packages/osd-charts/.playground/playground.tsx b/packages/osd-charts/.playground/playground.tsx
index 3c9f2ee24038..0d74cc58c2b7 100644
--- a/packages/osd-charts/.playground/playground.tsx
+++ b/packages/osd-charts/.playground/playground.tsx
@@ -17,28 +17,9 @@
  * under the License.
  */
 
-/*
- * Licensed to Elasticsearch B.V. under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch B.V. licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
 import React from 'react';
 
-import { Example } from '../stories/icicle/01_unix_icicle';
+import { Example } from '../stories/small_multiples/6_heterogeneous_cartesians';
 
 export class Playground extends React.Component {
   render() {
diff --git a/packages/osd-charts/integration/tests/__image_snapshots__/all-test-ts-baseline-visual-tests-for-all-stories-small-multiples-alpha-heterogeneous-visually-looks-correct-1-snap.png b/packages/osd-charts/integration/tests/__image_snapshots__/all-test-ts-baseline-visual-tests-for-all-stories-small-multiples-alpha-heterogeneous-visually-looks-correct-1-snap.png
new file mode 100644
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HcmV?d00001

diff --git a/packages/osd-charts/src/chart_types/xy_chart/utils/series.ts b/packages/osd-charts/src/chart_types/xy_chart/utils/series.ts
index f903f38727f6..45433faa1a0e 100644
--- a/packages/osd-charts/src/chart_types/xy_chart/utils/series.ts
+++ b/packages/osd-charts/src/chart_types/xy_chart/utils/series.ts
@@ -19,11 +19,11 @@
 
 import { SeriesIdentifier, SeriesKey } from '../../../common/series_id';
 import { ScaleType } from '../../../scales/constants';
-import { GroupBySpec, BinAgg, Direction, XScaleType } from '../../../specs';
+import { BinAgg, Direction, GroupBySpec, XScaleType } from '../../../specs';
 import { OrderBy } from '../../../specs/settings';
 import { ColorOverrides } from '../../../state/chart_state';
 import { Accessor, AccessorFn, getAccessorValue } from '../../../utils/accessor';
-import { Datum, Color, isNil } from '../../../utils/common';
+import { Color, Datum, isNil } from '../../../utils/common';
 import { GroupId } from '../../../utils/ids';
 import { Logger } from '../../../utils/logger';
 import { ColorConfig } from '../../../utils/themes/theme';
@@ -31,8 +31,8 @@ import { groupSeriesByYGroup, isHistogramEnabled, isStackedSpec } from '../domai
 import { LastValues } from '../state/utils/types';
 import { applyFitFunctionToDataSeries } from './fit_function_utils';
 import { groupBy } from './group_data_series';
-import { BasicSeriesSpec, SeriesTypes, SeriesSpecs, SeriesNameConfigOptions, StackMode } from './specs';
-import { formatStackedDataSeriesValues, datumXSortPredicate } from './stacked_series_utils';
+import { BasicSeriesSpec, SeriesNameConfigOptions, SeriesSpecs, SeriesTypes, StackMode } from './specs';
+import { datumXSortPredicate, formatStackedDataSeriesValues } from './stacked_series_utils';
 
 /** @internal */
 export const SERIES_DELIMITER = ' - ';
@@ -115,9 +115,6 @@ export function getSeriesIndex(series: SeriesIdentifier[], target: SeriesIdentif
 
 /**
  * Returns string form of accessor. Uses index when accessor is a function.
- *
- * @param accessor
- * @param index
  * @internal
  */
 export function getAccessorFieldName(accessor: Accessor | AccessorFn, index: number) {
@@ -126,7 +123,7 @@ export function getAccessorFieldName(accessor: Accessor | AccessorFn, index: num
 
 /**
  * Split a dataset into multiple series depending on the accessors.
- * Each series is then associated with a key thats belong to its configuration.
+ * Each series is then associated with a key that belongs to its configuration.
  * This method removes every data with an invalid x: a string or number value is required
  * `y` values and `mark` values are casted to number or null.
  * @internal
@@ -329,12 +326,7 @@ function castToNumber(value: any, nonNumericValues: any[]): number | null {
   return num;
 }
 
-/**
- * Sorts data based on order of xValues
- * @param dataSeries
- * @param xValues
- * @param xScaleType
- */
+/** Sorts data based on order of xValues */
 const getSortedDataSeries = (
   dataSeries: DataSeries[],
   xValues: Set<string | number>,
@@ -380,14 +372,7 @@ export function getFormattedDataSeries(
   return [...fittedAndStackedDataSeries, ...nonStackedDataSeries];
 }
 
-/**
- *
- * @param seriesSpecs the map for all the series spec
- * @param deselectedDataSeries the array of deselected/hidden data series
- * @param enableVislibSeriesSort is optional; if not specified in <Settings />,
- * @param smallMultiples
- * @internal
- */
+/** @internal */
 export function getDataSeriesFromSpecs(
   seriesSpecs: BasicSeriesSpec[],
   deselectedDataSeries: SeriesIdentifier[] = [],
@@ -518,6 +503,8 @@ function getSortedOrdinalXValues(
   }
 }
 
+const BIG_NUMBER = Number.MAX_SAFE_INTEGER; // the sort comparator must yield finite results, can't use infinities
+
 function getSeriesNameFromOptions(
   options: SeriesNameConfigOptions,
   { yAccessor, splitAccessors }: XYChartSeriesIdentifier,
@@ -530,7 +517,7 @@ function getSeriesNameFromOptions(
   return (
     options.names
       .slice()
-      .sort(({ sortIndex: a = Infinity }, { sortIndex: b = Infinity }) => a - b)
+      .sort(({ sortIndex: a = BIG_NUMBER }, { sortIndex: b = BIG_NUMBER }) => a - b)
       .map(({ accessor, value, name }) => {
         const accessorValue = splitAccessors.get(accessor) ?? null;
         if (accessorValue === value) {
@@ -557,41 +544,28 @@ export function getSeriesName(
   isTooltip: boolean,
   spec?: BasicSeriesSpec,
 ): string {
-  let delimiter = SERIES_DELIMITER;
-  if (spec && spec.name && typeof spec.name !== 'string') {
-    let customLabel: string | number | null = null;
-    if (typeof spec.name === 'function') {
-      customLabel = spec.name(seriesIdentifier, isTooltip);
-    } else {
-      delimiter = spec.name.delimiter ?? delimiter;
-      customLabel = getSeriesNameFromOptions(spec.name, seriesIdentifier, delimiter);
-    }
-
-    if (customLabel !== null) {
-      return customLabel.toString();
-    }
+  const customLabel =
+    typeof spec?.name === 'function'
+      ? spec.name(seriesIdentifier, isTooltip)
+      : typeof spec?.name === 'object' // extract booleans once https://github.com/microsoft/TypeScript/issues/12184 is fixed
+      ? getSeriesNameFromOptions(spec.name, seriesIdentifier, spec.name.delimiter ?? SERIES_DELIMITER)
+      : null;
+
+  if (customLabel !== null) {
+    return customLabel.toString();
   }
 
-  let name = '';
-  const nameKeys =
-    spec && spec.yAccessors.length > 1 ? seriesIdentifier.seriesKeys : seriesIdentifier.seriesKeys.slice(0, -1);
-
-  // there is one series, the is only one yAccessor, the first part is not null
-  if (hasSingleSeries || nameKeys.length === 0 || nameKeys[0] == null) {
-    if (!spec) {
-      return '';
-    }
-
-    if (spec.splitSeriesAccessors && nameKeys.length > 0 && nameKeys[0] != null) {
-      name = nameKeys.join(delimiter);
-    } else {
-      name = typeof spec.name === 'string' ? spec.name : `${spec.id}`;
-    }
-  } else {
-    name = nameKeys.join(delimiter);
-  }
-
-  return name;
+  const multipleYAccessors = spec && spec.yAccessors.length > 1;
+  const nameKeys = multipleYAccessors ? seriesIdentifier.seriesKeys : seriesIdentifier.seriesKeys.slice(0, -1);
+  const nonZeroLength = nameKeys.length > 0;
+
+  return nonZeroLength && (spec?.splitSeriesAccessors || !hasSingleSeries)
+    ? nameKeys.join(typeof spec?.name === 'object' ? spec.name.delimiter ?? SERIES_DELIMITER : SERIES_DELIMITER)
+    : spec === undefined
+    ? ''
+    : typeof spec.name === 'string'
+    ? spec.name
+    : spec.id;
 }
 
 function getSortIndex({ specSortIndex }: SeriesCollectionValue, total: number): number {
@@ -612,12 +586,7 @@ export function getSortedDataSeriesColorsValuesMap(
 
 /**
  * Helper function to get highest override color.
- *
- * from highest to lowest: `temporary`, `seriesSpec.color` then `persisted`
- *
- * @param key
- * @param customColors
- * @param overrides
+ * From highest to lowest: `temporary`, `seriesSpec.color` then, unless `temporary` is set to `null`, `persisted`
  */
 function getHighestOverride(
   key: string,
@@ -625,32 +594,13 @@ function getHighestOverride(
   overrides: ColorOverrides,
 ): Color | undefined {
   const tempColor: Color | undefined | null = overrides.temporary[key];
-
-  if (tempColor) {
-    return tempColor;
-  }
-
-  const customColor: Color | undefined | null = customColors.get(key);
-
-  if (customColor) {
-    return customColor;
-  }
-
-  if (tempColor === null) {
-    // Use default color when temporary and custom colors are null
-    return;
-  }
-
-  return overrides.persisted[key];
+  // Unexpected empty `tempColor` string is falsy and falls through, see comment in `export type Color = ...`
+  // Use default color when temporary and custom colors are null
+  return tempColor || customColors.get(key) || (tempColor === null ? undefined : overrides.persisted[key]);
 }
 
 /**
  * Returns color for a series given all color hierarchies
- *
- * @param seriesCollection
- * @param chartColors
- * @param customColors
- * @param overrides
  * @internal
  */
 export function getSeriesColors(
diff --git a/packages/osd-charts/src/state/chart_state.ts b/packages/osd-charts/src/state/chart_state.ts
index 76b70c4ead75..58bfd765467b 100644
--- a/packages/osd-charts/src/state/chart_state.ts
+++ b/packages/osd-charts/src/state/chart_state.ts
@@ -26,10 +26,10 @@ import { PrimitiveValue } from '../chart_types/partition_chart/layout/utils/grou
 import { PartitionState } from '../chart_types/partition_chart/state/chart_state';
 import { XYAxisChartState } from '../chart_types/xy_chart/state/chart_state';
 import { LegendItem, LegendItemExtraValues } from '../common/legend';
-import { SeriesKey, SeriesIdentifier } from '../common/series_id';
-import { TooltipInfo, TooltipAnchorPosition } from '../components/tooltip/types';
-import { Spec, PointerEvent, DEFAULT_SETTINGS_SPEC } from '../specs';
-import { Color } from '../utils/common';
+import { SeriesIdentifier, SeriesKey } from '../common/series_id';
+import { TooltipAnchorPosition, TooltipInfo } from '../components/tooltip/types';
+import { DEFAULT_SETTINGS_SPEC, PointerEvent, Spec } from '../specs';
+import { Color, keepDistinct } from '../utils/common';
 import { Dimensions } from '../utils/dimensions';
 import { Logger } from '../utils/logger';
 import { Point } from '../utils/point';
@@ -193,7 +193,7 @@ export interface ExternalEventsState {
 
 /** @internal */
 export interface ColorOverrides {
-  temporary: Record<SeriesKey, Color | null>;
+  temporary: Record<SeriesKey, Color | null>; // null (vs. undefined) means that `overrides.persisted[key]` in `series.ts` not be used
   persisted: Record<SeriesKey, Color>;
 }
 
@@ -295,25 +295,14 @@ export const chartStoreReducer = (chartId: string) => {
           zIndex: action.zIndex,
         };
       case SPEC_PARSED:
-        const chartType = findMainChartType(state.specs);
-
-        if (isChartTypeChanged(state, chartType)) {
-          const internalChartState = initInternalChartState(chartType);
-          return {
-            ...state,
-            specsInitialized: true,
-            specParsing: false,
-            chartType,
-            internalChartState,
-          };
-        }
+        const chartType = chartTypeFromSpecs(state.specs);
         return {
           ...state,
           specsInitialized: true,
           specParsing: false,
           chartType,
+          internalChartState: state.chartType === chartType ? state.internalChartState : newInternalState(chartType),
         };
-
       case SPEC_UNMOUNTED:
         return {
           ...state,
@@ -321,26 +310,14 @@ export const chartStoreReducer = (chartId: string) => {
           chartRendered: false,
         };
       case UPSERT_SPEC:
-        if (!state.specParsing) {
-          return {
-            ...state,
-            specsInitialized: false,
-            chartRendered: false,
-            specParsing: true,
-            specs: {
-              [DEFAULT_SETTINGS_SPEC.id]: DEFAULT_SETTINGS_SPEC,
-              [action.spec.id]: action.spec,
-            },
-          };
-        }
         return {
           ...state,
           specsInitialized: false,
           chartRendered: false,
-          specs: {
-            ...state.specs,
-            [action.spec.id]: action.spec,
-          },
+          specParsing: true,
+          specs: state.specParsing
+            ? { ...state.specs, [action.spec.id]: action.spec }
+            : { [DEFAULT_SETTINGS_SPEC.id]: DEFAULT_SETTINGS_SPEC, [action.spec.id]: action.spec },
         };
       case REMOVE_SPEC:
         const { [action.id]: specToRemove, ...rest } = state.specs;
@@ -369,22 +346,11 @@ export const chartStoreReducer = (chartId: string) => {
         };
       case EXTERNAL_POINTER_EVENT:
         // discard events from self if any
-        if (action.event.chartId === chartId) {
-          return {
-            ...state,
-            externalEvents: {
-              ...state.externalEvents,
-              pointer: null,
-            },
-          };
-        }
         return {
           ...state,
           externalEvents: {
             ...state.externalEvents,
-            pointer: {
-              ...action.event,
-            },
+            pointer: action.event.chartId === chartId ? null : action.event,
           },
         };
       case CLEAR_TEMPORARY_COLORS:
@@ -407,59 +373,41 @@ export const chartStoreReducer = (chartId: string) => {
           },
         };
       case SET_PERSISTED_COLOR:
+        const { [action.key]: removedPersistedColor, ...otherPersistentColors } = state.colors.persisted;
         return {
           ...state,
           colors: {
             ...state.colors,
-            persisted:
-              action.color !== null
-                ? {
-                    ...state.colors.persisted,
-                    [action.key]: action.color,
-                  }
-                : (() => {
-                    const { [action.key]: removed, ...others } = state.colors.persisted;
-                    return others;
-                  })(),
+            persisted: {
+              ...otherPersistentColors,
+              ...(action.color && { [action.key]: action.color }),
+            },
           },
         };
       default:
-        if (getInternalIsInitializedSelector(state) !== InitStatus.Initialized) {
-          return state;
-        }
-        return {
-          ...state,
-          interactions: interactionsReducer(state.interactions, action, getLegendItemsSelector(state)),
-        };
+        return getInternalIsInitializedSelector(state) === InitStatus.Initialized
+          ? {
+              ...state,
+              interactions: interactionsReducer(state.interactions, action, getLegendItemsSelector(state)),
+            }
+          : state;
     }
   };
 };
 
-function findMainChartType(specs: SpecList): ChartTypes | null {
-  const types: Partial<Record<ChartTypes, number>> = Object.keys(specs).reduce<Partial<Record<ChartTypes, number>>>(
-    (acc, specId) => {
-      const { chartType } = specs[specId];
-      let accumulator = acc[chartType];
-      if (accumulator === undefined) {
-        accumulator = 0;
-      } else {
-        accumulator += 1;
-      }
-      acc[chartType] = accumulator;
-      return acc;
-    },
-    {},
-  );
-  // https://stackoverflow.com/questions/55012174/why-doesnt-object-keys-return-a-keyof-type-in-typescript
-  const chartTypes = Object.keys(types).filter((type) => type !== ChartTypes.Global);
-  if (chartTypes.length > 1) {
-    Logger.warn('Multiple chart type on the same configuration');
+function chartTypeFromSpecs(specs: SpecList): ChartTypes | null {
+  const nonGlobalTypes = Object.values(specs)
+    .map((s) => s.chartType)
+    .filter((type) => type !== ChartTypes.Global)
+    .filter(keepDistinct);
+  if (nonGlobalTypes.length !== 1) {
+    Logger.warn(`${nonGlobalTypes.length === 0 ? 'Zero' : 'Multiple'} chart types in the same configuration`);
     return null;
   }
-  return chartTypes[0] as ChartTypes;
+  return nonGlobalTypes[0];
 }
 
-function initInternalChartState(chartType: ChartTypes | null): InternalChartState | null {
+function newInternalState(chartType: ChartTypes | null): InternalChartState | null {
   switch (chartType) {
     case ChartTypes.Goal:
       return new GoalState();
@@ -473,7 +421,3 @@ function initInternalChartState(chartType: ChartTypes | null): InternalChartStat
       return null;
   }
 }
-
-function isChartTypeChanged(state: GlobalChartState, newChartType: ChartTypes | null) {
-  return state.chartType !== newChartType;
-}
diff --git a/packages/osd-charts/src/utils/common.ts b/packages/osd-charts/src/utils/common.ts
index f45051fdad51..0dda44d877bc 100644
--- a/packages/osd-charts/src/utils/common.ts
+++ b/packages/osd-charts/src/utils/common.ts
@@ -104,7 +104,7 @@ export type Datum = any; // unknown;
 export type Rotation = 0 | 90 | -90 | 180;
 /** @public */
 export type Rendering = 'canvas' | 'svg';
-export type Color = string;
+export type Color = string; // todo static/runtime type it this for proper color string content; several places in the code, and ultimate use, dictate it not be an empty string
 export type StrokeStyle = Color; // now narrower than string | CanvasGradient | CanvasPattern
 
 export const Position = Object.freeze({
@@ -539,3 +539,9 @@ export const getPercentageValue = <T>(ratio: string | number, relativeValue: num
 
   return num && !isNaN(num) ? num : defaultValue;
 };
+
+/**
+ * Predicate function, eg. to be called with [].filter, to keep distinct values
+ * @example [1, 2, 4, 2, 4, 0, 3, 2].filter(keepDistinct) ==> [1, 2, 4, 0, 3]
+ */
+export const keepDistinct = <T>(d: T, i: number, a: T[]): boolean => a.indexOf(d) === i;
diff --git a/packages/osd-charts/stories/small_multiples/6_heterogeneous_cartesians.tsx b/packages/osd-charts/stories/small_multiples/6_heterogeneous_cartesians.tsx
new file mode 100644
index 000000000000..bc70c8582713
--- /dev/null
+++ b/packages/osd-charts/stories/small_multiples/6_heterogeneous_cartesians.tsx
@@ -0,0 +1,164 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { action } from '@storybook/addon-actions';
+import { boolean } from '@storybook/addon-knobs';
+import { DateTime } from 'luxon';
+import React from 'react';
+
+import {
+  ScaleType,
+  Position,
+  Chart,
+  Axis,
+  GroupBy,
+  SmallMultiples,
+  Settings,
+  BarSeries,
+  LineAnnotation,
+  AnnotationDomainTypes,
+  LIGHT_THEME,
+  LineSeries,
+  AreaSeries,
+} from '../../src';
+import { SeededDataGenerator } from '../../src/mocks/utils';
+import { SB_SOURCE_PANEL } from '../utils/storybook';
+
+const dg = new SeededDataGenerator();
+const numOfDays = 7;
+function generateData() {
+  return dg.generateGroupedSeries(numOfDays, 2).map((d) => {
+    return {
+      ...d,
+      x: DateTime.fromFormat(`${d.x + 1}`, 'E').toFormat('EEEE'),
+      y: Math.floor(d.y * 10),
+      g: d.g === 'a' ? 'new user' : 'existing user',
+    };
+  });
+}
+const data1 = generateData();
+const data2 = generateData();
+const data3 = generateData();
+
+export const Example = () => {
+  const marker = (
+    <span
+      style={{
+        backgroundColor: 'lightgray',
+        padding: 2,
+        width: 30,
+        height: 10,
+        margin: 'auto',
+        fontSize: 8,
+        borderRadius: 2,
+      }}
+    >
+      MIN
+    </span>
+  );
+  const showLegend = boolean('Show Legend', false);
+  const onElementClick = action('onElementClick');
+
+  return (
+    <Chart className="story-chart">
+      <Settings onElementClick={onElementClick} showLegend={showLegend} />
+      <Axis id="time" title="metric" position={Position.Bottom} gridLine={{ visible: false }} />
+      <Axis id="y" title="Day of week" position={Position.Left} gridLine={{ visible: false }} />
+
+      <GroupBy
+        id="h_split"
+        by={(spec) => {
+          return spec.id;
+        }}
+        sort="alphaAsc"
+      />
+      <SmallMultiples splitHorizontally="h_split" />
+      <LineAnnotation
+        dataValues={[
+          {
+            dataValue: 100,
+            details: 'Minimum # of connected users',
+          },
+        ]}
+        id="threshold"
+        domainType={AnnotationDomainTypes.YDomain}
+        marker={marker}
+        style={{
+          line: {
+            dash: [5, 10],
+            stroke: 'black',
+            opacity: 0.8,
+            strokeWidth: 1,
+          },
+        }}
+      />
+      <BarSeries
+        id="website a"
+        xScaleType={ScaleType.Time}
+        yScaleType={ScaleType.Linear}
+        timeZone="local"
+        xAccessor="x"
+        yAccessors={['y']}
+        stackAccessors={['x']}
+        splitSeriesAccessors={['g']}
+        data={data1}
+        color={[LIGHT_THEME.colors.vizColors[0], 'lightgray']}
+      />
+      <LineSeries
+        id="website b"
+        xScaleType={ScaleType.Time}
+        yScaleType={ScaleType.Linear}
+        timeZone="local"
+        xAccessor="x"
+        yAccessors={['y']}
+        stackAccessors={['x']}
+        splitSeriesAccessors={['g']}
+        data={data2}
+        color={[LIGHT_THEME.colors.vizColors[0], 'lightgray']}
+      />
+      <AreaSeries
+        id="website c"
+        xScaleType={ScaleType.Time}
+        yScaleType={ScaleType.Linear}
+        timeZone="local"
+        xAccessor="x"
+        yAccessors={['y']}
+        stackAccessors={['x']}
+        splitSeriesAccessors={['g']}
+        data={data3}
+        color={[LIGHT_THEME.colors.vizColors[0], 'lightgray']}
+      />
+    </Chart>
+  );
+};
+
+Example.story = {
+  parameters: {
+    options: { selectedPanel: SB_SOURCE_PANEL },
+    info: {
+      text: `Similarly to the Vertical Areas example, the above chart shows an example of small multiples technique
+that splits our dataset into multiple sub-series horizontally positioned one aside the other.
+In this case, the \`<GroupBy />\` id is used to specify the horizontal split via the \`splitHorizontally\` prop.
+
+As for single charts, we can merge and handle multiple data-series together and specify a \`by\` accessor to consider
+the specific case. An additional property \`sort\` is available to configure the sorting order of the vertical or
+horizontal split.
+`,
+    },
+  },
+};
diff --git a/packages/osd-charts/stories/small_multiples/small_multiples.stories.tsx b/packages/osd-charts/stories/small_multiples/small_multiples.stories.tsx
index 40b3c66aff83..d1d9bc94272d 100644
--- a/packages/osd-charts/stories/small_multiples/small_multiples.stories.tsx
+++ b/packages/osd-charts/stories/small_multiples/small_multiples.stories.tsx
@@ -30,3 +30,4 @@ export { Example as verticalAreas } from './2_vertical_areas';
 export { Example as horizontalBars } from './4_horizontal_bars';
 export { Example as gridLines } from './3_grid_lines';
 export { Example as histogramBars } from './5_histogram_bars';
+export { Example as heterogeneous } from './6_heterogeneous_cartesians';
diff --git a/packages/osd-charts/stories/treemap/10_three_layers.tsx b/packages/osd-charts/stories/treemap/10_three_layers.tsx
index c4c7aa2b060a..fdba45775f13 100644
--- a/packages/osd-charts/stories/treemap/10_three_layers.tsx
+++ b/packages/osd-charts/stories/treemap/10_three_layers.tsx
@@ -26,6 +26,7 @@ import { ShapeTreeNode } from '../../src/chart_types/partition_chart/layout/type
 import { hueInterpolator } from '../../src/chart_types/partition_chart/layout/utils/calcs';
 import { mocks } from '../../src/mocks/hierarchical';
 import { palettes } from '../../src/mocks/hierarchical/palettes';
+import { keepDistinct } from '../../src/utils/common';
 import { STORYBOOK_LIGHT_THEME } from '../shared';
 import { countryLookup, productLookup, regionLookup } from '../utils/utils';
 
@@ -33,7 +34,7 @@ const interpolator = hueInterpolator(palettes.CET2s.map(([r, g, b]) => [r, g, b,
 
 const countries = mocks.sunburst
   .map((d: any) => d.dest)
-  .filter((d: any, i: number, a: any[]) => a.indexOf(d) === i)
+  .filter(keepDistinct)
   .sort()
   .reverse();