diff --git a/x-pack/plugins/maps/public/components/_index.scss b/x-pack/plugins/maps/public/components/_index.scss
index 76ce9f1bc79e3..726573ce4307d 100644
--- a/x-pack/plugins/maps/public/components/_index.scss
+++ b/x-pack/plugins/maps/public/components/_index.scss
@@ -1,4 +1,4 @@
 @import 'action_select';
-@import 'metric_editors';
+@import 'metrics_editor/metric_editors';
 @import './geometry_filter';
 @import 'tooltip_selector/tooltip_selector';
diff --git a/x-pack/plugins/maps/public/components/__snapshots__/metrics_editor.test.js.snap b/x-pack/plugins/maps/public/components/metrics_editor/__snapshots__/metrics_editor.test.tsx.snap
similarity index 92%
rename from x-pack/plugins/maps/public/components/__snapshots__/metrics_editor.test.js.snap
rename to x-pack/plugins/maps/public/components/metrics_editor/__snapshots__/metrics_editor.test.tsx.snap
index 0d4f1f99e464c..bd58ded41e7f5 100644
--- a/x-pack/plugins/maps/public/components/__snapshots__/metrics_editor.test.js.snap
+++ b/x-pack/plugins/maps/public/components/metrics_editor/__snapshots__/metrics_editor.test.tsx.snap
@@ -16,8 +16,9 @@ exports[`should add default count metric when metrics is empty array 1`] = `
             "type": "count",
           }
         }
-        metricsFilter={[Function]}
         onChange={[Function]}
+        onRemove={[Function]}
+        showRemoveButton={false}
       />
     </div>
   </div>
@@ -59,8 +60,9 @@ exports[`should render metrics editor 1`] = `
             "type": "sum",
           }
         }
-        metricsFilter={[Function]}
         onChange={[Function]}
+        onRemove={[Function]}
+        showRemoveButton={false}
       />
     </div>
   </div>
diff --git a/x-pack/plugins/maps/public/components/_metric_editors.scss b/x-pack/plugins/maps/public/components/metrics_editor/_metric_editors.scss
similarity index 100%
rename from x-pack/plugins/maps/public/components/_metric_editors.scss
rename to x-pack/plugins/maps/public/components/metrics_editor/_metric_editors.scss
diff --git a/x-pack/plugins/maps/public/components/metrics_editor/index.ts b/x-pack/plugins/maps/public/components/metrics_editor/index.ts
new file mode 100644
index 0000000000000..3c105c2d798ff
--- /dev/null
+++ b/x-pack/plugins/maps/public/components/metrics_editor/index.ts
@@ -0,0 +1,7 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export { MetricsEditor } from './metrics_editor';
diff --git a/x-pack/plugins/maps/public/components/metric_editor.js b/x-pack/plugins/maps/public/components/metrics_editor/metric_editor.tsx
similarity index 59%
rename from x-pack/plugins/maps/public/components/metric_editor.js
rename to x-pack/plugins/maps/public/components/metrics_editor/metric_editor.tsx
index 96b52d84653b2..543d144efdcc7 100644
--- a/x-pack/plugins/maps/public/components/metric_editor.js
+++ b/x-pack/plugins/maps/public/components/metrics_editor/metric_editor.tsx
@@ -4,18 +4,20 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import React, { Fragment } from 'react';
-import PropTypes from 'prop-types';
+import React, { ChangeEvent, Fragment } from 'react';
 import { i18n } from '@kbn/i18n';
 
-import { EuiFieldText, EuiFormRow } from '@elastic/eui';
+import { EuiButtonEmpty, EuiComboBoxOptionOption, EuiFieldText, EuiFormRow } from '@elastic/eui';
 
-import { MetricSelect, METRIC_AGGREGATION_VALUES } from './metric_select';
-import { SingleFieldSelect } from './single_field_select';
-import { AGG_TYPE } from '../../common/constants';
-import { getTermsFields } from '../index_pattern_util';
+import { FormattedMessage } from '@kbn/i18n/react';
+import { MetricSelect } from './metric_select';
+import { SingleFieldSelect } from '../single_field_select';
+import { AggDescriptor } from '../../../common/descriptor_types';
+import { AGG_TYPE } from '../../../common/constants';
+import { getTermsFields } from '../../index_pattern_util';
+import { IFieldType } from '../../../../../../src/plugins/data/public';
 
-function filterFieldsForAgg(fields, aggType) {
+function filterFieldsForAgg(fields: IFieldType[], aggType: AGG_TYPE) {
   if (!fields) {
     return [];
   }
@@ -34,8 +36,27 @@ function filterFieldsForAgg(fields, aggType) {
   });
 }
 
-export function MetricEditor({ fields, metricsFilter, metric, onChange, removeButton }) {
-  const onAggChange = (metricAggregationType) => {
+interface Props {
+  metric: AggDescriptor;
+  fields: IFieldType[];
+  onChange: (metric: AggDescriptor) => void;
+  onRemove: () => void;
+  metricsFilter?: (metricOption: EuiComboBoxOptionOption<AGG_TYPE>) => boolean;
+  showRemoveButton: boolean;
+}
+
+export function MetricEditor({
+  fields,
+  metricsFilter,
+  metric,
+  onChange,
+  showRemoveButton,
+  onRemove,
+}: Props) {
+  const onAggChange = (metricAggregationType?: AGG_TYPE) => {
+    if (!metricAggregationType) {
+      return;
+    }
     const newMetricProps = {
       ...metric,
       type: metricAggregationType,
@@ -54,13 +75,16 @@ export function MetricEditor({ fields, metricsFilter, metric, onChange, removeBu
 
     onChange(newMetricProps);
   };
-  const onFieldChange = (fieldName) => {
+  const onFieldChange = (fieldName?: string) => {
+    if (!fieldName) {
+      return;
+    }
     onChange({
       ...metric,
       field: fieldName,
     });
   };
-  const onLabelChange = (e) => {
+  const onLabelChange = (e: ChangeEvent<HTMLInputElement>) => {
     onChange({
       ...metric,
       label: e.target.value,
@@ -80,7 +104,7 @@ export function MetricEditor({ fields, metricsFilter, metric, onChange, removeBu
           placeholder={i18n.translate('xpack.maps.metricsEditor.selectFieldPlaceholder', {
             defaultMessage: 'Select field',
           })}
-          value={metric.field}
+          value={metric.field ? metric.field : null}
           onChange={onFieldChange}
           fields={filterFieldsForAgg(fields, metric.type)}
           isClearable={false}
@@ -108,6 +132,28 @@ export function MetricEditor({ fields, metricsFilter, metric, onChange, removeBu
     );
   }
 
+  let removeButton;
+  if (showRemoveButton) {
+    removeButton = (
+      <div className="mapMetricEditorPanel__metricRemoveButton">
+        <EuiButtonEmpty
+          iconType="trash"
+          size="xs"
+          color="danger"
+          onClick={onRemove}
+          aria-label={i18n.translate('xpack.maps.metricsEditor.deleteMetricAriaLabel', {
+            defaultMessage: 'Delete metric',
+          })}
+        >
+          <FormattedMessage
+            id="xpack.maps.metricsEditor.deleteMetricButtonLabel"
+            defaultMessage="Delete metric"
+          />
+        </EuiButtonEmpty>
+      </div>
+    );
+  }
+
   return (
     <Fragment>
       <EuiFormRow
@@ -130,14 +176,3 @@ export function MetricEditor({ fields, metricsFilter, metric, onChange, removeBu
     </Fragment>
   );
 }
-
-MetricEditor.propTypes = {
-  metric: PropTypes.shape({
-    type: PropTypes.oneOf(METRIC_AGGREGATION_VALUES),
-    field: PropTypes.string,
-    label: PropTypes.string,
-  }),
-  fields: PropTypes.array,
-  onChange: PropTypes.func.isRequired,
-  metricsFilter: PropTypes.func,
-};
diff --git a/x-pack/plugins/maps/public/components/metric_select.js b/x-pack/plugins/maps/public/components/metrics_editor/metric_select.tsx
similarity index 80%
rename from x-pack/plugins/maps/public/components/metric_select.js
rename to x-pack/plugins/maps/public/components/metrics_editor/metric_select.tsx
index 2ebfcf99dece6..197c5466fe0fd 100644
--- a/x-pack/plugins/maps/public/components/metric_select.js
+++ b/x-pack/plugins/maps/public/components/metrics_editor/metric_select.tsx
@@ -5,10 +5,9 @@
  */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 import { i18n } from '@kbn/i18n';
-import { EuiComboBox } from '@elastic/eui';
-import { AGG_TYPE } from '../../common/constants';
+import { EuiComboBox, EuiComboBoxOptionOption, EuiComboBoxProps } from '@elastic/eui';
+import { AGG_TYPE } from '../../../common/constants';
 
 const AGG_OPTIONS = [
   {
@@ -55,17 +54,19 @@ const AGG_OPTIONS = [
   },
 ];
 
-export const METRIC_AGGREGATION_VALUES = AGG_OPTIONS.map(({ value }) => {
-  return value;
-});
+type Props = Omit<EuiComboBoxProps<AGG_TYPE>, 'onChange'> & {
+  value: AGG_TYPE;
+  onChange: (aggType: AGG_TYPE) => void;
+  metricsFilter?: (metricOption: EuiComboBoxOptionOption<AGG_TYPE>) => boolean;
+};
 
-export function MetricSelect({ value, onChange, metricsFilter, ...rest }) {
-  function onAggChange(selectedOptions) {
+export function MetricSelect({ value, onChange, metricsFilter, ...rest }: Props) {
+  function onAggChange(selectedOptions: Array<EuiComboBoxOptionOption<AGG_TYPE>>) {
     if (selectedOptions.length === 0) {
       return;
     }
 
-    const aggType = selectedOptions[0].value;
+    const aggType = selectedOptions[0].value!;
     onChange(aggType);
   }
 
@@ -87,9 +88,3 @@ export function MetricSelect({ value, onChange, metricsFilter, ...rest }) {
     />
   );
 }
-
-MetricSelect.propTypes = {
-  metricsFilter: PropTypes.func,
-  value: PropTypes.oneOf(METRIC_AGGREGATION_VALUES),
-  onChange: PropTypes.func.isRequired,
-};
diff --git a/x-pack/plugins/maps/public/components/metrics_editor.test.js b/x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.test.tsx
similarity index 84%
rename from x-pack/plugins/maps/public/components/metrics_editor.test.js
rename to x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.test.tsx
index bcbeef29875ee..7ce7fbce2b066 100644
--- a/x-pack/plugins/maps/public/components/metrics_editor.test.js
+++ b/x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.test.tsx
@@ -7,7 +7,7 @@
 import React from 'react';
 import { shallow } from 'enzyme';
 import { MetricsEditor } from './metrics_editor';
-import { AGG_TYPE } from '../../common/constants';
+import { AGG_TYPE } from '../../../common/constants';
 
 const defaultProps = {
   metrics: [
@@ -19,15 +19,14 @@ const defaultProps = {
   fields: [],
   onChange: () => {},
   allowMultipleMetrics: true,
-  metricsFilter: () => {},
 };
 
-test('should render metrics editor', async () => {
+test('should render metrics editor', () => {
   const component = shallow(<MetricsEditor {...defaultProps} />);
   expect(component).toMatchSnapshot();
 });
 
-test('should add default count metric when metrics is empty array', async () => {
+test('should add default count metric when metrics is empty array', () => {
   const component = shallow(<MetricsEditor {...defaultProps} metrics={[]} />);
   expect(component).toMatchSnapshot();
 });
diff --git a/x-pack/plugins/maps/public/components/metrics_editor.js b/x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.tsx
similarity index 54%
rename from x-pack/plugins/maps/public/components/metrics_editor.js
rename to x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.tsx
index 7d4d7bf3ec7ab..17cfc5f62fee5 100644
--- a/x-pack/plugins/maps/public/components/metrics_editor.js
+++ b/x-pack/plugins/maps/public/components/metrics_editor/metrics_editor.tsx
@@ -5,48 +5,43 @@
  */
 
 import React, { Fragment } from 'react';
-import PropTypes from 'prop-types';
-import { i18n } from '@kbn/i18n';
 import { FormattedMessage } from '@kbn/i18n/react';
-import { EuiButtonEmpty, EuiSpacer, EuiTextAlign } from '@elastic/eui';
+import { EuiButtonEmpty, EuiComboBoxOptionOption, EuiSpacer, EuiTextAlign } from '@elastic/eui';
 import { MetricEditor } from './metric_editor';
-import { DEFAULT_METRIC } from '../classes/sources/es_agg_source';
+// @ts-expect-error
+import { DEFAULT_METRIC } from '../../classes/sources/es_agg_source';
+import { IFieldType } from '../../../../../../src/plugins/data/public';
+import { AggDescriptor } from '../../../common/descriptor_types';
+import { AGG_TYPE } from '../../../common/constants';
 
-export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics, metricsFilter }) {
+interface Props {
+  allowMultipleMetrics: boolean;
+  metrics: AggDescriptor[];
+  fields: IFieldType[];
+  onChange: (metrics: AggDescriptor[]) => void;
+  metricsFilter?: (metricOption: EuiComboBoxOptionOption<AGG_TYPE>) => boolean;
+}
+
+export function MetricsEditor({
+  fields,
+  metrics = [DEFAULT_METRIC],
+  onChange,
+  allowMultipleMetrics = true,
+  metricsFilter,
+}: Props) {
   function renderMetrics() {
     // There was a bug in 7.8 that initialized metrics to [].
     // This check is needed to handle any saved objects created before the bug was patched.
     const nonEmptyMetrics = metrics.length === 0 ? [DEFAULT_METRIC] : metrics;
     return nonEmptyMetrics.map((metric, index) => {
-      const onMetricChange = (metric) => {
-        onChange([...metrics.slice(0, index), metric, ...metrics.slice(index + 1)]);
+      const onMetricChange = (updatedMetric: AggDescriptor) => {
+        onChange([...metrics.slice(0, index), updatedMetric, ...metrics.slice(index + 1)]);
       };
 
       const onRemove = () => {
         onChange([...metrics.slice(0, index), ...metrics.slice(index + 1)]);
       };
 
-      let removeButton;
-      if (index > 0) {
-        removeButton = (
-          <div className="mapMetricEditorPanel__metricRemoveButton">
-            <EuiButtonEmpty
-              iconType="trash"
-              size="xs"
-              color="danger"
-              onClick={onRemove}
-              aria-label={i18n.translate('xpack.maps.metricsEditor.deleteMetricAriaLabel', {
-                defaultMessage: 'Delete metric',
-              })}
-            >
-              <FormattedMessage
-                id="xpack.maps.metricsEditor.deleteMetricButtonLabel"
-                defaultMessage="Delete metric"
-              />
-            </EuiButtonEmpty>
-          </div>
-        );
-      }
       return (
         <div key={index} className="mapMetricEditorPanel__metricEditor">
           <MetricEditor
@@ -54,7 +49,8 @@ export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics,
             metric={metric}
             fields={fields}
             metricsFilter={metricsFilter}
-            removeButton={removeButton}
+            showRemoveButton={index > 0}
+            onRemove={onRemove}
           />
         </div>
       );
@@ -62,7 +58,7 @@ export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics,
   }
 
   function addMetric() {
-    onChange([...metrics, {}]);
+    onChange([...metrics, { type: AGG_TYPE.AVG }]);
   }
 
   function renderAddMetricButton() {
@@ -71,7 +67,7 @@ export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics,
     }
 
     return (
-      <>
+      <Fragment>
         <EuiSpacer size="xs" />
         <EuiTextAlign textAlign="center">
           <EuiButtonEmpty onClick={addMetric} size="xs" iconType="plusInCircleFilled">
@@ -81,7 +77,7 @@ export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics,
             />
           </EuiButtonEmpty>
         </EuiTextAlign>
-      </>
+      </Fragment>
     );
   }
 
@@ -93,16 +89,3 @@ export function MetricsEditor({ fields, metrics, onChange, allowMultipleMetrics,
     </Fragment>
   );
 }
-
-MetricsEditor.propTypes = {
-  metrics: PropTypes.array,
-  fields: PropTypes.array,
-  onChange: PropTypes.func.isRequired,
-  allowMultipleMetrics: PropTypes.bool,
-  metricsFilter: PropTypes.func,
-};
-
-MetricsEditor.defaultProps = {
-  metrics: [DEFAULT_METRIC],
-  allowMultipleMetrics: true,
-};
diff --git a/x-pack/plugins/maps/public/connected_components/layer_panel/join_editor/resources/metrics_expression.test.js b/x-pack/plugins/maps/public/connected_components/layer_panel/join_editor/resources/metrics_expression.test.js
index 3cd8a3c42879a..e0e1556ecde06 100644
--- a/x-pack/plugins/maps/public/connected_components/layer_panel/join_editor/resources/metrics_expression.test.js
+++ b/x-pack/plugins/maps/public/connected_components/layer_panel/join_editor/resources/metrics_expression.test.js
@@ -4,12 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-jest.mock('../../../../components/metric_editor', () => ({
-  MetricsEditor: () => {
-    return <div>mockMetricsEditor</div>;
-  },
-}));
-
 import React from 'react';
 import { shallow } from 'enzyme';
 import { MetricsExpression } from './metrics_expression';