diff --git a/frontend/src/metabase/parameters/components/ParameterTargetList.jsx b/frontend/src/metabase/parameters/components/ParameterTargetList.jsx
index c1ef22acb9d705500177b0aee336b8e6a8ee0525..a670ca3bb091cf1144fbb1c7cc90a45c3f3ec481 100644
--- a/frontend/src/metabase/parameters/components/ParameterTargetList.jsx
+++ b/frontend/src/metabase/parameters/components/ParameterTargetList.jsx
@@ -6,19 +6,8 @@ import Icon from "metabase/components/Icon";
 
 import _ from "underscore";
 
-import type {
-  ParameterMappingUIOption,
-  ParameterTarget,
-} from "metabase-types/types/Parameter";
-
-type Props = {
-  target: ?ParameterTarget,
-  onChange: (target: ?ParameterTarget) => void,
-  mappingOptions: ParameterMappingUIOption[],
-};
-
 export default class ParameterTargetList extends React.Component {
-  props: Props;
+  props;
 
   render() {
     const { target, mappingOptions } = this.props;
diff --git a/frontend/src/metabase/parameters/components/ParameterTargetWidget.jsx b/frontend/src/metabase/parameters/components/ParameterTargetWidget.jsx
index d6bcf1e9008aa1aad30d750dd09eb4e234e127ba..0436ff606d1ad52e47fba48911568f2916fb67d2 100644
--- a/frontend/src/metabase/parameters/components/ParameterTargetWidget.jsx
+++ b/frontend/src/metabase/parameters/components/ParameterTargetWidget.jsx
@@ -8,21 +8,8 @@ import SelectButton from "metabase/components/SelectButton";
 import _ from "underscore";
 import cx from "classnames";
 
-import type {
-  ParameterMappingUIOption,
-  ParameterTarget,
-} from "metabase-types/types/Parameter";
-
-type Props = {
-  target: ?ParameterTarget,
-  onChange: (target: ?ParameterTarget) => void,
-  mappingOptions: ParameterMappingUIOption[],
-  placeholder?: string,
-  children?: React.Element | (any => React.Element),
-};
-
 export default class ParameterTargetWidget extends React.Component {
-  constructor(props: Props) {
+  constructor(props) {
     super(props);
 
     this.popover = React.createRef();
diff --git a/frontend/src/metabase/parameters/components/ParametersList.jsx b/frontend/src/metabase/parameters/components/ParametersList.jsx
index eb640feae3853408aa7489bdaab6ef688c514a6d..b6bfabb92877935a75616a541f8d46a568cb4046 100644
--- a/frontend/src/metabase/parameters/components/ParametersList.jsx
+++ b/frontend/src/metabase/parameters/components/ParametersList.jsx
@@ -11,27 +11,6 @@ import {
 } from "metabase/components/sortable";
 import { getVisibleParameters } from "metabase/parameters/utils/ui";
 
-import type { ParameterId, Parameter } from "metabase-types/types/Parameter";
-import type { DashboardWithCards } from "metabase-types/types/Dashboard";
-
-type Props = {
-  className?: string,
-
-  parameters: Parameter[],
-  dashboard?: DashboardWithCards,
-  editingParameter?: ?Parameter,
-
-  isFullscreen?: boolean,
-  isNightMode?: boolean,
-  hideParameters?: ?string, // comma separated list of slugs
-  isEditing?: boolean,
-  vertical?: boolean,
-  commitImmediately?: boolean,
-
-  setParameterIndex?: (parameterId: ParameterId, index: number) => void,
-  setEditingParameter?: (parameterId: ParameterId) => void,
-};
-
 const StaticParameterWidgetList = ({
   children,
   onSortStart,
@@ -70,18 +49,12 @@ function ParametersList({
   setParameterIndex,
   removeParameter,
   setEditingParameter,
-}: Props) {
+}) {
   const handleSortStart = () => {
     document.body.classList.add("grabbing");
   };
 
-  const handleSortEnd = ({
-    oldIndex,
-    newIndex,
-  }: {
-    oldIndex: number,
-    newIndex: number,
-  }) => {
+  const handleSortEnd = ({ oldIndex, newIndex }) => {
     document.body.classList.remove("grabbing");
     if (setParameterIndex) {
       setParameterIndex(parameters[oldIndex].id, newIndex);
diff --git a/frontend/src/metabase/parameters/components/widgets/DateAllOptionsWidget.jsx b/frontend/src/metabase/parameters/components/widgets/DateAllOptionsWidget.jsx
index 744d94e2d71b36cd0f0f889fb4ab473ab3f73b45..03765f1a248f2acd40181212dba96aedf7ce15d2 100644
--- a/frontend/src/metabase/parameters/components/widgets/DateAllOptionsWidget.jsx
+++ b/frontend/src/metabase/parameters/components/widgets/DateAllOptionsWidget.jsx
@@ -10,26 +10,14 @@ import FilterOptions from "metabase/query_builder/components/filters/FilterOptio
 import { generateTimeFilterValuesDescriptions } from "metabase/lib/query_time";
 import { dateParameterValueToMBQL } from "metabase/parameters/utils/mbql";
 
-import type { OperatorName } from "metabase/query_builder/components/filters/pickers/DatePicker";
-import type {
-  FieldFilter,
-  LocalFieldReference,
-} from "metabase-types/types/Query";
-
-type UrlEncoded = string;
-
 // Use a placeholder value as field references are not used in dashboard filters
-const noopRef: LocalFieldReference = null;
+const noopRef = null;
 
-function getFilterValueSerializer(
-  func: (val1: string, val2: string) => UrlEncoded,
-) {
+function getFilterValueSerializer(func) {
   return filter => func(filter[2], filter[3], filter[4] || {});
 }
 
-const serializersByOperatorName: {
-  [id: OperatorName]: (FieldFilter) => UrlEncoded,
-} = {
+const serializersByOperatorName = {
   previous: getFilterValueSerializer(
     (value, unit, options = {}) =>
       `past${-value}${unit}s${options["include-current"] ? "~" : ""}`,
@@ -48,7 +36,7 @@ const serializersByOperatorName: {
 function getFilterOperator(filter) {
   return DATE_OPERATORS.find(op => op.test(filter));
 }
-function filterToUrlEncoded(filter: FieldFilter): ?UrlEncoded {
+function filterToUrlEncoded(filter) {
   const operator = getFilterOperator(filter);
 
   if (operator) {
@@ -58,7 +46,7 @@ function filterToUrlEncoded(filter: FieldFilter): ?UrlEncoded {
   }
 }
 
-const prefixedOperators: Set<OperatorName> = new Set([
+const prefixedOperators = new Set([
   "before",
   "after",
   "on",
@@ -73,18 +61,11 @@ function getFilterTitle(filter) {
   return prefix + desc;
 }
 
-type Props = {
-  setValue: (value: ?string) => void,
-  onClose: () => void,
-};
-
-type State = { filter: FieldFilter };
-
 export default class DateAllOptionsWidget extends Component {
-  props: Props;
-  state: State;
+  props;
+  state;
 
-  constructor(props: Props) {
+  constructor(props) {
     super(props);
 
     this.state = {
@@ -98,7 +79,7 @@ export default class DateAllOptionsWidget extends Component {
   static propTypes = {};
   static defaultProps = {};
 
-  static format = (urlEncoded: ?string) => {
+  static format = urlEncoded => {
     if (urlEncoded == null) {
       return null;
     }
@@ -112,7 +93,7 @@ export default class DateAllOptionsWidget extends Component {
     this.props.onClose();
   };
 
-  setFilter = (filter: FieldFilter) => {
+  setFilter = filter => {
     this.setState({ filter });
   };
 
diff --git a/frontend/src/metabase/parameters/utils/dashboards.js b/frontend/src/metabase/parameters/utils/dashboards.js
index 81a01e7b22742fe8bba5c0ae2dc80f0f9ebae6bf..5caef3ab4243b89529b5b044dc59897b18509b9a 100644
--- a/frontend/src/metabase/parameters/utils/dashboards.js
+++ b/frontend/src/metabase/parameters/utils/dashboards.js
@@ -23,7 +23,7 @@ export function createParameter(option, parameters = []) {
   return setParameterName(parameter, name);
 }
 
-export function setParameterName(parameter, name: string) {
+export function setParameterName(parameter, name) {
   if (!name) {
     name = "unnamed";
   }
@@ -35,7 +35,7 @@ export function setParameterName(parameter, name: string) {
   };
 }
 
-export function setParameterDefaultValue(parameter, value: string) {
+export function setParameterDefaultValue(parameter, value) {
   return {
     ...parameter,
     default: value,