diff --git a/app/javascript/components/TypesDeChampEditor/Flash.js b/app/javascript/components/TypesDeChampEditor/Flash.ts
similarity index 61%
rename from app/javascript/components/TypesDeChampEditor/Flash.js
rename to app/javascript/components/TypesDeChampEditor/Flash.ts
index 945c6efd8..302c88c9f 100644
--- a/app/javascript/components/TypesDeChampEditor/Flash.js
+++ b/app/javascript/components/TypesDeChampEditor/Flash.ts
@@ -1,6 +1,14 @@
-export default class Flash {
-  constructor(isAnnotation) {
-    this.element = document.querySelector('#flash_messages');
+import invariant from 'tiny-invariant';
+
+export class Flash {
+  element: HTMLDivElement;
+  isAnnotation: boolean;
+  timeout?: number;
+
+  constructor(isAnnotation: boolean) {
+    const element = document.querySelector<HTMLDivElement>('#flash_messages');
+    invariant(element, 'Flash element is required');
+    this.element = element;
     this.isAnnotation = isAnnotation;
   }
   success() {
@@ -10,13 +18,13 @@ export default class Flash {
       this.add('Formulaire enregistré.');
     }
   }
-  error(message) {
+  error(message: string) {
     this.add(message, true);
   }
   clear() {
     this.element.innerHTML = '';
   }
-  add(message, isError) {
+  add(message: string, isError = false) {
     const html = `<div id="flash_message" class="center">
       <div class="alert alert-fixed ${
         isError ? 'alert-danger' : 'alert-success'
diff --git a/app/javascript/components/TypesDeChampEditor/OperationsQueue.js b/app/javascript/components/TypesDeChampEditor/OperationsQueue.ts
similarity index 58%
rename from app/javascript/components/TypesDeChampEditor/OperationsQueue.js
rename to app/javascript/components/TypesDeChampEditor/OperationsQueue.ts
index 46069491d..0da09cebc 100644
--- a/app/javascript/components/TypesDeChampEditor/OperationsQueue.js
+++ b/app/javascript/components/TypesDeChampEditor/OperationsQueue.ts
@@ -1,9 +1,21 @@
 import { getJSON } from '@utils';
+import invariant from 'tiny-invariant';
 
-export default class OperationsQueue {
-  constructor(baseUrl) {
+type Operation = {
+  path: string;
+  method: string;
+  payload: unknown;
+  resolve: (value: unknown) => void;
+  reject: () => void;
+};
+
+export class OperationsQueue {
+  queue: Operation[];
+  isRunning = false;
+  baseUrl: string;
+
+  constructor(baseUrl: string) {
     this.queue = [];
-    this.isRunning = false;
     this.baseUrl = baseUrl;
   }
 
@@ -11,6 +23,7 @@ export default class OperationsQueue {
     if (this.queue.length > 0) {
       this.isRunning = true;
       const operation = this.queue.shift();
+      invariant(operation, 'Operation is required');
       await this.exec(operation);
       this.run();
     } else {
@@ -18,7 +31,7 @@ export default class OperationsQueue {
     }
   }
 
-  enqueue(operation) {
+  enqueue(operation: Omit<Operation, 'resolve' | 'reject'>) {
     return new Promise((resolve, reject) => {
       this.queue.push({ ...operation, resolve, reject });
       if (!this.isRunning) {
@@ -27,7 +40,7 @@ export default class OperationsQueue {
     });
   }
 
-  async exec(operation) {
+  async exec(operation: Operation) {
     const { path, method, payload, resolve, reject } = operation;
     const url = `${this.baseUrl}${path}`;
 
@@ -35,12 +48,19 @@ export default class OperationsQueue {
       const data = await getJSON(url, payload, method);
       resolve(data);
     } catch (e) {
-      handleError(e, reject);
+      handleError(e as OperationError, reject);
     }
   }
 }
 
-async function handleError({ response, message }, reject) {
+class OperationError extends Error {
+  response?: Response;
+}
+
+async function handleError(
+  { response, message }: OperationError,
+  reject: (error: string) => void
+) {
   if (response) {
     try {
       const {
diff --git a/app/javascript/components/TypesDeChampEditor/components/DescriptionInput.jsx b/app/javascript/components/TypesDeChampEditor/components/DescriptionInput.tsx
similarity index 66%
rename from app/javascript/components/TypesDeChampEditor/components/DescriptionInput.jsx
rename to app/javascript/components/TypesDeChampEditor/components/DescriptionInput.tsx
index 2d17f752c..a87da30b7 100644
--- a/app/javascript/components/TypesDeChampEditor/components/DescriptionInput.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/DescriptionInput.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function DescriptionInput({ isVisible, handler }) {
+import type { Handler } from '../types';
+
+export function DescriptionInput({
+  isVisible,
+  handler
+}: {
+  isVisible: boolean;
+  handler: Handler<HTMLTextAreaElement>;
+}) {
   if (isVisible) {
     return (
       <div className="cell">
@@ -20,10 +27,3 @@ function DescriptionInput({ isVisible, handler }) {
   }
   return null;
 }
-
-DescriptionInput.propTypes = {
-  isVisible: PropTypes.bool,
-  handler: PropTypes.object
-};
-
-export default DescriptionInput;
diff --git a/app/javascript/components/TypesDeChampEditor/components/LibelleInput.jsx b/app/javascript/components/TypesDeChampEditor/components/LibelleInput.tsx
similarity index 66%
rename from app/javascript/components/TypesDeChampEditor/components/LibelleInput.jsx
rename to app/javascript/components/TypesDeChampEditor/components/LibelleInput.tsx
index f1ca7c07c..c7490cec6 100644
--- a/app/javascript/components/TypesDeChampEditor/components/LibelleInput.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/LibelleInput.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function LibelleInput({ isVisible, handler }) {
+import type { Handler } from '../types';
+
+export function LibelleInput({
+  isVisible,
+  handler
+}: {
+  isVisible: boolean;
+  handler: Handler<HTMLInputElement>;
+}) {
   if (isVisible) {
     return (
       <div className="cell libelle">
@@ -19,10 +26,3 @@ function LibelleInput({ isVisible, handler }) {
   }
   return null;
 }
-
-LibelleInput.propTypes = {
-  handler: PropTypes.object,
-  isVisible: PropTypes.bool
-};
-
-export default LibelleInput;
diff --git a/app/javascript/components/TypesDeChampEditor/components/MandatoryInput.jsx b/app/javascript/components/TypesDeChampEditor/components/MandatoryInput.tsx
similarity index 66%
rename from app/javascript/components/TypesDeChampEditor/components/MandatoryInput.jsx
rename to app/javascript/components/TypesDeChampEditor/components/MandatoryInput.tsx
index 436a23345..9a13cc161 100644
--- a/app/javascript/components/TypesDeChampEditor/components/MandatoryInput.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/MandatoryInput.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function MandatoryInput({ isVisible, handler }) {
+import type { Handler } from '../types';
+
+export function MandatoryInput({
+  isVisible,
+  handler
+}: {
+  isVisible: boolean;
+  handler: Handler<HTMLInputElement>;
+}) {
   if (isVisible) {
     return (
       <div className="cell">
@@ -19,10 +26,3 @@ function MandatoryInput({ isVisible, handler }) {
   }
   return null;
 }
-
-MandatoryInput.propTypes = {
-  handler: PropTypes.object,
-  isVisible: PropTypes.bool
-};
-
-export default MandatoryInput;
diff --git a/app/javascript/components/TypesDeChampEditor/components/MoveButton.jsx b/app/javascript/components/TypesDeChampEditor/components/MoveButton.tsx
similarity index 56%
rename from app/javascript/components/TypesDeChampEditor/components/MoveButton.jsx
rename to app/javascript/components/TypesDeChampEditor/components/MoveButton.tsx
index c8ec442f9..15796767a 100644
--- a/app/javascript/components/TypesDeChampEditor/components/MoveButton.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/MoveButton.tsx
@@ -1,8 +1,17 @@
-import React from 'react';
-import PropTypes from 'prop-types';
+import React, { MouseEventHandler } from 'react';
 import { ArrowDownIcon, ArrowUpIcon } from '@heroicons/react/solid';
 
-function MoveButton({ isEnabled, icon, title, onClick }) {
+export function MoveButton({
+  isEnabled,
+  icon,
+  title,
+  onClick
+}: {
+  isEnabled: boolean;
+  icon: string;
+  title: string;
+  onClick: MouseEventHandler<HTMLButtonElement>;
+}) {
   return (
     <button
       className="button small move"
@@ -18,12 +27,3 @@ function MoveButton({ isEnabled, icon, title, onClick }) {
     </button>
   );
 }
-
-MoveButton.propTypes = {
-  isEnabled: PropTypes.bool,
-  icon: PropTypes.string,
-  title: PropTypes.string,
-  onClick: PropTypes.func
-};
-
-export default MoveButton;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.tsx
similarity index 77%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.tsx
index 68a83fc9c..4fd8c31c7 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChamp.tsx
@@ -1,24 +1,40 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-import { sortableElement, sortableHandle } from 'react-sortable-hoc';
+import React, { Dispatch } from 'react';
+import { SortableElement, SortableHandle } from 'react-sortable-hoc';
 import { useInView } from 'react-intersection-observer';
 import { TrashIcon } from '@heroicons/react/outline';
 
-import DescriptionInput from './DescriptionInput';
-import LibelleInput from './LibelleInput';
-import MandatoryInput from './MandatoryInput';
-import MoveButton from './MoveButton';
-import TypeDeChampCarteOption from './TypeDeChampCarteOption';
-import TypeDeChampCarteOptions from './TypeDeChampCarteOptions';
-import TypeDeChampDropDownOptions from './TypeDeChampDropDownOptions';
-import TypeDeChampDropDownOther from './TypeDeChampDropDownOther';
-import TypeDeChampPieceJustificative from './TypeDeChampPieceJustificative';
-import TypeDeChampRepetitionOptions from './TypeDeChampRepetitionOptions';
-import TypeDeChampTypesSelect from './TypeDeChampTypesSelect';
-import TypeDeChampDropDownSecondary from './TypeDeChampDropDownSecondary';
+import type { Action, TypeDeChamp, State, Handler } from '../types';
+import { DescriptionInput } from './DescriptionInput';
+import { LibelleInput } from './LibelleInput';
+import { MandatoryInput } from './MandatoryInput';
+import { MoveButton } from './MoveButton';
+import { TypeDeChampCarteOption } from './TypeDeChampCarteOption';
+import { TypeDeChampCarteOptions } from './TypeDeChampCarteOptions';
+import { TypeDeChampDropDownOptions } from './TypeDeChampDropDownOptions';
+import { TypeDeChampDropDownOther } from './TypeDeChampDropDownOther';
+import { TypeDeChampPieceJustificative } from './TypeDeChampPieceJustificative';
+import { TypeDeChampRepetitionOptions } from './TypeDeChampRepetitionOptions';
+import { TypeDeChampTypesSelect } from './TypeDeChampTypesSelect';
+import { TypeDeChampDropDownSecondary } from './TypeDeChampDropDownSecondary';
 
-const TypeDeChamp = sortableElement(
-  ({ typeDeChamp, dispatch, idx: index, isFirstItem, isLastItem, state }) => {
+type TypeDeChampProps = {
+  typeDeChamp: TypeDeChamp;
+  dispatch: Dispatch<Action>;
+  idx: number;
+  isFirstItem: boolean;
+  isLastItem: boolean;
+  state: State;
+};
+
+export const TypeDeChampComponent = SortableElement<TypeDeChampProps>(
+  ({
+    typeDeChamp,
+    dispatch,
+    idx: index,
+    isFirstItem,
+    isLastItem,
+    state
+  }: TypeDeChampProps) => {
     const isDropDown = [
       'drop_down_list',
       'multiple_drop_down_list',
@@ -175,23 +191,25 @@ const TypeDeChamp = sortableElement(
   }
 );
 
-TypeDeChamp.propTypes = {
-  dispatch: PropTypes.func,
-  idx: PropTypes.number,
-  isFirstItem: PropTypes.bool,
-  isLastItem: PropTypes.bool,
-  state: PropTypes.object,
-  typeDeChamp: PropTypes.object
-};
-
-const DragHandle = sortableHandle(() => (
+const DragHandle = SortableHandle(() => (
   <div
     className="handle small icon-only icon move-handle"
     title="Déplacer le champ vers le haut ou vers le bas"
   />
 ));
 
-function createUpdateHandler(dispatch, typeDeChamp, field, index, prefix) {
+type HandlerInputElement =
+  | HTMLInputElement
+  | HTMLTextAreaElement
+  | HTMLSelectElement;
+
+function createUpdateHandler(
+  dispatch: Dispatch<Action>,
+  typeDeChamp: TypeDeChamp,
+  field: keyof TypeDeChamp,
+  index: number,
+  prefix?: string
+): Handler<HandlerInputElement> {
   return {
     id: `${prefix ? `${prefix}-` : ''}champ-${index}-${field}`,
     name: field,
@@ -209,25 +227,22 @@ function createUpdateHandler(dispatch, typeDeChamp, field, index, prefix) {
   };
 }
 
-function getValue(obj, path) {
-  const [, optionsPath] = path.split('.');
-  if (optionsPath) {
-    return (obj.editable_options || {})[optionsPath];
-  }
-  return obj[path];
-}
-
-function createUpdateHandlers(dispatch, typeDeChamp, index, prefix) {
+function createUpdateHandlers(
+  dispatch: Dispatch<Action>,
+  typeDeChamp: TypeDeChamp,
+  index: number,
+  prefix?: string
+) {
   return FIELDS.reduce((handlers, field) => {
     handlers[field] = createUpdateHandler(
       dispatch,
       typeDeChamp,
-      field,
+      field as keyof TypeDeChamp,
       index,
       prefix
     );
     return handlers;
-  }, {});
+  }, {} as Record<string, Handler<HandlerInputElement>>);
 }
 
 const OPTIONS_FIELDS = {
@@ -242,7 +257,7 @@ const OPTIONS_FIELDS = {
   'options.natura_2000': 'Natura 2000',
   'options.zones_humides': 'Zones humides d’importance internationale',
   'options.znieff': 'ZNIEFF'
-};
+} as const;
 
 export const FIELDS = [
   'description',
@@ -257,10 +272,20 @@ export const FIELDS = [
   'drop_down_secondary_libelle',
   'drop_down_secondary_description',
   ...Object.keys(OPTIONS_FIELDS)
-];
+] as const;
 
-function readValue(input) {
-  return input.type === 'checkbox' ? input.checked : input.value;
+function getValue(obj: TypeDeChamp, path: string) {
+  const [, optionsPath] = path.split('.');
+  if (optionsPath) {
+    return (obj.editable_options || {})[optionsPath];
+  }
+  return obj[path as keyof TypeDeChamp] as string;
+}
+
+function readValue(input: HandlerInputElement) {
+  return input.type === 'checkbox' && 'checked' in input
+    ? input.checked
+    : input.value;
 }
 
 const EXCLUDE_FROM_REPETITION = [
@@ -269,5 +294,3 @@ const EXCLUDE_FROM_REPETITION = [
   'repetition',
   'siret'
 ];
-
-export default TypeDeChamp;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.tsx
similarity index 58%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.tsx
index 8de18874f..167fa7903 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOption.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function TypeDeChampCarteOption({ label, handler }) {
+import type { Handler } from '../types';
+
+export function TypeDeChampCarteOption({
+  label,
+  handler
+}: {
+  label: string;
+  handler: Handler<HTMLInputElement>;
+}) {
   return (
     <label htmlFor={handler.id}>
       <input
@@ -16,10 +23,3 @@ function TypeDeChampCarteOption({ label, handler }) {
     </label>
   );
 }
-
-TypeDeChampCarteOption.propTypes = {
-  label: PropTypes.string,
-  handler: PropTypes.object
-};
-
-export default TypeDeChampCarteOption;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.jsx
deleted file mode 100644
index 61fd463fd..000000000
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.jsx
+++ /dev/null
@@ -1,21 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-
-function TypeDeChampCarteOptions({ isVisible, children }) {
-  if (isVisible) {
-    return (
-      <div className="cell">
-        <label>Utilisation de la cartographie</label>
-        <div className="carte-options">{children}</div>
-      </div>
-    );
-  }
-  return null;
-}
-
-TypeDeChampCarteOptions.propTypes = {
-  isVisible: PropTypes.bool,
-  children: PropTypes.node
-};
-
-export default TypeDeChampCarteOptions;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.tsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.tsx
new file mode 100644
index 000000000..ceca4792d
--- /dev/null
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampCarteOptions.tsx
@@ -0,0 +1,19 @@
+import React, { ReactNode } from 'react';
+
+export function TypeDeChampCarteOptions({
+  isVisible,
+  children
+}: {
+  isVisible: boolean;
+  children: ReactNode;
+}) {
+  if (isVisible) {
+    return (
+      <div className="cell">
+        <label>Utilisation de la cartographie</label>
+        <div className="carte-options">{children}</div>
+      </div>
+    );
+  }
+  return null;
+}
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.tsx
similarity index 65%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.tsx
index 148e179ba..bc9a950bf 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOptions.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function TypeDeChampDropDownOptions({ isVisible, handler }) {
+import type { Handler } from '../types';
+
+export function TypeDeChampDropDownOptions({
+  isVisible,
+  handler
+}: {
+  isVisible: boolean;
+  handler: Handler<HTMLTextAreaElement>;
+}) {
   if (isVisible) {
     return (
       <div className="cell">
@@ -21,11 +28,3 @@ function TypeDeChampDropDownOptions({ isVisible, handler }) {
   }
   return null;
 }
-
-TypeDeChampDropDownOptions.propTypes = {
-  isVisible: PropTypes.bool,
-  value: PropTypes.string,
-  handler: PropTypes.object
-};
-
-export default TypeDeChampDropDownOptions;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.tsx
similarity index 67%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.tsx
index 85bcda3c0..fd341e4d2 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownOther.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function TypeDeChampDropDownOther({ isVisible, handler }) {
+import type { Handler } from '../types';
+
+export function TypeDeChampDropDownOther({
+  isVisible,
+  handler
+}: {
+  isVisible: boolean;
+  handler: Handler<HTMLInputElement>;
+}) {
   if (isVisible) {
     return (
       <div className="cell">
@@ -21,10 +28,3 @@ function TypeDeChampDropDownOther({ isVisible, handler }) {
   }
   return null;
 }
-
-TypeDeChampDropDownOther.propTypes = {
-  isVisible: PropTypes.bool,
-  handler: PropTypes.object
-};
-
-export default TypeDeChampDropDownOther;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.tsx
similarity index 78%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.tsx
index 6f1ee62f8..7d7db72fb 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampDropDownSecondary.tsx
@@ -1,10 +1,15 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-export default function TypeDeChampDropDownSecondary({
+import type { Handler } from '../types';
+
+export function TypeDeChampDropDownSecondary({
   isVisible,
   libelleHandler,
   descriptionHandler
+}: {
+  isVisible: boolean;
+  libelleHandler: Handler<HTMLInputElement>;
+  descriptionHandler: Handler<HTMLTextAreaElement>;
 }) {
   if (isVisible) {
     return (
@@ -33,9 +38,3 @@ export default function TypeDeChampDropDownSecondary({
   }
   return null;
 }
-
-TypeDeChampDropDownSecondary.propTypes = {
-  isVisible: PropTypes.bool,
-  libelleHandler: PropTypes.object,
-  descriptionHandler: PropTypes.object
-};
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.tsx
similarity index 59%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.tsx
index 0289bce4d..1fe1e7e49 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampPieceJustificative.tsx
@@ -1,13 +1,20 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-import Uploader from '../../../shared/activestorage/uploader';
+import React, { ChangeEvent } from 'react';
 
-function TypeDeChampPieceJustificative({
+import Uploader from '../../../shared/activestorage/uploader';
+import type { Handler } from '../types';
+
+export function TypeDeChampPieceJustificative({
   isVisible,
   url,
   filename,
   handler,
   directUploadUrl
+}: {
+  isVisible: boolean;
+  url?: string;
+  filename?: string;
+  handler: Handler<HTMLInputElement>;
+  directUploadUrl: string;
 }) {
   if (isVisible) {
     const hasFile = !!filename;
@@ -28,15 +35,15 @@ function TypeDeChampPieceJustificative({
   return null;
 }
 
-TypeDeChampPieceJustificative.propTypes = {
-  isVisible: PropTypes.bool,
-  url: PropTypes.string,
-  filename: PropTypes.string,
-  handler: PropTypes.object,
-  directUploadUrl: PropTypes.string
-};
-
-function FileInformation({ isVisible, url, filename }) {
+function FileInformation({
+  isVisible,
+  url,
+  filename
+}: {
+  isVisible: boolean;
+  url?: string;
+  filename?: string;
+}) {
   if (isVisible) {
     return (
       <>
@@ -50,32 +57,29 @@ function FileInformation({ isVisible, url, filename }) {
   return null;
 }
 
-FileInformation.propTypes = {
-  isVisible: PropTypes.bool,
-  url: PropTypes.string,
-  filename: PropTypes.string
-};
-
-function onFileChange(handler, directUploadUrl) {
+function onFileChange(
+  handler: Handler<HTMLInputElement>,
+  directUploadUrl: string
+): (event: ChangeEvent<HTMLInputElement>) => void {
   return async ({ target }) => {
-    const file = target.files[0];
+    const file = (target.files ?? [])[0];
     if (file) {
       const signedId = await uploadFile(target, file, directUploadUrl);
       handler.onChange({
-        target: {
-          value: signedId
-        }
-      });
+        target: { value: signedId }
+      } as ChangeEvent<HTMLInputElement>);
     }
   };
 }
 
-function uploadFile(input, file, directUploadUrl) {
+function uploadFile(
+  input: HTMLInputElement,
+  file: File,
+  directUploadUrl: string
+) {
   const controller = new Uploader(input, file, directUploadUrl);
   return controller.start().then((signedId) => {
-    input.value = null;
+    input.value = '';
     return signedId;
   });
 }
-
-export default TypeDeChampPieceJustificative;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.tsx
similarity index 81%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.tsx
index 1b8497ff3..154ce2a71 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampRepetitionOptions.tsx
@@ -1,15 +1,19 @@
 import React, { useReducer } from 'react';
-import PropTypes from 'prop-types';
 import { PlusIcon } from '@heroicons/react/outline';
 
 import { SortableContainer, addChampLabel } from '../utils';
-import TypeDeChamp from './TypeDeChamp';
+import { TypeDeChampComponent } from './TypeDeChamp';
 import typeDeChampsReducer from '../typeDeChampsReducer';
+import type { State, TypeDeChamp } from '../types';
 
-function TypeDeChampRepetitionOptions({
+export function TypeDeChampRepetitionOptions({
   isVisible,
   state: parentState,
   typeDeChamp
+}: {
+  isVisible: boolean;
+  state: State;
+  typeDeChamp: TypeDeChamp;
 }) {
   const [state, dispatch] = useReducer(typeDeChampsReducer, parentState);
 
@@ -23,7 +27,7 @@ function TypeDeChampRepetitionOptions({
           useDragHandle
         >
           {state.typeDeChamps.map((typeDeChamp, index) => (
-            <TypeDeChamp
+            <TypeDeChampComponent
               dispatch={dispatch}
               idx={index}
               index={index}
@@ -54,11 +58,3 @@ function TypeDeChampRepetitionOptions({
   }
   return null;
 }
-
-TypeDeChampRepetitionOptions.propTypes = {
-  isVisible: PropTypes.bool,
-  state: PropTypes.object,
-  typeDeChamp: PropTypes.object
-};
-
-export default TypeDeChampRepetitionOptions;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.tsx
similarity index 64%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.tsx
index 1c53a220e..010ec76ac 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChampTypesSelect.tsx
@@ -1,7 +1,14 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
-function TypeDeChampTypesSelect({ handler, options }) {
+import type { Handler } from '../types';
+
+export function TypeDeChampTypesSelect({
+  handler,
+  options
+}: {
+  handler: Handler<HTMLSelectElement>;
+  options: [label: string, type: string][];
+}) {
   return (
     <div className="cell">
       <select
@@ -20,10 +27,3 @@ function TypeDeChampTypesSelect({ handler, options }) {
     </div>
   );
 }
-
-TypeDeChampTypesSelect.propTypes = {
-  handler: PropTypes.object,
-  options: PropTypes.array
-};
-
-export default TypeDeChampTypesSelect;
diff --git a/app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.jsx b/app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.tsx
similarity index 86%
rename from app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.jsx
rename to app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.tsx
index ccd3305d5..8c5bf85ab 100644
--- a/app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.jsx
+++ b/app/javascript/components/TypesDeChampEditor/components/TypeDeChamps.tsx
@@ -1,12 +1,20 @@
 import React, { useReducer } from 'react';
-import PropTypes from 'prop-types';
 import { PlusIcon, ArrowCircleDownIcon } from '@heroicons/react/outline';
 
 import { SortableContainer, addChampLabel } from '../utils';
-import TypeDeChamp from './TypeDeChamp';
+import { TypeDeChampComponent } from './TypeDeChamp';
 import typeDeChampsReducer from '../typeDeChampsReducer';
+import type { TypeDeChamp, State } from '../types';
 
-function TypeDeChamps({ state: rootState, typeDeChamps }) {
+type TypeDeChampsProps = {
+  state: State;
+  typeDeChamps: TypeDeChamp[];
+};
+
+export function TypeDeChamps({
+  state: rootState,
+  typeDeChamps
+}: TypeDeChampsProps) {
   const [state, dispatch] = useReducer(typeDeChampsReducer, {
     ...rootState,
     typeDeChamps
@@ -24,7 +32,7 @@ function TypeDeChamps({ state: rootState, typeDeChamps }) {
         useDragHandle
       >
         {state.typeDeChamps.map((typeDeChamp, index) => (
-          <TypeDeChamp
+          <TypeDeChampComponent
             dispatch={dispatch}
             idx={index}
             index={index}
@@ -67,10 +75,3 @@ function TypeDeChamps({ state: rootState, typeDeChamps }) {
     </div>
   );
 }
-
-TypeDeChamps.propTypes = {
-  state: PropTypes.object,
-  typeDeChamps: PropTypes.array
-};
-
-export default TypeDeChamps;
diff --git a/app/javascript/components/TypesDeChampEditor/index.jsx b/app/javascript/components/TypesDeChampEditor/index.jsx
deleted file mode 100644
index 3b2347b96..000000000
--- a/app/javascript/components/TypesDeChampEditor/index.jsx
+++ /dev/null
@@ -1,46 +0,0 @@
-import React, { Component } from 'react';
-import PropTypes from 'prop-types';
-
-import Flash from './Flash';
-import OperationsQueue from './OperationsQueue';
-import TypeDeChamps from './components/TypeDeChamps';
-
-class TypesDeChampEditor extends Component {
-  constructor(props) {
-    super(props);
-    const defaultTypeDeChampAttributes = {
-      type_champ: 'text',
-      types_de_champ: [],
-      private: props.isAnnotation,
-      libelle: `${
-        props.isAnnotation ? 'Nouvelle annotation' : 'Nouveau champ'
-      } ${props.typeDeChampsTypes[0][0]}`
-    };
-    this.state = {
-      flash: new Flash(props.isAnnotation),
-      queue: new OperationsQueue(props.baseUrl),
-      defaultTypeDeChampAttributes,
-      typeDeChampsTypes: props.typeDeChampsTypes,
-      directUploadUrl: props.directUploadUrl,
-      isAnnotation: props.isAnnotation,
-      continuerUrl: props.continuerUrl
-    };
-  }
-
-  render() {
-    return (
-      <TypeDeChamps state={this.state} typeDeChamps={this.props.typeDeChamps} />
-    );
-  }
-}
-
-TypesDeChampEditor.propTypes = {
-  baseUrl: PropTypes.string,
-  continuerUrl: PropTypes.string,
-  directUploadUrl: PropTypes.string,
-  isAnnotation: PropTypes.bool,
-  typeDeChamps: PropTypes.array,
-  typeDeChampsTypes: PropTypes.array
-};
-
-export default TypesDeChampEditor;
diff --git a/app/javascript/components/TypesDeChampEditor/index.tsx b/app/javascript/components/TypesDeChampEditor/index.tsx
new file mode 100644
index 000000000..8b2ab794a
--- /dev/null
+++ b/app/javascript/components/TypesDeChampEditor/index.tsx
@@ -0,0 +1,54 @@
+import React from 'react';
+
+import { Flash } from './Flash';
+import { OperationsQueue } from './OperationsQueue';
+import { TypeDeChamps } from './components/TypeDeChamps';
+import { TypeDeChamp } from './types';
+
+type TypesDeChampEditorProps = {
+  baseUrl: string;
+  continuerUrl: string;
+  directUploadUrl: string;
+  isAnnotation: boolean;
+  typeDeChamps: TypeDeChamp[];
+  typeDeChampsTypes: [label: string, type: string][];
+};
+
+export type State = Omit<TypesDeChampEditorProps, 'baseUrl'> & {
+  flash: Flash;
+  queue: OperationsQueue;
+  defaultTypeDeChampAttributes: Pick<
+    TypeDeChamp,
+    | 'type_champ'
+    | 'types_de_champ'
+    | 'libelle'
+    | 'private'
+    | 'parent_id'
+    | 'mandatory'
+  >;
+  prefix?: string;
+};
+
+export default function TypesDeChampEditor(props: TypesDeChampEditorProps) {
+  const defaultTypeDeChampAttributes: Omit<TypeDeChamp, 'id'> = {
+    type_champ: 'text',
+    types_de_champ: [],
+    mandatory: false,
+    private: props.isAnnotation,
+    libelle: `${props.isAnnotation ? 'Nouvelle annotation' : 'Nouveau champ'} ${
+      props.typeDeChampsTypes[0][0]
+    }`
+  };
+  const state: State = {
+    flash: new Flash(props.isAnnotation),
+    queue: new OperationsQueue(props.baseUrl),
+    defaultTypeDeChampAttributes,
+    typeDeChamps: [],
+    typeDeChampsTypes: props.typeDeChampsTypes,
+    directUploadUrl: props.directUploadUrl,
+    isAnnotation: props.isAnnotation,
+    continuerUrl: props.continuerUrl
+  };
+
+  return <TypeDeChamps state={state} typeDeChamps={props.typeDeChamps} />;
+}
diff --git a/app/javascript/components/TypesDeChampEditor/operations.js b/app/javascript/components/TypesDeChampEditor/operations.js
deleted file mode 100644
index a2a04116c..000000000
--- a/app/javascript/components/TypesDeChampEditor/operations.js
+++ /dev/null
@@ -1,51 +0,0 @@
-export function createTypeDeChampOperation(typeDeChamp, queue) {
-  return queue
-    .enqueue({
-      path: '',
-      method: 'post',
-      payload: { type_de_champ: typeDeChamp }
-    })
-    .then((data) => {
-      handleResponseData(typeDeChamp, data);
-    });
-}
-
-export function destroyTypeDeChampOperation(typeDeChamp, queue) {
-  return queue.enqueue({
-    path: `/${typeDeChamp.id}`,
-    method: 'delete',
-    payload: {}
-  });
-}
-
-export function moveTypeDeChampOperation(typeDeChamp, index, queue) {
-  return queue.enqueue({
-    path: `/${typeDeChamp.id}/move`,
-    method: 'patch',
-    payload: { position: index }
-  });
-}
-
-export function updateTypeDeChampOperation(typeDeChamp, queue) {
-  return queue
-    .enqueue({
-      path: `/${typeDeChamp.id}`,
-      method: 'patch',
-      payload: { type_de_champ: typeDeChamp }
-    })
-    .then((data) => {
-      handleResponseData(typeDeChamp, data);
-    });
-}
-
-function handleResponseData(typeDeChamp, { type_de_champ }) {
-  for (let field of RESPONSE_FIELDS) {
-    typeDeChamp[field] = type_de_champ[field];
-  }
-}
-
-const RESPONSE_FIELDS = [
-  'id',
-  'piece_justificative_template_filename',
-  'piece_justificative_template_url'
-];
diff --git a/app/javascript/components/TypesDeChampEditor/operations.ts b/app/javascript/components/TypesDeChampEditor/operations.ts
new file mode 100644
index 000000000..3fbcdff18
--- /dev/null
+++ b/app/javascript/components/TypesDeChampEditor/operations.ts
@@ -0,0 +1,71 @@
+import type { TypeDeChamp, OperationsQueue } from './types';
+
+export function createTypeDeChampOperation(
+  typeDeChamp: Omit<TypeDeChamp, 'id'>,
+  queue: OperationsQueue
+) {
+  return queue
+    .enqueue({
+      path: '',
+      method: 'post',
+      payload: { type_de_champ: typeDeChamp }
+    })
+    .then((data) => {
+      handleResponseData(typeDeChamp, data as ResponseData);
+    });
+}
+
+export function destroyTypeDeChampOperation(
+  typeDeChamp: TypeDeChamp,
+  queue: OperationsQueue
+) {
+  return queue.enqueue({
+    path: `/${typeDeChamp.id}`,
+    method: 'delete',
+    payload: {}
+  });
+}
+
+export function moveTypeDeChampOperation(
+  typeDeChamp: TypeDeChamp,
+  index: number,
+  queue: OperationsQueue
+) {
+  return queue.enqueue({
+    path: `/${typeDeChamp.id}/move`,
+    method: 'patch',
+    payload: { position: index }
+  });
+}
+
+export function updateTypeDeChampOperation(
+  typeDeChamp: TypeDeChamp,
+  queue: OperationsQueue
+) {
+  return queue
+    .enqueue({
+      path: `/${typeDeChamp.id}`,
+      method: 'patch',
+      payload: { type_de_champ: typeDeChamp }
+    })
+    .then((data) => {
+      handleResponseData(typeDeChamp, data as ResponseData);
+    });
+}
+
+type ResponseData = { type_de_champ: Record<string, string> };
+
+function handleResponseData(
+  typeDeChamp: Partial<TypeDeChamp>,
+  { type_de_champ }: ResponseData
+) {
+  for (const field of RESPONSE_FIELDS) {
+    typeDeChamp[field] = type_de_champ[field];
+  }
+}
+
+const RESPONSE_FIELDS = [
+  'id',
+  'piece_justificative_template_filename',
+  'piece_justificative_template_url'
+] as const;
diff --git a/app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.js b/app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.ts
similarity index 55%
rename from app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.js
rename to app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.ts
index 81125b54a..283dddc86 100644
--- a/app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.js
+++ b/app/javascript/components/TypesDeChampEditor/typeDeChampsReducer.ts
@@ -5,36 +5,103 @@ import {
   moveTypeDeChampOperation,
   updateTypeDeChampOperation
 } from './operations';
+import type { TypeDeChamp, State, Flash, OperationsQueue } from './types';
 
-export default function typeDeChampsReducer(state, { type, params, done }) {
-  switch (type) {
+type AddNewTypeDeChampAction = {
+  type: 'addNewTypeDeChamp';
+  done: () => void;
+};
+
+type AddNewRepetitionTypeDeChampAction = {
+  type: 'addNewRepetitionTypeDeChamp';
+  params: { typeDeChamp: TypeDeChamp };
+  done: () => void;
+};
+
+type UpdateTypeDeChampAction = {
+  type: 'updateTypeDeChamp';
+  params: {
+    typeDeChamp: TypeDeChamp;
+    field: keyof TypeDeChamp;
+    value: string | boolean;
+  };
+  done: () => void;
+};
+
+type RemoveTypeDeChampAction = {
+  type: 'removeTypeDeChamp';
+  params: { typeDeChamp: TypeDeChamp };
+};
+
+type MoveTypeDeChampUpAction = {
+  type: 'moveTypeDeChampUp';
+  params: { typeDeChamp: TypeDeChamp };
+};
+
+type MoveTypeDeChampDownAction = {
+  type: 'moveTypeDeChampDown';
+  params: { typeDeChamp: TypeDeChamp };
+};
+
+type OnSortTypeDeChampsAction = {
+  type: 'onSortTypeDeChamps';
+  params: { oldIndex: number; newIndex: number };
+};
+
+type RefreshAction = {
+  type: 'refresh';
+};
+
+export type Action =
+  | AddNewTypeDeChampAction
+  | AddNewRepetitionTypeDeChampAction
+  | UpdateTypeDeChampAction
+  | RemoveTypeDeChampAction
+  | MoveTypeDeChampUpAction
+  | MoveTypeDeChampDownAction
+  | OnSortTypeDeChampsAction
+  | RefreshAction;
+
+export default function typeDeChampsReducer(
+  state: State,
+  action: Action
+): State {
+  switch (action.type) {
     case 'addNewTypeDeChamp':
-      return addNewTypeDeChamp(state, state.typeDeChamps, done);
+      return addNewTypeDeChamp(state, state.typeDeChamps, action.done);
     case 'addNewRepetitionTypeDeChamp':
       return addNewRepetitionTypeDeChamp(
         state,
         state.typeDeChamps,
-        params.typeDeChamp,
-        done
+        action.params,
+        action.done
       );
     case 'updateTypeDeChamp':
-      return updateTypeDeChamp(state, state.typeDeChamps, params, done);
+      return updateTypeDeChamp(
+        state,
+        state.typeDeChamps,
+        action.params,
+        action.done
+      );
     case 'removeTypeDeChamp':
-      return removeTypeDeChamp(state, state.typeDeChamps, params);
+      return removeTypeDeChamp(state, state.typeDeChamps, action.params);
     case 'moveTypeDeChampUp':
-      return moveTypeDeChampUp(state, state.typeDeChamps, params);
+      return moveTypeDeChampUp(state, state.typeDeChamps, action.params);
     case 'moveTypeDeChampDown':
-      return moveTypeDeChampDown(state, state.typeDeChamps, params);
+      return moveTypeDeChampDown(state, state.typeDeChamps, action.params);
     case 'onSortTypeDeChamps':
-      return onSortTypeDeChamps(state, state.typeDeChamps, params);
+      return onSortTypeDeChamps(state, state.typeDeChamps, action.params);
     case 'refresh':
       return { ...state, typeDeChamps: [...state.typeDeChamps] };
-    default:
-      throw new Error(`Unknown action "${type}"`);
   }
 }
 
-function addTypeDeChamp(state, typeDeChamps, insertAfter, done) {
+function addTypeDeChamp(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  insertAfter: { index: number; target: HTMLDivElement } | null,
+  done: () => void
+) {
   const typeDeChamp = {
     ...state.defaultTypeDeChampAttributes
   };
@@ -44,7 +111,7 @@ function addTypeDeChamp(state, typeDeChamps, insertAfter, done) {
       if (insertAfter) {
         // Move the champ to the correct position server-side
         await moveTypeDeChampOperation(
-          typeDeChamp,
+          typeDeChamp as TypeDeChamp,
           insertAfter.index,
           state.queue
         );
@@ -52,7 +119,7 @@ function addTypeDeChamp(state, typeDeChamps, insertAfter, done) {
       state.flash.success();
       done();
       if (insertAfter) {
-        insertAfter.target.nextElementSibling.scrollIntoView({
+        insertAfter.target.nextElementSibling?.scrollIntoView({
           behavior: 'smooth',
           block: 'start',
           inline: 'nearest'
@@ -61,7 +128,10 @@ function addTypeDeChamp(state, typeDeChamps, insertAfter, done) {
     })
     .catch((message) => state.flash.error(message));
 
-  let newTypeDeChamps = [...typeDeChamps, typeDeChamp];
+  let newTypeDeChamps: TypeDeChamp[] = [
+    ...typeDeChamps,
+    typeDeChamp as TypeDeChamp
+  ];
   if (insertAfter) {
     // Move the champ to the correct position client-side
     newTypeDeChamps = arrayMove(
@@ -77,11 +147,20 @@ function addTypeDeChamp(state, typeDeChamps, insertAfter, done) {
   };
 }
 
-function addNewTypeDeChamp(state, typeDeChamps, done) {
+function addNewTypeDeChamp(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  done: () => void
+) {
   return addTypeDeChamp(state, typeDeChamps, findItemToInsertAfter(), done);
 }
 
-function addNewRepetitionTypeDeChamp(state, typeDeChamps, typeDeChamp, done) {
+function addNewRepetitionTypeDeChamp(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { typeDeChamp }: AddNewRepetitionTypeDeChampAction['params'],
+  done: () => void
+) {
   return addTypeDeChamp(
     {
       ...state,
@@ -97,10 +176,10 @@ function addNewRepetitionTypeDeChamp(state, typeDeChamps, typeDeChamp, done) {
 }
 
 function updateTypeDeChamp(
-  state,
-  typeDeChamps,
-  { typeDeChamp, field, value },
-  done
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { typeDeChamp, field, value }: UpdateTypeDeChampAction['params'],
+  done: () => void
 ) {
   if (field == 'type_champ' && !typeDeChamp.drop_down_list_value) {
     switch (value) {
@@ -117,9 +196,9 @@ function updateTypeDeChamp(
   if (field.startsWith('options.')) {
     const [, optionsField] = field.split('.');
     typeDeChamp.editable_options = typeDeChamp.editable_options || {};
-    typeDeChamp.editable_options[optionsField] = value;
+    typeDeChamp.editable_options[optionsField] = value as string;
   } else {
-    typeDeChamp[field] = value;
+    Object.assign(typeDeChamp, { [field]: value });
   }
 
   getUpdateHandler(typeDeChamp, state)(done);
@@ -130,7 +209,11 @@ function updateTypeDeChamp(
   };
 }
 
-function removeTypeDeChamp(state, typeDeChamps, { typeDeChamp }) {
+function removeTypeDeChamp(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { typeDeChamp }: RemoveTypeDeChampAction['params']
+) {
   destroyTypeDeChampOperation(typeDeChamp, state.queue)
     .then(() => state.flash.success())
     .catch((message) => state.flash.error(message));
@@ -141,7 +224,11 @@ function removeTypeDeChamp(state, typeDeChamps, { typeDeChamp }) {
   };
 }
 
-function moveTypeDeChampUp(state, typeDeChamps, { typeDeChamp }) {
+function moveTypeDeChampUp(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { typeDeChamp }: MoveTypeDeChampUpAction['params']
+) {
   const oldIndex = typeDeChamps.indexOf(typeDeChamp);
   const newIndex = oldIndex - 1;
 
@@ -155,7 +242,11 @@ function moveTypeDeChampUp(state, typeDeChamps, { typeDeChamp }) {
   };
 }
 
-function moveTypeDeChampDown(state, typeDeChamps, { typeDeChamp }) {
+function moveTypeDeChampDown(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { typeDeChamp }: MoveTypeDeChampDownAction['params']
+) {
   const oldIndex = typeDeChamps.indexOf(typeDeChamp);
   const newIndex = oldIndex + 1;
 
@@ -169,7 +260,11 @@ function moveTypeDeChampDown(state, typeDeChamps, { typeDeChamp }) {
   };
 }
 
-function onSortTypeDeChamps(state, typeDeChamps, { oldIndex, newIndex }) {
+function onSortTypeDeChamps(
+  state: State,
+  typeDeChamps: TypeDeChamp[],
+  { oldIndex, newIndex }: OnSortTypeDeChampsAction['params']
+) {
   moveTypeDeChampOperation(typeDeChamps[oldIndex], newIndex, state.queue)
     .then(() => state.flash.success())
     .catch((message) => state.flash.error(message));
@@ -180,24 +275,27 @@ function onSortTypeDeChamps(state, typeDeChamps, { oldIndex, newIndex }) {
   };
 }
 
-function arrayRemove(array, item) {
+function arrayRemove<T>(array: T[], item: T) {
   array = Array.from(array);
   array.splice(array.indexOf(item), 1);
   return array;
 }
 
-function arrayMove(array, from, to) {
+function arrayMove<T>(array: T[], from: number, to: number) {
   array = Array.from(array);
   array.splice(to < 0 ? array.length + to : to, 0, array.splice(from, 1)[0]);
   return array;
 }
 
 const updateHandlers = new WeakMap();
-function getUpdateHandler(typeDeChamp, { queue, flash }) {
+function getUpdateHandler(
+  typeDeChamp: TypeDeChamp,
+  { queue, flash }: { queue: OperationsQueue; flash: Flash }
+) {
   let handler = updateHandlers.get(typeDeChamp);
   if (!handler) {
     handler = debounce(
-      (done) =>
+      (done: () => void) =>
         updateTypeDeChampOperation(typeDeChamp, queue)
           .then(() => {
             flash.success();
@@ -217,7 +315,7 @@ function findItemToInsertAfter() {
   if (target) {
     return {
       target,
-      index: parseInt(target.dataset.index) + 1
+      index: parseInt(target.dataset.index ?? '0') + 1
     };
   } else {
     return null;
@@ -225,11 +323,12 @@ function findItemToInsertAfter() {
 }
 
 function getLastVisibleTypeDeChamp() {
-  const typeDeChamps = document.querySelectorAll('[data-in-view]');
+  const typeDeChamps =
+    document.querySelectorAll<HTMLDivElement>('[data-in-view]');
   const target = typeDeChamps[typeDeChamps.length - 1];
 
   if (target) {
-    const parentTarget = target.closest('[data-repetition]');
+    const parentTarget = target.closest<HTMLDivElement>('[data-repetition]');
     if (parentTarget) {
       return parentTarget;
     }
diff --git a/app/javascript/components/TypesDeChampEditor/types.ts b/app/javascript/components/TypesDeChampEditor/types.ts
new file mode 100644
index 000000000..e0ca1bc16
--- /dev/null
+++ b/app/javascript/components/TypesDeChampEditor/types.ts
@@ -0,0 +1,27 @@
+import type { ChangeEventHandler } from 'react';
+
+export type { Flash } from './Flash';
+export type { OperationsQueue } from './OperationsQueue';
+export type { State } from '.';
+export { Action } from './typeDeChampsReducer';
+
+export type TypeDeChamp = {
+  id: string;
+  libelle: string;
+  type_champ: string;
+  private: boolean;
+  mandatory: boolean;
+  types_de_champ: TypeDeChamp[];
+  parent_id?: string;
+  piece_justificative_template_filename?: string;
+  piece_justificative_template_url?: string;
+  drop_down_list_value?: string;
+  editable_options?: Record<string, string>;
+};
+
+export type Handler<Element extends HTMLElement> = {
+  id: string;
+  name: string;
+  value: string;
+  onChange: ChangeEventHandler<Element>;
+};
diff --git a/app/javascript/components/TypesDeChampEditor/utils.jsx b/app/javascript/components/TypesDeChampEditor/utils.jsx
deleted file mode 100644
index f2f5932ad..000000000
--- a/app/javascript/components/TypesDeChampEditor/utils.jsx
+++ /dev/null
@@ -1,14 +0,0 @@
-import React from 'react';
-import { sortableContainer } from 'react-sortable-hoc';
-
-export const SortableContainer = sortableContainer(({ children }) => {
-  return <ul>{children}</ul>;
-});
-
-export function addChampLabel(isAnnotation) {
-  if (isAnnotation) {
-    return 'Ajouter une annotation';
-  } else {
-    return 'Ajouter un champ';
-  }
-}
diff --git a/app/javascript/components/TypesDeChampEditor/utils.tsx b/app/javascript/components/TypesDeChampEditor/utils.tsx
new file mode 100644
index 000000000..46cf0c97d
--- /dev/null
+++ b/app/javascript/components/TypesDeChampEditor/utils.tsx
@@ -0,0 +1,16 @@
+import React, { ReactNode } from 'react';
+import { SortableContainer as SortableContainerWrapper } from 'react-sortable-hoc';
+
+export const SortableContainer = SortableContainerWrapper(
+  ({ children }: { children: ReactNode }) => {
+    return <ul>{children}</ul>;
+  }
+);
+
+export function addChampLabel(isAnnotation: boolean) {
+  if (isAnnotation) {
+    return 'Ajouter une annotation';
+  } else {
+    return 'Ajouter un champ';
+  }
+}
diff --git a/app/javascript/shared/activestorage/file-upload-error.js b/app/javascript/shared/activestorage/file-upload-error.ts
similarity index 84%
rename from app/javascript/shared/activestorage/file-upload-error.js
rename to app/javascript/shared/activestorage/file-upload-error.ts
index ef4aa5ded..7265ee67e 100644
--- a/app/javascript/shared/activestorage/file-upload-error.js
+++ b/app/javascript/shared/activestorage/file-upload-error.ts
@@ -18,7 +18,10 @@ export const FAILURE_CONNECTIVITY = 'file-upload-failure-connectivity';
   Represent an error during a file upload.
   */
 export default class FileUploadError extends Error {
-  constructor(message, status, code) {
+  status?: number;
+  code?: string;
+
+  constructor(message: string, status: number | undefined, code?: string) {
     super(message);
 
     this.name = 'FileUploadError';
@@ -27,9 +30,9 @@ export default class FileUploadError extends Error {
 
     // Prevent the constructor stacktrace from being included.
     // (it messes up with Sentry issues grouping)
-    if (Error.captureStackTrace) {
+    if ('captureStackTrace' in Error) {
       // V8-only
-      Error.captureStackTrace(this, this.constructor);
+      //Error.captureStackTrace(this, this.constructor);
     } else {
       this.stack = new Error().stack;
     }
@@ -40,7 +43,7 @@ export default class FileUploadError extends Error {
     See FAILURE_* constants for values.
     */
   get failureReason() {
-    let isNetworkError = this.code && this.code != ERROR_CODE_READ;
+    const isNetworkError = this.code && this.code != ERROR_CODE_READ;
 
     if (isNetworkError && this.status != 0) {
       return FAILURE_SERVER;
@@ -60,9 +63,9 @@ export default class FileUploadError extends Error {
 // 2. Create each kind of error on a different line
 //   (so that Sentry knows they are different kind of errors, from
 //   the line they were created.)
-export function errorFromDirectUploadMessage(message) {
-  let matches = message.match(/ Status: ([0-9]{1,3})/);
-  let status = matches ? parseInt(matches[1], 10) : undefined;
+export function errorFromDirectUploadMessage(message: string) {
+  const matches = message.match(/ Status: ([0-9]{1,3})/);
+  const status = matches ? parseInt(matches[1], 10) : undefined;
 
   // prettier-ignore
   if (message.includes('Error reading')) {
diff --git a/app/javascript/shared/activestorage/progress-bar.js b/app/javascript/shared/activestorage/progress-bar.ts
similarity index 63%
rename from app/javascript/shared/activestorage/progress-bar.js
rename to app/javascript/shared/activestorage/progress-bar.ts
index 5c9d6625c..7541ffae4 100644
--- a/app/javascript/shared/activestorage/progress-bar.js
+++ b/app/javascript/shared/activestorage/progress-bar.ts
@@ -15,13 +15,13 @@ const COMPLETE_CLASS = 'direct-upload--complete';
   be found.
   */
 export default class ProgressBar {
-  static init(input, id, file) {
+  static init(input: HTMLInputElement, id: string, file: File) {
     clearErrors(input);
     const html = this.render(id, file.name);
     input.insertAdjacentHTML('beforebegin', html);
   }
 
-  static start(id) {
+  static start(id: string) {
     const element = getDirectUploadElement(id);
     if (element) {
       element.classList.remove(PENDING_CLASS);
@@ -29,15 +29,15 @@ export default class ProgressBar {
     }
   }
 
-  static progress(id, progress) {
+  static progress(id: string, progress: number) {
     const element = getDirectUploadProgressElement(id);
     if (element) {
       element.style.width = `${progress}%`;
-      element.setAttribute('aria-valuenow', progress);
+      element.setAttribute('aria-valuenow', `${progress}`);
     }
   }
 
-  static error(id, error) {
+  static error(id: string, error: string) {
     const element = getDirectUploadElement(id);
     if (element) {
       element.classList.add(ERROR_CLASS);
@@ -45,60 +45,63 @@ export default class ProgressBar {
     }
   }
 
-  static end(id) {
+  static end(id: string) {
     const element = getDirectUploadElement(id);
     if (element) {
       element.classList.add(COMPLETE_CLASS);
     }
   }
 
-  static render(id, filename) {
+  static render(id: string, filename: string) {
     return `<div id="direct-upload-${id}" class="direct-upload ${PENDING_CLASS}" data-direct-upload-id="${id}">
       <div role="progressbar" aria-valuemin="0" aria-valuemax="100" class="direct-upload__progress" style="width: 0%"></div>
       <span class="direct-upload__filename">${filename}</span>
     </div>`;
   }
 
-  constructor(input, id, file) {
-    this.constructor.init(input, id, file);
+  id: string;
+
+  constructor(input: HTMLInputElement, id: string, file: File) {
+    ProgressBar.init(input, id, file);
     this.id = id;
   }
 
   start() {
-    this.constructor.start(this.id);
+    ProgressBar.start(this.id);
   }
 
-  progress(progress) {
-    this.constructor.progress(this.id, progress);
+  progress(progress: number) {
+    ProgressBar.progress(this.id, progress);
   }
 
-  error(error) {
-    this.constructor.error(this.id, error);
+  error(error: string) {
+    ProgressBar.error(this.id, error);
   }
 
   end() {
-    this.constructor.end(this.id);
+    ProgressBar.end(this.id);
   }
 
   destroy() {
     const element = getDirectUploadElement(this.id);
+    element?.remove();
+  }
+}
+
+function clearErrors(input: HTMLInputElement) {
+  const errorElements =
+    input.parentElement?.querySelectorAll(`.${ERROR_CLASS}`) ?? [];
+  for (const element of errorElements) {
     element.remove();
   }
 }
 
-function clearErrors(input) {
-  const errorElements = input.parentElement.querySelectorAll(`.${ERROR_CLASS}`);
-  for (let element of errorElements) {
-    element.remove();
-  }
+function getDirectUploadElement(id: string) {
+  return document.querySelector<HTMLDivElement>(`#direct-upload-${id}`);
 }
 
-function getDirectUploadElement(id) {
-  return document.getElementById(`direct-upload-${id}`);
-}
-
-function getDirectUploadProgressElement(id) {
-  return document.querySelector(
+function getDirectUploadProgressElement(id: string) {
+  return document.querySelector<HTMLDivElement>(
     `#direct-upload-${id} .direct-upload__progress`
   );
 }
diff --git a/app/javascript/shared/activestorage/uploader.js b/app/javascript/shared/activestorage/uploader.ts
similarity index 70%
rename from app/javascript/shared/activestorage/uploader.js
rename to app/javascript/shared/activestorage/uploader.ts
index d1454acd6..abbe6ac80 100644
--- a/app/javascript/shared/activestorage/uploader.js
+++ b/app/javascript/shared/activestorage/uploader.ts
@@ -11,9 +11,18 @@ import FileUploadError, {
   used to track lifecycle and progress of an upload.
   */
 export default class Uploader {
-  constructor(input, file, directUploadUrl, autoAttachUrl) {
+  directUpload: DirectUpload;
+  progressBar: ProgressBar;
+  autoAttachUrl?: string;
+
+  constructor(
+    input: HTMLInputElement,
+    file: File,
+    directUploadUrl: string,
+    autoAttachUrl?: string
+  ) {
     this.directUpload = new DirectUpload(file, directUploadUrl, this);
-    this.progressBar = new ProgressBar(input, this.directUpload.id, file);
+    this.progressBar = new ProgressBar(input, this.directUpload.id + '', file);
     this.autoAttachUrl = autoAttachUrl;
   }
 
@@ -26,10 +35,10 @@ export default class Uploader {
     this.progressBar.start();
 
     try {
-      let blobSignedId = await this._upload();
+      const blobSignedId = await this._upload();
 
       if (this.autoAttachUrl) {
-        await this._attach(blobSignedId);
+        await this._attach(blobSignedId, this.autoAttachUrl);
         // On response, the attachment HTML fragment will replace the progress bar.
       } else {
         this.progressBar.end();
@@ -38,7 +47,7 @@ export default class Uploader {
 
       return blobSignedId;
     } catch (error) {
-      this.progressBar.error(error.message);
+      this.progressBar.error((error as Error).message);
       throw error;
     }
   }
@@ -47,11 +56,11 @@ export default class Uploader {
     Upload the file using the DirectUpload instance, and return the blob signed_id.
     Throws a FileUploadError on failure.
     */
-  async _upload() {
+  async _upload(): Promise<string> {
     return new Promise((resolve, reject) => {
       this.directUpload.create((errorMsg, attributes) => {
         if (errorMsg) {
-          let error = errorFromDirectUploadMessage(errorMsg);
+          const error = errorFromDirectUploadMessage(errorMsg.message);
           reject(error);
         } else {
           resolve(attributes.signed_id);
@@ -65,9 +74,9 @@ export default class Uploader {
     Throws a FileUploadError on failure (containing the first validation
     error message, if any).
     */
-  async _attach(blobSignedId) {
+  async _attach(blobSignedId: string, autoAttachUrl: string) {
     const attachmentRequest = {
-      url: this.autoAttachUrl,
+      url: autoAttachUrl,
       type: 'PUT',
       data: `blob_signed_id=${blobSignedId}`
     };
@@ -75,23 +84,27 @@ export default class Uploader {
     try {
       await ajax(attachmentRequest);
     } catch (e) {
-      let message = e.response && e.response.errors && e.response.errors[0];
+      const error = e as {
+        response?: { errors: string[] };
+        xhr?: XMLHttpRequest;
+      };
+      const message = error.response?.errors && error.response.errors[0];
       throw new FileUploadError(
         message || 'Error attaching file.',
-        e.xhr.status,
+        error.xhr?.status,
         ERROR_CODE_ATTACH
       );
     }
   }
 
-  uploadRequestDidProgress(event) {
+  uploadRequestDidProgress(event: ProgressEvent) {
     const progress = (event.loaded / event.total) * 100;
     if (progress) {
       this.progressBar.progress(progress);
     }
   }
 
-  directUploadWillStoreFileWithXHR(xhr) {
+  directUploadWillStoreFileWithXHR(xhr: XMLHttpRequest) {
     xhr.upload.addEventListener('progress', (event) =>
       this.uploadRequestDidProgress(event)
     );
diff --git a/package.json b/package.json
index 6a18d8d21..aac8b6af3 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "react-intersection-observer": "^8.31.0",
     "react-popper": "^2.2.5",
     "react-query": "^3.34.19",
-    "react-sortable-hoc": "^1.11.0",
+    "react-sortable-hoc": "^2.0.0",
     "tiny-invariant": "^1.2.0",
     "trix": "^1.2.3",
     "use-debounce": "^5.2.0",
@@ -49,6 +49,7 @@
     "@types/geojson": "^7946.0.8",
     "@types/is-hotkey": "^0.1.7",
     "@types/mapbox__mapbox-gl-draw": "^1.2.3",
+    "@types/rails__activestorage": "^7.0.1",
     "@types/rails__ujs": "^6.0.1",
     "@types/react": "^17.0.43",
     "@types/react-dom": "^17.0.14",
diff --git a/yarn.lock b/yarn.lock
index 199844fa2..31c831f23 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2459,6 +2459,11 @@
   resolved "https://registry.yarnpkg.com/@types/q/-/q-1.5.5.tgz#75a2a8e7d8ab4b230414505d92335d1dcb53a6df"
   integrity sha512-L28j2FcJfSZOnL1WBjDYp2vUHCeIFlyYI/53EwD/rKUBQ7MtUUfbQWiyKJGpcnv4/WgrhWsFKrcPstcAt/J0tQ==
 
+"@types/rails__activestorage@^7.0.1":
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/@types/rails__activestorage/-/rails__activestorage-7.0.1.tgz#7e60320fdb376d34051733e3f8f0df0a8ff24077"
+  integrity sha512-H8mjwqFNweMfvgg8U+rdsonqjouETdqZxEOfzARiA4ag8jtLHFhjfAgFF6gWMnzVpXgQPrJw1boiknx9rV23Eg==
+
 "@types/rails__ujs@^6.0.1":
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/@types/rails__ujs/-/rails__ujs-6.0.1.tgz#83c5aa1dad88ca869de05a9523eff58041ab307a"
@@ -11294,10 +11299,10 @@ react-query@^3.34.19:
     broadcast-channel "^3.4.1"
     match-sorter "^6.0.2"
 
-react-sortable-hoc@^1.11.0:
-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/react-sortable-hoc/-/react-sortable-hoc-1.11.0.tgz#fe4022362bbafc4b836f5104b9676608a40a278f"
-  integrity sha512-v1CDCvdfoR3zLGNp6qsBa4J1BWMEVH25+UKxF/RvQRh+mrB+emqtVHMgZ+WreUiKJoEaiwYoScaueIKhMVBHUg==
+react-sortable-hoc@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/react-sortable-hoc/-/react-sortable-hoc-2.0.0.tgz#f6780d8aa4b922a21f3e754af542f032677078b7"
+  integrity sha512-JZUw7hBsAHXK7PTyErJyI7SopSBFRcFHDjWW5SWjcugY0i6iH7f+eJkY8cJmGMlZ1C9xz1J3Vjz0plFpavVeRg==
   dependencies:
     "@babel/runtime" "^7.2.0"
     invariant "^2.2.4"