diff --git a/front/.env.example b/front/.env.example
index 02a33b537..e39840f2f 100644
--- a/front/.env.example
+++ b/front/.env.example
@@ -1,4 +1,5 @@
 REACT_APP_SERVER_BASE_URL=http://localhost:3000
+GENERATE_SOURCEMAP=false
 
 # ———————— Optional ————————
 # REACT_APP_SERVER_AUTH_URL=http://localhost:3000/auth
diff --git a/front/package.json b/front/package.json
index 8bd4ec959..224f33ee4 100644
--- a/front/package.json
+++ b/front/package.json
@@ -15,6 +15,7 @@
     "@floating-ui/react": "^0.24.3",
     "@hello-pangea/dnd": "^16.2.0",
     "@hookform/resolvers": "^3.1.1",
+    "@sniptt/guards": "^0.2.0",
     "@tabler/icons-react": "^2.30.0",
     "@tanstack/react-virtual": "^3.0.0-alpha.0",
     "@types/node": "^16.18.4",
diff --git a/front/src/hooks/useCombinedRefs.ts b/front/src/hooks/useCombinedRefs.ts
index 1b2f715f2..525f7a15f 100644
--- a/front/src/hooks/useCombinedRefs.ts
+++ b/front/src/hooks/useCombinedRefs.ts
@@ -1,10 +1,11 @@
 import React, { Ref, RefCallback } from 'react';
+import { isFunction } from '@sniptt/guards';
 
 export const useCombinedRefs =
   <T>(...refs: (Ref<T> | undefined)[]): RefCallback<T> =>
   (node: T) => {
     for (const ref of refs) {
-      if (typeof ref === 'function') {
+      if (isFunction(ref)) {
         ref(node);
       } else if (ref !== null && ref !== undefined) {
         (ref as React.MutableRefObject<T | null>).current = node;
diff --git a/front/src/modules/activities/components/ActivityComments.tsx b/front/src/modules/activities/components/ActivityComments.tsx
index 2a1053327..4c96a5d80 100644
--- a/front/src/modules/activities/components/ActivityComments.tsx
+++ b/front/src/modules/activities/components/ActivityComments.tsx
@@ -1,5 +1,6 @@
 import { getOperationName } from '@apollo/client/utilities';
 import styled from '@emotion/styled';
+import { isNonEmptyString } from '@sniptt/guards';
 import { useRecoilValue } from 'recoil';
 import { v4 } from 'uuid';
 
@@ -10,7 +11,6 @@ import {
 } from '@/ui/input/components/AutosizeTextInput';
 import { useIsMobile } from '@/ui/utilities/responsive/hooks/useIsMobile';
 import { Activity, useCreateCommentMutation } from '~/generated/graphql';
-import { isNonEmptyString } from '~/utils/isNonEmptyString';
 
 import { Comment } from '../comment/Comment';
 import { GET_ACTIVITY } from '../graphql/queries/getActivity';
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldBooleanValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldBooleanValue.ts
index f604c97f4..70dfe4c0c 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldBooleanValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldBooleanValue.ts
@@ -1,9 +1,8 @@
+import { isBoolean } from '@sniptt/guards';
+
 import { FieldBooleanValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldBooleanValue = (
   fieldValue: unknown,
-): fieldValue is FieldBooleanValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'boolean';
+): fieldValue is FieldBooleanValue => isBoolean(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldChipValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldChipValue.ts
index f62b98ed9..1be6f1737 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldChipValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldChipValue.ts
@@ -1,9 +1,8 @@
+import { isString } from '@sniptt/guards';
+
 import { FieldChipValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldChipValue = (
   fieldValue: unknown,
-): fieldValue is FieldChipValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'string';
+): fieldValue is FieldChipValue => isString(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldDateValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldDateValue.ts
index 50400b022..c84f9264b 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldDateValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldDateValue.ts
@@ -1,8 +1,8 @@
+import { isNull, isString } from '@sniptt/guards';
+
 import { FieldDateValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldDateValue = (
   fieldValue: unknown,
-): fieldValue is FieldDateValue =>
-  fieldValue === null ||
-  (fieldValue !== undefined && typeof fieldValue === 'string');
+): fieldValue is FieldDateValue => isNull(fieldValue) || isString(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldEmailValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldEmailValue.ts
index 72ffdd649..0594b8ee4 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldEmailValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldEmailValue.ts
@@ -1,9 +1,8 @@
+import { isString } from '@sniptt/guards';
+
 import { FieldEmailValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldEmailValue = (
   fieldValue: unknown,
-): fieldValue is FieldEmailValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'string';
+): fieldValue is FieldEmailValue => isString(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldMoneyValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldMoneyValue.ts
index 7820c0592..6dad1dae3 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldMoneyValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldMoneyValue.ts
@@ -1,8 +1,8 @@
+import { isNull, isNumber } from '@sniptt/guards';
+
 import { FieldMoneyValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldMoneyValue = (
   fieldValue: unknown,
-): fieldValue is FieldMoneyValue =>
-  fieldValue === null ||
-  (fieldValue !== undefined && typeof fieldValue === 'number');
+): fieldValue is FieldMoneyValue => isNull(fieldValue) || isNumber(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldNumberValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldNumberValue.ts
index 65ae00aa7..4ab45262d 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldNumberValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldNumberValue.ts
@@ -1,8 +1,8 @@
+import { isNull, isNumber } from '@sniptt/guards';
+
 import { FieldNumberValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldNumberValue = (
   fieldValue: unknown,
-): fieldValue is FieldNumberValue =>
-  fieldValue === null ||
-  (fieldValue !== undefined && typeof fieldValue === 'number');
+): fieldValue is FieldNumberValue => isNull(fieldValue) || isNumber(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldPhoneValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldPhoneValue.ts
index e9975573c..e8634d77b 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldPhoneValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldPhoneValue.ts
@@ -1,9 +1,8 @@
+import { isString } from '@sniptt/guards';
+
 import { FieldPhoneValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldPhoneValue = (
   fieldValue: unknown,
-): fieldValue is FieldPhoneValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'string';
+): fieldValue is FieldPhoneValue => isString(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldProbabilityValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldProbabilityValue.ts
index c1e06a319..134a0e9e5 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldProbabilityValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldProbabilityValue.ts
@@ -1,9 +1,8 @@
+import { isNumber } from '@sniptt/guards';
+
 import { FieldProbabilityValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldProbabilityValue = (
   fieldValue: unknown,
-): fieldValue is FieldProbabilityValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'number';
+): fieldValue is FieldProbabilityValue => isNumber(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldRelationValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldRelationValue.ts
index 6a21a855f..4a620bb4d 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldRelationValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldRelationValue.ts
@@ -1,7 +1,9 @@
+import { isObject, isUndefined } from '@sniptt/guards';
+
 import { FieldRelationValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldRelationValue = (
   fieldValue: unknown,
 ): fieldValue is FieldRelationValue =>
-  fieldValue !== undefined && typeof fieldValue === 'object';
+  !isUndefined(fieldValue) && isObject(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldTextValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldTextValue.ts
index 2d5d382db..77efd6973 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldTextValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldTextValue.ts
@@ -1,9 +1,8 @@
+import { isString } from '@sniptt/guards';
+
 import { FieldTextValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldTextValue = (
   fieldValue: unknown,
-): fieldValue is FieldTextValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'string';
+): fieldValue is FieldTextValue => isString(fieldValue);
diff --git a/front/src/modules/ui/data/field/types/guards/isFieldURLValue.ts b/front/src/modules/ui/data/field/types/guards/isFieldURLValue.ts
index 4ad6f0036..a4a50120e 100644
--- a/front/src/modules/ui/data/field/types/guards/isFieldURLValue.ts
+++ b/front/src/modules/ui/data/field/types/guards/isFieldURLValue.ts
@@ -1,9 +1,8 @@
+import { isString } from '@sniptt/guards';
+
 import { FieldURLValue } from '../FieldMetadata';
 
 // TODO: add yup
 export const isFieldURLValue = (
   fieldValue: unknown,
-): fieldValue is FieldURLValue =>
-  fieldValue !== null &&
-  fieldValue !== undefined &&
-  typeof fieldValue === 'string';
+): fieldValue is FieldURLValue => isString(fieldValue);
diff --git a/front/src/modules/ui/display/chip/components/EntityChip.tsx b/front/src/modules/ui/display/chip/components/EntityChip.tsx
index 1d7325925..574be1ba4 100644
--- a/front/src/modules/ui/display/chip/components/EntityChip.tsx
+++ b/front/src/modules/ui/display/chip/components/EntityChip.tsx
@@ -1,10 +1,10 @@
 import * as React from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useTheme } from '@emotion/react';
+import { isNonEmptyString } from '@sniptt/guards';
 
 import { IconComponent } from '@/ui/display/icon/types/IconComponent';
 import { Avatar, AvatarType } from '@/users/components/Avatar';
-import { isNonEmptyString } from '~/utils/isNonEmptyString';
 
 import { Chip, ChipVariant } from './Chip';
 
diff --git a/front/src/modules/ui/input/relation-picker/components/MultipleEntitySelect.tsx b/front/src/modules/ui/input/relation-picker/components/MultipleEntitySelect.tsx
index 382816501..e48af44fc 100644
--- a/front/src/modules/ui/input/relation-picker/components/MultipleEntitySelect.tsx
+++ b/front/src/modules/ui/input/relation-picker/components/MultipleEntitySelect.tsx
@@ -1,4 +1,5 @@
 import { useRef } from 'react';
+import { isNonEmptyString } from '@sniptt/guards';
 import debounce from 'lodash.debounce';
 
 import { DropdownMenu } from '@/ui/layout/dropdown/components/DropdownMenu';
@@ -9,7 +10,6 @@ import { MenuItem } from '@/ui/navigation/menu-item/components/MenuItem';
 import { MenuItemMultiSelectAvatar } from '@/ui/navigation/menu-item/components/MenuItemMultiSelectAvatar';
 import { useListenClickOutside } from '@/ui/utilities/pointer-event/hooks/useListenClickOutside';
 import { Avatar } from '@/users/components/Avatar';
-import { isNonEmptyString } from '~/utils/isNonEmptyString';
 
 import { EntityForSelect } from '../types/EntityForSelect';
 
diff --git a/front/src/modules/ui/input/relation-picker/components/SingleEntitySelectBase.tsx b/front/src/modules/ui/input/relation-picker/components/SingleEntitySelectBase.tsx
index 850b3ac0f..b6e177cb5 100644
--- a/front/src/modules/ui/input/relation-picker/components/SingleEntitySelectBase.tsx
+++ b/front/src/modules/ui/input/relation-picker/components/SingleEntitySelectBase.tsx
@@ -1,4 +1,5 @@
 import { useRef } from 'react';
+import { isNonEmptyString } from '@sniptt/guards';
 import { Key } from 'ts-key-enum';
 
 import { IconPlus } from '@/ui/display/icon';
@@ -11,7 +12,6 @@ import { MenuItemSelectAvatar } from '@/ui/navigation/menu-item/components/MenuI
 import { useScopedHotkeys } from '@/ui/utilities/hotkey/hooks/useScopedHotkeys';
 import { Avatar } from '@/users/components/Avatar';
 import { assertNotNull } from '~/utils/assert';
-import { isNonEmptyString } from '~/utils/isNonEmptyString';
 
 import { CreateButtonId, EmptyButtonId } from '../constants';
 import { useEntitySelectScroll } from '../hooks/useEntitySelectScroll';
diff --git a/front/src/modules/users/components/Avatar.tsx b/front/src/modules/users/components/Avatar.tsx
index 3ee8aca28..96861ecb5 100644
--- a/front/src/modules/users/components/Avatar.tsx
+++ b/front/src/modules/users/components/Avatar.tsx
@@ -1,7 +1,7 @@
 import { useEffect, useState } from 'react';
 import styled from '@emotion/styled';
+import { isNonEmptyString } from '@sniptt/guards';
 
-import { isNonEmptyString } from '~/utils/isNonEmptyString';
 import { stringToHslColor } from '~/utils/string-to-hsl';
 
 import { getImageAbsoluteURIOrBase64 } from '../utils/getProfilePictureAbsoluteURI';
diff --git a/front/src/pages/auth/VerifyEffect.tsx b/front/src/pages/auth/VerifyEffect.tsx
index a8f00eb66..5f97ffbce 100644
--- a/front/src/pages/auth/VerifyEffect.tsx
+++ b/front/src/pages/auth/VerifyEffect.tsx
@@ -1,11 +1,11 @@
 import { useEffect } from 'react';
 import { useNavigate, useSearchParams } from 'react-router-dom';
+import { isNonEmptyString } from '@sniptt/guards';
 
 import { useAuth } from '@/auth/hooks/useAuth';
 import { useIsLogged } from '@/auth/hooks/useIsLogged';
 
 import { AppPath } from '../../modules/types/AppPath';
-import { isNonEmptyString } from '../../utils/isNonEmptyString';
 
 export const VerifyEffect = () => {
   const [searchParams] = useSearchParams();
diff --git a/front/src/pages/impersonate/ImpersonateEffect.tsx b/front/src/pages/impersonate/ImpersonateEffect.tsx
index 3fdb43da3..66c0a8fa8 100644
--- a/front/src/pages/impersonate/ImpersonateEffect.tsx
+++ b/front/src/pages/impersonate/ImpersonateEffect.tsx
@@ -1,5 +1,6 @@
 import { useCallback, useEffect } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';
+import { isNonEmptyString } from '@sniptt/guards';
 import { useRecoilState, useSetRecoilState } from 'recoil';
 
 import { useIsLogged } from '@/auth/hooks/useIsLogged';
@@ -8,7 +9,6 @@ import { tokenPairState } from '@/auth/states/tokenPairState';
 import { useImpersonateMutation } from '~/generated/graphql';
 
 import { AppPath } from '../../modules/types/AppPath';
-import { isNonEmptyString } from '../../utils/isNonEmptyString';
 
 export const ImpersonateEffect = () => {
   const navigate = useNavigate();
diff --git a/front/src/pages/people/__stories__/People.inputs.stories.tsx b/front/src/pages/people/__stories__/People.inputs.stories.tsx
index a74695013..ff6be56fa 100644
--- a/front/src/pages/people/__stories__/People.inputs.stories.tsx
+++ b/front/src/pages/people/__stories__/People.inputs.stories.tsx
@@ -1,4 +1,5 @@
 import { getOperationName } from '@apollo/client/utilities';
+import { isString } from '@sniptt/guards';
 import { expect } from '@storybook/jest';
 import { Meta } from '@storybook/react';
 import { userEvent, within } from '@storybook/testing-library';
@@ -116,7 +117,7 @@ const editRelationMocks = (
 ) => [
   ...graphqlMocks.filter((graphqlMock) => {
     if (
-      typeof graphqlMock.info.operationName === 'string' &&
+      isString(graphqlMock.info.operationName) &&
       [
         getOperationName(UPDATE_ONE_PERSON),
         getOperationName(SEARCH_COMPANY_QUERY),
diff --git a/front/src/testing/decorators/CatalogDecorator.tsx b/front/src/testing/decorators/CatalogDecorator.tsx
index b510c36f9..ab43a7df1 100644
--- a/front/src/testing/decorators/CatalogDecorator.tsx
+++ b/front/src/testing/decorators/CatalogDecorator.tsx
@@ -1,5 +1,6 @@
 import { ComponentProps, JSX } from 'react';
 import styled from '@emotion/styled';
+import { isNumber, isString } from '@sniptt/guards';
 import { Decorator } from '@storybook/react';
 
 const StyledColumnTitle = styled.h1`
@@ -75,6 +76,9 @@ const emptyDimension = {
   props: () => ({}),
 } as CatalogDimension;
 
+const isStringOrNumber = (term: unknown): term is string | number =>
+  isString(term) || isNumber(term);
+
 export type CatalogDimension<
   ComponentType extends React.ElementType = () => JSX.Element,
 > = {
@@ -108,30 +112,26 @@ export const CatalogDecorator: Decorator = (Story, context) => {
         <StyledColumnContainer key={value4}>
           <StyledColumnTitle>
             {dimension4.labels?.(value4) ??
-              (['string', 'number'].includes(typeof value4) ? value4 : '')}
+              (isStringOrNumber(value4) ? value4 : '')}
           </StyledColumnTitle>
           {dimension3.values.map((value3: any) => (
             <StyledRowsContainer key={value3}>
               <StyledRowsTitle>
                 {dimension3.labels?.(value3) ??
-                  (['string', 'number'].includes(typeof value3) ? value3 : '')}
+                  (isStringOrNumber(value3) ? value3 : '')}
               </StyledRowsTitle>
               {dimension2.values.map((value2: any) => (
                 <StyledRowContainer key={value2}>
                   <StyledRowTitle>
                     {dimension2.labels?.(value2) ??
-                      (['string', 'number'].includes(typeof value2)
-                        ? value2
-                        : '')}
+                      (isStringOrNumber(value2) ? value2 : '')}
                   </StyledRowTitle>
                   {dimension1.values.map((value1: any) => {
                     return (
                       <StyledCellContainer key={value1} id={value1}>
                         <StyledElementTitle>
                           {dimension1.labels?.(value1) ??
-                            (['string', 'number'].includes(typeof value1)
-                              ? value1
-                              : '')}
+                            (isStringOrNumber(value1) ? value1 : '')}
                         </StyledElementTitle>
                         <StyledElementContainer
                           width={options?.elementContainer?.width}
diff --git a/front/src/testing/mock-data/index.ts b/front/src/testing/mock-data/index.ts
index 1b2b5eb95..1ab5052e5 100644
--- a/front/src/testing/mock-data/index.ts
+++ b/front/src/testing/mock-data/index.ts
@@ -1,3 +1,4 @@
+import { isObject, isString } from '@sniptt/guards';
 import { GraphQLVariables } from 'msw';
 
 import {
@@ -27,7 +28,7 @@ const filterData = <DataT>(
           const nestedKey = Object.keys(filterElement.is)[0] as string;
           if (
             item[key as keyof typeof item] &&
-            typeof item[key as keyof typeof item] === 'object'
+            isObject(item[key as keyof typeof item])
           ) {
             const nestedItem = item[key as keyof typeof item];
             return (
@@ -116,7 +117,7 @@ export const filterAndSortData = <DataT>(
 
       const sortDirection =
         firstOrderBy[key as unknown as keyof typeof firstOrderBy];
-      if (typeof itemAValue === 'string' && typeof itemBValue === 'string') {
+      if (isString(itemAValue) && isString(itemBValue)) {
         return sortDirection === 'desc'
           ? itemBValue.localeCompare(itemAValue)
           : -itemBValue.localeCompare(itemAValue);
diff --git a/front/src/utils/cast-as-integer-or-null.ts b/front/src/utils/cast-as-integer-or-null.ts
index d5ed76d22..b49655b06 100644
--- a/front/src/utils/cast-as-integer-or-null.ts
+++ b/front/src/utils/cast-as-integer-or-null.ts
@@ -1,3 +1,5 @@
+import { isNull, isNumber, isString } from '@sniptt/guards';
+
 import { logError } from './logError';
 
 const DEBUG_MODE = false;
@@ -11,13 +13,13 @@ export const canBeCastAsIntegerOrNull = (
     return false;
   }
 
-  if (typeof probableNumberOrNull === 'number') {
+  if (isNumber(probableNumberOrNull)) {
     if (DEBUG_MODE) logError('typeof probableNumberOrNull === "number"');
 
     return Number.isInteger(probableNumberOrNull);
   }
 
-  if (probableNumberOrNull === null) {
+  if (isNull(probableNumberOrNull)) {
     if (DEBUG_MODE) logError('probableNumberOrNull === null');
 
     return true;
@@ -29,7 +31,7 @@ export const canBeCastAsIntegerOrNull = (
     return true;
   }
 
-  if (typeof probableNumberOrNull === 'string') {
+  if (isString(probableNumberOrNull)) {
     const stringAsNumber = +probableNumberOrNull;
 
     if (isNaN(stringAsNumber)) {
@@ -54,7 +56,7 @@ export const castAsIntegerOrNull = (
     throw new Error('Cannot cast to number or null');
   }
 
-  if (probableNumberOrNull === null) {
+  if (isNull(probableNumberOrNull)) {
     return null;
   }
 
@@ -62,11 +64,11 @@ export const castAsIntegerOrNull = (
     return null;
   }
 
-  if (typeof probableNumberOrNull === 'number') {
+  if (isNumber(probableNumberOrNull)) {
     return probableNumberOrNull;
   }
 
-  if (typeof probableNumberOrNull === 'string') {
+  if (isString(probableNumberOrNull)) {
     return +probableNumberOrNull;
   }
 
diff --git a/front/src/utils/cast-as-positive-integer-or-null.ts b/front/src/utils/cast-as-positive-integer-or-null.ts
index 1a95db9a5..726596887 100644
--- a/front/src/utils/cast-as-positive-integer-or-null.ts
+++ b/front/src/utils/cast-as-positive-integer-or-null.ts
@@ -1,3 +1,5 @@
+import { isInteger, isNull, isNumber, isString } from '@sniptt/guards';
+
 export const canBeCastAsPositiveIntegerOrNull = (
   probablePositiveNumberOrNull: string | undefined | number | null,
 ): probablePositiveNumberOrNull is number | null => {
@@ -5,14 +7,14 @@ export const canBeCastAsPositiveIntegerOrNull = (
     return false;
   }
 
-  if (typeof probablePositiveNumberOrNull === 'number') {
+  if (isNumber(probablePositiveNumberOrNull)) {
     return (
       Number.isInteger(probablePositiveNumberOrNull) &&
       Math.sign(probablePositiveNumberOrNull) !== -1
     );
   }
 
-  if (probablePositiveNumberOrNull === null) {
+  if (isNull(probablePositiveNumberOrNull)) {
     return true;
   }
 
@@ -20,14 +22,14 @@ export const canBeCastAsPositiveIntegerOrNull = (
     return true;
   }
 
-  if (typeof probablePositiveNumberOrNull === 'string') {
+  if (isString(probablePositiveNumberOrNull)) {
     const stringAsNumber = +probablePositiveNumberOrNull;
 
     if (isNaN(stringAsNumber)) {
       return false;
     }
 
-    if (Number.isInteger(stringAsNumber) && Math.sign(stringAsNumber) !== -1) {
+    if (isInteger(stringAsNumber) && Math.sign(stringAsNumber) !== -1) {
       return true;
     }
   }
@@ -52,11 +54,11 @@ export const castAsPositiveIntegerOrNull = (
     return null;
   }
 
-  if (typeof probablePositiveNumberOrNull === 'number') {
+  if (isNumber(probablePositiveNumberOrNull)) {
     return probablePositiveNumberOrNull;
   }
 
-  if (typeof probablePositiveNumberOrNull === 'string') {
+  if (isString(probablePositiveNumberOrNull)) {
     return +probablePositiveNumberOrNull;
   }
 
diff --git a/front/src/utils/date-utils.ts b/front/src/utils/date-utils.ts
index 9cb5d617f..5b782a0fe 100644
--- a/front/src/utils/date-utils.ts
+++ b/front/src/utils/date-utils.ts
@@ -1,3 +1,4 @@
+import { isDate, isNumber, isString } from '@sniptt/guards';
 import { differenceInCalendarDays, formatDistanceToNow } from 'date-fns';
 import { DateTime } from 'luxon';
 
@@ -10,11 +11,11 @@ export const parseDate = (dateToParse: Date | string | number) => {
 
   if (!dateToParse) {
     throw new Error(`Invalid date passed to formatPastDate: "${dateToParse}"`);
-  } else if (typeof dateToParse === 'string') {
+  } else if (isString(dateToParse)) {
     formattedDate = DateTime.fromISO(dateToParse);
-  } else if (dateToParse instanceof Date) {
+  } else if (isDate(dateToParse)) {
     formattedDate = DateTime.fromJSDate(dateToParse);
-  } else if (typeof dateToParse === 'number') {
+  } else if (isNumber(dateToParse)) {
     formattedDate = DateTime.fromMillis(dateToParse);
   }
 
diff --git a/front/src/utils/isNonEmptyString.ts b/front/src/utils/isNonEmptyString.ts
deleted file mode 100644
index b5b42f151..000000000
--- a/front/src/utils/isNonEmptyString.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { isDefined } from './isDefined';
-
-export const isNonEmptyString = (
-  probableNonEmptyString: string | undefined | null,
-): probableNonEmptyString is string => {
-  if (
-    isDefined(probableNonEmptyString) &&
-    typeof probableNonEmptyString === 'string' &&
-    probableNonEmptyString !== ''
-  ) {
-    return true;
-  }
-
-  return false;
-};
diff --git a/front/yarn.lock b/front/yarn.lock
index 34257458f..7a49f909e 100644
--- a/front/yarn.lock
+++ b/front/yarn.lock
@@ -3922,6 +3922,11 @@
   dependencies:
     "@sinonjs/commons" "^1.7.0"
 
+"@sniptt/guards@^0.2.0":
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/@sniptt/guards/-/guards-0.2.0.tgz#6b95d259bfd77c5db2945605e033cdcfcea97eba"
+  integrity sha512-QNxknl5YcrxpLtP99iEvNEJRlfXtIfpkvcEWHJKD6bHUr93dsH6OZGUF6reVBddKs1ps44lndSMoDK2Dz0n6ZQ==
+
 "@storybook/addon-actions@7.3.0", "@storybook/addon-actions@^7.0.22":
   version "7.3.0"
   resolved "https://registry.yarnpkg.com/@storybook/addon-actions/-/addon-actions-7.3.0.tgz#fb1663a2810918a4147edebc5c7ff056d6ec7e94"