style: fix linting issues met ESLint

backend/src/data/dwengo-entity-repository.ts

@@ -2,7 +2,7 @@ import {EntityRepository, FilterQuery} from '@mikro-orm/core';
 import {EntityAlreadyExistsException} from "../exceptions/entity-already-exists-exception";
 
 export abstract class DwengoEntityRepository<T extends object> extends EntityRepository<T> {
-    public async save(entity: T, options?: {preventOverwrite?: Boolean}): Promise<void> {
+    public async save(entity: T, options?: {preventOverwrite?: boolean}): Promise<void> {
         if (options?.preventOverwrite && await this.findOne(entity)) {
             throw new EntityAlreadyExistsException(`A ${this.getEntityName()} with this identifier already exists.`);
         }

backend/src/mikro-orm.config.ts

@@ -66,7 +66,7 @@ function config(testingMode: boolean = false): Options {
         password: getEnvVar(EnvVars.DbPassword),
         entities: entities,
         persistOnCreate: false, // Entities should not be implicitly persisted when calling create(...), but only after
-                                // they were saved explicitly.
+                                // They were saved explicitly.
         // EntitiesTs: entitiesTs,
 
         // Logging

frontend/src/queries/themes.ts

@@ -4,22 +4,18 @@ import {type MaybeRefOrGetter, toValue} from "vue";
 
 const themeController = getThemeController();
 
-export const useThemeQuery = (language: MaybeRefOrGetter<string>) => {
-    return useQuery({
+export const useThemeQuery = (language: MaybeRefOrGetter<string>) => useQuery({
         queryKey: ['themes', language],
         queryFn: () => {
             const lang = toValue(language);
             return themeController.getAll(lang);
         },
-        enabled: () => !!toValue(language),
+        enabled: () => Boolean(toValue(language)),
     });
-};
 
-export const useThemeHruidsQuery = (themeKey: string | null) => {
-    return useQuery({
+export const useThemeHruidsQuery = (themeKey: string | null) => useQuery({
         queryKey: ['theme-hruids', themeKey],
         queryFn: () => themeController.getHruidsByKey(themeKey!),
-        enabled: !!themeKey,
+        enabled: Boolean(themeKey),
     });
-};