diff --git a/generators/angular/generator.ts b/generators/angular/generator.ts
index 5d9dbe57bf4..f04dc0c7198 100644
--- a/generators/angular/generator.ts
+++ b/generators/angular/generator.ts
@@ -94,7 +94,7 @@ export default class AngularGenerator extends BaseApplicationGenerator {
           eslintConfigFile: app => `eslint.config.${app.packageJsonType === 'module' ? 'js' : 'mjs'}`,
           webappEnumerationsDir: app => `${app.clientSrcDir}app/entities/enumerations/`,
           angularLocaleId: app => app.nativeLanguageDefinition.angularLocale ?? defaultLanguage.angularLocale,
-        });
+        } as any);
 
         application.addPrettierExtensions?.(['html', 'css', 'scss']);
       },
diff --git a/generators/bootstrap-application-base/generator.ts b/generators/bootstrap-application-base/generator.ts
index 7d00ff2ac61..6dcafae99f7 100644
--- a/generators/bootstrap-application-base/generator.ts
+++ b/generators/bootstrap-application-base/generator.ts
@@ -165,12 +165,15 @@ export default class BootstrapApplicationBase extends BaseApplicationGenerator {
       prepareApplication({ application, applicationDefaults }) {
         loadDerivedAppConfig({ application });
 
+        applicationDefaults({
+          // TODO drop clientPackageManager
+          clientPackageManager: ({ nodePackageManager }) => nodePackageManager,
+        } as any);
+
         applicationDefaults({
           __override__: false,
           nodePackageManager: 'npm',
           dockerServicesDir: JAVA_DOCKER_DIR,
-          // TODO drop clientPackageManager
-          clientPackageManager: ({ nodePackageManager }) => nodePackageManager,
           hipsterName: 'Java Hipster',
           hipsterProductName: 'JHipster',
           hipsterHomePageProductName: 'JHipster',
@@ -187,7 +190,7 @@ export default class BootstrapApplicationBase extends BaseApplicationGenerator {
 
           backendTypeSpringBoot: ({ backendType }) => backendType === 'Java',
           backendTypeJavaAny: ({ backendTypeSpringBoot }) => backendTypeSpringBoot,
-          clientFrameworkBuiltIn: ({ clientFramework }) => ['angular', 'vue', 'react'].includes(clientFramework),
+          clientFrameworkBuiltIn: ({ clientFramework }) => ['angular', 'vue', 'react'].includes(clientFramework!),
         });
       },
       userRelationship({ applicationDefaults }) {
@@ -196,7 +199,7 @@ export default class BootstrapApplicationBase extends BaseApplicationGenerator {
           anyEntityHasRelationshipWithUser: this.getExistingEntities().some(entity =>
             (entity.definition.relationships ?? []).some(relationship => relationship.otherEntityName.toLowerCase() === 'user'),
           ),
-        });
+        } as any);
       },
       syncUserWithIdp({ application, applicationDefaults }) {
         if (!application.backendTypeSpringBoot) return;
@@ -216,7 +219,7 @@ export default class BootstrapApplicationBase extends BaseApplicationGenerator {
           generateBuiltInUserEntity: ({ generateUserManagement, syncUserWithIdp }) => generateUserManagement || syncUserWithIdp,
           generateBuiltInAuthorityEntity: ({ generateBuiltInUserEntity, databaseType }) =>
             generateBuiltInUserEntity && databaseType !== 'cassandra',
-        });
+        } as any);
       },
     });
   }
diff --git a/generators/bootstrap-application/generator.ts b/generators/bootstrap-application/generator.ts
index b4b40817011..c510969205d 100644
--- a/generators/bootstrap-application/generator.ts
+++ b/generators/bootstrap-application/generator.ts
@@ -86,7 +86,7 @@ export default class BootstrapApplicationGenerator extends BaseApplicationGenera
           useNpmWrapper: application => application.clientFrameworkAny && application.backendTypeJavaAny,
           documentationArchiveUrl: ({ jhipsterVersion }) =>
             `${JHIPSTER_DOCUMENTATION_URL}${JHIPSTER_DOCUMENTATION_ARCHIVE_PATH}v${jhipsterVersion}`,
-        });
+        } as any);
       },
     });
   }
diff --git a/generators/javascript/generators/prettier/generator.ts b/generators/javascript/generators/prettier/generator.ts
index 62c11cd8b36..df1c53a55a5 100644
--- a/generators/javascript/generators/prettier/generator.ts
+++ b/generators/javascript/generators/prettier/generator.ts
@@ -54,7 +54,7 @@ export default class PrettierGenerator extends BaseApplicationGenerator {
         applicationDefaults({
           prettierFolders: ',**/',
           prettierExtensions: 'md,json,yml,js,cjs,mjs,ts,cts,mts',
-        });
+        } as any);
 
         application.addPrettierExtensions = (extensions: string[]) => {
           const currentExtensions = application.prettierExtensions!.split(',');
diff --git a/generators/server/generator.ts b/generators/server/generator.ts
index 03a1fe4a27c..f6819d4e4c3 100644
--- a/generators/server/generator.ts
+++ b/generators/server/generator.ts
@@ -164,7 +164,7 @@ export default class JHipsterServerGenerator extends BaseApplicationGenerator {
           ANGULAR,
           VUE,
           REACT,
-        });
+        } as any);
 
         if (this.projectVersion) {
           application.projectVersion = this.projectVersion;
diff --git a/generators/vue/generator.ts b/generators/vue/generator.ts
index 6c0401cc34d..32fca66eb22 100644
--- a/generators/vue/generator.ts
+++ b/generators/vue/generator.ts
@@ -83,7 +83,7 @@ export default class VueGenerator extends BaseApplicationGenerator {
           eslintConfigFile: app => `eslint.config.${app.packageJsonType === 'module' ? 'js' : 'mjs'}`,
           clientWebappDir: app => `${app.clientSrcDir}app/`,
           webappEnumerationsDir: app => `${app.clientWebappDir}shared/model/enumerations/`,
-        });
+        } as any);
       },
       prepareForTemplates({ application, source }) {
         application.addPrettierExtensions?.(['html', 'vue', 'css', 'scss']);
diff --git a/lib/types/application/tasks.d.ts b/lib/types/application/tasks.d.ts
index f9987a9274a..cd15c6257e5 100644
--- a/lib/types/application/tasks.d.ts
+++ b/lib/types/application/tasks.d.ts
@@ -1,12 +1,12 @@
 import type { Storage } from 'yeoman-generator';
-import type { Merge } from 'type-fest';
+import type { Merge, OmitIndexSignature, Simplify } from 'type-fest';
 import type { Entity as BaseEntity } from '../base/entity.js';
 import type { GetFieldType, GetRelationshipType } from '../utils/entity-utils.ts';
 import type { TaskTypes as BaseTaskTypes, TaskParamWithControl, TaskParamWithSource } from '../base/tasks.js';
 import type { Entity } from './entity.js';
 import type { ApplicationType, BaseApplicationSource } from './application.js';
 
-type ApplicationDefaultsTaskParam = {
+type ApplicationDefaultsTaskParam<E = Entity, A = ApplicationType<E>> = {
   /**
    * Parameter properties accepts:
    * - functions: receives the application and the return value is set at the application property.
@@ -22,7 +22,17 @@ type ApplicationDefaultsTaskParam = {
    *   { prop: ({ prop }) => prop + '-bar', prop2: 'won\'t override' },
    * );
    */
-  applicationDefaults: (...defaults: Record<any, any>[]) => void;
+  applicationDefaults: (
+    ...defaults: Simplify<
+      OmitIndexSignature<{
+        [Key in keyof (Partial<A> & { __override__?: boolean })]?: Key extends '__override__'
+          ? boolean
+          : Key extends keyof A
+            ? A[Key] | ((ctx: A) => A[Key])
+            : never;
+      }>
+    >[]
+  ) => void;
 };
 
 type TaskParamWithApplication<E = Entity, A = ApplicationType<E>> = TaskParamWithControl & {
@@ -35,7 +45,7 @@ type TaskParamWithEntities<E = Entity, A = ApplicationType<E>> = TaskParamWithAp
 
 type TaskParamWithApplicationDefaults<E = Entity, A = ApplicationType<E>> = TaskParamWithControl &
   TaskParamWithApplication<E, A> &
-  ApplicationDefaultsTaskParam;
+  ApplicationDefaultsTaskParam<E, A>;
 
 type PreparingTaskParam<E = Entity, A = ApplicationType<E>> = TaskParamWithApplicationDefaults<E, A> &
   TaskParamWithSource<BaseApplicationSource>;