diff --git a/src/addon/mod/book/components/index/index.ts b/src/addon/mod/book/components/index/index.ts
index 794d4970c..267c0343a 100644
--- a/src/addon/mod/book/components/index/index.ts
+++ b/src/addon/mod/book/components/index/index.ts
@@ -121,7 +121,7 @@ export class AddonModBookIndexComponent extends CoreCourseModuleMainResourceComp
         // Try to get the book data.
         promises.push(this.bookProvider.getBook(this.courseId, this.module.id).then((book) => {
             this.dataRetrieved.emit(book);
-            this.description = book.intro || this.description;
+            this.description = book.intro;
         }).catch(() => {
             // Ignore errors since this WS isn't available in some Moodle versions.
         }));
diff --git a/src/addon/mod/book/providers/book.ts b/src/addon/mod/book/providers/book.ts
index 1e97a6749..d1061ef65 100644
--- a/src/addon/mod/book/providers/book.ts
+++ b/src/addon/mod/book/providers/book.ts
@@ -25,38 +25,7 @@ import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreSite } from '@classes/site';
 import { CoreTagItem } from '@core/tag/providers/tag';
-
-/**
- * A book chapter inside the toc list.
- */
-export interface AddonModBookTocChapter {
-    /**
-     * ID to identify the chapter.
-     */
-    id: string;
-
-    /**
-     * Chapter's title.
-     */
-    title: string;
-
-    /**
-     * The chapter's level.
-     */
-    level: number;
-}
-
-/**
- * Map of book contents. For each chapter it has its index URL and the list of paths of the files the chapter has. Each path
- * is identified by the relative path in the book, and the value is the URL of the file.
- */
-export type AddonModBookContentsMap = {
-    [chapter: string]: {
-        indexUrl?: string,
-        paths: {[path: string]: string},
-        tags?: CoreTagItem[]
-    }
-};
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for books.
@@ -83,7 +52,7 @@ export class AddonModBookProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the book is retrieved.
      */
-    getBook(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getBook(courseId: number, cmId: number, siteId?: string): Promise<AddonModBookBook> {
         return this.getBookByField(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -96,7 +65,7 @@ export class AddonModBookProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the book is retrieved.
      */
-    protected getBookByField(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getBookByField(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModBookBook> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -106,7 +75,9 @@ export class AddonModBookProvider {
                     updateFrequency: CoreSite.FREQUENCY_RARELY
                 };
 
-            return site.read('mod_book_get_books_by_courses', params, preSets).then((response) => {
+            return site.read('mod_book_get_books_by_courses', params, preSets)
+                    .then((response: AddonModBookGetBooksByCoursesResult): any => {
+
                 // Search the book.
                 if (response && response.books) {
                     for (const i in response.books) {
@@ -401,3 +372,66 @@ export class AddonModBookProvider {
                 {chapterid: chapterId}, siteId);
     }
 }
+
+/**
+ * A book chapter inside the toc list.
+ */
+export type AddonModBookTocChapter = {
+    /**
+     * ID to identify the chapter.
+     */
+    id: string;
+
+    /**
+     * Chapter's title.
+     */
+    title: string;
+
+    /**
+     * The chapter's level.
+     */
+    level: number;
+};
+
+/**
+ * Map of book contents. For each chapter it has its index URL and the list of paths of the files the chapter has. Each path
+ * is identified by the relative path in the book, and the value is the URL of the file.
+ */
+export type AddonModBookContentsMap = {
+    [chapter: string]: {
+        indexUrl?: string,
+        paths: {[path: string]: string},
+        tags?: CoreTagItem[]
+    }
+};
+
+/**
+ * Book returned by mod_book_get_books_by_courses.
+ */
+export type AddonModBookBook = {
+    id: number; // Book id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Book name.
+    intro: string; // The Book intro.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles?: CoreWSExternalFile[]; // @since 3.2.
+    numbering: number; // Book numbering configuration.
+    navstyle: number; // Book navigation style configuration.
+    customtitles: number; // Book custom titles type.
+    revision?: number; // Book revision.
+    timecreated?: number; // Time of creation.
+    timemodified?: number; // Time of last modification.
+    section?: number; // Course section id.
+    visible?: boolean; // Visible.
+    groupmode?: number; // Group mode.
+    groupingid?: number; // Group id.
+};
+
+/**
+ * Result of WS mod_book_get_books_by_courses.
+ */
+export type AddonModBookGetBooksByCoursesResult = {
+    books: AddonModBookBook[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/folder/components/index/index.ts b/src/addon/mod/folder/components/index/index.ts
index d23b70e38..dc9b246dd 100644
--- a/src/addon/mod/folder/components/index/index.ts
+++ b/src/addon/mod/folder/components/index/index.ts
@@ -34,6 +34,7 @@ export class AddonModFolderIndexComponent extends CoreCourseModuleMainResourceCo
     component = AddonModFolderProvider.COMPONENT;
     canGetFolder: boolean;
     contents: any;
+    moduleContents: any;
 
     constructor(injector: Injector, private folderProvider: AddonModFolderProvider, private courseProvider: CoreCourseProvider,
             private appProvider: CoreAppProvider, private folderHelper: AddonModFolderHelperProvider) {
@@ -87,9 +88,9 @@ export class AddonModFolderIndexComponent extends CoreCourseModuleMainResourceCo
 
         if (this.path) {
             // Subfolder.
-            this.contents = module.contents;
+            this.contents = this.moduleContents;
         } else {
-            this.contents = this.folderHelper.formatContents(module.contents);
+            this.contents = this.folderHelper.formatContents(this.moduleContents);
         }
     }
 
@@ -105,7 +106,7 @@ export class AddonModFolderIndexComponent extends CoreCourseModuleMainResourceCo
         if (this.canGetFolder) {
             promise = this.folderProvider.getFolder(this.courseId, this.module.id).then((folder) => {
                 return this.courseProvider.loadModuleContents(this.module, this.courseId).then(() => {
-                    folder.contents = this.module.contents;
+                    this.moduleContents = this.module.contents;
 
                     return folder;
                 });
@@ -117,17 +118,13 @@ export class AddonModFolderIndexComponent extends CoreCourseModuleMainResourceCo
                     folder.contents = this.module.contents;
                 }
                 this.module = folder;
+                this.moduleContents = folder.contents;
 
                 return folder;
             });
         }
 
         return promise.then((folder) => {
-            if (folder) {
-                this.description = folder.intro || folder.description;
-                this.dataRetrieved.emit(folder);
-            }
-
             this.showModuleData(folder);
 
             // All data obtained, now fill the context menu.
diff --git a/src/addon/mod/folder/providers/folder.ts b/src/addon/mod/folder/providers/folder.ts
index 989a0c69a..c472ce0f6 100644
--- a/src/addon/mod/folder/providers/folder.ts
+++ b/src/addon/mod/folder/providers/folder.ts
@@ -19,6 +19,7 @@ import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreSite } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for folder.
@@ -43,7 +44,7 @@ export class AddonModFolderProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the book is retrieved.
      */
-    getFolder(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getFolder(courseId: number, cmId: number, siteId?: string): Promise<AddonModFolderFolder> {
         return this.getFolderByKey(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -56,7 +57,7 @@ export class AddonModFolderProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the book is retrieved.
      */
-    protected getFolderByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getFolderByKey(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModFolderFolder> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -66,7 +67,9 @@ export class AddonModFolderProvider {
                     updateFrequency: CoreSite.FREQUENCY_RARELY
                 };
 
-            return site.read('mod_folder_get_folders_by_courses', params, preSets).then((response) => {
+            return site.read('mod_folder_get_folders_by_courses', params, preSets)
+                    .then((response: AddonModFolderGetFoldersByCoursesResult): any => {
+
                 if (response && response.folders) {
                     const currentFolder = response.folders.find((folder) => {
                         return folder[key] == value;
@@ -147,3 +150,33 @@ export class AddonModFolderProvider {
                 {}, siteId);
     }
 }
+
+/**
+ * Folder returned by mod_folder_get_folders_by_courses.
+ */
+export type AddonModFolderFolder = {
+    id: number; // Module id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Page name.
+    intro: string; // Summary.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles: CoreWSExternalFile[];
+    revision: number; // Incremented when after each file changes, to avoid cache.
+    timemodified: number; // Last time the folder was modified.
+    display: number; // Display type of folder contents on a separate page or inline.
+    showexpanded: number; // 1 = expanded, 0 = collapsed for sub-folders.
+    showdownloadfolder: number; // Whether to show the download folder button.
+    section: number; // Course section id.
+    visible: number; // Module visibility.
+    groupmode: number; // Group mode.
+    groupingid: number; // Grouping id.
+};
+
+/**
+ * Result of WS mod_folder_get_folders_by_courses.
+ */
+export type AddonModFolderGetFoldersByCoursesResult = {
+    folders: AddonModFolderFolder[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/imscp/components/index/index.ts b/src/addon/mod/imscp/components/index/index.ts
index 37edb9b87..6940db0d8 100644
--- a/src/addon/mod/imscp/components/index/index.ts
+++ b/src/addon/mod/imscp/components/index/index.ts
@@ -79,7 +79,7 @@ export class AddonModImscpIndexComponent extends CoreCourseModuleMainResourceCom
         const promises = [];
 
         promises.push(this.imscpProvider.getImscp(this.courseId, this.module.id).then((imscp) => {
-            this.description = imscp.intro || imscp.description;
+            this.description = imscp.intro;
             this.dataRetrieved.emit(imscp);
         }));
 
diff --git a/src/addon/mod/imscp/providers/imscp.ts b/src/addon/mod/imscp/providers/imscp.ts
index 366cb7bf6..45adb57f1 100644
--- a/src/addon/mod/imscp/providers/imscp.ts
+++ b/src/addon/mod/imscp/providers/imscp.ts
@@ -21,6 +21,7 @@ import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreSite } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for IMSCP.
@@ -157,7 +158,7 @@ export class AddonModImscpProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the imscp is retrieved.
      */
-    protected getImscpByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getImscpByKey(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModImscpImscp> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                 courseids: [courseId]
@@ -167,7 +168,9 @@ export class AddonModImscpProvider {
                 updateFrequency: CoreSite.FREQUENCY_RARELY
             };
 
-            return site.read('mod_imscp_get_imscps_by_courses', params, preSets).then((response) => {
+            return site.read('mod_imscp_get_imscps_by_courses', params, preSets)
+                    .then((response: AddonModImscpGetImscpsByCoursesResult): any => {
+
                 if (response && response.imscps) {
                     const currentImscp = response.imscps.find((imscp) => imscp[key] == value);
                     if (currentImscp) {
@@ -188,7 +191,7 @@ export class AddonModImscpProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the imscp is retrieved.
      */
-    getImscp(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getImscp(courseId: number, cmId: number, siteId?: string): Promise<AddonModImscpImscp> {
         return this.getImscpByKey(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -324,3 +327,32 @@ export class AddonModImscpProvider {
                 siteId);
     }
 }
+
+/**
+ * IMSCP returned by mod_imscp_get_imscps_by_courses.
+ */
+export type AddonModImscpImscp = {
+    id: number; // IMSCP id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Activity name.
+    intro?: string; // The IMSCP intro.
+    introformat?: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles?: CoreWSExternalFile[]; // @since 3.2.
+    revision?: number; // Revision.
+    keepold?: number; // Number of old IMSCP to keep.
+    structure?: string; // IMSCP structure.
+    timemodified?: string; // Time of last modification.
+    section?: number; // Course section id.
+    visible?: boolean; // If visible.
+    groupmode?: number; // Group mode.
+    groupingid?: number; // Group id.
+};
+
+/**
+ * Result of WS mod_imscp_get_imscps_by_courses.
+ */
+export type AddonModImscpGetImscpsByCoursesResult = {
+    imscps: AddonModImscpImscp[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/label/providers/label.ts b/src/addon/mod/label/providers/label.ts
index ec75856b6..64e3d5c31 100644
--- a/src/addon/mod/label/providers/label.ts
+++ b/src/addon/mod/label/providers/label.ts
@@ -17,6 +17,7 @@ import { CoreSitesProvider } from '@providers/sites';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreSite, CoreSiteWSPreSets } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for labels.
@@ -52,7 +53,7 @@ export class AddonModLabelProvider {
      * @return Promise resolved when the label is retrieved.
      */
     protected getLabelByField(courseId: number, key: string, value: any, forceCache?: boolean, ignoreCache?: boolean,
-            siteId?: string): Promise<any> {
+            siteId?: string): Promise<AddonModLabelLabel> {
 
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
@@ -70,7 +71,9 @@ export class AddonModLabelProvider {
                  preSets.emergencyCache = false;
              }
 
-            return site.read('mod_label_get_labels_by_courses', params, preSets).then((response) => {
+            return site.read('mod_label_get_labels_by_courses', params, preSets)
+                    .then((response: AddonModLabelGetLabelsByCoursesResult): any => {
+
                 if (response && response.labels) {
                     const currentLabel = response.labels.find((label) => label[key] == value);
                     if (currentLabel) {
@@ -93,7 +96,8 @@ export class AddonModLabelProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the label is retrieved.
      */
-    getLabel(courseId: number, cmId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+    getLabel(courseId: number, cmId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string)
+            : Promise<AddonModLabelLabel> {
         return this.getLabelByField(courseId, 'coursemodule', cmId, forceCache, ignoreCache, siteId);
     }
 
@@ -107,7 +111,8 @@ export class AddonModLabelProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the label is retrieved.
      */
-    getLabelById(courseId: number, labelId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+    getLabelById(courseId: number, labelId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string)
+            : Promise<AddonModLabelLabel> {
         return this.getLabelByField(courseId, 'id', labelId, forceCache, ignoreCache, siteId);
     }
 
@@ -170,3 +175,29 @@ export class AddonModLabelProvider {
         return site.wsAvailable('mod_label_get_labels_by_courses');
     }
 }
+
+/**
+ * Label returned by mod_label_get_labels_by_courses.
+ */
+export type AddonModLabelLabel = {
+    id: number; // Module id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Label name.
+    intro: string; // Label contents.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles: CoreWSExternalFile[];
+    timemodified: number; // Last time the label was modified.
+    section: number; // Course section id.
+    visible: number; // Module visibility.
+    groupmode: number; // Group mode.
+    groupingid: number; // Grouping id.
+};
+
+/**
+ * Result of WS mod_label_get_labels_by_courses.
+ */
+export type AddonModLabelGetLabelsByCoursesResult = {
+    labels: AddonModLabelLabel[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/page/components/index/index.ts b/src/addon/mod/page/components/index/index.ts
index bc6b76671..a4297216c 100644
--- a/src/addon/mod/page/components/index/index.ts
+++ b/src/addon/mod/page/components/index/index.ts
@@ -17,7 +17,7 @@ import { CoreAppProvider } from '@providers/app';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseModuleMainResourceComponent } from '@core/course/classes/main-resource-component';
-import { AddonModPageProvider } from '../../providers/page';
+import { AddonModPageProvider, AddonModPagePage } from '../../providers/page';
 import { AddonModPageHelperProvider } from '../../providers/helper';
 import { AddonModPagePrefetchHandler } from '../../providers/prefetch-handler';
 
@@ -34,7 +34,7 @@ export class AddonModPageIndexComponent extends CoreCourseModuleMainResourceComp
     contents: any;
     displayDescription = true;
     displayTimemodified = true;
-    page: any;
+    page: AddonModPagePage;
 
     protected fetchContentDefaultError = 'addon.mod_page.errorwhileloadingthepage';
 
@@ -109,8 +109,8 @@ export class AddonModPageIndexComponent extends CoreCourseModuleMainResourceComp
                         this.page = page;
 
                         // Check if description and timemodified should be displayed.
-                        if (page.displayoptions) {
-                            const options = this.textUtils.unserialize(page.displayoptions) || {};
+                        if (this.page.displayoptions) {
+                            const options = this.textUtils.unserialize(this.page.displayoptions) || {};
                             this.displayDescription = typeof options.printintro == 'undefined' ||
                                     this.utils.isTrueOrOne(options.printintro);
                             this.displayTimemodified = typeof options.printlastmodified == 'undefined' ||
diff --git a/src/addon/mod/page/providers/page.ts b/src/addon/mod/page/providers/page.ts
index ba42a2412..f41739e9a 100644
--- a/src/addon/mod/page/providers/page.ts
+++ b/src/addon/mod/page/providers/page.ts
@@ -20,6 +20,7 @@ import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreSite } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for page.
@@ -43,9 +44,9 @@ export class AddonModPageProvider {
      * @param courseId Course ID.
      * @param cmId Course module ID.
      * @param siteId Site ID. If not defined, current site.
-     * @return Promise resolved when the book is retrieved.
+     * @return Promise resolved when the page is retrieved.
      */
-    getPageData(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getPageData(courseId: number, cmId: number, siteId?: string): Promise<AddonModPagePage> {
         return this.getPageByKey(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -56,9 +57,9 @@ export class AddonModPageProvider {
      * @param key Name of the property to check.
      * @param value Value to search.
      * @param siteId Site ID. If not defined, current site.
-     * @return Promise resolved when the book is retrieved.
+     * @return Promise resolved when the page is retrieved.
      */
-    protected getPageByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getPageByKey(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModPagePage> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -68,7 +69,9 @@ export class AddonModPageProvider {
                     updateFrequency: CoreSite.FREQUENCY_RARELY
                 };
 
-            return site.read('mod_page_get_pages_by_courses', params, preSets).then((response) => {
+            return site.read('mod_page_get_pages_by_courses', params, preSets)
+                    .then((response: AddonModPageGetPagesByCoursesResult): any => {
+
                 if (response && response.pages) {
                     const currentPage = response.pages.find((page) => {
                         return page[key] == value;
@@ -161,3 +164,37 @@ export class AddonModPageProvider {
         return this.logHelper.logSingle('mod_page_view_page', params, AddonModPageProvider.COMPONENT, id, name, 'page', {}, siteId);
     }
 }
+
+/**
+ * Page returned by mod_page_get_pages_by_courses.
+ */
+export type AddonModPagePage = {
+    id: number; // Module id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Page name.
+    intro: string; // Summary.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles: CoreWSExternalFile[];
+    content: string; // Page content.
+    contentformat: number; // Content format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    contentfiles: CoreWSExternalFile[];
+    legacyfiles: number; // Legacy files flag.
+    legacyfileslast: number; // Legacy files last control flag.
+    display: number; // How to display the page.
+    displayoptions: string; // Display options (width, height).
+    revision: number; // Incremented when after each file changes, to avoid cache.
+    timemodified: number; // Last time the page was modified.
+    section: number; // Course section id.
+    visible: number; // Module visibility.
+    groupmode: number; // Group mode.
+    groupingid: number; // Grouping id.
+};
+
+/**
+ * Result of WS mod_page_get_pages_by_courses.
+ */
+export type AddonModPageGetPagesByCoursesResult = {
+    pages: AddonModPagePage[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/resource/providers/module-handler.ts b/src/addon/mod/resource/providers/module-handler.ts
index f4a9888bf..b4c6b1b32 100644
--- a/src/addon/mod/resource/providers/module-handler.ts
+++ b/src/addon/mod/resource/providers/module-handler.ts
@@ -25,6 +25,7 @@ import { CoreTextUtilsProvider } from '@providers/utils/text';
 import { CoreTimeUtilsProvider } from '@providers/utils/time';
 import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
 import { CoreConstants } from '@core/constants';
+import { CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Handler to support resource modules.
@@ -146,7 +147,7 @@ export class AddonModResourceModuleHandler implements CoreCourseModuleHandler {
      */
     protected getResourceData(module: any, courseId: number, handlerData: CoreCourseModuleHandlerData): Promise<any> {
         const promises = [];
-        let infoFiles = [],
+        let infoFiles: CoreWSExternalFile[] = [],
             options: any = {};
 
         // Check if the button needs to be shown or not.
diff --git a/src/addon/mod/resource/providers/resource.ts b/src/addon/mod/resource/providers/resource.ts
index 05c8e4620..19305d71d 100644
--- a/src/addon/mod/resource/providers/resource.ts
+++ b/src/addon/mod/resource/providers/resource.ts
@@ -20,6 +20,7 @@ import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreSite } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for resources.
@@ -56,7 +57,7 @@ export class AddonModResourceProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the resource is retrieved.
      */
-    protected getResourceDataByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getResourceDataByKey(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModResourceResource> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -66,7 +67,9 @@ export class AddonModResourceProvider {
                     updateFrequency: CoreSite.FREQUENCY_RARELY
                 };
 
-            return site.read('mod_resource_get_resources_by_courses', params, preSets).then((response) => {
+            return site.read('mod_resource_get_resources_by_courses', params, preSets)
+                    .then((response: AddonModResourceGetResourcesByCoursesResult): any => {
+
                 if (response && response.resources) {
                     const currentResource = response.resources.find((resource) => {
                         return resource[key] == value;
@@ -89,7 +92,7 @@ export class AddonModResourceProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the resource is retrieved.
      */
-    getResourceData(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getResourceData(courseId: number, cmId: number, siteId?: string): Promise<AddonModResourceResource> {
         return this.getResourceDataByKey(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -165,3 +168,37 @@ export class AddonModResourceProvider {
                 'resource', {}, siteId);
     }
 }
+
+/**
+ * Resource returned by mod_resource_get_resources_by_courses.
+ */
+export type AddonModResourceResource = {
+    id: number; // Module id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // Page name.
+    intro: string; // Summary.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles: CoreWSExternalFile[];
+    contentfiles: CoreWSExternalFile[];
+    tobemigrated: number; // Whether this resource was migrated.
+    legacyfiles: number; // Legacy files flag.
+    legacyfileslast: number; // Legacy files last control flag.
+    display: number; // How to display the resource.
+    displayoptions: string; // Display options (width, height).
+    filterfiles: number; // If filters should be applied to the resource content.
+    revision: number; // Incremented when after each file changes, to avoid cache.
+    timemodified: number; // Last time the resource was modified.
+    section: number; // Course section id.
+    visible: number; // Module visibility.
+    groupmode: number; // Group mode.
+    groupingid: number; // Grouping id.
+};
+
+/**
+ * Result of WS mod_resource_get_resources_by_courses.
+ */
+export type AddonModResourceGetResourcesByCoursesResult = {
+    resources: AddonModResourceResource[];
+    warnings?: CoreWSExternalWarning[];
+};
diff --git a/src/addon/mod/url/providers/module-handler.ts b/src/addon/mod/url/providers/module-handler.ts
index 05f475d59..d1ef86acd 100644
--- a/src/addon/mod/url/providers/module-handler.ts
+++ b/src/addon/mod/url/providers/module-handler.ts
@@ -19,7 +19,7 @@ import { AddonModUrlIndexComponent } from '../components/index/index';
 import { CoreCourseModuleHandler, CoreCourseModuleHandlerData } from '@core/course/providers/module-delegate';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreContentLinksHelperProvider } from '@core/contentlinks/providers/helper';
-import { AddonModUrlProvider } from './url';
+import { AddonModUrlProvider, AddonModUrlUrl } from './url';
 import { AddonModUrlHelperProvider } from './helper';
 import { CoreConstants } from '@core/constants';
 
@@ -90,7 +90,8 @@ export class AddonModUrlModuleHandler implements CoreCourseModuleHandler {
                     if (handler.urlProvider.isGetUrlWSAvailable()) {
                         return handler.urlProvider.getUrl(courseId, module.id).catch(() => {
                             // Ignore errors.
-                        }).then((url) => {
+                            return undefined;
+                        }).then((url: AddonModUrlUrl) => {
                             const displayType = handler.urlProvider.getFinalDisplayType(url);
 
                             return displayType == CoreConstants.RESOURCELIB_DISPLAY_OPEN ||
diff --git a/src/addon/mod/url/providers/url.ts b/src/addon/mod/url/providers/url.ts
index 28ffe8da8..cd8f9e1fe 100644
--- a/src/addon/mod/url/providers/url.ts
+++ b/src/addon/mod/url/providers/url.ts
@@ -21,6 +21,7 @@ import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreConstants } from '@core/constants';
 import { CoreSite } from '@classes/site';
+import { CoreWSExternalWarning, CoreWSExternalFile } from '@providers/ws';
 
 /**
  * Service that provides some features for urls.
@@ -44,7 +45,7 @@ export class AddonModUrlProvider {
      * @param url URL data.
      * @return Final display type.
      */
-    getFinalDisplayType(url: any): number {
+    getFinalDisplayType(url: AddonModUrlUrl): number {
         if (!url) {
             return -1;
         }
@@ -109,7 +110,7 @@ export class AddonModUrlProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the url is retrieved.
      */
-    protected getUrlDataByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getUrlDataByKey(courseId: number, key: string, value: any, siteId?: string): Promise<AddonModUrlUrl> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -119,7 +120,9 @@ export class AddonModUrlProvider {
                     updateFrequency: CoreSite.FREQUENCY_RARELY
                 };
 
-            return site.read('mod_url_get_urls_by_courses', params, preSets).then((response) => {
+            return site.read('mod_url_get_urls_by_courses', params, preSets)
+                    .then((response: AddonModUrlGetUrlsByCoursesResult): any => {
+
                 if (response && response.urls) {
                     const currentUrl = response.urls.find((url) => {
                         return url[key] == value;
@@ -142,7 +145,7 @@ export class AddonModUrlProvider {
      * @param siteId Site ID. If not defined, current site.
      * @return Promise resolved when the url is retrieved.
      */
-    getUrl(courseId: number, cmId: number, siteId?: string): Promise<any> {
+    getUrl(courseId: number, cmId: number, siteId?: string): Promise<AddonModUrlUrl> {
         return this.getUrlDataByKey(courseId, 'coursemodule', cmId, siteId);
     }
 
@@ -231,3 +234,33 @@ export class AddonModUrlProvider {
         return this.logHelper.logSingle('mod_url_view_url', params, AddonModUrlProvider.COMPONENT, id, name, 'url', {}, siteId);
     }
 }
+
+/**
+ * URL returnd by mod_url_get_urls_by_courses.
+ */
+export type AddonModUrlUrl = {
+    id: number; // Module id.
+    coursemodule: number; // Course module id.
+    course: number; // Course id.
+    name: string; // URL name.
+    intro: string; // Summary.
+    introformat: number; // Intro format (1 = HTML, 0 = MOODLE, 2 = PLAIN or 4 = MARKDOWN).
+    introfiles: CoreWSExternalFile[];
+    externalurl: string; // External URL.
+    display: number; // How to display the url.
+    displayoptions: string; // Display options (width, height).
+    parameters: string; // Parameters to append to the URL.
+    timemodified: number; // Last time the url was modified.
+    section: number; // Course section id.
+    visible: number; // Module visibility.
+    groupmode: number; // Group mode.
+    groupingid: number; // Grouping id.
+};
+
+/**
+ * Result of WS mod_url_get_urls_by_courses.
+ */
+export type AddonModUrlGetUrlsByCoursesResult = {
+    urls: AddonModUrlUrl[];
+    warnings?: CoreWSExternalWarning[];
+};