diff --git a/src/lib/components/assets/list/primary-sidebar.svelte b/src/lib/components/assets/list/primary-sidebar.svelte
index 6b14537c..1d7f1919 100644
--- a/src/lib/components/assets/list/primary-sidebar.svelte
+++ b/src/lib/components/assets/list/primary-sidebar.svelte
@@ -10,7 +10,7 @@
     selectedAssetFolder,
   } from '$lib/services/assets';
   import { getFolderLabelByCollection } from '$lib/services/assets/view';
-  import { getCollection } from '$lib/services/contents';
+  import { getCollection } from '$lib/services/contents/collection';
 
   $: folders = [
     {
diff --git a/src/lib/components/assets/shared/info-panel.svelte b/src/lib/components/assets/shared/info-panel.svelte
index f3be0f96..f823359a 100644
--- a/src/lib/components/assets/shared/info-panel.svelte
+++ b/src/lib/components/assets/shared/info-panel.svelte
@@ -6,7 +6,8 @@
   import AssetPreview from '$lib/components/assets/shared/asset-preview.svelte';
   import { goto } from '$lib/services/app/navigation';
   import { getAssetDetails, isMediaKind } from '$lib/services/assets';
-  import { getCollectionsByEntry, getFilesByEntry } from '$lib/services/contents';
+  import { getCollectionsByEntry } from '$lib/services/contents/collection';
+  import { getFilesByEntry } from '$lib/services/contents/collection/files';
   import { getEntryTitle } from '$lib/services/contents/entry';
   import { dateFormatOptions, timeFormatOptions } from '$lib/services/utils/date';
   import { formatSize } from '$lib/services/utils/file';
diff --git a/src/lib/components/assets/shared/select-assets-dialog.svelte b/src/lib/components/assets/shared/select-assets-dialog.svelte
index 0aa01340..09b22981 100644
--- a/src/lib/components/assets/shared/select-assets-dialog.svelte
+++ b/src/lib/components/assets/shared/select-assets-dialog.svelte
@@ -9,7 +9,7 @@
   import EmptyState from '$lib/components/common/empty-state.svelte';
   import ViewSwitcher from '$lib/components/common/page-toolbar/view-switcher.svelte';
   import { allAssetFolders, allAssets, getCollectionsByAsset } from '$lib/services/assets';
-  import { selectedCollection } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
   import { selectAssetsView, showContentOverlay } from '$lib/services/contents/draft/editor';
   import {
     allCloudStorageServices,
diff --git a/src/lib/components/contents/contents-page.svelte b/src/lib/components/contents/contents-page.svelte
index bf22547f..9a28cc82 100644
--- a/src/lib/components/contents/contents-page.svelte
+++ b/src/lib/components/contents/contents-page.svelte
@@ -12,12 +12,13 @@
   import SecondarySidebar from '$lib/components/contents/list/secondary-sidebar.svelte';
   import SecondaryToolbar from '$lib/components/contents/list/secondary-toolbar.svelte';
   import { announcedPageStatus, parseLocation } from '$lib/services/app/navigation';
-  import { getCollection, getFile, selectedCollection } from '$lib/services/contents';
-  import { contentUpdatesToast } from '$lib/services/contents/data';
+  import { getCollection, selectedCollection } from '$lib/services/contents/collection';
+  import { contentUpdatesToast } from '$lib/services/contents/collection/data';
+  import { getFile } from '$lib/services/contents/collection/files';
+  import { listedEntries } from '$lib/services/contents/collection/view';
   import { createDraft } from '$lib/services/contents/draft/create';
   import { showContentOverlay } from '$lib/services/contents/draft/editor';
   import { getEntryTitle } from '$lib/services/contents/entry';
-  import { listedEntries } from '$lib/services/contents/view';
 
   /**
    * Navigate to the content list or content details page given the URL hash.
diff --git a/src/lib/components/contents/details/toolbar.svelte b/src/lib/components/contents/details/toolbar.svelte
index ed86cafe..df0f0802 100644
--- a/src/lib/components/contents/details/toolbar.svelte
+++ b/src/lib/components/contents/details/toolbar.svelte
@@ -20,7 +20,7 @@
   import { goBack, goto } from '$lib/services/app/navigation';
   import { backendName } from '$lib/services/backends';
   import { siteConfig } from '$lib/services/config';
-  import { deleteEntries } from '$lib/services/contents/data';
+  import { deleteEntries } from '$lib/services/contents/collection/data';
   import { entryDraft } from '$lib/services/contents/draft';
   import { createDraft, duplicateDraft } from '$lib/services/contents/draft/create';
   import { copyFromLocaleToast, entryEditorSettings } from '$lib/services/contents/draft/editor';
diff --git a/src/lib/components/contents/details/widgets/date-time/date-time-editor.svelte b/src/lib/components/contents/details/widgets/date-time/date-time-editor.svelte
index 3000be82..32e352b0 100644
--- a/src/lib/components/contents/details/widgets/date-time/date-time-editor.svelte
+++ b/src/lib/components/contents/details/widgets/date-time/date-time-editor.svelte
@@ -13,7 +13,7 @@
     getDate,
     getInputValue,
     parseDateTimeConfig,
-  } from '$lib/components/contents/details/widgets/date-time/helper';
+  } from '$lib/services/contents/widgets/date-time';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/date-time/date-time-preview.svelte b/src/lib/components/contents/details/widgets/date-time/date-time-preview.svelte
index 29b824b0..77c8776b 100644
--- a/src/lib/components/contents/details/widgets/date-time/date-time-preview.svelte
+++ b/src/lib/components/contents/details/widgets/date-time/date-time-preview.svelte
@@ -4,11 +4,8 @@
   @see https://decapcms.org/docs/widgets/#datetime
 -->
 <script>
-  import {
-    getDate,
-    parseDateTimeConfig,
-  } from '$lib/components/contents/details/widgets/date-time/helper';
   import { getCanonicalLocale } from '$lib/services/contents/i18n';
+  import { getDate, parseDateTimeConfig } from '$lib/services/contents/widgets/date-time';
   import { dateFormatOptions, timeFormatOptions } from '$lib/services/utils/date';
 
   /**
diff --git a/src/lib/components/contents/details/widgets/list/list-editor.svelte b/src/lib/components/contents/details/widgets/list/list-editor.svelte
index 501eeb04..be9d273c 100644
--- a/src/lib/components/contents/details/widgets/list/list-editor.svelte
+++ b/src/lib/components/contents/details/widgets/list/list-editor.svelte
@@ -12,7 +12,6 @@
   import { onMount } from 'svelte';
   import { _ } from 'svelte-i18n';
   import FieldEditor from '$lib/components/contents/details/editor/field-editor.svelte';
-  import { formatSummary } from '$lib/components/contents/details/widgets/list/helper';
   import AddItemButton from '$lib/components/contents/details/widgets/object/add-item-button.svelte';
   import ObjectHeader from '$lib/components/contents/details/widgets/object/object-header.svelte';
   import { entryDraft } from '$lib/services/contents/draft';
@@ -20,6 +19,7 @@
   import { syncExpanderStates } from '$lib/services/contents/draft/editor';
   import { updateListField } from '$lib/services/contents/draft/update';
   import { defaultI18nConfig } from '$lib/services/contents/i18n';
+  import { formatSummary } from '$lib/services/contents/widgets/list';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/markdown/markdown-editor.svelte b/src/lib/components/contents/details/widgets/markdown/markdown-editor.svelte
index 79687388..41b488e9 100644
--- a/src/lib/components/contents/details/widgets/markdown/markdown-editor.svelte
+++ b/src/lib/components/contents/details/widgets/markdown/markdown-editor.svelte
@@ -6,6 +6,10 @@
 <script>
   import { TextEditor } from '@sveltia/ui';
   import { sleep } from '@sveltia/utils/misc';
+  import {
+    EditorComponent,
+    getComponentDef,
+  } from '$lib/services/contents/widgets/markdown/component';
   import {
     buttonNameMap,
     defaultButtons,
@@ -13,11 +17,7 @@
     defaultModes,
     modeNameMap,
     registeredComponents,
-  } from '$lib/components/contents/details/widgets/markdown';
-  import {
-    EditorComponent,
-    getComponentDef,
-  } from '$lib/components/contents/details/widgets/markdown/component';
+  } from '$lib/services/contents/widgets/markdown/index';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/object/object-editor.svelte b/src/lib/components/contents/details/widgets/object/object-editor.svelte
index 605856d9..98bccf4a 100644
--- a/src/lib/components/contents/details/widgets/object/object-editor.svelte
+++ b/src/lib/components/contents/details/widgets/object/object-editor.svelte
@@ -13,7 +13,6 @@
   import { _ } from 'svelte-i18n';
   import FieldEditor from '$lib/components/contents/details/editor/field-editor.svelte';
   import AddItemButton from '$lib/components/contents/details/widgets/object/add-item-button.svelte';
-  import { formatSummary } from '$lib/components/contents/details/widgets/object/helper';
   import ObjectHeader from '$lib/components/contents/details/widgets/object/object-header.svelte';
   import { entryDraft, i18nAutoDupEnabled } from '$lib/services/contents/draft';
   import { getDefaultValues } from '$lib/services/contents/draft/create';
@@ -21,6 +20,7 @@
   import { copyDefaultLocaleValues } from '$lib/services/contents/draft/update';
   import { getFieldConfig } from '$lib/services/contents/entry';
   import { defaultI18nConfig } from '$lib/services/contents/i18n';
+  import { formatSummary } from '$lib/services/contents/widgets/object';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/relation/relation-editor.svelte b/src/lib/components/contents/details/widgets/relation/relation-editor.svelte
index 47192722..f99a325f 100644
--- a/src/lib/components/contents/details/widgets/relation/relation-editor.svelte
+++ b/src/lib/components/contents/details/widgets/relation/relation-editor.svelte
@@ -4,9 +4,10 @@
   @see https://decapcms.org/docs/widgets/#relation
 -->
 <script>
-  import { getOptions } from '$lib/components/contents/details/widgets/relation/helper';
   import SelectEditor from '$lib/components/contents/details/widgets/select/select-editor.svelte';
-  import { getEntriesByCollection, getFile } from '$lib/services/contents';
+  import { getEntriesByCollection } from '$lib/services/contents/collection/entries';
+  import { getFile } from '$lib/services/contents/collection/files';
+  import { getOptions } from '$lib/services/contents/widgets/relation';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/relation/relation-preview.svelte b/src/lib/components/contents/details/widgets/relation/relation-preview.svelte
index eb77592e..f3e37257 100644
--- a/src/lib/components/contents/details/widgets/relation/relation-preview.svelte
+++ b/src/lib/components/contents/details/widgets/relation/relation-preview.svelte
@@ -4,9 +4,10 @@
   @see https://decapcms.org/docs/widgets/#relation
 -->
 <script>
-  import { getOptions } from '$lib/components/contents/details/widgets/relation/helper';
-  import { getEntriesByCollection, getFile } from '$lib/services/contents';
+  import { getEntriesByCollection } from '$lib/services/contents/collection/entries';
+  import { getFile } from '$lib/services/contents/collection/files';
   import { getListFormatter } from '$lib/services/contents/i18n';
+  import { getOptions } from '$lib/services/contents/widgets/relation';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/details/widgets/string/character-counter.svelte b/src/lib/components/contents/details/widgets/string/character-counter.svelte
index bafb6d33..c4ae7527 100644
--- a/src/lib/components/contents/details/widgets/string/character-counter.svelte
+++ b/src/lib/components/contents/details/widgets/string/character-counter.svelte
@@ -1,6 +1,6 @@
 <script>
   import { _ } from 'svelte-i18n';
-  import { validateStringField } from '$lib/components/contents/details/widgets/string/helper';
+  import { validateStringField } from '$lib/services/contents/widgets/string';
 
   /**
    * @type {StringField | TextField}
diff --git a/src/lib/components/contents/details/widgets/uuid/uuid-editor.svelte b/src/lib/components/contents/details/widgets/uuid/uuid-editor.svelte
index f64b5615..1f217d68 100644
--- a/src/lib/components/contents/details/widgets/uuid/uuid-editor.svelte
+++ b/src/lib/components/contents/details/widgets/uuid/uuid-editor.svelte
@@ -6,9 +6,9 @@
 <script>
   import { TextInput } from '@sveltia/ui';
   import { onMount } from 'svelte';
-  import { getDefaultValue } from '$lib/components/contents/details/widgets/uuid/helper';
   import { entryDraft } from '$lib/services/contents/draft';
   import { defaultI18nConfig } from '$lib/services/contents/i18n';
+  import { getDefaultValue } from '$lib/services/contents/widgets/uuid';
 
   /**
    * @type {LocaleCode}
diff --git a/src/lib/components/contents/list/entry-list-item.svelte b/src/lib/components/contents/list/entry-list-item.svelte
index 77ed9d81..a63e479f 100644
--- a/src/lib/components/contents/list/entry-list-item.svelte
+++ b/src/lib/components/contents/list/entry-list-item.svelte
@@ -2,9 +2,9 @@
   import { Checkbox, GridCell, GridRow } from '@sveltia/ui';
   import Image from '$lib/components/common/image.svelte';
   import { goto } from '$lib/services/app/navigation';
-  import { selectedEntries } from '$lib/services/contents';
+  import { selectedEntries } from '$lib/services/contents/collection/entries';
+  import { listedEntries } from '$lib/services/contents/collection/view';
   import { getEntryThumbnail, getEntryTitle } from '$lib/services/contents/entry';
-  import { listedEntries } from '$lib/services/contents/view';
 
   /**
    * @type {EntryCollection}
diff --git a/src/lib/components/contents/list/entry-list.svelte b/src/lib/components/contents/list/entry-list.svelte
index e4bee7cb..5eb4d6dc 100644
--- a/src/lib/components/contents/list/entry-list.svelte
+++ b/src/lib/components/contents/list/entry-list.svelte
@@ -7,8 +7,8 @@
   import ListingGrid from '$lib/components/common/listing-grid.svelte';
   import EntryListItem from '$lib/components/contents/list/entry-list-item.svelte';
   import { goto } from '$lib/services/app/navigation';
-  import { selectedCollection } from '$lib/services/contents';
-  import { currentView, entryGroups, listedEntries } from '$lib/services/contents/view';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { currentView, entryGroups, listedEntries } from '$lib/services/contents/collection/view';
 
   $: collection = (() => /** @type {EntryCollection | undefined} */ ($selectedCollection))();
   $: viewType = $currentView.type;
diff --git a/src/lib/components/contents/list/file-list.svelte b/src/lib/components/contents/list/file-list.svelte
index 5bf85916..5e355c82 100644
--- a/src/lib/components/contents/list/file-list.svelte
+++ b/src/lib/components/contents/list/file-list.svelte
@@ -6,7 +6,7 @@
   import ListContainer from '$lib/components/common/list-container.svelte';
   import ListingGrid from '$lib/components/common/listing-grid.svelte';
   import { goto } from '$lib/services/app/navigation';
-  import { selectedCollection } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
 </script>
 
 <ListContainer aria-label={$_('file_list')}>
diff --git a/src/lib/components/contents/list/primary-sidebar.svelte b/src/lib/components/contents/list/primary-sidebar.svelte
index c4e7f4c1..f4691c57 100644
--- a/src/lib/components/contents/list/primary-sidebar.svelte
+++ b/src/lib/components/contents/list/primary-sidebar.svelte
@@ -4,7 +4,9 @@
   import { _ } from 'svelte-i18n';
   import { goto } from '$lib/services/app/navigation';
   import { siteConfig } from '$lib/services/config';
-  import { allEntries, getEntriesByCollection, selectedCollection } from '$lib/services/contents';
+  import { allEntries } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { getEntriesByCollection } from '$lib/services/contents/collection/entries';
 
   $: collections = $siteConfig?.collections.filter(({ hide }) => !hide) ?? [];
 </script>
diff --git a/src/lib/components/contents/list/primary-toolbar.svelte b/src/lib/components/contents/list/primary-toolbar.svelte
index b49b2b03..4ba44346 100644
--- a/src/lib/components/contents/list/primary-toolbar.svelte
+++ b/src/lib/components/contents/list/primary-toolbar.svelte
@@ -3,9 +3,10 @@
   import DOMPurify from 'isomorphic-dompurify';
   import { marked } from 'marked';
   import { _ } from 'svelte-i18n';
-  import { selectedCollection, selectedEntries } from '$lib/services/contents';
-  import { goto } from '$lib/services/app/navigation';
   import DeleteEntriesDialog from '$lib/components/contents/shared/delete-entries-dialog.svelte';
+  import { goto } from '$lib/services/app/navigation';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { selectedEntries } from '$lib/services/contents/collection/entries';
 
   let showDeleteDialog = false;
 
diff --git a/src/lib/components/contents/list/secondary-sidebar.svelte b/src/lib/components/contents/list/secondary-sidebar.svelte
index e929d6c2..edc336e7 100644
--- a/src/lib/components/contents/list/secondary-sidebar.svelte
+++ b/src/lib/components/contents/list/secondary-sidebar.svelte
@@ -5,8 +5,8 @@
   import DropZone from '$lib/components/assets/shared/drop-zone.svelte';
   import { goto } from '$lib/services/app/navigation';
   import { allAssets, uploadingAssets } from '$lib/services/assets';
-  import { selectedCollection } from '$lib/services/contents';
-  import { currentView } from '$lib/services/contents/view';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { currentView } from '$lib/services/contents/collection/view';
 
   $: ({ internalPath, entryRelative } =
     $selectedCollection?._assetFolder ?? /** @type {CollectionAssetFolder} */ ({}));
diff --git a/src/lib/components/contents/list/secondary-toolbar.svelte b/src/lib/components/contents/list/secondary-toolbar.svelte
index b342a975..b87c0f15 100644
--- a/src/lib/components/contents/list/secondary-toolbar.svelte
+++ b/src/lib/components/contents/list/secondary-toolbar.svelte
@@ -6,8 +6,14 @@
   import ItemSelector from '$lib/components/common/page-toolbar/item-selector.svelte';
   import SortMenu from '$lib/components/common/page-toolbar/sort-menu.svelte';
   import ViewSwitcher from '$lib/components/common/page-toolbar/view-switcher.svelte';
-  import { selectedCollection, selectedEntries } from '$lib/services/contents';
-  import { currentView, entryGroups, listedEntries, sortFields } from '$lib/services/contents/view';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { selectedEntries } from '$lib/services/contents/collection/entries';
+  import {
+    currentView,
+    entryGroups,
+    listedEntries,
+    sortFields,
+  } from '$lib/services/contents/collection/view';
 
   $: ({ name: collectionName, _thumbnailFieldName } =
     $selectedCollection?._type === 'entry'
diff --git a/src/lib/components/contents/shared/delete-entries-dialog.svelte b/src/lib/components/contents/shared/delete-entries-dialog.svelte
index 977c1d4e..7d438aa1 100644
--- a/src/lib/components/contents/shared/delete-entries-dialog.svelte
+++ b/src/lib/components/contents/shared/delete-entries-dialog.svelte
@@ -1,10 +1,11 @@
 <script>
   import { ConfirmationDialog } from '@sveltia/ui';
   import { _ } from 'svelte-i18n';
-  import { selectedCollection, selectedEntries } from '$lib/services/contents';
-  import { deleteEntries } from '$lib/services/contents/data';
+  import { selectedCollection } from '$lib/services/contents/collection';
+  import { deleteEntries } from '$lib/services/contents/collection/data';
+  import { selectedEntries } from '$lib/services/contents/collection/entries';
+  import { listedEntries } from '$lib/services/contents/collection/view';
   import { getAssociatedAssets } from '$lib/services/contents/entry';
-  import { listedEntries } from '$lib/services/contents/view';
 
   export let open = false;
 
diff --git a/src/lib/components/global/main-router.svelte b/src/lib/components/global/main-router.svelte
index 1592ff0a..6aea45b9 100644
--- a/src/lib/components/global/main-router.svelte
+++ b/src/lib/components/global/main-router.svelte
@@ -12,7 +12,7 @@
   import WorkflowPage from '$lib/components/workflow/workflow-page.svelte';
   import { parseLocation, selectedPageName } from '$lib/services/app/navigation';
   import { showAssetOverlay } from '$lib/services/assets';
-  import { selectedCollection } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
   import { showContentOverlay } from '$lib/services/contents/draft/editor';
 
   /**
diff --git a/src/lib/components/global/toolbar/items/page-switcher.svelte b/src/lib/components/global/toolbar/items/page-switcher.svelte
index f983e1a7..64a2a8cc 100644
--- a/src/lib/components/global/toolbar/items/page-switcher.svelte
+++ b/src/lib/components/global/toolbar/items/page-switcher.svelte
@@ -3,7 +3,7 @@
   import { _ } from 'svelte-i18n';
   import { goto, selectedPageName } from '$lib/services/app/navigation';
   import { selectedAssetFolder } from '$lib/services/assets';
-  import { selectedCollection } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
 
   $: pages = [
     {
diff --git a/src/lib/components/global/toolbar/items/quick-search-bar.svelte b/src/lib/components/global/toolbar/items/quick-search-bar.svelte
index f992ec06..4edff493 100644
--- a/src/lib/components/global/toolbar/items/quick-search-bar.svelte
+++ b/src/lib/components/global/toolbar/items/quick-search-bar.svelte
@@ -2,7 +2,7 @@
   import { SearchBar } from '@sveltia/ui';
   import { _ } from 'svelte-i18n';
   import { goBack, goto, parseLocation } from '$lib/services/app/navigation';
-  import { selectedCollection } from '$lib/services/contents';
+  import { selectedCollection } from '$lib/services/contents/collection';
   import { searchTerms } from '$lib/services/search';
 
   /**
diff --git a/src/lib/components/search/entry-result-item.svelte b/src/lib/components/search/entry-result-item.svelte
index f5dd43b0..dc7e48c7 100644
--- a/src/lib/components/search/entry-result-item.svelte
+++ b/src/lib/components/search/entry-result-item.svelte
@@ -2,7 +2,8 @@
   import { GridCell, GridRow } from '@sveltia/ui';
   import Image from '$lib/components/common/image.svelte';
   import { goto } from '$lib/services/app/navigation';
-  import { getCollectionsByEntry, getFilesByEntry } from '$lib/services/contents';
+  import { getCollectionsByEntry } from '$lib/services/contents/collection';
+  import { getFilesByEntry } from '$lib/services/contents/collection/files';
   import { getEntryThumbnail, getEntryTitle } from '$lib/services/contents/entry';
   import { defaultI18nConfig } from '$lib/services/contents/i18n';
 
diff --git a/src/lib/services/assets/data.js b/src/lib/services/assets/data.js
index 50a7d25b..8ebc9e62 100644
--- a/src/lib/services/assets/data.js
+++ b/src/lib/services/assets/data.js
@@ -14,12 +14,10 @@ import {
 } from '$lib/services/assets';
 import { backend, backendName } from '$lib/services/backends';
 import { siteConfig } from '$lib/services/config';
-import {
-  allEntries,
-  getCollectionsByEntry,
-  getEntriesByAssetURL,
-  getFilesByEntry,
-} from '$lib/services/contents';
+import { allEntries } from '$lib/services/contents';
+import { getCollectionsByEntry } from '$lib/services/contents/collection';
+import { getEntriesByAssetURL } from '$lib/services/contents/collection/entries';
+import { getFilesByEntry } from '$lib/services/contents/collection/files';
 import { createSavingEntryData } from '$lib/services/contents/draft/save';
 import { renameIfNeeded } from '$lib/services/utils/file';
 
diff --git a/src/lib/services/assets/index.js b/src/lib/services/assets/index.js
index f4ada7c8..91a14171 100644
--- a/src/lib/services/assets/index.js
+++ b/src/lib/services/assets/index.js
@@ -6,13 +6,10 @@ import mime from 'mime';
 import { derived, get, writable } from 'svelte/store';
 import { backend } from '$lib/services/backends';
 import { siteConfig } from '$lib/services/config';
-import {
-  getCollection,
-  getCollectionsByEntry,
-  getEntriesByAssetURL,
-  getFilesByEntry,
-} from '$lib/services/contents';
-import { fillSlugTemplate } from '$lib/services/contents/slug';
+import { getCollection, getCollectionsByEntry } from '$lib/services/contents/collection';
+import { getEntriesByAssetURL } from '$lib/services/contents/collection/entries';
+import { getFilesByEntry } from '$lib/services/contents/collection/files';
+import { fillSlugTemplate } from '$lib/services/contents/entry/slug';
 import { createPath, resolvePath } from '$lib/services/utils/file';
 import { convertImage, getMediaMetadata, renderPDF } from '$lib/services/utils/media';
 
diff --git a/src/lib/services/config.js b/src/lib/services/config.js
index 532376ec..073cdf76 100644
--- a/src/lib/services/config.js
+++ b/src/lib/services/config.js
@@ -7,7 +7,8 @@ import { get, writable } from 'svelte/store';
 import YAML from 'yaml';
 import { prefs } from '$lib/services/prefs';
 import { getI18nConfig } from '$lib/services/contents/i18n';
-import { allEntryFolders, getCollection, selectedCollection } from '$lib/services/contents';
+import { getCollection, selectedCollection } from '$lib/services/contents/collection';
+import { allEntryFolders } from '$lib/services/contents';
 import { allBackendServices } from '$lib/services/backends';
 import { allAssetFolders } from '$lib/services/assets';
 
diff --git a/src/lib/services/contents/data.js b/src/lib/services/contents/collection/data.js
similarity index 93%
rename from src/lib/services/contents/data.js
rename to src/lib/services/contents/collection/data.js
index 13bee528..ab5eb8a0 100644
--- a/src/lib/services/contents/data.js
+++ b/src/lib/services/contents/collection/data.js
@@ -1,7 +1,8 @@
 import { get, writable } from 'svelte/store';
 import { allAssets } from '$lib/services/assets';
 import { backend } from '$lib/services/backends';
-import { allEntries, selectedCollection } from '$lib/services/contents';
+import { allEntries } from '$lib/services/contents';
+import { selectedCollection } from '$lib/services/contents/collection';
 
 /**
  * @type {import('svelte/store').Writable<UpdatesToastState>}
diff --git a/src/lib/services/contents/collection/entries.js b/src/lib/services/contents/collection/entries.js
new file mode 100644
index 00000000..02a47ae2
--- /dev/null
+++ b/src/lib/services/contents/collection/entries.js
@@ -0,0 +1,170 @@
+import { get, writable } from 'svelte/store';
+import { getMediaFieldURL } from '$lib/services/assets';
+import { siteConfig } from '$lib/services/config';
+import { allEntries } from '$lib/services/contents';
+import { getCollection, getCollectionsByEntry } from '$lib/services/contents/collection';
+import { getFilesByEntry } from '$lib/services/contents/collection/files';
+import { getFieldConfig, getPropertyValue } from '$lib/services/contents/entry';
+
+/**
+ * Regular expression to match `![alt](src "title")`.
+ */
+const markdownImageRegEx = /!\[.*?\]\((.+?)(?:\s+".*?")?\)/g;
+
+/**
+ * @type {import('svelte/store').Writable<Entry[]>}
+ */
+export const selectedEntries = writable([]);
+
+/**
+ * Get entries by the given collection name, while applying a filer if needed.
+ * @param {string} collectionName - Collection name.
+ * @returns {Entry[]} Entries.
+ * @see https://decapcms.org/docs/collection-types#filtered-folder-collections
+ */
+export const getEntriesByCollection = (collectionName) => {
+  const collection = getCollection(collectionName);
+
+  if (!collection) {
+    return [];
+  }
+
+  const {
+    filter,
+    _i18n: { defaultLocale: locale },
+  } = collection;
+
+  const filterField = filter?.field;
+
+  const filterPattern =
+    typeof filter?.pattern === 'string' ? new RegExp(filter.pattern) : undefined;
+
+  const filterValues =
+    filter?.value === undefined ? [] : Array.isArray(filter.value) ? filter.value : [filter.value];
+
+  return get(allEntries).filter((entry) => {
+    if (!getCollectionsByEntry(entry).some(({ name }) => name === collectionName)) {
+      return false;
+    }
+
+    if (!filterField) {
+      return true;
+    }
+
+    const value = getPropertyValue({ entry, locale, collectionName, key: filterField }) ?? null;
+
+    if (filterPattern) {
+      return filterPattern.test(value);
+    }
+
+    return filterValues.includes(value);
+  });
+};
+
+/**
+ * Find entries by an asset URL, and replace the URL if needed.
+ * @param {string} url - Asset’s public or blob URL.
+ * @param {object} [options] - Options.
+ * @param {Entry[]} [options.entries] - Entries to be searched.
+ * @param {string} [options.newURL] - New URL to replace the found URL.
+ * @returns {Promise<Entry[]>} Found (and replaced) entries.
+ */
+export const getEntriesByAssetURL = async (
+  url,
+  { entries = get(allEntries), newURL = '' } = {},
+) => {
+  const siteURL = get(siteConfig)?.site_url;
+  const assetURL = siteURL && !url.startsWith('blob:') ? url.replace(siteURL, '') : url;
+
+  const results = await Promise.all(
+    entries.map(async (entry) => {
+      const { locales } = entry;
+      const collections = getCollectionsByEntry(entry);
+
+      const _results = await Promise.all(
+        Object.values(locales).map(async ({ content }) => {
+          const __results = await Promise.all(
+            Object.entries(content).map(async ([keyPath, value]) => {
+              if (typeof value !== 'string' || !value) {
+                return false;
+              }
+
+              const ___results = await Promise.all(
+                collections.map(async (collection) => {
+                  /**
+                   * Check if the field contains the asset.
+                   * @param {CollectionFile} [collectionFile] - File. File collection only.
+                   * @returns {Promise<boolean>} Result.
+                   */
+                  const hasAsset = async (collectionFile) => {
+                    const field = getFieldConfig({
+                      collectionName: collection.name,
+                      fileName: collectionFile?.name,
+                      valueMap: content,
+                      keyPath,
+                    });
+
+                    if (!field) {
+                      return false;
+                    }
+
+                    const { widget: widgetName = 'string' } = field;
+
+                    if (['image', 'file'].includes(widgetName)) {
+                      const match = (await getMediaFieldURL(value, entry)) === assetURL;
+
+                      if (match && newURL) {
+                        content[keyPath] = newURL;
+                      }
+
+                      return match;
+                    }
+
+                    // Search images in markdown body
+                    if (widgetName === 'markdown') {
+                      const matches = [...value.matchAll(markdownImageRegEx)];
+
+                      if (matches.length) {
+                        return (
+                          await Promise.all(
+                            matches.map(async ([, src]) => {
+                              const match = (await getMediaFieldURL(src, entry)) === assetURL;
+
+                              if (match && newURL) {
+                                content[keyPath] = content[keyPath].replace(src, newURL);
+                              }
+
+                              return match;
+                            }),
+                          )
+                        ).some(Boolean);
+                      }
+                    }
+
+                    return false;
+                  };
+
+                  const collectionFiles = getFilesByEntry(collection, entry);
+
+                  if (collectionFiles.length) {
+                    return (await Promise.all(collectionFiles.map(hasAsset))).includes(true);
+                  }
+
+                  return hasAsset();
+                }),
+              );
+
+              return ___results.includes(true);
+            }),
+          );
+
+          return __results.includes(true);
+        }),
+      );
+
+      return _results.includes(true);
+    }),
+  );
+
+  return entries.filter((_entry, index) => results[index]);
+};
diff --git a/src/lib/services/contents/collection/files.js b/src/lib/services/contents/collection/files.js
new file mode 100644
index 00000000..eaa80d40
--- /dev/null
+++ b/src/lib/services/contents/collection/files.js
@@ -0,0 +1,42 @@
+import { get } from 'svelte/store';
+import { allEntries } from '$lib/services/contents';
+import { getCollectionsByEntry } from '$lib/services/contents/collection';
+
+/**
+ * Get a file collection’s file configurations that matches the given entry. One file can
+ * theoretically appear in multiple collections files depending on the configuration, so that the
+ * result is an array.
+ * @param {Collection} collection - Collection.
+ * @param {Entry} entry - Entry.
+ * @returns {CollectionFile[]} Collection files.
+ */
+export const getFilesByEntry = (collection, entry) => {
+  const _fileMap = collection.files
+    ? /** @type {FileCollection} */ (collection)._fileMap
+    : undefined;
+
+  if (!_fileMap) {
+    // It’s an entry collection
+    return [];
+  }
+
+  return Object.values(_fileMap).filter(
+    ({ _file, _i18n }) => _file.fullPath === entry.locales[_i18n.defaultLocale]?.path,
+  );
+};
+
+/**
+ * Get a file collection entry that matches the given collection name and file name.
+ * @param {string} collectionName - Collection name.
+ * @param {string} fileName - File name.
+ * @returns {Entry | undefined} File.
+ * @see https://decapcms.org/docs/collection-types/#file-collections
+ */
+export const getFile = (collectionName, fileName) =>
+  get(allEntries).find((entry) =>
+    getCollectionsByEntry(entry).some(
+      (collection) =>
+        collection.name === collectionName &&
+        getFilesByEntry(collection, entry).some((file) => file.name === fileName),
+    ),
+  );
diff --git a/src/lib/services/contents/collection/index.js b/src/lib/services/contents/collection/index.js
new file mode 100644
index 00000000..0df48da4
--- /dev/null
+++ b/src/lib/services/contents/collection/index.js
@@ -0,0 +1,100 @@
+import { stripSlashes } from '@sveltia/utils/string';
+import { get, writable } from 'svelte/store';
+import { allAssetFolders } from '$lib/services/assets';
+import { siteConfig } from '$lib/services/config';
+import { getEntryFoldersByPath } from '$lib/services/contents';
+import { getFileConfig } from '$lib/services/contents/file';
+import { getI18nConfig } from '$lib/services/contents/i18n';
+
+/**
+ * @type {import('svelte/store').Writable<Collection | undefined>}
+ */
+export const selectedCollection = writable();
+
+/**
+ * @type {Map<string, Collection | undefined>}
+ */
+const collectionCacheMap = new Map();
+
+/**
+ * Get a collection by name.
+ * @param {string} name - Collection name.
+ * @returns {Collection | undefined} Collection, including some extra, normalized properties.
+ */
+export const getCollection = (name) => {
+  const cache = collectionCacheMap.get(name);
+
+  if (cache) {
+    return cache;
+  }
+
+  const rawCollection = get(siteConfig)?.collections.find((c) => c.name === name);
+  const isEntryCollection = typeof rawCollection?.folder === 'string';
+  const isFileCollection = !isEntryCollection && Array.isArray(rawCollection?.files);
+
+  // Ignore invalid collection
+  if (!isEntryCollection && !isFileCollection) {
+    collectionCacheMap.set(name, undefined);
+
+    return undefined;
+  }
+
+  const { fields, thumbnail, folder, files } = rawCollection;
+
+  // Normalize folder/file paths by removing leading/trailing slashes
+  if (isEntryCollection) {
+    rawCollection.folder = stripSlashes(/** @type {string} */ (folder));
+  } else {
+    /** @type {RawCollectionFile[]} */ (files).forEach((f) => {
+      f.file = stripSlashes(f.file);
+    });
+  }
+
+  const _i18n = getI18nConfig(rawCollection);
+
+  const collectionBase = {
+    ...rawCollection,
+    _i18n,
+    _assetFolder: get(allAssetFolders).find(({ collectionName }) => collectionName === name),
+  };
+
+  /** @type {Collection} */
+  const collection = isEntryCollection
+    ? {
+        ...collectionBase,
+        _type: /** @type {CollectionType} */ ('entry'),
+        _file: getFileConfig({ rawCollection, _i18n }),
+        _thumbnailFieldName: rawCollection.folder
+          ? (thumbnail ?? fields?.find(({ widget }) => widget === 'image')?.name)
+          : undefined,
+      }
+    : {
+        ...collectionBase,
+        _type: /** @type {CollectionType} */ ('file'),
+        _fileMap: /** @type {RawCollectionFile[]} */ (files)?.length
+          ? Object.fromEntries(
+              files.map((file) => {
+                const __i18n = getI18nConfig(rawCollection, file);
+                const __file = getFileConfig({ rawCollection, file, _i18n: __i18n });
+
+                return [file.name, { ...file, _file: __file, _i18n: __i18n }];
+              }),
+            )
+          : {},
+      };
+
+  collectionCacheMap.set(name, collection);
+
+  return collection;
+};
+
+/**
+ * Get a list of collections the given entry belongs to. One entry can theoretically appear in
+ * multiple collections depending on the configuration, so that the result is an array.
+ * @param {Entry} entry - Entry.
+ * @returns {Collection[]} Collections.
+ */
+export const getCollectionsByEntry = (entry) =>
+  getEntryFoldersByPath(Object.values(entry.locales)[0].path)
+    .map(({ collectionName }) => getCollection(collectionName))
+    .filter((collection) => !!collection);
diff --git a/src/lib/services/contents/view.js b/src/lib/services/contents/collection/view.js
similarity index 97%
rename from src/lib/services/contents/view.js
rename to src/lib/services/contents/collection/view.js
index f0921c14..ffeb0f79 100644
--- a/src/lib/services/contents/view.js
+++ b/src/lib/services/contents/collection/view.js
@@ -4,21 +4,18 @@ import equal from 'fast-deep-equal';
 import { flatten } from 'flat';
 import { _, locale as appLocale } from 'svelte-i18n';
 import { derived, get, writable } from 'svelte/store';
-import { prefs } from '$lib/services/prefs';
+import { backend } from '$lib/services/backends';
+import { allEntries } from '$lib/services/contents';
+import { selectedCollection } from '$lib/services/contents/collection';
+import { getEntriesByCollection, selectedEntries } from '$lib/services/contents/collection/entries';
+import { getFilesByEntry } from '$lib/services/contents/collection/files';
 import {
   getEntryTitleFromContent,
   getFieldConfig,
   getPropertyValue,
 } from '$lib/services/contents/entry';
-import {
-  allEntries,
-  getEntriesByCollection,
-  getFilesByEntry,
-  selectedCollection,
-  selectedEntries,
-} from '$lib/services/contents';
-import { backend } from '$lib/services/backends';
-import { getDate } from '$lib/components/contents/details/widgets/date-time/helper';
+import { getDate } from '$lib/services/contents/widgets/date-time';
+import { prefs } from '$lib/services/prefs';
 
 /**
  * @see https://decapcms.org/docs/configuration-options/#sortable_fields
diff --git a/src/lib/services/contents/draft/create.js b/src/lib/services/contents/draft/create.js
index 35be919d..fd0bbad1 100644
--- a/src/lib/services/contents/draft/create.js
+++ b/src/lib/services/contents/draft/create.js
@@ -1,13 +1,13 @@
 import { stripTags } from '@sveltia/utils/string';
 import { get } from 'svelte/store';
-import { getDefaultValue as getDefaultDateTimeValue } from '$lib/components/contents/details/widgets/date-time/helper';
-import { getDefaultValue as getDefaultHiddenValue } from '$lib/components/contents/details/widgets/hidden/helper';
-import { getDefaultValue as getDefaultUuidValue } from '$lib/components/contents/details/widgets/uuid/helper';
-import { getCollection } from '$lib/services/contents';
+import { getCollection } from '$lib/services/contents/collection';
 import { entryDraft, i18nAutoDupEnabled } from '$lib/services/contents/draft';
 import { restoreBackupIfNeeded } from '$lib/services/contents/draft/backup';
 import { showDuplicateToast } from '$lib/services/contents/draft/editor';
 import { getFieldConfig } from '$lib/services/contents/entry';
+import { getDefaultValue as getDefaultDateTimeValue } from '$lib/services/contents/widgets/date-time';
+import { getDefaultValue as getDefaultHiddenValue } from '$lib/services/contents/widgets/hidden';
+import { getDefaultValue as getDefaultUuidValue } from '$lib/services/contents/widgets/uuid';
 
 /**
  * Parse the given dynamic default value.
diff --git a/src/lib/services/contents/draft/save.js b/src/lib/services/contents/draft/save.js
index 13f1d4f3..820bbc59 100644
--- a/src/lib/services/contents/draft/save.js
+++ b/src/lib/services/contents/draft/save.js
@@ -9,19 +9,19 @@ import { compare, escapeRegExp } from '@sveltia/utils/string';
 import { unflatten } from 'flat';
 import { TomlDate } from 'smol-toml';
 import { get } from 'svelte/store';
-import { hasRootListField } from '$lib/components/contents/details/widgets/list/helper';
 import { allAssetFolders, allAssets, getAssetKind, getAssetsByDirName } from '$lib/services/assets';
 import { backend, backendName, isLastCommitPublished } from '$lib/services/backends';
 import { siteConfig } from '$lib/services/config';
 import { allEntries } from '$lib/services/contents';
-import { contentUpdatesToast } from '$lib/services/contents/data';
+import { contentUpdatesToast } from '$lib/services/contents/collection/data';
 import { entryDraft } from '$lib/services/contents/draft';
 import { deleteBackup } from '$lib/services/contents/draft/backup';
 import { expandInvalidFields } from '$lib/services/contents/draft/editor';
 import { validateEntry } from '$lib/services/contents/draft/validate';
 import { getFieldConfig } from '$lib/services/contents/entry';
+import { fillSlugTemplate } from '$lib/services/contents/entry/slug';
 import { formatEntryFile } from '$lib/services/contents/file/format';
-import { fillSlugTemplate } from '$lib/services/contents/slug';
+import { hasRootListField } from '$lib/services/contents/widgets/list';
 import { user } from '$lib/services/user';
 import { fullDateTimeRegEx } from '$lib/services/utils/date';
 import { createPath, renameIfNeeded, resolvePath } from '$lib/services/utils/file';
diff --git a/src/lib/services/contents/draft/validate.js b/src/lib/services/contents/draft/validate.js
index bd02c099..3500a89d 100644
--- a/src/lib/services/contents/draft/validate.js
+++ b/src/lib/services/contents/draft/validate.js
@@ -1,8 +1,8 @@
 import { escapeRegExp } from '@sveltia/utils/string';
 import { get } from 'svelte/store';
-import { validateStringField } from '$lib/components/contents/details/widgets/string/helper';
 import { entryDraft } from '$lib/services/contents/draft';
 import { getFieldConfig } from '$lib/services/contents/entry';
+import { validateStringField } from '$lib/services/contents/widgets/string';
 
 /**
  * Validate the current entry draft, update the validity for all the fields, and return the final
diff --git a/src/lib/services/contents/entry.js b/src/lib/services/contents/entry/index.js
similarity index 96%
rename from src/lib/services/contents/entry.js
rename to src/lib/services/contents/entry/index.js
index b700c6ea..22227af3 100644
--- a/src/lib/services/contents/entry.js
+++ b/src/lib/services/contents/entry/index.js
@@ -6,8 +6,6 @@ import { parseInline } from 'marked';
 import moment from 'moment';
 import { parseEntities } from 'parse-entities';
 import { get } from 'svelte/store';
-import { getReferencedOptionLabel } from '$lib/components/contents/details/widgets/relation/helper';
-import { getOptionLabel } from '$lib/components/contents/details/widgets/select/helper';
 import {
   allAssets,
   getAssetByPath,
@@ -16,14 +14,17 @@ import {
 } from '$lib/services/assets';
 import { backend } from '$lib/services/backends';
 import { siteConfig } from '$lib/services/config';
-import { getCollection } from '$lib/services/contents';
+import { getCollection } from '$lib/services/contents/collection';
+import { fillSlugTemplate } from '$lib/services/contents/entry/slug';
+import { applyTransformations } from '$lib/services/contents/entry/transformations';
 import { getListFormatter } from '$lib/services/contents/i18n';
-import { applyTransformations, fillSlugTemplate } from '$lib/services/contents/slug';
+import { getReferencedOptionLabel } from '$lib/services/contents/widgets/relation';
+import { getOptionLabel } from '$lib/services/contents/widgets/select';
 
 /**
  * @type {Map<string, Field | undefined>}
  */
-const fieldConfigCache = new Map();
+const fieldConfigCacheMap = new Map();
 
 /**
  * Get a field’s config object that matches the given field name (key path).
@@ -42,7 +43,7 @@ export const getFieldConfig = ({
   keyPath,
 }) => {
   const cacheKey = JSON.stringify({ collectionName, fileName, valueMap, keyPath });
-  const cache = fieldConfigCache.get(cacheKey);
+  const cache = fieldConfigCacheMap.get(cacheKey);
 
   if (cache) {
     return cache;
@@ -55,7 +56,7 @@ export const getFieldConfig = ({
     : undefined;
 
   if (!collection || (fileName && !collectionFile)) {
-    fieldConfigCache.set(cacheKey, undefined);
+    fieldConfigCacheMap.set(cacheKey, undefined);
 
     return undefined;
   }
@@ -103,7 +104,7 @@ export const getFieldConfig = ({
     }
   });
 
-  fieldConfigCache.set(cacheKey, field);
+  fieldConfigCacheMap.set(cacheKey, field);
 
   return field;
 };
diff --git a/src/lib/services/contents/entry.spec.js b/src/lib/services/contents/entry/index.spec.js
similarity index 100%
rename from src/lib/services/contents/entry.spec.js
rename to src/lib/services/contents/entry/index.spec.js
diff --git a/src/lib/services/contents/slug.js b/src/lib/services/contents/entry/slug.js
similarity index 68%
rename from src/lib/services/contents/slug.js
rename to src/lib/services/contents/entry/slug.js
index 48225f5f..952f1930 100644
--- a/src/lib/services/contents/slug.js
+++ b/src/lib/services/contents/entry/slug.js
@@ -2,91 +2,12 @@ import transliterate from '@sindresorhus/transliterate';
 import { generateUUID } from '@sveltia/utils/crypto';
 import { getDateTimeParts } from '@sveltia/utils/datetime';
 import { truncate } from '@sveltia/utils/string';
-import moment from 'moment';
 import { get } from 'svelte/store';
-import { renameIfNeeded } from '$lib/services/utils/file';
-import { getEntryTitleFromContent, getFieldConfig } from '$lib/services/contents/entry';
-import { getEntriesByCollection } from '$lib/services/contents';
 import { siteConfig } from '$lib/services/config';
-import { parseDateTimeConfig } from '$lib/components/contents/details/widgets/date-time/helper';
-
-/**
- * Apply a string transformation to the value.
- * @param {object} args - Arguments.
- * @param {Field} [args.fieldConfig] - Field configuration.
- * @param {string} args.value - Original value.
- * @param {string} args.transformation - Transformation, e.g `upper`, `truncate(10)`.
- * @returns {string} Transformed value.
- * @see https://decapcms.org/docs/summary-strings/
- */
-const applyTransformation = ({ fieldConfig, value, transformation }) => {
-  const slugPartStr = String(value);
-
-  if (transformation === 'upper') {
-    return slugPartStr.toUpperCase();
-  }
-
-  if (transformation === 'lower') {
-    return slugPartStr.toLowerCase();
-  }
-
-  const dateTransformer = transformation.match(/^date\('(.*?)'\)$/);
-
-  if (dateTransformer) {
-    const [, format] = dateTransformer;
-    const { dateOnly, utc } = parseDateTimeConfig(/** @type {DateTimeField} */ (fieldConfig ?? {}));
-
-    return (
-      utc ||
-      (dateOnly && !!slugPartStr?.match(/^\d{4}-[01]\d-[0-3]\d$/)) ||
-      (dateOnly && !!slugPartStr.match(/T00:00(?::00)?(?:\.000)?Z$/))
-        ? moment.utc(slugPartStr)
-        : moment(slugPartStr)
-    ).format(format);
-  }
-
-  const defaultTransformer = transformation.match(/^default\('?(.*?)'?\)$/);
-
-  if (defaultTransformer) {
-    const [, defaultValue] = defaultTransformer;
-
-    return value ? slugPartStr : defaultValue;
-  }
-
-  const ternaryTransformer = transformation.match(/^ternary\('?(.*?)'?,\s*'?(.*?)'?\)$/);
-
-  if (ternaryTransformer) {
-    const [, truthyValue, falsyValue] = ternaryTransformer;
-
-    return value ? truthyValue : falsyValue;
-  }
-
-  const truncateTransformer = transformation.match(/^truncate\((\d+)(?:,\s*'?(.*?)'?)?\)$/);
-
-  if (truncateTransformer) {
-    const [, max, ellipsis = '…'] = truncateTransformer;
-
-    return truncate(slugPartStr, Number(max), { ellipsis });
-  }
-
-  return slugPartStr;
-};
-
-/**
- * Apply string transformations to the value.
- * @param {object} args - Arguments.
- * @param {Field} [args.fieldConfig] - Field configuration.
- * @param {string} args.value - Original value.
- * @param {string[]} args.transformations - List of transformations.
- * @returns {string} Transformed value.
- */
-export const applyTransformations = ({ fieldConfig, value, transformations }) => {
-  transformations.forEach((transformation) => {
-    value = applyTransformation({ fieldConfig, value, transformation });
-  });
-
-  return value;
-};
+import { getEntriesByCollection } from '$lib/services/contents/collection/entries';
+import { getEntryTitleFromContent, getFieldConfig } from '$lib/services/contents/entry';
+import { applyTransformations } from '$lib/services/contents/entry/transformations';
+import { renameIfNeeded } from '$lib/services/utils/file';
 
 /**
  * Normalize the given string as a slug for a filename.
diff --git a/src/lib/services/contents/slug.spec.js b/src/lib/services/contents/entry/slug.spec.js
similarity index 97%
rename from src/lib/services/contents/slug.spec.js
rename to src/lib/services/contents/entry/slug.spec.js
index 80bde92f..f9692b60 100644
--- a/src/lib/services/contents/slug.spec.js
+++ b/src/lib/services/contents/entry/slug.spec.js
@@ -1,7 +1,7 @@
 import { describe, expect, test } from 'vitest';
 import { siteConfig } from '$lib/services/config';
+import { fillSlugTemplate } from '$lib/services/contents/entry/slug';
 import { defaultI18nConfig } from '$lib/services/contents/i18n';
-import { fillSlugTemplate } from '$lib/services/contents/slug';
 
 describe('Test fillSlugTemplate()', () => {
   /** @type {Collection} */
diff --git a/src/lib/services/contents/entry/transformations.js b/src/lib/services/contents/entry/transformations.js
new file mode 100644
index 00000000..ff7d96e5
--- /dev/null
+++ b/src/lib/services/contents/entry/transformations.js
@@ -0,0 +1,81 @@
+import { truncate } from '@sveltia/utils/string';
+import moment from 'moment';
+import { parseDateTimeConfig } from '$lib/services/contents/widgets/date-time';
+
+/**
+ * Apply a string transformation to the value.
+ * @param {object} args - Arguments.
+ * @param {Field} [args.fieldConfig] - Field configuration.
+ * @param {string} args.value - Original value.
+ * @param {string} args.transformation - Transformation, e.g `upper`, `truncate(10)`.
+ * @returns {string} Transformed value.
+ * @see https://decapcms.org/docs/summary-strings/
+ */
+export const applyTransformation = ({ fieldConfig, value, transformation }) => {
+  const slugPartStr = String(value);
+
+  if (transformation === 'upper') {
+    return slugPartStr.toUpperCase();
+  }
+
+  if (transformation === 'lower') {
+    return slugPartStr.toLowerCase();
+  }
+
+  const dateTransformer = transformation.match(/^date\('(.*?)'\)$/);
+
+  if (dateTransformer) {
+    const [, format] = dateTransformer;
+    const { dateOnly, utc } = parseDateTimeConfig(/** @type {DateTimeField} */ (fieldConfig ?? {}));
+
+    return (
+      utc ||
+      (dateOnly && !!slugPartStr?.match(/^\d{4}-[01]\d-[0-3]\d$/)) ||
+      (dateOnly && !!slugPartStr.match(/T00:00(?::00)?(?:\.000)?Z$/))
+        ? moment.utc(slugPartStr)
+        : moment(slugPartStr)
+    ).format(format);
+  }
+
+  const defaultTransformer = transformation.match(/^default\('?(.*?)'?\)$/);
+
+  if (defaultTransformer) {
+    const [, defaultValue] = defaultTransformer;
+
+    return value ? slugPartStr : defaultValue;
+  }
+
+  const ternaryTransformer = transformation.match(/^ternary\('?(.*?)'?,\s*'?(.*?)'?\)$/);
+
+  if (ternaryTransformer) {
+    const [, truthyValue, falsyValue] = ternaryTransformer;
+
+    return value ? truthyValue : falsyValue;
+  }
+
+  const truncateTransformer = transformation.match(/^truncate\((\d+)(?:,\s*'?(.*?)'?)?\)$/);
+
+  if (truncateTransformer) {
+    const [, max, ellipsis = '…'] = truncateTransformer;
+
+    return truncate(slugPartStr, Number(max), { ellipsis });
+  }
+
+  return slugPartStr;
+};
+
+/**
+ * Apply string transformations to the value.
+ * @param {object} args - Arguments.
+ * @param {Field} [args.fieldConfig] - Field configuration.
+ * @param {string} args.value - Original value.
+ * @param {string[]} args.transformations - List of transformations.
+ * @returns {string} Transformed value.
+ */
+export const applyTransformations = ({ fieldConfig, value, transformations }) => {
+  transformations.forEach((transformation) => {
+    value = applyTransformation({ fieldConfig, value, transformation });
+  });
+
+  return value;
+};
diff --git a/src/lib/services/contents/file/parse.js b/src/lib/services/contents/file/parse.js
index a7ea5ab7..c4479853 100644
--- a/src/lib/services/contents/file/parse.js
+++ b/src/lib/services/contents/file/parse.js
@@ -4,7 +4,7 @@ import * as TOML from 'smol-toml';
 import { get } from 'svelte/store';
 import YAML from 'yaml';
 import { customFileFormats, getFrontMatterDelimiters } from '$lib/services/contents/file';
-import { getCollection } from '$lib/services/contents';
+import { getCollection } from '$lib/services/contents/collection';
 
 /**
  * Parse a JSON document using the built-in method.
diff --git a/src/lib/services/contents/file/process.js b/src/lib/services/contents/file/process.js
index 29812029..491317cc 100644
--- a/src/lib/services/contents/file/process.js
+++ b/src/lib/services/contents/file/process.js
@@ -2,11 +2,11 @@ import { generateUUID } from '@sveltia/utils/crypto';
 import { getPathInfo } from '@sveltia/utils/file';
 import { isObject } from '@sveltia/utils/object';
 import { flatten } from 'flat';
-import { hasRootListField } from '$lib/components/contents/details/widgets/list/helper';
-import { getCollection } from '$lib/services/contents';
+import { getCollection } from '$lib/services/contents/collection';
 import { getEntryTitleFromContent } from '$lib/services/contents/entry';
+import { fillSlugTemplate, normalizeSlug } from '$lib/services/contents/entry/slug';
 import { parseEntryFile } from '$lib/services/contents/file/parse';
-import { fillSlugTemplate, normalizeSlug } from '$lib/services/contents/slug';
+import { hasRootListField } from '$lib/services/contents/widgets/list';
 
 /**
  * Determine the slug for the given entry content.
diff --git a/src/lib/services/contents/index.js b/src/lib/services/contents/index.js
index 2441a22a..6fcc0438 100644
--- a/src/lib/services/contents/index.js
+++ b/src/lib/services/contents/index.js
@@ -1,15 +1,5 @@
-import { stripSlashes } from '@sveltia/utils/string';
 import { get, writable } from 'svelte/store';
-import { allAssetFolders, getMediaFieldURL } from '$lib/services/assets';
-import { siteConfig } from '$lib/services/config';
-import { getFieldConfig, getPropertyValue } from '$lib/services/contents/entry';
-import { getFileConfig } from '$lib/services/contents/file';
-import { getI18nConfig } from '$lib/services/contents/i18n';
-
-/**
- * Regular expression to match `![alt](src "title")`.
- */
-const markdownImageRegEx = /!\[.*?\]\((.+?)(?:\s+".*?")?\)/g;
+import { getCollection } from '$lib/services/contents/collection';
 
 /**
  * @type {import('svelte/store').Writable<boolean>}
@@ -31,91 +21,6 @@ export const allEntries = writable([]);
  * @type {import('svelte/store').Writable<Error[]>}
  */
 export const entryParseErrors = writable([]);
-/**
- * @type {import('svelte/store').Writable<Collection | undefined>}
- */
-export const selectedCollection = writable();
-/**
- * @type {import('svelte/store').Writable<Entry[]>}
- */
-export const selectedEntries = writable([]);
-
-/**
- * @type {Map<string, Collection | undefined>}
- */
-const collectionCache = new Map();
-
-/**
- * Get a collection by name.
- * @param {string} name - Collection name.
- * @returns {Collection | undefined} Collection, including some extra, normalized properties.
- */
-export const getCollection = (name) => {
-  const cache = collectionCache.get(name);
-
-  if (cache) {
-    return cache;
-  }
-
-  const rawCollection = get(siteConfig)?.collections.find((c) => c.name === name);
-  const isEntryCollection = typeof rawCollection?.folder === 'string';
-  const isFileCollection = !isEntryCollection && Array.isArray(rawCollection?.files);
-
-  // Ignore invalid collection
-  if (!isEntryCollection && !isFileCollection) {
-    collectionCache.set(name, undefined);
-
-    return undefined;
-  }
-
-  const { fields, thumbnail, folder, files } = rawCollection;
-
-  // Normalize folder/file paths by removing leading/trailing slashes
-  if (isEntryCollection) {
-    rawCollection.folder = stripSlashes(/** @type {string} */ (folder));
-  } else {
-    /** @type {RawCollectionFile[]} */ (files).forEach((f) => {
-      f.file = stripSlashes(f.file);
-    });
-  }
-
-  const _i18n = getI18nConfig(rawCollection);
-
-  const collectionBase = {
-    ...rawCollection,
-    _i18n,
-    _assetFolder: get(allAssetFolders).find(({ collectionName }) => collectionName === name),
-  };
-
-  /** @type {Collection} */
-  const collection = isEntryCollection
-    ? {
-        ...collectionBase,
-        _type: /** @type {CollectionType} */ ('entry'),
-        _file: getFileConfig({ rawCollection, _i18n }),
-        _thumbnailFieldName: rawCollection.folder
-          ? (thumbnail ?? fields?.find(({ widget }) => widget === 'image')?.name)
-          : undefined,
-      }
-    : {
-        ...collectionBase,
-        _type: /** @type {CollectionType} */ ('file'),
-        _fileMap: /** @type {RawCollectionFile[]} */ (files)?.length
-          ? Object.fromEntries(
-              files.map((file) => {
-                const __i18n = getI18nConfig(rawCollection, file);
-                const __file = getFileConfig({ rawCollection, file, _i18n: __i18n });
-
-                return [file.name, { ...file, _file: __file, _i18n: __i18n }];
-              }),
-            )
-          : {},
-      };
-
-  collectionCache.set(name, collection);
-
-  return collection;
-};
 
 /**
  * Get collection entry folders that match the given path.
@@ -136,206 +41,3 @@ export const getEntryFoldersByPath = (path) =>
       )?._file?.fullPathRegEx?.test(path);
     })
     .sort((a, b) => b.folderPath?.localeCompare(a.folderPath ?? '') ?? 0);
-
-/**
- * Get a list of collections the given entry belongs to. One entry can theoretically appear in
- * multiple collections depending on the configuration, so that the result is an array.
- * @param {Entry} entry - Entry.
- * @returns {Collection[]} Collections.
- */
-export const getCollectionsByEntry = (entry) =>
-  getEntryFoldersByPath(Object.values(entry.locales)[0].path)
-    .map(({ collectionName }) => getCollection(collectionName))
-    .filter((collection) => !!collection);
-
-/**
- * Get a file collection’s file configurations that matches the given entry. One file can
- * theoretically appear in multiple collections files depending on the configuration, so that the
- * result is an array.
- * @param {Collection} collection - Collection.
- * @param {Entry} entry - Entry.
- * @returns {CollectionFile[]} Collection files.
- */
-export const getFilesByEntry = (collection, entry) => {
-  const _fileMap = collection.files
-    ? /** @type {FileCollection} */ (collection)._fileMap
-    : undefined;
-
-  if (!_fileMap) {
-    // It’s an entry collection
-    return [];
-  }
-
-  return Object.values(_fileMap).filter(
-    ({ _file, _i18n }) => _file.fullPath === entry.locales[_i18n.defaultLocale]?.path,
-  );
-};
-
-/**
- * Get a file collection entry that matches the given collection name and file name.
- * @param {string} collectionName - Collection name.
- * @param {string} fileName - File name.
- * @returns {Entry | undefined} File.
- * @see https://decapcms.org/docs/collection-types/#file-collections
- */
-export const getFile = (collectionName, fileName) =>
-  get(allEntries).find((entry) =>
-    getCollectionsByEntry(entry).some(
-      (collection) =>
-        collection.name === collectionName &&
-        getFilesByEntry(collection, entry).some((file) => file.name === fileName),
-    ),
-  );
-
-/**
- * Get entries by the given collection name, while applying a filer if needed.
- * @param {string} collectionName - Collection name.
- * @returns {Entry[]} Entries.
- * @see https://decapcms.org/docs/collection-types#filtered-folder-collections
- */
-export const getEntriesByCollection = (collectionName) => {
-  const collection = getCollection(collectionName);
-
-  if (!collection) {
-    return [];
-  }
-
-  const {
-    filter,
-    _i18n: { defaultLocale: locale },
-  } = collection;
-
-  const filterField = filter?.field;
-
-  const filterPattern =
-    typeof filter?.pattern === 'string' ? new RegExp(filter.pattern) : undefined;
-
-  const filterValues =
-    filter?.value === undefined ? [] : Array.isArray(filter.value) ? filter.value : [filter.value];
-
-  return get(allEntries).filter((entry) => {
-    if (!getCollectionsByEntry(entry).some(({ name }) => name === collectionName)) {
-      return false;
-    }
-
-    if (!filterField) {
-      return true;
-    }
-
-    const value = getPropertyValue({ entry, locale, collectionName, key: filterField }) ?? null;
-
-    if (filterPattern) {
-      return filterPattern.test(value);
-    }
-
-    return filterValues.includes(value);
-  });
-};
-
-/**
- * Find entries by an asset URL, and replace the URL if needed.
- * @param {string} url - Asset’s public or blob URL.
- * @param {object} [options] - Options.
- * @param {Entry[]} [options.entries] - Entries to be searched.
- * @param {string} [options.newURL] - New URL to replace the found URL.
- * @returns {Promise<Entry[]>} Found (and replaced) entries.
- */
-export const getEntriesByAssetURL = async (
-  url,
-  { entries = get(allEntries), newURL = '' } = {},
-) => {
-  const siteURL = get(siteConfig)?.site_url;
-  const assetURL = siteURL && !url.startsWith('blob:') ? url.replace(siteURL, '') : url;
-
-  const results = await Promise.all(
-    entries.map(async (entry) => {
-      const { locales } = entry;
-      const collections = getCollectionsByEntry(entry);
-
-      const _results = await Promise.all(
-        Object.values(locales).map(async ({ content }) => {
-          const __results = await Promise.all(
-            Object.entries(content).map(async ([keyPath, value]) => {
-              if (typeof value !== 'string' || !value) {
-                return false;
-              }
-
-              const ___results = await Promise.all(
-                collections.map(async (collection) => {
-                  /**
-                   * Check if the field contains the asset.
-                   * @param {CollectionFile} [collectionFile] - File. File collection only.
-                   * @returns {Promise<boolean>} Result.
-                   */
-                  const hasAsset = async (collectionFile) => {
-                    const field = getFieldConfig({
-                      collectionName: collection.name,
-                      fileName: collectionFile?.name,
-                      valueMap: content,
-                      keyPath,
-                    });
-
-                    if (!field) {
-                      return false;
-                    }
-
-                    const { widget: widgetName = 'string' } = field;
-
-                    if (['image', 'file'].includes(widgetName)) {
-                      const match = (await getMediaFieldURL(value, entry)) === assetURL;
-
-                      if (match && newURL) {
-                        content[keyPath] = newURL;
-                      }
-
-                      return match;
-                    }
-
-                    // Search images in markdown body
-                    if (widgetName === 'markdown') {
-                      const matches = [...value.matchAll(markdownImageRegEx)];
-
-                      if (matches.length) {
-                        return (
-                          await Promise.all(
-                            matches.map(async ([, src]) => {
-                              const match = (await getMediaFieldURL(src, entry)) === assetURL;
-
-                              if (match && newURL) {
-                                content[keyPath] = content[keyPath].replace(src, newURL);
-                              }
-
-                              return match;
-                            }),
-                          )
-                        ).some(Boolean);
-                      }
-                    }
-
-                    return false;
-                  };
-
-                  const collectionFiles = getFilesByEntry(collection, entry);
-
-                  if (collectionFiles.length) {
-                    return (await Promise.all(collectionFiles.map(hasAsset))).includes(true);
-                  }
-
-                  return hasAsset();
-                }),
-              );
-
-              return ___results.includes(true);
-            }),
-          );
-
-          return __results.includes(true);
-        }),
-      );
-
-      return _results.includes(true);
-    }),
-  );
-
-  return entries.filter((_entry, index) => results[index]);
-};
diff --git a/src/lib/components/contents/details/widgets/date-time/helper.js b/src/lib/services/contents/widgets/date-time.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/date-time/helper.js
rename to src/lib/services/contents/widgets/date-time.js
diff --git a/src/lib/components/contents/details/widgets/hidden/helper.js b/src/lib/services/contents/widgets/hidden.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/hidden/helper.js
rename to src/lib/services/contents/widgets/hidden.js
diff --git a/src/lib/components/contents/details/widgets/list/helper.js b/src/lib/services/contents/widgets/list.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/list/helper.js
rename to src/lib/services/contents/widgets/list.js
diff --git a/src/lib/components/contents/details/widgets/list/helper.spec.js b/src/lib/services/contents/widgets/list.spec.js
similarity index 98%
rename from src/lib/components/contents/details/widgets/list/helper.spec.js
rename to src/lib/services/contents/widgets/list.spec.js
index 6bb38dbb..dc84cdcd 100644
--- a/src/lib/components/contents/details/widgets/list/helper.spec.js
+++ b/src/lib/services/contents/widgets/list.spec.js
@@ -1,6 +1,6 @@
 import { writable } from 'svelte/store';
 import { describe, expect, test, vi } from 'vitest';
-import { formatSummary } from '$lib/components/contents/details/widgets/list/helper';
+import { formatSummary } from '$lib/services/contents/widgets/list';
 
 describe('Test formatSummary() — multiple fields', () => {
   const valueMap = {
diff --git a/src/lib/components/contents/details/widgets/markdown/component.js b/src/lib/services/contents/widgets/markdown/component.js
similarity index 97%
rename from src/lib/components/contents/details/widgets/markdown/component.js
rename to src/lib/services/contents/widgets/markdown/component.js
index 1f6ec418..3a8a4cbf 100644
--- a/src/lib/components/contents/details/widgets/markdown/component.js
+++ b/src/lib/services/contents/widgets/markdown/component.js
@@ -4,7 +4,7 @@ import { DecoratorNode, getNearestEditorFromDOMNode } from 'lexical';
 import { flushSync, mount } from 'svelte';
 import { _ } from 'svelte-i18n';
 import { get } from 'svelte/store';
-import Component from './component.svelte';
+import Component from '$lib/components/contents/details/widgets/markdown/component.svelte';
 
 /**
  * @typedef {object} CustomNodeFeatures
@@ -318,7 +318,7 @@ const getCustomNodeFeatures = ({ id, label, fields, pattern, fromBlock, toBlock,
  * does not match registered node CustomNode with the same type”.
  * @type {Map<string, CustomNodeFeatures>}
  */
-const featureCache = new Map();
+const featureCacheMap = new Map();
 
 /**
  * Text editor component implementation.
@@ -330,11 +330,11 @@ export class EditorComponent {
    */
   constructor(componentDef) {
     const { id } = componentDef;
-    const cache = featureCache.get(id);
+    const cache = featureCacheMap.get(id);
     const features = cache ?? getCustomNodeFeatures(componentDef);
 
     if (!cache) {
-      featureCache.set(id, features);
+      featureCacheMap.set(id, features);
     }
 
     Object.assign(this, { ...componentDef, ...features });
diff --git a/src/lib/components/contents/details/widgets/markdown/index.js b/src/lib/services/contents/widgets/markdown/index.js
similarity index 99%
rename from src/lib/components/contents/details/widgets/markdown/index.js
rename to src/lib/services/contents/widgets/markdown/index.js
index 680f4752..f6b29935 100644
--- a/src/lib/components/contents/details/widgets/markdown/index.js
+++ b/src/lib/services/contents/widgets/markdown/index.js
@@ -2,6 +2,7 @@
  * The default `modes` property options.
  */
 export const defaultModes = ['rich_text', 'raw'];
+
 /**
  * Key is a name used in Netlify/Decap CMS, value is a name used in Sveltia UI.
  * @type {Record<string, import("@sveltia/ui").TextEditorMode>}
@@ -10,6 +11,7 @@ export const modeNameMap = {
   rich_text: 'rich-text',
   raw: 'plain-text',
 };
+
 /**
  * The default `buttons` property options.
  */
@@ -28,6 +30,7 @@ export const defaultButtons = [
   'numbered-list',
   'quote',
 ];
+
 /**
  * Key is a name used in Netlify/Decap CMS, value is a name used in Sveltia UI.
  * @type {Record<string, import("@sveltia/ui").TextEditorInlineType |
diff --git a/src/lib/components/contents/details/widgets/object/helper.js b/src/lib/services/contents/widgets/object.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/object/helper.js
rename to src/lib/services/contents/widgets/object.js
diff --git a/src/lib/components/contents/details/widgets/object/helper.spec.js b/src/lib/services/contents/widgets/object.spec.js
similarity index 97%
rename from src/lib/components/contents/details/widgets/object/helper.spec.js
rename to src/lib/services/contents/widgets/object.spec.js
index 23b50a78..c6c883e2 100644
--- a/src/lib/components/contents/details/widgets/object/helper.spec.js
+++ b/src/lib/services/contents/widgets/object.spec.js
@@ -1,6 +1,6 @@
 import { writable } from 'svelte/store';
 import { describe, expect, test, vi } from 'vitest';
-import { formatSummary } from '$lib/components/contents/details/widgets/object/helper';
+import { formatSummary } from '$lib/services/contents/widgets/object';
 
 describe('Test formatSummary()', () => {
   const valueMap = {
diff --git a/src/lib/components/contents/details/widgets/relation/helper.js b/src/lib/services/contents/widgets/relation.js
similarity index 97%
rename from src/lib/components/contents/details/widgets/relation/helper.js
rename to src/lib/services/contents/widgets/relation.js
index 2ba05db1..2bff8359 100644
--- a/src/lib/components/contents/details/widgets/relation/helper.js
+++ b/src/lib/services/contents/widgets/relation.js
@@ -2,7 +2,7 @@ import { unique } from '@sveltia/utils/array';
 import { compare, escapeRegExp } from '@sveltia/utils/string';
 import { unflatten } from 'flat';
 import { getFieldConfig } from '$lib/services/contents/entry';
-import { getEntriesByCollection } from '$lib/services/contents';
+import { getEntriesByCollection } from '$lib/services/contents/collection/entries';
 
 /**
  * Enclose the given field name in brackets if it doesn’t contain any brackets.
@@ -15,7 +15,7 @@ const normalizeFieldName = (fieldName) =>
 /**
  * @type {Map<string, { label: string, value: any }[]>}
  */
-const optionCache = new Map();
+const optionCacheMap = new Map();
 
 /**
  * Get options for a Relation field.
@@ -26,7 +26,7 @@ const optionCache = new Map();
  */
 export const getOptions = (locale, fieldConfig, refEntries) => {
   const cacheKey = JSON.stringify({ locale, fieldConfig, refEntries });
-  const cache = optionCache.get(cacheKey);
+  const cache = optionCacheMap.get(cacheKey);
 
   if (cache) {
     return cache;
@@ -196,7 +196,7 @@ export const getOptions = (locale, fieldConfig, refEntries) => {
     .flat(1)
     .sort((a, b) => compare(a.label, b.label));
 
-  optionCache.set(cacheKey, options);
+  optionCacheMap.set(cacheKey, options);
 
   return options;
 };
diff --git a/src/lib/components/contents/details/widgets/relation/helper.spec.js b/src/lib/services/contents/widgets/relation.spec.js
similarity index 99%
rename from src/lib/components/contents/details/widgets/relation/helper.spec.js
rename to src/lib/services/contents/widgets/relation.spec.js
index 9f0fc453..1d65f01f 100644
--- a/src/lib/components/contents/details/widgets/relation/helper.spec.js
+++ b/src/lib/services/contents/widgets/relation.spec.js
@@ -1,7 +1,7 @@
 import { flatten } from 'flat';
 import { describe, expect, test } from 'vitest';
-import { getOptions } from '$lib/components/contents/details/widgets/relation/helper';
 import { siteConfig } from '$lib/services/config';
+import { getOptions } from '$lib/services/contents/widgets/relation';
 
 describe('Test getOptions()', () => {
   const locale = '_default';
diff --git a/src/lib/components/contents/details/widgets/select/helper.js b/src/lib/services/contents/widgets/select.js
similarity index 90%
rename from src/lib/components/contents/details/widgets/select/helper.js
rename to src/lib/services/contents/widgets/select.js
index 20fb024e..2c1679ec 100644
--- a/src/lib/components/contents/details/widgets/select/helper.js
+++ b/src/lib/services/contents/widgets/select.js
@@ -4,7 +4,7 @@ import { escapeRegExp } from '@sveltia/utils/string';
 /**
  * @type {Map<string, any | any[]>}
  */
-const labelCache = new Map();
+const labelCacheMap = new Map();
 
 /**
  * Get the display value for an option.
@@ -16,7 +16,7 @@ const labelCache = new Map();
  */
 export const getOptionLabel = ({ fieldConfig, valueMap, keyPath }) => {
   const cacheKey = JSON.stringify({ fieldConfig, valueMap, keyPath });
-  const cache = labelCache.get(cacheKey);
+  const cache = labelCacheMap.get(cacheKey);
 
   if (cache) {
     return cache;
@@ -41,7 +41,7 @@ export const getOptionLabel = ({ fieldConfig, valueMap, keyPath }) => {
 
     const labels = hasLabels ? values.map(getLabel) : values;
 
-    labelCache.set(cacheKey, labels);
+    labelCacheMap.set(cacheKey, labels);
 
     return labels;
   }
@@ -49,7 +49,7 @@ export const getOptionLabel = ({ fieldConfig, valueMap, keyPath }) => {
   const value = valueMap[keyPath];
   const label = hasLabels ? getLabel(value) : value;
 
-  labelCache.set(cacheKey, label);
+  labelCacheMap.set(cacheKey, label);
 
   return label;
 };
diff --git a/src/lib/components/contents/details/widgets/string/helper.js b/src/lib/services/contents/widgets/string.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/string/helper.js
rename to src/lib/services/contents/widgets/string.js
diff --git a/src/lib/components/contents/details/widgets/uuid/helper.js b/src/lib/services/contents/widgets/uuid.js
similarity index 100%
rename from src/lib/components/contents/details/widgets/uuid/helper.js
rename to src/lib/services/contents/widgets/uuid.js
diff --git a/src/lib/services/search.js b/src/lib/services/search.js
index f331119c..4e37cad0 100644
--- a/src/lib/services/search.js
+++ b/src/lib/services/search.js
@@ -1,6 +1,8 @@
 import { derived, writable } from 'svelte/store';
 import { allAssets } from '$lib/services/assets';
-import { allEntries, getCollectionsByEntry, getFilesByEntry } from '$lib/services/contents';
+import { allEntries } from '$lib/services/contents';
+import { getCollectionsByEntry } from '$lib/services/contents/collection';
+import { getFilesByEntry } from '$lib/services/contents/collection/files';
 
 /**
  * @type {import('svelte/store').Writable<string>}
diff --git a/src/main.js b/src/main.js
index 696e644a..50d6a711 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,6 +1,6 @@
 import { mount } from 'svelte';
-import { registeredComponents } from '$lib/components/contents/details/widgets/markdown';
 import { customFileFormats } from '$lib/services/contents/file';
+import { registeredComponents } from '$lib/services/contents/widgets/markdown';
 import App from './app.svelte';
 
 const knownFuncNames = [