diff --git a/rsconcept/frontend/src/app/urls.ts b/rsconcept/frontend/src/app/urls.ts
index 996b192e..d5ce6e11 100644
--- a/rsconcept/frontend/src/app/urls.ts
+++ b/rsconcept/frontend/src/app/urls.ts
@@ -4,9 +4,7 @@
 
 import { buildConstants } from '@/utils/build-constants';
 
-/**
- * Routes.
- */
+/** Routes. */
 export const routes = {
   not_found: 'not-found',
   login: 'login',
@@ -22,11 +20,9 @@ export const routes = {
   oss: 'oss',
   icons: 'icons',
   database_schema: 'database-schema'
-};
+} as const;
 
-/**
- * Internal navigation URLs.
- */
+/** Internal navigation URLs. */
 export const urls = {
   page404: '/not-found',
   admin: `${buildConstants.backend}/admin`,
@@ -66,4 +62,4 @@ export const urls = {
   oss_props: ({ id, tab }: { id: number | string; tab: number }) => {
     return `/oss/${id}?tab=${tab}`;
   }
-};
+} as const;
diff --git a/rsconcept/frontend/src/backend/configuration.ts b/rsconcept/frontend/src/backend/configuration.ts
index d0d42d44..efa5c4fa 100644
--- a/rsconcept/frontend/src/backend/configuration.ts
+++ b/rsconcept/frontend/src/backend/configuration.ts
@@ -6,7 +6,7 @@ export const DELAYS = {
   staleShort: 5 * 60 * 1000,
   staleMedium: 1 * 60 * 60 * 1000,
   staleLong: 24 * 60 * 60 * 1000
-};
+} as const;
 
 /** API keys for local cache. */
 export const KEYS = {
@@ -19,8 +19,8 @@ export const KEYS = {
   global_mutation: 'global_mutation',
 
   composite: {
-    libraryList: ['library', 'list'],
+    libraryList: ['library', 'list'] as const,
     ossItem: ({ itemID }: { itemID?: number }) => [KEYS.oss, 'item', itemID],
     rsItem: ({ itemID, version }: { itemID?: number; version?: number }) => [KEYS.rsform, 'item', itemID, version ?? '']
   }
-};
+} as const;
diff --git a/rsconcept/frontend/src/components/data-table/data-table.tsx b/rsconcept/frontend/src/components/data-table/data-table.tsx
index 5653905f..cbdf7dd7 100644
--- a/rsconcept/frontend/src/components/data-table/data-table.tsx
+++ b/rsconcept/frontend/src/components/data-table/data-table.tsx
@@ -78,7 +78,7 @@ export interface DataTableProps<TData extends RowData>
   paginationPerPage?: number;
 
   /** List of options to choose from for pagination. */
-  paginationOptions?: number[];
+  paginationOptions?: readonly number[];
 
   /** Callback to be called when the pagination option is changed. */
   onChangePaginationOption?: (newValue: number) => void;
diff --git a/rsconcept/frontend/src/components/data-table/pagination-tools.tsx b/rsconcept/frontend/src/components/data-table/pagination-tools.tsx
index 3f0ee03b..3ec602a1 100644
--- a/rsconcept/frontend/src/components/data-table/pagination-tools.tsx
+++ b/rsconcept/frontend/src/components/data-table/pagination-tools.tsx
@@ -10,7 +10,7 @@ import { SelectPagination } from './select-pagination';
 interface PaginationToolsProps<TData> {
   id?: string;
   table: Table<TData>;
-  paginationOptions: number[];
+  paginationOptions: readonly number[];
   onChangePaginationOption?: (newValue: number) => void;
 }
 
diff --git a/rsconcept/frontend/src/components/data-table/select-pagination.tsx b/rsconcept/frontend/src/components/data-table/select-pagination.tsx
index a304f1a9..58aea9ff 100644
--- a/rsconcept/frontend/src/components/data-table/select-pagination.tsx
+++ b/rsconcept/frontend/src/components/data-table/select-pagination.tsx
@@ -11,7 +11,7 @@ import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '.
 interface SelectPaginationProps<TData> {
   id?: string;
   table: Table<TData>;
-  paginationOptions: number[];
+  paginationOptions: readonly number[];
   onChange?: (newValue: number) => void;
 }
 
diff --git a/rsconcept/frontend/src/features/auth/backend/api.ts b/rsconcept/frontend/src/features/auth/backend/api.ts
index 343c4761..e541ed19 100644
--- a/rsconcept/frontend/src/features/auth/backend/api.ts
+++ b/rsconcept/frontend/src/features/auth/backend/api.ts
@@ -61,4 +61,4 @@ export const authApi = {
       endpoint: '/users/api/password-reset/confirm',
       request: { data: data }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/library/backend/api.ts b/rsconcept/frontend/src/features/library/backend/api.ts
index 03927291..11967334 100644
--- a/rsconcept/frontend/src/features/library/backend/api.ts
+++ b/rsconcept/frontend/src/features/library/backend/api.ts
@@ -169,4 +169,4 @@ export const libraryApi = {
         successMessage: infoMsg.versionDestroyed
       }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/oss/backend/api.ts b/rsconcept/frontend/src/features/oss/backend/api.ts
index 69d7da8f..dcf08b8b 100644
--- a/rsconcept/frontend/src/features/oss/backend/api.ts
+++ b/rsconcept/frontend/src/features/oss/backend/api.ts
@@ -164,4 +164,4 @@ export const ossApi = {
       endpoint: '/api/oss/get-predecessor',
       request: { data: { target: cstID } }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/oss/pages/oss-page/editor-oss-graph/graph/oss-node-types.ts b/rsconcept/frontend/src/features/oss/pages/oss-page/editor-oss-graph/graph/oss-node-types.ts
index 79bc87cb..376a6701 100644
--- a/rsconcept/frontend/src/features/oss/pages/oss-page/editor-oss-graph/graph/oss-node-types.ts
+++ b/rsconcept/frontend/src/features/oss/pages/oss-page/editor-oss-graph/graph/oss-node-types.ts
@@ -8,4 +8,4 @@ export const OssNodeTypes: NodeTypes = {
   synthesis: OperationNode,
   input: InputNode,
   block: BlockNode
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/backend/api.ts b/rsconcept/frontend/src/features/rsform/backend/api.ts
index 6abb36fc..cb3415a5 100644
--- a/rsconcept/frontend/src/features/rsform/backend/api.ts
+++ b/rsconcept/frontend/src/features/rsform/backend/api.ts
@@ -153,4 +153,4 @@ export const rsformsApi = {
       endpoint: `/api/rsforms/${itemID}/check-constituenta`,
       request: { data: data }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/backend/cctext/api.ts b/rsconcept/frontend/src/features/rsform/backend/cctext/api.ts
index 86c05ff7..688af430 100644
--- a/rsconcept/frontend/src/features/rsform/backend/cctext/api.ts
+++ b/rsconcept/frontend/src/features/rsform/backend/cctext/api.ts
@@ -30,4 +30,4 @@ export const cctextApi = {
       endpoint: '/api/cctext/generate-lexeme',
       request: { data: data }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/colors.ts b/rsconcept/frontend/src/features/rsform/colors.ts
index f10a6e7d..505d8ba5 100644
--- a/rsconcept/frontend/src/features/rsform/colors.ts
+++ b/rsconcept/frontend/src/features/rsform/colors.ts
@@ -17,7 +17,7 @@ export const BRACKETS_THEME = {
     backgroundColor: APP_COLORS.bgSelected,
     color: APP_COLORS.fgSelected
   }
-};
+} as const;
 
 /** Determines background color for {@link ISyntaxTreeNode} based on its type. */
 export function colorBgSyntaxTree(node: ISyntaxTreeNode): string {
diff --git a/rsconcept/frontend/src/features/rsform/components/refs-input/parse/index.ts b/rsconcept/frontend/src/features/rsform/components/refs-input/parse/index.ts
index 4cc556f7..92a33a2a 100644
--- a/rsconcept/frontend/src/features/rsform/components/refs-input/parse/index.ts
+++ b/rsconcept/frontend/src/features/rsform/components/refs-input/parse/index.ts
@@ -3,7 +3,7 @@ import { LRLanguage } from '@codemirror/language';
 import { parser } from './parser';
 import { RefEntity, RefSyntactic } from './parser.terms';
 
-export const ReferenceTokens: number[] = [RefSyntactic, RefEntity];
+export const ReferenceTokens = [RefSyntactic, RefEntity] as const;
 
 export const NaturalLanguage = LRLanguage.define({
   parser: parser,
diff --git a/rsconcept/frontend/src/features/rsform/components/rs-input/rslang/index.ts b/rsconcept/frontend/src/features/rsform/components/rs-input/rslang/index.ts
index de4efece..2ebf28d2 100644
--- a/rsconcept/frontend/src/features/rsform/components/rs-input/rslang/index.ts
+++ b/rsconcept/frontend/src/features/rsform/components/rs-input/rslang/index.ts
@@ -3,7 +3,7 @@ import { LRLanguage } from '@codemirror/language';
 import { parser } from './parser';
 import { Function, Global, Predicate } from './parser.terms';
 
-export const GlobalTokens: number[] = [Global, Function, Predicate];
+export const GlobalTokens = [Global, Function, Predicate] as const;
 
 export const RSLanguage = LRLanguage.define({
   parser: parser,
diff --git a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-edge-types.ts b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-edge-types.ts
index 86b1ef3e..15d10da6 100644
--- a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-edge-types.ts
+++ b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-edge-types.ts
@@ -4,4 +4,4 @@ import { DynamicEdge } from '@/components/flow/dynamic-edge';
 
 export const ASTEdgeTypes: EdgeTypes = {
   dynamic: DynamicEdge
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-node-types.ts b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-node-types.ts
index 9e612cc8..5168f820 100644
--- a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-node-types.ts
+++ b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-ast/graph/ast-node-types.ts
@@ -4,4 +4,4 @@ import { ASTNode } from './ast-node';
 
 export const ASTNodeTypes: NodeTypes = {
   token: ASTNode
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-edge-types.ts b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-edge-types.ts
index 2e51a235..125901d7 100644
--- a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-edge-types.ts
+++ b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-edge-types.ts
@@ -6,4 +6,4 @@ import { CartesianEdge } from './cartesian-edge';
 export const TMGraphEdgeTypes: EdgeTypes = {
   boolean: BooleanEdge,
   cartesian: CartesianEdge
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-node-types.ts b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-node-types.ts
index ced4d5b2..39de2b5e 100644
--- a/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-node-types.ts
+++ b/rsconcept/frontend/src/features/rsform/dialogs/dlg-show-type-graph/graph/mgraph-node-types.ts
@@ -4,4 +4,4 @@ import { MGraphNode } from './mgraph-node';
 
 export const TMGraphNodeTypes: NodeTypes = {
   step: MGraphNode
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-edge-types.ts b/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-edge-types.ts
index f2a8117f..92441f10 100644
--- a/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-edge-types.ts
+++ b/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-edge-types.ts
@@ -4,4 +4,4 @@ import { DynamicEdge } from '@/components/flow/dynamic-edge';
 
 export const TGEdgeTypes: EdgeTypes = {
   termEdge: DynamicEdge
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-node-types.ts b/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-node-types.ts
index 2ec5ccb6..06bde8e2 100644
--- a/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-node-types.ts
+++ b/rsconcept/frontend/src/features/rsform/pages/rsform-page/editor-term-graph/graph/tg-node-types.ts
@@ -4,4 +4,4 @@ import { TGNode } from './tg-node';
 
 export const TGNodeTypes: NodeTypes = {
   concept: TGNode
-};
+} as const;
diff --git a/rsconcept/frontend/src/features/users/backend/api.ts b/rsconcept/frontend/src/features/users/backend/api.ts
index 37bf0fda..f8d673b4 100644
--- a/rsconcept/frontend/src/features/users/backend/api.ts
+++ b/rsconcept/frontend/src/features/users/backend/api.ts
@@ -59,4 +59,4 @@ export const usersApi = {
         successMessage: infoMsg.changesSaved
       }
     })
-};
+} as const;
diff --git a/rsconcept/frontend/src/styling/colors.ts b/rsconcept/frontend/src/styling/colors.ts
index 8f7d5c00..262a3f95 100644
--- a/rsconcept/frontend/src/styling/colors.ts
+++ b/rsconcept/frontend/src/styling/colors.ts
@@ -36,4 +36,4 @@ export const APP_COLORS = {
   fgPurple:           'var(--acc-fg-purple)',
   fgTeal:             'var(--acc-fg-teal)',
   fgOrange:           'var(--acc-fg-orange)'
-}
+} as const
diff --git a/rsconcept/frontend/src/utils/build-constants.ts b/rsconcept/frontend/src/utils/build-constants.ts
index 27a86c5c..d34a4fb6 100644
--- a/rsconcept/frontend/src/utils/build-constants.ts
+++ b/rsconcept/frontend/src/utils/build-constants.ts
@@ -4,4 +4,4 @@
  */
 export const buildConstants = {
   backend: import.meta.env.VITE_PORTAL_BACKEND as string
-};
+} as const;
diff --git a/rsconcept/frontend/src/utils/codemirror.ts b/rsconcept/frontend/src/utils/codemirror.ts
index c5824e0b..be4357cc 100644
--- a/rsconcept/frontend/src/utils/codemirror.ts
+++ b/rsconcept/frontend/src/utils/codemirror.ts
@@ -72,7 +72,12 @@ export function printTree(tree: Tree): string {
 }
 
 /** Retrieves a list of all nodes, containing given range and corresponding to a filter. */
-export function findEnvelopingNodes(start: number, finish: number, tree: Tree, filter?: number[]): SyntaxNode[] {
+export function findEnvelopingNodes(
+  start: number,
+  finish: number,
+  tree: Tree,
+  filter?: readonly number[]
+): SyntaxNode[] {
   const result: SyntaxNode[] = [];
   tree.cursor().iterate(node => {
     if ((!filter || filter.includes(node.type.id)) && node.to >= start && node.from <= finish) {
@@ -87,7 +92,12 @@ export function findEnvelopingNodes(start: number, finish: number, tree: Tree, f
 }
 
 /** Retrieves a list of all nodes, contained in given range and corresponding to a filter. */
-export function findContainedNodes(start: number, finish: number, tree: Tree, filter?: number[]): SyntaxNode[] {
+export function findContainedNodes(
+  start: number,
+  finish: number,
+  tree: Tree,
+  filter?: readonly number[]
+): SyntaxNode[] {
   const result: SyntaxNode[] = [];
   tree.cursor().iterate(node => {
     if ((!filter || filter.includes(node.type.id)) && node.to <= finish && node.from >= start) {
@@ -169,7 +179,7 @@ export class CodeMirrorWrapper {
   /**
    * Access list of SyntaxNodes contained in current selection.
    */
-  getContainedNodes(tokenFilter?: number[]): SyntaxNode[] {
+  getContainedNodes(tokenFilter?: readonly number[]): SyntaxNode[] {
     const selection = this.getSelection();
     return findContainedNodes(selection.from, selection.to, syntaxTree(this.ref.view.state), tokenFilter);
   }
@@ -177,7 +187,7 @@ export class CodeMirrorWrapper {
   /**
    * Access list of SyntaxNodes enveloping current selection.
    */
-  getEnvelopingNodes(tokenFilter?: number[]): SyntaxNode[] {
+  getEnvelopingNodes(tokenFilter?: readonly number[]): SyntaxNode[] {
     const selection = this.getSelection();
     return findEnvelopingNodes(selection.from, selection.to, syntaxTree(this.ref.view.state), tokenFilter);
   }
@@ -185,7 +195,7 @@ export class CodeMirrorWrapper {
   /**
    * Access list of SyntaxNodes contained in documents.
    */
-  getAllNodes(tokenFilter?: number[]): SyntaxNode[] {
+  getAllNodes(tokenFilter?: readonly number[]): SyntaxNode[] {
     return findContainedNodes(0, this.ref.view.state.doc.length, syntaxTree(this.ref.view.state), tokenFilter);
   }
 
@@ -194,7 +204,7 @@ export class CodeMirrorWrapper {
    *
    * If tokenFilter is provided then minimal valid token is selected.
    */
-  fixSelection(tokenFilter?: number[]) {
+  fixSelection(tokenFilter?: readonly number[]) {
     const selection = this.getSelection();
     if (tokenFilter) {
       const nodes = findEnvelopingNodes(selection.from, selection.to, syntaxTree(this.ref.view.state), tokenFilter);
diff --git a/rsconcept/frontend/src/utils/constants.ts b/rsconcept/frontend/src/utils/constants.ts
index 6afbc4c9..16b543d0 100644
--- a/rsconcept/frontend/src/utils/constants.ts
+++ b/rsconcept/frontend/src/utils/constants.ts
@@ -2,9 +2,7 @@
  * Module: Global constants.
  */
 
-/**
- * Global application Parameters. The place where magic numbers are put to rest.
- */
+/** Global application Parameters. The place where magic numbers are put to rest. */
 export const PARAMETER = {
   smallScreen: 640, // == tailwind:sm
 
@@ -26,46 +24,34 @@ export const PARAMETER = {
   logicLabel: 'LOGIC',
   errorNodeLabel: '[ERROR]',
   exteorVersion: '4.9.7'
-};
+} as const;
 
-/**
- * Numeric limitations.
- */
+/** Numeric limitations. */
 export const limits = {
   location_len: 500
-};
+} as const;
 
-/**
- * Exteor file extension for RSForm.
- */
+/** Exteor file extension for RSForm. */
 export const EXTEOR_TRS_FILE = '.trs';
 
-/**
- * Regex patterns for data validation.
- */
+/** Regex patterns for data validation. */
 export const patterns = {
   login: '^[a-zA-Z][a-zA-Z0-9_\\-]{1,}[a-zA-Z0-9]$'
-};
+} as const;
 
-/**
- * Local URIs.
- */
+/** Local URIs. */
 export const resources = {
   privacy_policy: '/privacy.pdf',
   logo: '/logo_full.svg',
   db_schema: '/db_schema.svg'
-};
+} as const;
 
-/**
- * Youtube IDs for embedding.
- */
+/** Youtube IDs for embedding. */
 export const youtube = {
   intro: '0Ty9mu9sOJo'
-};
+} as const;
 
-/**
- * External URLs.
- */
+/** External URLs. */
 export const external_urls = {
   concept: 'https://www.acconcept.ru/',
   exteor32: 'https://drive.google.com/open?id=1IHlMMwaYlAUBRSxU1RU_hXM5mFU9-oyK&usp=drive_fs',
@@ -81,11 +67,9 @@ export const external_urls = {
   git_cctext: 'https://github.com/IRBorisov/cctext',
   mail_portal: 'mailto:portal@acconcept.ru',
   restAPI: 'https://api.portal.acconcept.ru'
-};
+} as const;
 
-/**
- * Global element ID.
- */
+/** Global element ID. */
 export const globalIDs = {
   tooltip: 'global_tooltip',
   value_tooltip: 'value_tooltip',
@@ -96,11 +80,9 @@ export const globalIDs = {
   constituenta_editor: 'constituenta_editor',
   graph_schemas: 'graph_schemas_tooltip',
   user_dropdown: 'user_dropdown'
-};
+} as const;
 
-/**
- * Prefixes for generating unique keys for lists.
- */
+/** Prefixes for generating unique keys for lists. */
 export const prefixes = {
   page_size: 'page_size_',
   oss_list: 'oss_list_',
@@ -123,4 +105,4 @@ export const prefixes = {
   user_editors: 'user_editors_',
   wordform_list: 'wordform_list_',
   rsedit_btn: 'rsedit_btn_'
-};
+} as const;
diff --git a/rsconcept/frontend/src/utils/labels.ts b/rsconcept/frontend/src/utils/labels.ts
index 41d1cb5b..889bb01f 100644
--- a/rsconcept/frontend/src/utils/labels.ts
+++ b/rsconcept/frontend/src/utils/labels.ts
@@ -41,7 +41,7 @@ export const infoMsg = {
   operationExecuted: 'Операция выполнена',
   allOperationExecuted: 'Все операции выполнены',
   constituentsDestroyed: (count: number) => `Конституенты удалены: ${count}`
-};
+} as const;
 
 /**
  * UI error descriptors.
@@ -65,7 +65,7 @@ export const errorMsg = {
   emptySubstitutions: 'Выберите хотя бы одно отождествление',
   aliasInvalid: 'Введите незанятое имя, соответствующее типу',
   invalidResponse: 'Некорректный ответ сервера'
-};
+} as const;
 
 /**
  * UI tooltip descriptors.
@@ -73,7 +73,7 @@ export const errorMsg = {
 export const tooltipText = {
   unsaved: 'Сохраните или отмените изменения',
   shareItem: (isPublic: boolean) => (isPublic ? 'Поделиться схемой' : 'Поделиться можно только <br/>открытой схемой')
-};
+} as const;
 
 /**
  * UI prompt messages.
@@ -88,4 +88,4 @@ export const promptText = {
   restoreArchive: 'При восстановлении архивной версии актуальная схему будет заменена. Продолжить?',
   ownerChange:
     'Вы уверены, что хотите изменить владельца? Вы потеряете право управления данной схемой. Данное действие отменить нельзя'
-};
+} as const;