diff --git a/src/services/dictionary-test/dictionary-test.ts b/src/services/dictionary-test/dictionary-test.ts
index 0ceb233a..8598fdd3 100644
--- a/src/services/dictionary-test/dictionary-test.ts
+++ b/src/services/dictionary-test/dictionary-test.ts
@@ -1,11 +1,14 @@
 import * as fs from 'fs'
 
-import { Dictionary } from 'services'
+import { Dictionary, IBasicData } from 'services'
 
-import basicData from './basic.json'
+import testData from './basic.json'
 import { deepDiffMapper } from './deepDiffMapper'
 import testSnapshot from './snapshot.json'
 
+const basicData = testData as unknown as IBasicData
+
+
 Dictionary.init(basicData.wordList, basicData.searchIndex)
 
 const snapshot = {}
diff --git a/src/services/dictionary.ts b/src/services/dictionary.ts
index af7789b2..f5b5fa15 100644
--- a/src/services/dictionary.ts
+++ b/src/services/dictionary.ts
@@ -158,6 +158,9 @@ export interface ITranslateResult {
 export const ISV_SRC = 'isv-src'
 export const ISV = 'isv'
 
+export type WordList = string[][]
+export type SearchIndex = Record<string, Array<[string, string[]]>>
+
 class DictionaryClass {
     public static getInstance(): DictionaryClass {
         if (!DictionaryClass.instance) {
@@ -173,7 +176,7 @@ class DictionaryClass {
     private langsList: string[]
     private headerIndexes: Map<string, number>
     private percentsOfChecked: {[lang: string]: string}
-    private words: string[][]
+    private words: WordList
     private splittedMap: {[lang: string]: Map<string, string[]>}
     private isvSearchLetters: { from: string[], to: string[] }
     private isvSearchByWordForms: boolean
@@ -188,9 +191,9 @@ class DictionaryClass {
     }
 
     public init(
-        wordList: string[][],
-        searchIndex?: any | false,
-        percentsOfChecked?: any,
+        wordList: WordList,
+        searchIndex?: SearchIndex,
+        percentsOfChecked?: Record<string, string>,
     ): number {
         let startInitTime = 0
 
@@ -284,7 +287,7 @@ class DictionaryClass {
 
         return initTime
     }
-    public addLang(wordList: string[], searchIndex?: any) {
+    public addLang(wordList: string[], searchIndex?: SearchIndex) {
         const lang = wordList[0]
 
         if (this.hasLang(lang)) {
@@ -303,7 +306,7 @@ class DictionaryClass {
     public hasLang(lang): boolean {
         return this.headerIndexes.has(lang)
     }
-    public getWordList(): string[][] {
+    public getWordList(): WordList {
         return this.words
     }
     public getWord(wordId: string) {
@@ -311,7 +314,7 @@ class DictionaryClass {
             return this.words.filter((line) => this.getField(line, 'id') === wordId)[0]
         }
     }
-    public getIndex() {
+    public getIndex(): SearchIndex {
         const searchIndex = {};
 
         [
@@ -326,7 +329,7 @@ class DictionaryClass {
 
         return searchIndex
     }
-    public translate(translateParams: ITranslateParams, showTime = true): [string[][], number] {
+    public translate(translateParams: ITranslateParams, showTime = true): [WordList, number] {
         const {
             inputText,
             from,
@@ -517,7 +520,7 @@ class DictionaryClass {
     }
 
     public formatTranslate(
-        results: string[][],
+        results: WordList,
         from: string,
         to: string,
         flavorisationType: string,
diff --git a/src/services/fetchDictionary.ts b/src/services/fetchDictionary.ts
index bd90d281..25758efd 100644
--- a/src/services/fetchDictionary.ts
+++ b/src/services/fetchDictionary.ts
@@ -2,7 +2,7 @@ import { addLangs } from 'consts'
 
 import { isLoadingAction, runSearch } from 'actions'
 
-import { Dictionary } from 'services'
+import { Dictionary, SearchIndex, WordList } from 'services'
 
 async function fetchStat() {
     return fetch('data/translateStatistic.json').then((res) => res.json()).then((data) => data)
@@ -14,7 +14,12 @@ async function fetchLangs(langList: string[]) {
     )
 }
 
-async function fetchBasic() {
+export interface IBasicData {
+    wordList: WordList,
+    searchIndex?: SearchIndex,
+}
+
+async function fetchBasic(): Promise<IBasicData> {
     return await fetch('data/basic.json').then((res) => res.json())
 }