diff --git a/.eslintignore b/.eslintignore
index 63520da7..c2b4126b 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,3 +1,9 @@
 node_modules
 dist
+examples
+scripts
+tests/env
 build
+
+# temporary fix
+playgrounds/vanilla-js
diff --git a/.eslintrc.js b/.eslintrc.js
index 69de8773..2dbff557 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -10,11 +10,55 @@ module.exports = {
     context: true, // for jest/puppeteer tests in examples/express
     jestPuppeteer: true, // for jest/puppeteer tests in examples/express
   },
-  extends: ['standard', 'plugin:prettier/recommended'],
-  plugins: ['jest'],
+  extends: [
+    'standard',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'plugin:prettier/recommended',
+    'prettier/@typescript-eslint',
+  ],
+  parser: '@typescript-eslint/parser',
   parserOptions: {
-    ecmaVersion: 11,
+    ecmaVersion: 2020,
     sourceType: 'module',
+    project: ['tsconfig.eslint.json'],
+    projectFolderIgnoreList: ['dist'],
+  },
+  plugins: ['jsdoc', '@typescript-eslint', 'prettier', 'jest'],
+  rules: {
+    'no-dupe-class-members': 'off', // Off due to conflict with typescript overload functions
+    'prettier/prettier': ['error', {}, { usePrettierrc: true }],
+    '@typescript-eslint/array-type': ['warn', { default: 'array-simple' }],
+    '@typescript-eslint/return-await': 'off',
+    'jsdoc/check-alignment': 'error',
+    'jsdoc/check-indentation': 'error',
+    '@typescript-eslint/space-before-function-paren': 0,
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/no-throw-literal': 'off',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/no-unsafe-assignment': 'off',
+    '@typescript-eslint/no-unsafe-call': 'off',
+    '@typescript-eslint/no-unsafe-return': 'off',
+    '@typescript-eslint/no-unsafe-module-boundary-types': 'off',
+    '@typescript-eslint/prefer-regexp-exec': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-unnecessary-type-assertion': 'off',
+    '@typescript-eslint/no-unsafe-member-access': 'off',
+    '@typescript-eslint/ban-types': 'off',
+    '@typescript-eslint/member-delimiter-style': [
+      'error',
+      {
+        multiline: {
+          delimiter: 'none', // 'none' or 'semi' or 'comma'
+          requireLast: true,
+        },
+        singleline: {
+          delimiter: 'semi', // 'semi' or 'comma'
+          requireLast: false,
+        },
+      },
+    ],
+    'comma-dangle': 'off',
   },
-  rules: {},
 }
diff --git a/jest.config.js b/jest.config.js
index 845548de..2ba739c7 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,4 +1,6 @@
 module.exports = {
   verbose: true,
   modulePathIgnorePatterns: ['<rootDir>/examples'],
+  testMatch: ['<rootDir>/tests/**/*.ts?(x)'],
+  preset: 'ts-jest',
 }
diff --git a/package.json b/package.json
index 52132abe..2742f18b 100644
--- a/package.json
+++ b/package.json
@@ -4,26 +4,36 @@
   "private": false,
   "description": "The search client to use MeiliSearch with InstantSearch.",
   "scripts": {
+    "cleanup": "shx rm -rf dist/",
     "test": "jest",
     "test:demo": "yarn build && yarn test:demo:browser && yarn test:demo:nodejs && yarn test:demo:esm",
     "test:demo:browser": "yarn --cwd examples/express && yarn --cwd examples/express test",
     "test:demo:nodejs": "node examples/node/index.js",
     "test:demo:esm": "yarn --cwd examples/esm && yarn --cwd examples/esm start",
-    "build:playground:vue": "yarn --cwd ./playgrounds/vue && yarn --cwd ./playgrounds/vue build",
-    "build:playground:react": "yarn --cwd ./playgrounds/react && yarn --cwd ./playgrounds/react build",
-    "build:playground:vanilla-js": "yarn --cwd ./playgrounds/vanilla-js && yarn --cwd ./playgrounds/vanilla-js build",
+    "build:playground:vue": "yarn build && yarn --cwd ./playgrounds/vue && yarn --cwd ./playgrounds/vue build",
+    "build:playground:react": "yarn build && yarn --cwd ./playgrounds/react && yarn --cwd ./playgrounds/react build",
+    "build:playground:vanilla-js": "yarn build && yarn --cwd ./playgrounds/vanilla-js && yarn --cwd ./playgrounds/vanilla-js build",
     "test:all": "yarn test && yarn test:demo",
     "lint": "eslint --ext .js,.ts,.tsx,.vue .",
     "lint:fix": "eslint --ext .js,.ts,.tsx,.vue --fix .",
-    "build": "rollup -c rollup.config.js && rollup --environment NODE_ENV:production -c rollup.config.js ",
-    "playground:vue": "yarn --cwd ./playgrounds/vue && yarn --cwd ./playgrounds/vue serve",
-    "playground:react": "yarn --cwd ./playgrounds/react && yarn --cwd ./playgrounds/react start",
-    "playground:vanilla-js": "yarn --cwd ./playgrounds/vanilla-js && yarn --cwd ./playgrounds/vanilla-js start"
+    "build": "yarn cleanup && rollup -c rollup.config.js && rollup --environment NODE_ENV:production -c rollup.config.js ",
+    "postbuild": "yarn typingsheader",
+    "playground:vue": "yarn build && yarn --cwd ./playgrounds/vue && yarn --cwd ./playgrounds/vue serve",
+    "playground:react": "yarn build && yarn --cwd ./playgrounds/react && yarn --cwd ./playgrounds/react start",
+    "playground:vanilla-js": "yarn build && yarn --cwd ./playgrounds/vanilla-js && yarn --cwd ./playgrounds/vanilla-js start",
+    "typingsheader": "node scripts/build.js"
   },
   "main": "./dist/instant-meilisearch.umd.js",
   "module": "./dist/instant-meilisearch.esm.js",
   "browser": "./dist/instant-meilisearch.umd.js",
   "cjs": "./dist/instant-meilisearch.cjs.js",
+  "source": "src/index.ts",
+  "typings": "./dist/types/index.d.ts",
+  "types": "./dist/types/index.d.ts",
+  "sideEffects": false,
+  "bugs": {
+    "url": "https://github.com/meilisearch/instant-meilisearch/issues"
+  },
   "files": [
     "dist",
     "src"
@@ -40,7 +50,7 @@
     "url": "https://github.com/meilisearch/instant-meilisearch.git"
   },
   "dependencies": {
-    "meilisearch": "^0.16.0"
+    "meilisearch": "^0.16.1"
   },
   "devDependencies": {
     "@babel/cli": "^7.10.5",
@@ -59,6 +69,7 @@
     "eslint-plugin-flowtype": "^5.2.0",
     "eslint-plugin-import": "^2.22.0",
     "eslint-plugin-jest": "^24.0.0",
+    "eslint-plugin-jsdoc": "^30.7.7",
     "eslint-plugin-jsx-a11y": "^6.4.1",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.1.4",
@@ -74,6 +85,9 @@
     "rollup": "^2.23.0",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-terser": "^7.0.0",
+    "rollup-plugin-typescript2": "^0.29.0",
+    "shx": "^0.3.3",
+    "ts-jest": "^26.4.4",
     "typescript": "^4.0.0"
   }
 }
diff --git a/playgrounds/react/src/instant-meilisearch.js b/playgrounds/react/src/instant-meilisearch.js
index f9ccdd19..c75a55c0 120000
--- a/playgrounds/react/src/instant-meilisearch.js
+++ b/playgrounds/react/src/instant-meilisearch.js
@@ -1 +1 @@
-../../../src/index.js
\ No newline at end of file
+../../../dist/instant-meilisearch.esm.js
\ No newline at end of file
diff --git a/playgrounds/vue/.eslintignore b/playgrounds/vue/.eslintignore
new file mode 100644
index 00000000..e8e65946
--- /dev/null
+++ b/playgrounds/vue/.eslintignore
@@ -0,0 +1,5 @@
+node_modules
+dist
+examples
+scripts
+tests/env
diff --git a/playgrounds/vue/src/App.vue b/playgrounds/vue/src/App.vue
index 27183b4e..8ff83d07 100644
--- a/playgrounds/vue/src/App.vue
+++ b/playgrounds/vue/src/App.vue
@@ -5,40 +5,43 @@
       <p class="header-subtitle">Search in Steam video games 🎮</p>
     </header>
     <p class="disclaimer">
-      This is not the official Steam dataset but only for demo purpose.
-      Enjoy searching with MeiliSearch!
+      This is not the official Steam dataset but only for demo purpose. Enjoy
+      searching with MeiliSearch!
     </p>
     <div class="container">
-      <ais-instant-search :search-client="searchClient" index-name="steam-video-games">
+      <ais-instant-search
+        :search-client="searchClient"
+        index-name="steam-video-games"
+      >
         <div class="search-panel__filters">
           <ais-clear-refinements>
             <span slot="resetLabel">Clear all filters</span>
           </ais-clear-refinements>
           <h2>Genres</h2>
-          <ais-refinement-list attribute="genres"/>
+          <ais-refinement-list attribute="genres" />
           <h2>Players</h2>
-          <ais-refinement-list attribute="players"/>
+          <ais-refinement-list attribute="players" />
           <h2>Platforms</h2>
-          <ais-refinement-list attribute="platforms"/>
+          <ais-refinement-list attribute="platforms" />
           <h2>Misc</h2>
-          <ais-refinement-list attribute="misc"/>
+          <ais-refinement-list attribute="misc" />
         </div>
 
         <div class="search-panel__results">
-          <ais-search-box placeholder="Search here…"/>
+          <ais-search-box placeholder="Search here…" />
 
           <ais-hits>
             <template slot="item" slot-scope="{ item }">
               <div>
                 <div class="hit-name">
-                  <ais-highlight :hit="item" attribute="name"/>
+                  <ais-highlight :hit="item" attribute="name" />
                 </div>
-                <img :src="item.image" align="left" :alt="item.image">
+                <img :src="item.image" align="left" :alt="item.image" />
                 <div class="hit-description">
-                  <ais-snippet :hit="item" attribute="description"/>
+                  <ais-snippet :hit="item" attribute="description" />
                 </div>
-                <div class="hit-info">price: {{item.price}}</div>
-                <div class="hit-info">release date: {{item.releaseDate}}</div>
+                <div class="hit-info">price: {{ item.price }}</div>
+                <div class="hit-info">release date: {{ item.releaseDate }}</div>
               </div>
             </template>
           </ais-hits>
@@ -57,19 +60,19 @@
 </template>
 
 <script>
-import "instantsearch.css/themes/algolia-min.css";
-import instantMeiliSearch from "../../../src/index.js";
+import 'instantsearch.css/themes/algolia-min.css'
+import instantMeiliSearch from '../../../dist/instant-meilisearch.cjs.js'
 
 export default {
   data() {
     return {
       searchClient: instantMeiliSearch(
-        "https://demos.meilisearch.com",
-        "dc3fedaf922de8937fdea01f0a7d59557f1fd31832cb8440ce94231cfdde7f25"
-      )
-    };
-  }
-};
+        'https://demos.meilisearch.com',
+        'dc3fedaf922de8937fdea01f0a7d59557f1fd31832cb8440ce94231cfdde7f25'
+      ),
+    }
+  },
+}
 </script>
 
 <style>
@@ -80,8 +83,8 @@ h1 {
 }
 
 body {
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
-    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
+    Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
 }
 
 .ais-Hits-item {
@@ -96,7 +99,8 @@ body {
   margin-bottom: 0.5em;
 }
 
-.ais-Highlight-highlighted, .ais-Snippet-highlighted {
+.ais-Highlight-highlighted,
+.ais-Snippet-highlighted {
   background: cyan;
   font-style: normal;
 }
@@ -135,7 +139,7 @@ body {
 }
 
 .header-title::after {
-  content: " ▸ ";
+  content: ' ▸ ';
   padding: 0 0.5rem;
 }
 
diff --git a/rollup.config.js b/rollup.config.js
index c7e2833d..7a205e91 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,9 +1,11 @@
+import commonjs from '@rollup/plugin-commonjs'
 import nodeResolve from '@rollup/plugin-node-resolve'
 import { resolve } from 'path'
-import commonjs from '@rollup/plugin-commonjs'
 import babel from 'rollup-plugin-babel'
-import pkg from './package.json'
 import { terser } from 'rollup-plugin-terser'
+import typescript from 'rollup-plugin-typescript2'
+
+import pkg from './package.json'
 
 function getOutputFileName(fileName, isProd = false) {
   return isProd ? fileName.replace(/\.js$/, '.min.js') : fileName
@@ -13,10 +15,21 @@ const env = process.env.NODE_ENV || 'development'
 const LIB_NAME = 'instantMeiliSearch'
 const ROOT = resolve(__dirname, '.')
 
+const PLUGINS = [
+  typescript({
+    useTsconfigDeclarationDir: true,
+    tsconfigOverride: {
+      allowJs: false,
+      includes: ['src'],
+      exclude: ['tests', 'examples', '*.js', 'scripts'],
+      esModuleInterop: true,
+    },
+  }),
+]
 module.exports = [
   // browser-friendly IIFE build
   {
-    input: 'src/index.js', // directory to transpilation of typescript
+    input: 'src/index.ts', // directory to transpilation of typescript
     output: {
       name: LIB_NAME,
       file: getOutputFileName(
@@ -31,6 +44,7 @@ module.exports = [
       },
     },
     plugins: [
+      ...PLUGINS,
       nodeResolve({
         mainFields: ['jsnext', 'browser', 'main'],
         preferBuiltins: true,
@@ -43,7 +57,7 @@ module.exports = [
     ],
   },
   {
-    input: 'src/index.js',
+    input: 'src/index.ts',
     external: ['meilisearch'],
     output: [
       {
@@ -68,6 +82,7 @@ module.exports = [
     ],
     plugins: [
       env === 'production' ? terser() : {}, // will minify the file in production mode
+      ...PLUGINS,
     ],
   },
 ]
diff --git a/scripts/build.js b/scripts/build.js
new file mode 100644
index 00000000..ae50a4b8
--- /dev/null
+++ b/scripts/build.js
@@ -0,0 +1,65 @@
+/**
+ * This file only purpose is to execute any build related tasks
+ */
+
+const { resolve, normalize } = require('path')
+const { readFileSync, writeFileSync } = require('fs')
+const pkg = require('../package.json')
+
+const ROOT = resolve(__dirname, '..')
+const TYPES_ROOT_FILE = resolve(ROOT, normalize(pkg.typings))
+
+main()
+
+function main() {
+  writeDtsHeader()
+}
+
+function writeDtsHeader() {
+  const dtsHeader = getDtsHeader(
+    pkg.name,
+    pkg.version,
+    pkg.author,
+    pkg.repository.url,
+    pkg.devDependencies.typescript
+  )
+
+  prependFileSync(TYPES_ROOT_FILE, dtsHeader)
+}
+
+/**
+ *
+ * @param {string} pkgName
+ * @param {string} version
+ * @param {string} author
+ * @param {string} repoUrl
+ * @param {string} tsVersion
+ */
+function getDtsHeader(pkgName, version, author, repoUrl, tsVersion) {
+  const extractUserName = repoUrl.match(/\.com\/([\w-]+)\/\w+/i)
+  const githubUserUrl = extractUserName ? extractUserName[1] : 'Unknown'
+
+  return `
+// Type definitions for ${pkgName} ${version}
+// Project: ${repoUrl}
+// Definitions by: ${author} <https://github.com/${githubUserUrl}>
+// Definitions: ${repoUrl}
+// TypeScript Version: ${tsVersion}
+`.replace(/^\s+/gm, '')
+}
+
+/**
+ *
+ * @param {string} path
+ * @param {string | Blob} data
+ */
+function prependFileSync(path, data) {
+  const existingFileContent = readFileSync(path, {
+    encoding: 'utf8',
+  })
+  const newFileContent = [data, existingFileContent].join('\n')
+  writeFileSync(path, newFileContent, {
+    flag: 'w+',
+    encoding: 'utf8',
+  })
+}
diff --git a/src/format.js b/src/format.ts
similarity index 76%
rename from src/format.js
rename to src/format.ts
index 18d2ca3a..a47cf05f 100644
--- a/src/format.js
+++ b/src/format.ts
@@ -1,6 +1,11 @@
-import { isString } from './utils.js'
+import { Params } from '.'
+import { isString } from './utils'
 
-function replaceHighlightTags(value, highlightPreTag, highlightPostTag) {
+function replaceHighlightTags(
+  value: string,
+  highlightPreTag?: string,
+  highlightPostTag?: string
+) {
   let newHighlightValue = value || ''
   // If the value of the attribute is a string,
   // the highlight is applied by MeiliSearch (<em> tags)
@@ -15,15 +20,15 @@ function replaceHighlightTags(value, highlightPreTag, highlightPostTag) {
   return newHighlightValue.toString()
 }
 
-function createHighlighResult({
+function createHighlighResult<T extends Record<string, any>>({
   formattedHit,
   highlightPreTag,
   highlightPostTag,
-}) {
+}: { formattedHit: T } & Params) {
   // formattedHit is the `_formatted` object returned by MeiliSearch.
   // It contains all the highlighted and croped attributes
   return Object.keys(formattedHit).reduce((result, key) => {
-    result[key] = {
+    ;(result[key] as any) = {
       value: replaceHighlightTags(
         formattedHit[key],
         highlightPreTag,
@@ -31,14 +36,14 @@ function createHighlighResult({
       ),
     }
     return result
-  }, {})
+  }, {} as T)
 }
 
 function snippetFinalValue(
-  value,
-  snippetEllipsisText,
-  highlightPreTag,
-  highlightPostTag
+  value: string,
+  snippetEllipsisText?: string,
+  highlightPreTag?: string,
+  highlightPostTag?: string
 ) {
   let newValue = value
   // manage a kind of `...` for the crop until this issue is solved: https://github.com/meilisearch/MeiliSearch/issues/923
@@ -58,24 +63,27 @@ function snippetFinalValue(
   return replaceHighlightTags(newValue, highlightPreTag, highlightPostTag)
 }
 
-function createSnippetResult({
+function createSnippetResult<
+  T extends Record<string, any>,
+  K extends keyof T & string
+>({
   formattedHit,
   attributesToSnippet,
   snippetEllipsisText,
   highlightPreTag,
   highlightPostTag,
-}) {
+}: { formattedHit: T } & Params) {
   if (attributesToSnippet === undefined) {
     return null
   }
   attributesToSnippet = attributesToSnippet.map(
     (attribute) => attribute.split(':')[0]
-  )
+  ) as K[]
   // formattedHit is the `_formatted` object returned by MeiliSearch.
   // It contains all the highlighted and croped attributes
-  return Object.keys(formattedHit).reduce((result, key) => {
-    if (attributesToSnippet.includes(key)) {
-      result[key] = {
+  return (Object.keys(formattedHit) as K[]).reduce((result, key) => {
+    if (attributesToSnippet!.includes(key)) {
+      ;(result[key] as any) = {
         value: snippetFinalValue(
           formattedHit[key],
           snippetEllipsisText,
@@ -85,7 +93,7 @@ function createSnippetResult({
       }
     }
     return result
-  }, {})
+  }, {} as T)
 }
 
 export { createHighlighResult, createSnippetResult }
diff --git a/src/index.js b/src/index.ts
similarity index 54%
rename from src/index.js
rename to src/index.ts
index 7abd618d..96a3c0e7 100644
--- a/src/index.js
+++ b/src/index.ts
@@ -1,18 +1,101 @@
-import MeiliSearch from 'meilisearch'
-import { removeUndefinedFromObject } from './utils.js'
-import { createHighlighResult, createSnippetResult } from './format.js'
+import MeiliSearch, { SearchParams, SearchResponse } from 'meilisearch'
 
-export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
+import { createHighlighResult, createSnippetResult } from './format'
+import { removeUndefinedFromObject } from './utils'
+
+export type Params = {
+  page?: number
+  hitsPerPage?: number
+  highlightPreTag?: string
+  highlightPostTag?: string
+  snippetEllipsisText?: string
+  attributesToSnippet?: string[]
+  query: string
+  facets: string[] // TODO: exclude key facetsDistribution because this one is used instead
+} & SearchParams<any>
+
+type Request = {
+  params: Params
+  indexName: string
+}
+type Requests = {
+  0: Request
+}
+type InstantMeiliSearchOptions = {
+  paginationTotalHits?: number
+  placeholderSearch?: boolean
+}
+
+type InstantMeiliSearchInstance = {
+  pagination?: boolean
+  paginationTotalHits: number
+  hitsPerPage?: number
+  client: MeiliSearch
+  attributesToHighlight: string[]
+  placeholderSearch: boolean
+  parseMeiliSearchResponse: (
+    indexUid: string,
+    meiliSearchResponse: SearchResponse<any, any>,
+    params: Params
+  ) => {
+    results: Array<{
+      hits: any
+      index: string
+      hitsPerPage: number
+      facets: object | undefined
+      exhaustiveFacetsCount?: boolean
+      processingTimeMs: number
+      exhaustiveNbHits: boolean
+    }>
+  }
+
+  transformToMeiliSearchParams: (
+    params: Params
+  ) => {
+    q: any
+    facetsDistribution: any
+    facetFilters: any
+    attributesToHighlight: string[]
+    attributesToCrop: string[] | undefined
+    filters: any
+    limit: number
+  }
+  parseHits: (meiliSearchHits: any, params: Params) => any
+  paginationParams: (
+    hitsLength: number,
+    params: Params
+  ) => { nbPages: number; page: number | undefined } | undefined
+
+  search: (
+    requests: Requests
+  ) => Promise<{
+    results: Array<{
+      hits: any
+      index: string
+      hitsPerPage: number
+      facets: object | undefined
+      exhaustiveFacetsCount?: boolean | undefined
+      processingTimeMs: number
+      exhaustiveNbHits: boolean
+    }>
+  }>
+}
+
+export default function instantMeiliSearch(
+  hostUrl: string,
+  apiKey: string,
+  options: InstantMeiliSearchOptions = {}
+): InstantMeiliSearchInstance {
   return {
     client: new MeiliSearch({ host: hostUrl, apiKey: apiKey }),
     attributesToHighlight: ['*'],
     paginationTotalHits: options.paginationTotalHits || 200,
     placeholderSearch: options.placeholderSearch !== false, // true by default
 
-    transformToMeiliSearchParams: function (params) {
+    transformToMeiliSearchParams: function (params: Params) {
       const limit = this.pagination // if pagination widget is set, use paginationTotalHits as limit
         ? this.paginationTotalHits
-        : this.hitsPerPage
+        : this.hitsPerPage!
       const {
         query,
         facets,
@@ -34,13 +117,14 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
       return removeUndefinedFromObject(searchInput)
     },
 
-    parseHits: function (meiliSearchHits, params) {
+    parseHits: function (meiliSearchHits, params: Params) {
       if (this.pagination) {
-        const start = params.page * this.hitsPerPage
+        params.page ||= 0
+        const start = params.page * this.hitsPerPage!
         meiliSearchHits = meiliSearchHits.splice(start, this.hitsPerPage)
       }
 
-      return meiliSearchHits.map((hit) => {
+      return meiliSearchHits.map((hit: any) => {
         const formattedHit = hit._formatted
         delete hit._formatted
         return {
@@ -51,10 +135,10 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
       })
     },
 
-    paginationParams: function (hitsLength, params) {
+    paginationParams: function (hitsLength: number, params: Params) {
       if (this.pagination) {
-        const adjust = hitsLength % this.hitsPerPage === 0 ? 0 : 1
-        const nbPages = Math.floor(hitsLength / this.hitsPerPage) + adjust
+        const adjust = hitsLength % this.hitsPerPage! === 0 ? 0 : 1
+        const nbPages = Math.floor(hitsLength / this.hitsPerPage!) + adjust
         return {
           nbPages: nbPages, // total number of pages
           page: params.page, // the current page, information sent by InstantSearch
@@ -62,7 +146,11 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
       }
     },
 
-    parseMeiliSearchResponse: function (indexUid, meiliSearchResponse, params) {
+    parseMeiliSearchResponse: function (
+      indexUid: string,
+      meiliSearchResponse: SearchResponse<any, any>,
+      params: Params
+    ) {
       const {
         exhaustiveFacetsCount,
         exhaustiveNbHits,
@@ -75,7 +163,7 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
 
       const parsedResponse = {
         index: indexUid,
-        hitsPerPage: this.hitsPerPage,
+        hitsPerPage: this.hitsPerPage!,
         facets,
         exhaustiveFacetsCount,
         exhaustiveNbHits,
@@ -91,7 +179,7 @@ export default function instantMeiliSearch(hostUrl, apiKey, options = {}) {
       }
     },
 
-    search: async function (requests) {
+    search: async function (requests: Requests) {
       // Params got from InstantSearch
       const params = requests[0].params
       this.pagination = params.page !== undefined // If the pagination widget has been set
diff --git a/src/utils.js b/src/utils.js
deleted file mode 100644
index a1b0aee1..00000000
--- a/src/utils.js
+++ /dev/null
@@ -1,14 +0,0 @@
-function removeUndefinedFromObject(object) {
-  return Object.keys(object).reduce((result, key) => {
-    if (object[key] !== undefined) {
-      result[key] = object[key]
-    }
-    return result
-  }, {})
-}
-
-function isString(str) {
-  return typeof str === 'string' || str instanceof String
-}
-
-export { isString, removeUndefinedFromObject }
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 00000000..03f506ac
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,19 @@
+type NoUndefined<T> = {
+  [P in keyof T]-?: Exclude<T[P], undefined>
+}
+
+export function removeUndefinedFromObject<
+  T extends Record<string, any>,
+  K extends keyof T & string
+>(object: T) {
+  return (Object.keys(object) as K[]).reduce((result, key) => {
+    if (object[key] !== undefined) {
+      result[key] = object[key]
+    }
+    return result
+  }, {} as NoUndefined<T>)
+}
+
+export function isString(str: any) {
+  return typeof str === 'string' || str instanceof String
+}
diff --git a/tests/base.test.js b/tests/base.test.ts
similarity index 100%
rename from tests/base.test.js
rename to tests/base.test.ts
diff --git a/tsconfig.eslint.json b/tsconfig.eslint.json
new file mode 100644
index 00000000..a236ea6b
--- /dev/null
+++ b/tsconfig.eslint.json
@@ -0,0 +1,13 @@
+{
+  // extend your base config so you don't have to redefine your compilerOptions
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "allowJs": false
+  },
+  "include": [
+    "tests/**/*.ts",
+    "jest.config.js",
+    "rollup.config.js",
+    ".eslintrc.js"
+  ]
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..62d8e55f
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "module": "esnext",
+    "noEmit": true,
+    "allowJs": false,
+    "removeComments": false,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "declarationDir": "./dist/types",
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "moduleResolution": "node",
+    "noImplicitAny": true,
+    "lib": ["ES2015", "ESNext", "dom"]
+  },
+  "include": ["src"] // files to include during transpilation
+}
diff --git a/yarn.lock b/yarn.lock
index ffe4249b..80b3c342 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1224,6 +1224,14 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
+"@types/jest@26.x":
+  version "26.0.15"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.15.tgz#12e02c0372ad0548e07b9f4e19132b834cb1effe"
+  integrity sha512-s2VMReFXRg9XXxV+CW9e5Nz8fH2K1aEhwgjUqPPbQd7g95T0laAcvLv032EhFHIa5GHsZ8W7iJEQVaJq6k3Gog==
+  dependencies:
+    jest-diff "^26.0.0"
+    pretty-format "^26.0.0"
+
 "@types/json-schema@^7.0.3":
   version "7.0.6"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.6.tgz#f4c7ec43e81b319a9815115031709f26987891f0"
@@ -1729,6 +1737,13 @@ browserslist@^4.14.5, browserslist@^4.14.6:
     escalade "^3.1.1"
     node-releases "^1.1.65"
 
+bs-logger@0.x:
+  version "0.2.6"
+  resolved "https://registry.yarnpkg.com/bs-logger/-/bs-logger-0.2.6.tgz#eb7d365307a72cf974cc6cda76b68354ad336bd8"
+  integrity sha512-pd8DCoxmbgc7hyPKOvxtqNcjYoOsABPQdcCUjGp3d42VR2CX1ORhk2A87oqqu5R1kk+76nsxZupkmyd+MVtCog==
+  dependencies:
+    fast-json-stable-stringify "2.x"
+
 bser@2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/bser/-/bser-2.1.1.tgz#e6787da20ece9d07998533cfd9de6f5c38f4bc05"
@@ -1736,7 +1751,7 @@ bser@2.1.1:
   dependencies:
     node-int64 "^0.4.0"
 
-buffer-from@^1.0.0:
+buffer-from@1.x, buffer-from@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
   integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
@@ -1945,6 +1960,11 @@ commander@^4.0.1:
   resolved "https://registry.yarnpkg.com/commander/-/commander-4.1.1.tgz#9fd602bd936294e9e9ef46a3f4d6964044b18068"
   integrity sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==
 
+comment-parser@^0.7.6:
+  version "0.7.6"
+  resolved "https://registry.yarnpkg.com/comment-parser/-/comment-parser-0.7.6.tgz#0e743a53c8e646c899a1323db31f6cd337b10f12"
+  integrity sha512-GKNxVA7/iuTnAqGADlTWX4tkhzxZKXp5fLJqKTlQLHkE65XDUKutZ3BHaJC5IGcper2tT3QRD1xr4o3jNpgXXg==
+
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -2072,7 +2092,7 @@ debug@^2.2.0, debug@^2.3.3, debug@^2.6.9:
   dependencies:
     ms "2.0.0"
 
-debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
+debug@^4.0.1, debug@^4.1.0, debug@^4.1.1, debug@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.2.0.tgz#7f150f93920e94c58f5574c2fd01a3110effe7f1"
   integrity sha512-IX2ncY78vDTjZMFUdmsvIRFY2Cf4FnD0wRs+nQwJU8Lu99/tPFdb0VybiiMTPe3I6rQmwsqQqRBvxU+bZ/I8sg==
@@ -2386,6 +2406,19 @@ eslint-plugin-jest@^24.0.0:
   dependencies:
     "@typescript-eslint/experimental-utils" "^4.0.1"
 
+eslint-plugin-jsdoc@^30.7.7:
+  version "30.7.7"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-30.7.7.tgz#2af2c68e5adaf8a59fc3c72081a4b137098268bb"
+  integrity sha512-DmVMJC2AbpYX7X1KhnVT1a9ex1AUvG+q9G8i6hzjp3cpjW8vmKQTUmZnRS0//W+7HvMqeb+eXPANdCOzGVVZBQ==
+  dependencies:
+    comment-parser "^0.7.6"
+    debug "^4.2.0"
+    jsdoctypeparser "^9.0.0"
+    lodash "^4.17.20"
+    regextras "^0.7.1"
+    semver "^7.3.2"
+    spdx-expression-parse "^3.0.1"
+
 eslint-plugin-jsx-a11y@^6.4.1:
   version "6.4.1"
   resolved "https://registry.yarnpkg.com/eslint-plugin-jsx-a11y/-/eslint-plugin-jsx-a11y-6.4.1.tgz#a2d84caa49756942f42f1ffab9002436391718fd"
@@ -2728,7 +2761,7 @@ fast-glob@^3.1.1:
     micromatch "^4.0.2"
     picomatch "^2.2.1"
 
-fast-json-stable-stringify@^2.0.0:
+fast-json-stable-stringify@2.x, fast-json-stable-stringify@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz#874bf69c6f404c2b5d99c481341399fd55892633"
   integrity sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==
@@ -2781,6 +2814,15 @@ fill-range@^7.0.1:
   dependencies:
     to-regex-range "^5.0.1"
 
+find-cache-dir@^3.3.1:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-3.3.1.tgz#89b33fad4a4670daa94f855f7fbe31d6d84fe880"
+  integrity sha512-t2GDMt3oGC/v+BMwzmllWDuJF/xcDtE5j/fCGbqDD7OLuJkj0cfh1YSA5VKPvwMeLFLNDBkwOKZ2X85jGLVftQ==
+  dependencies:
+    commondir "^1.0.1"
+    make-dir "^3.0.2"
+    pkg-dir "^4.1.0"
+
 find-up@^2.0.0, find-up@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/find-up/-/find-up-2.1.0.tgz#45d1b7e506c717ddd482775a2b77920a3c0c57a7"
@@ -2836,6 +2878,15 @@ fragment-cache@^0.2.1:
   dependencies:
     map-cache "^0.2.2"
 
+fs-extra@8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-8.1.0.tgz#49d43c45a88cd9677668cb7be1b46efdb8d2e1c0"
+  integrity sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==
+  dependencies:
+    graceful-fs "^4.2.0"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
+
 fs-readdir-recursive@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/fs-readdir-recursive/-/fs-readdir-recursive-1.1.0.tgz#e32fc030a2ccee44a6b5371308da54be0b397d27"
@@ -2980,7 +3031,7 @@ globby@^11.0.1:
     merge2 "^1.3.0"
     slash "^3.0.0"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.2.4:
+graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4:
   version "4.2.4"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
@@ -3147,6 +3198,11 @@ internal-slot@^1.0.2:
     has "^1.0.3"
     side-channel "^1.0.2"
 
+interpret@^1.0.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.4.0.tgz#665ab8bc4da27a774a40584e812e3e0fa45b1a1e"
+  integrity sha512-agE4QfB2Lkp9uICn7BAqoscw4SZP9kTE2hxiFI3jBPmXJfdqiahTbUuKGsMoN2GtqL9AxhYioAcVvgsb1HvRbA==
+
 ip-regex@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/ip-regex/-/ip-regex-2.1.0.tgz#fa78bf5d2e6913c911ce9f819ee5146bb6d844e9"
@@ -3202,7 +3258,7 @@ is-ci@^2.0.0:
   dependencies:
     ci-info "^2.0.0"
 
-is-core-module@^2.0.0:
+is-core-module@^2.0.0, is-core-module@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.1.0.tgz#a4cc031d9b1aca63eecbd18a650e13cb4eeab946"
   integrity sha512-YcV7BgVMRFRua2FqQzKtTDMz8iCuLEyGKjr70q8Zm1yy2qKcurbFEd79PAdHV77oL3NrAaOVQIbMmiHQCHB7ZA==
@@ -3504,7 +3560,7 @@ jest-config@^26.6.3:
     micromatch "^4.0.2"
     pretty-format "^26.6.2"
 
-jest-diff@^26.6.2:
+jest-diff@^26.0.0, jest-diff@^26.6.2:
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.6.2.tgz#1aa7468b52c3a68d7d5c5fdcdfcd5e49bd164394"
   integrity sha512-6m+9Z3Gv9wN0WFVasqjCL/06+EFCMTqDEUl/b87HYK2rAPTyfz4ZIuSlPhY51PIQRWx5TaxeF1qmXKe9gfN3sA==
@@ -3770,7 +3826,7 @@ jest-snapshot@^26.6.2:
     pretty-format "^26.6.2"
     semver "^7.3.2"
 
-jest-util@^26.6.2:
+jest-util@^26.1.0, jest-util@^26.6.2:
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-26.6.2.tgz#907535dbe4d5a6cb4c47ac9b926f6af29576cbc1"
   integrity sha512-MDW0fKfsn0OI7MS7Euz6h8HNDXVQ0gaM9uW6RjfDmd1DAFcaxX9OqIakHIqhbnmF08Cf2DLDG+ulq8YQQ0Lp0Q==
@@ -3856,6 +3912,11 @@ jsbn@~0.1.0:
   resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
   integrity sha1-peZUwuWi3rXyAdls77yoDA7y9RM=
 
+jsdoctypeparser@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/jsdoctypeparser/-/jsdoctypeparser-9.0.0.tgz#8c97e2fb69315eb274b0f01377eaa5c940bd7b26"
+  integrity sha512-jrTA2jJIL6/DAEILBEh2/w9QxCuwmvNXIry39Ay/HVfhE3o2yVV0U44blYkqdHA/OKloJEqvJy0xU+GSdE2SIw==
+
 jsdom@^16.4.0:
   version "16.4.0"
   resolved "https://registry.yarnpkg.com/jsdom/-/jsdom-16.4.0.tgz#36005bde2d136f73eee1a830c6d45e55408edddb"
@@ -3923,6 +3984,13 @@ json-stringify-safe@~5.0.1:
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
   integrity sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=
 
+json5@2.x, json5@^2.1.2:
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.3.tgz#c9b0f7fa9233bfe5807fe66fcf3a5617ed597d43"
+  integrity sha512-KXPvOm8K9IJKFM0bmdn8QXh7udDh1g/giieX0NLCaMnb4hEiVFqnop2ImTXCc5e0/oHz3LTqmHGtExn5hfMkOA==
+  dependencies:
+    minimist "^1.2.5"
+
 json5@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/json5/-/json5-1.0.1.tgz#779fb0018604fa854eacbf6252180d83543e3dbe"
@@ -3930,12 +3998,12 @@ json5@^1.0.1:
   dependencies:
     minimist "^1.2.0"
 
-json5@^2.1.2:
-  version "2.1.3"
-  resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.3.tgz#c9b0f7fa9233bfe5807fe66fcf3a5617ed597d43"
-  integrity sha512-KXPvOm8K9IJKFM0bmdn8QXh7udDh1g/giieX0NLCaMnb4hEiVFqnop2ImTXCc5e0/oHz3LTqmHGtExn5hfMkOA==
-  dependencies:
-    minimist "^1.2.5"
+jsonfile@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-4.0.0.tgz#8771aae0799b64076b76640fca058f9c10e33ecb"
+  integrity sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=
+  optionalDependencies:
+    graceful-fs "^4.1.6"
 
 jsprim@^1.2.2:
   version "1.4.1"
@@ -4047,12 +4115,17 @@ locate-path@^5.0.0:
   dependencies:
     p-locate "^4.1.0"
 
+lodash.memoize@4.x:
+  version "4.1.2"
+  resolved "https://registry.yarnpkg.com/lodash.memoize/-/lodash.memoize-4.1.2.tgz#bcc6c49a42a2840ed997f323eada5ecd182e0bfe"
+  integrity sha1-vMbEmkKihA7Zl/Mj6tpezRguC/4=
+
 lodash.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
   integrity sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=
 
-lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19:
+lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19, lodash@^4.17.20:
   version "4.17.20"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
   integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
@@ -4079,13 +4152,18 @@ make-dir@^2.1.0:
     pify "^4.0.1"
     semver "^5.6.0"
 
-make-dir@^3.0.0:
+make-dir@^3.0.0, make-dir@^3.0.2:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-3.1.0.tgz#415e967046b3a7f1d185277d84aa58203726a13f"
   integrity sha512-g3FeP20LNwhALb/6Cz6Dd4F2ngze0jz7tbzrD2wAV+o9FeNHe4rL+yK2md0J/fiSf1sa1ADhXqi5+oVwOM/eGw==
   dependencies:
     semver "^6.0.0"
 
+make-error@1.x:
+  version "1.3.6"
+  resolved "https://registry.yarnpkg.com/make-error/-/make-error-1.3.6.tgz#2eb2e37ea9b67c4891f684a1394799af484cf7a2"
+  integrity sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==
+
 makeerror@1.0.x:
   version "1.0.11"
   resolved "https://registry.yarnpkg.com/makeerror/-/makeerror-1.0.11.tgz#e01a5c9109f2af79660e4e8b9587790184f5a96c"
@@ -4105,7 +4183,7 @@ map-visit@^1.0.0:
   dependencies:
     object-visit "^1.0.0"
 
-meilisearch@^0.16.0:
+meilisearch@^0.16.1:
   version "0.16.1"
   resolved "https://registry.yarnpkg.com/meilisearch/-/meilisearch-0.16.1.tgz#e54f8720b595b35195b7ce7a4947d5e5406032d7"
   integrity sha512-KrKDaX0gvsiIKGbmmUShrv4xLQ0BqUjhftQ4/2PM1lMHmhUyfTFzrUfK3CToRAlUxZ/sEpf8SeAlTkKP4QBGsw==
@@ -4173,7 +4251,7 @@ minimatch@^3.0.4:
   dependencies:
     brace-expansion "^1.1.7"
 
-minimist@^1.1.1, minimist@^1.2.0, minimist@^1.2.5:
+minimist@^1.1.1, minimist@^1.2.0, minimist@^1.2.3, minimist@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
@@ -4186,6 +4264,11 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
+mkdirp@1.x:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
+  integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
+
 mkdirp@^0.5.1:
   version "0.5.5"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.5.tgz#d91cefd62d1436ca0f41620e251288d420099def"
@@ -4591,7 +4674,7 @@ pkg-dir@^2.0.0:
   dependencies:
     find-up "^2.1.0"
 
-pkg-dir@^4.2.0:
+pkg-dir@^4.1.0, pkg-dir@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-4.2.0.tgz#f099133df7ede422e81d1d8448270eeb3e4261f3"
   integrity sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==
@@ -4625,7 +4708,7 @@ prettier@^2.0.0:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.0.tgz#8a03c7777883b29b37fb2c4348c66a78e980418b"
   integrity sha512-yYerpkvseM4iKD/BXLYUkQV5aKt4tQPqaGW6EsZjzyu0r7sVZZNPJW4Y8MyKmicp6t42XUPcBVA+H6sB3gqndw==
 
-pretty-format@^26.6.2:
+pretty-format@^26.0.0, pretty-format@^26.6.2:
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.6.2.tgz#e35c2705f14cb7fe2fe94fa078345b444120fc93"
   integrity sha512-7AeGuCYNGmycyQbCqd/3PWH4eOoX/OiCa0uphp57NVTeAGdJGaAliecxwBDHYQCIvrW7aDBZCYeNTP/WX69mkg==
@@ -4767,6 +4850,13 @@ readdirp@~3.5.0:
   dependencies:
     picomatch "^2.2.1"
 
+rechoir@^0.6.2:
+  version "0.6.2"
+  resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
+  integrity sha1-hSBLVNuoLVdC4oyWdW70OvUOM4Q=
+  dependencies:
+    resolve "^1.1.6"
+
 regenerate-unicode-properties@^8.2.0:
   version "8.2.0"
   resolved "https://registry.yarnpkg.com/regenerate-unicode-properties/-/regenerate-unicode-properties-8.2.0.tgz#e5de7111d655e7ba60c057dbe9ff37c87e65cdec"
@@ -4824,6 +4914,11 @@ regexpu-core@^4.7.1:
     unicode-match-property-ecmascript "^1.0.4"
     unicode-match-property-value-ecmascript "^1.2.0"
 
+regextras@^0.7.1:
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/regextras/-/regextras-0.7.1.tgz#be95719d5f43f9ef0b9fa07ad89b7c606995a3b2"
+  integrity sha512-9YXf6xtW+qzQ+hcMQXx95MOvfqXFgsKDZodX3qZB0x2n5Z94ioetIITsBtvJbiOyxa/6s9AtyweBLCdPmPko/w==
+
 regjsgen@^0.5.1:
   version "0.5.2"
   resolved "https://registry.yarnpkg.com/regjsgen/-/regjsgen-0.5.2.tgz#92ff295fb1deecbf6ecdab2543d207e91aa33733"
@@ -4925,6 +5020,21 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
+resolve@1.17.0:
+  version "1.17.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.17.0.tgz#b25941b54968231cc2d1bb76a79cb7f2c0bf8444"
+  integrity sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==
+  dependencies:
+    path-parse "^1.0.6"
+
+resolve@^1.1.6:
+  version "1.19.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.19.0.tgz#1af5bf630409734a067cae29318aac7fa29a267c"
+  integrity sha512-rArEXAgsBG4UgRGcynxWIWKFvh/XZCcS8UJdHhwy91zwAvCZIbcs+vAbflgBnNjYMs/i/i+/Ux6IZhML1yPvxg==
+  dependencies:
+    is-core-module "^2.1.0"
+    path-parse "^1.0.6"
+
 resolve@^1.10.0, resolve@^1.10.1, resolve@^1.12.0, resolve@^1.13.1, resolve@^1.17.0, resolve@^1.18.1, resolve@^1.3.2:
   version "1.18.1"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.18.1.tgz#018fcb2c5b207d2a6424aee361c5a266da8f4130"
@@ -4975,6 +5085,17 @@ rollup-plugin-terser@^7.0.0:
     serialize-javascript "^4.0.0"
     terser "^5.0.0"
 
+rollup-plugin-typescript2@^0.29.0:
+  version "0.29.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-typescript2/-/rollup-plugin-typescript2-0.29.0.tgz#b7ad83f5241dbc5bdf1e98d9c3fca005ffe39e1a"
+  integrity sha512-YytahBSZCIjn/elFugEGQR5qTsVhxhUwGZIsA9TmrSsC88qroGo65O5HZP/TTArH2dm0vUmYWhKchhwi2wL9bw==
+  dependencies:
+    "@rollup/pluginutils" "^3.1.0"
+    find-cache-dir "^3.3.1"
+    fs-extra "8.1.0"
+    resolve "1.17.0"
+    tslib "2.0.1"
+
 rollup-pluginutils@^2.8.1:
   version "2.8.2"
   resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-2.8.2.tgz#72f2af0748b592364dbd3389e600e5a9444a351e"
@@ -5053,16 +5174,16 @@ semver@7.0.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.0.0.tgz#5f3ca35761e47e05b206c6daff2cf814f0316b8e"
   integrity sha512-+GB6zVA9LWh6zovYQLALHwv5rb2PHGlJi3lfiqIHxR0uuwCgefcOJc59v9fv1w8GbStwxuuqqAjI9NMAOOgq1A==
 
+semver@7.x, semver@^7.2.1, semver@^7.3.2:
+  version "7.3.2"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.2.tgz#604962b052b81ed0786aae84389ffba70ffd3938"
+  integrity sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==
+
 semver@^6.0.0, semver@^6.1.0, semver@^6.3.0:
   version "6.3.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
-semver@^7.2.1, semver@^7.3.2:
-  version "7.3.2"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.2.tgz#604962b052b81ed0786aae84389ffba70ffd3938"
-  integrity sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==
-
 serialize-javascript@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-4.0.0.tgz#b525e1238489a5ecfc42afacc3fe99e666f4b1aa"
@@ -5109,11 +5230,28 @@ shebang-regex@^3.0.0:
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-3.0.0.tgz#ae16f1644d873ecad843b0307b143362d4c42172"
   integrity sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==
 
+shelljs@^0.8.4:
+  version "0.8.4"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.4.tgz#de7684feeb767f8716b326078a8a00875890e3c2"
+  integrity sha512-7gk3UZ9kOfPLIAbslLzyWeGiEqx9e3rxwZM0KE6EL8GlGwjym9Mrlx5/p33bWTu9YG6vcS4MBxYZDHYr5lr8BQ==
+  dependencies:
+    glob "^7.0.0"
+    interpret "^1.0.0"
+    rechoir "^0.6.2"
+
 shellwords@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.1.tgz#d6b9181c1a48d397324c84871efbcfc73fc0654b"
   integrity sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==
 
+shx@^0.3.3:
+  version "0.3.3"
+  resolved "https://registry.yarnpkg.com/shx/-/shx-0.3.3.tgz#681a88c7c10db15abe18525349ed474f0f1e7b9f"
+  integrity sha512-nZJ3HFWVoTSyyB+evEKjJ1STiixGztlqwKLTUNV5KqMWtGey9fTd4KU1gdZ1X9BV6215pswQ/Jew9NsuS/fNDA==
+  dependencies:
+    minimist "^1.2.3"
+    shelljs "^0.8.4"
+
 side-channel@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/side-channel/-/side-channel-1.0.3.tgz#cdc46b057550bbab63706210838df5d4c19519c3"
@@ -5238,7 +5376,7 @@ spdx-exceptions@^2.1.0:
   resolved "https://registry.yarnpkg.com/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz#3f28ce1a77a00372683eade4a433183527a2163d"
   integrity sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==
 
-spdx-expression-parse@^3.0.0:
+spdx-expression-parse@^3.0.0, spdx-expression-parse@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz#cf70f50482eefdc98e3ce0a6833e4a53ceeba679"
   integrity sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==
@@ -5542,6 +5680,23 @@ tr46@^2.0.2:
   dependencies:
     punycode "^2.1.1"
 
+ts-jest@^26.4.4:
+  version "26.4.4"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.4.4.tgz#61f13fb21ab400853c532270e52cc0ed7e502c49"
+  integrity sha512-3lFWKbLxJm34QxyVNNCgXX1u4o/RV0myvA2y2Bxm46iGIjKlaY0own9gIckbjZJPn+WaJEnfPPJ20HHGpoq4yg==
+  dependencies:
+    "@types/jest" "26.x"
+    bs-logger "0.x"
+    buffer-from "1.x"
+    fast-json-stable-stringify "2.x"
+    jest-util "^26.1.0"
+    json5 "2.x"
+    lodash.memoize "4.x"
+    make-error "1.x"
+    mkdirp "1.x"
+    semver "7.x"
+    yargs-parser "20.x"
+
 tsconfig-paths@^3.9.0:
   version "3.9.0"
   resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz#098547a6c4448807e8fcb8eae081064ee9a3c90b"
@@ -5552,6 +5707,11 @@ tsconfig-paths@^3.9.0:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
+tslib@2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.1.tgz#410eb0d113e5b6356490eec749603725b021b43e"
+  integrity sha512-SgIkNheinmEBgx1IUNirK0TUD4X9yjjBRTqqjggWCU3pUEqIk3/Uwl3yRixYKT6WjQuGiwDv4NomL3wqRCj+CQ==
+
 tslib@^1.8.1:
   version "1.14.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
@@ -5655,6 +5815,11 @@ union-value@^1.0.0:
     is-extendable "^0.1.1"
     set-value "^2.0.1"
 
+universalify@^0.1.0:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.2.tgz#b646f69be3942dabcecc9d6639c80dc105efaa66"
+  integrity sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==
+
 unset-value@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unset-value/-/unset-value-1.0.0.tgz#8376873f7d2335179ffb1e6fc3a8ed0dfc8ab559"
@@ -5870,6 +6035,11 @@ y18n@^4.0.0:
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
   integrity sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==
 
+yargs-parser@20.x:
+  version "20.2.4"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-20.2.4.tgz#b42890f14566796f85ae8e3a25290d205f154a54"
+  integrity sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==
+
 yargs-parser@^18.1.2:
   version "18.1.3"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-18.1.3.tgz#be68c4975c6b2abf469236b0c870362fab09a7b0"