diff --git a/.babelrc b/.babelrc
index 3299dd4a..ddcdf7ac 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,7 +1,8 @@
 {
   "presets": [
+    "@babel/preset-env",
     "@babel/preset-react",
-    "@babel/preset-env"
+    "@babel/preset-typescript"
   ],
   "plugins": [
     ["@babel/plugin-proposal-class-properties", { "loose" : true }]
diff --git a/.eslintrc b/.eslintrc
index c587354a..708b8706 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,4 +1,14 @@
 {
   "parser": "babel-eslint",
+  "rules": {
+    "import/extensions": [".js", ".ts"]
+  },
+  "settings": {
+    "import/resolver": {
+      "node": {
+        "extensions": [".js", ".ts"]
+      }
+    }
+  },
   "extends": ["airbnb", "prettier"]
 }
diff --git a/dist/interfaces.d.ts b/dist/interfaces.d.ts
new file mode 100644
index 00000000..372b5e9d
--- /dev/null
+++ b/dist/interfaces.d.ts
@@ -0,0 +1,5 @@
+export declare type IValue = any;
+export declare type IValues = {
+    [key: string]: IValue;
+};
+export declare type IValidationFunction = (values: IValues, value: IValue, extra?: any) => boolean;
diff --git a/dist/validationRules.d.ts b/dist/validationRules.d.ts
new file mode 100644
index 00000000..fe8162bf
--- /dev/null
+++ b/dist/validationRules.d.ts
@@ -0,0 +1,5 @@
+import { IValidationFunction } from './interfaces';
+declare const validations: {
+    [key: string]: IValidationFunction;
+};
+export default validations;
diff --git a/package.json b/package.json
index 264ec698..1e4a795a 100644
--- a/package.json
+++ b/package.json
@@ -42,21 +42,23 @@
   "browser": "dist/formsy-react.umd.js",
   "main": "dist/formsy-react.cjs.js",
   "module": "dist/formsy-react.esm.js",
+  "types": "dist/formsy-react.d.ts",
   "scripts": {
-    "build": "npm run build:clean && npm run build:js",
+    "build": "npm run build:clean && npm run build:types && npm run build:js",
     "build:clean": "rm -r dist/* || true",
     "build:js": "rollup -c",
+    "build:types": "tsc --emitDeclarationOnly",
     "changelog": "auto-changelog",
     "deploy": "np",
     "format": "prettier --write \"**/*.{js,ts}\"",
-    "lint": "eslint src/**/*.js",
+    "lint": "eslint src/**/*",
     "preversion": "npm run lint",
     "test": "jest",
     "version": "npm run build && git add lib && git add release && npm run changelog && git add CHANGELOG.md"
   },
   "dependencies": {
     "form-data-to-object": "^0.2.0",
-    "prop-types": "^15.5.10"
+    "prop-types": "^15.7.2"
   },
   "devDependencies": {
     "@babel/cli": "^7.4.4",
@@ -65,6 +67,8 @@
     "@babel/plugin-proposal-class-properties": "^7.4.4",
     "@babel/preset-env": "^7.4.5",
     "@babel/preset-react": "^7.0.0",
+    "@babel/preset-typescript": "^7.3.3",
+    "@types/react": "^16.8.22",
     "auto-changelog": "^1.13.0",
     "babel-eslint": "^10.0.2",
     "babel-jest": "^24.8.0",
@@ -75,7 +79,7 @@
     "eslint": "^4.14.0",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-config-prettier": "^5.0.0",
-    "eslint-plugin-import": "^2.7.0",
+    "eslint-plugin-import": "^2.17.3",
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-react": "^7.5.1",
     "husky": "^2.4.1",
@@ -90,7 +94,8 @@
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-node-resolve": "^5.0.4",
     "rollup-plugin-peer-deps-external": "^2.2.0",
-    "sinon": "^7.3.2"
+    "sinon": "^7.3.2",
+    "typescript": "^3.5.2"
   },
   "peerDependencies": {
     "react": "^15.6.1 || ^16.0.0",
diff --git a/rollup.config.js b/rollup.config.js
index 59d91c55..e9243c56 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -8,7 +8,7 @@ import pkg from './package.json';
 
 const name = 'formsy-react',
   input = 'src/index.js',
-  extensions = ['.js'],
+  extensions = ['.js', '.ts'],
   babelConfig = {
     ...babelrc({ addExternalHelpersPlugin: false }),
     exclude: 'node_modules/**',
diff --git a/src/interfaces.ts b/src/interfaces.ts
new file mode 100644
index 00000000..11e8d634
--- /dev/null
+++ b/src/interfaces.ts
@@ -0,0 +1,3 @@
+export type IValue = any;
+export type IValues = { [key: string]: IValue };
+export type IValidationFunction = (values: IValues, value: IValue, extra?: any) => boolean;
diff --git a/src/validationRules.js b/src/validationRules.ts
similarity index 56%
rename from src/validationRules.js
rename to src/validationRules.ts
index 2c8e620f..4c72ae9a 100644
--- a/src/validationRules.js
+++ b/src/validationRules.ts
@@ -1,23 +1,25 @@
-const isExisty = value => value !== null && value !== undefined;
-const isEmpty = value => value === '';
+import { IValidationFunction, IValue, IValues } from './interfaces';
 
-const validations = {
-  isDefaultRequiredValue(values, value) {
+const isExisty = (value: IValue) => value !== null && value !== undefined;
+const isEmpty = (value: IValue) => value === '';
+
+const validations: { [key: string]: IValidationFunction } = {
+  isDefaultRequiredValue(_values: IValues, value: IValue) {
     return value === undefined || value === null || value === '';
   },
-  isExisty(_values, value) {
+  isExisty(_values: IValues, value: IValue) {
     return isExisty(value);
   },
-  matchRegexp(_values, value, regexp) {
+  matchRegexp(_values: IValues, value: IValue, regexp: RegExp) {
     return !isExisty(value) || isEmpty(value) || regexp.test(value);
   },
-  isUndefined(_values, value) {
+  isUndefined(_values: IValues, value: IValue) {
     return value === undefined;
   },
-  isEmptyString(_values, value) {
+  isEmptyString(_values: IValues, value: IValue) {
     return isEmpty(value);
   },
-  isEmail(values, value) {
+  isEmail(values: IValues, value: IValue) {
     // Regex from http://emailregex.com/
     return validations.matchRegexp(
       values,
@@ -25,52 +27,52 @@ const validations = {
       /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/i,
     );
   },
-  isUrl(values, value) {
+  isUrl(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^(?:\w+:)?\/\/([^\s.]+\.\S{2}|localhost[:?\d]*)\S*$/i);
   },
-  isTrue(_values, value) {
+  isTrue(_values: IValues, value: IValue) {
     return value === true;
   },
-  isFalse(values, value) {
+  isFalse(_values: IValues, value: IValue) {
     return value === false;
   },
-  isNumeric(values, value) {
+  isNumeric(values: IValues, value: IValue) {
     if (typeof value === 'number') {
       return true;
     }
     return validations.matchRegexp(values, value, /^[-+]?(?:\d*[.])?\d+$/);
   },
-  isAlpha(values, value) {
+  isAlpha(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^[A-Z]+$/i);
   },
-  isAlphanumeric(values, value) {
+  isAlphanumeric(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^[0-9A-Z]+$/i);
   },
-  isInt(values, value) {
+  isInt(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^(?:[-+]?(?:0|[1-9]\d*))$/);
   },
-  isFloat(values, value) {
+  isFloat(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^(?:[-+]?(?:\d+))?(?:\.\d*)?(?:[eE][+-]?(?:\d+))?$/);
   },
-  isWords(values, value) {
+  isWords(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^[A-Z\s]+$/i);
   },
-  isSpecialWords(values, value) {
+  isSpecialWords(values: IValues, value: IValue) {
     return validations.matchRegexp(values, value, /^[A-Z\s\u00C0-\u017F]+$/i);
   },
-  isLength(_values, value, length) {
+  isLength(_values: IValues, value: IValue, length: number) {
     return !isExisty(value) || isEmpty(value) || value.length === length;
   },
-  equals(_values, value, eql) {
+  equals(_values: IValues, value: IValue, eql: IValue) {
     return !isExisty(value) || isEmpty(value) || value === eql;
   },
-  equalsField(values, value, field) {
+  equalsField(values: IValues, value: IValue, field: string) {
     return value === values[field];
   },
-  maxLength(_values, value, length) {
+  maxLength(_values: IValues, value: IValue, length: number) {
     return !isExisty(value) || value.length <= length;
   },
-  minLength(_values, value, length) {
+  minLength(_values: IValues, value: IValue, length: number) {
     return !isExisty(value) || isEmpty(value) || value.length >= length;
   },
 };
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..249a30d0
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "lib": ["dom", "es5", "es6", "es7", "es2017.object"],
+    "outDir": "dist",
+    "sourceMap": true
+  },
+  "exclude": ["node_modules", "dist", "coverage"],
+  "include": ["src"]
+}
diff --git a/yarn.lock b/yarn.lock
index 25e0cdc9..9cb23130 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -352,6 +352,13 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"
 
+"@babel/plugin-syntax-typescript@^7.2.0":
+  version "7.3.3"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.3.3.tgz#a7cc3f66119a9f7ebe2de5383cce193473d65991"
+  integrity sha512-dGwbSMA1YhVS8+31CnPR7LB4pcbrzcV99wQzby4uAfrkZPYZlQ7ImwdpzLqi6Z6IL02b8IAL379CaMwo0x5Lag==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+
 "@babel/plugin-transform-arrow-functions@^7.2.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-arrow-functions/-/plugin-transform-arrow-functions-7.2.0.tgz#9aeafbe4d6ffc6563bf8f8372091628f00779550"
@@ -618,6 +625,14 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"
 
+"@babel/plugin-transform-typescript@^7.3.2":
+  version "7.4.5"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.4.5.tgz#ab3351ba35307b79981993536c93ff8be050ba28"
+  integrity sha512-RPB/YeGr4ZrFKNwfuQRlMf2lxoCUaU01MTw39/OFE/RiL8HDjtn68BwEPft1P7JN4akyEmjGWAMNldOV7o9V2g==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/plugin-syntax-typescript" "^7.2.0"
+
 "@babel/plugin-transform-unicode-regex@^7.4.4":
   version "7.4.4"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-unicode-regex/-/plugin-transform-unicode-regex-7.4.4.tgz#ab4634bb4f14d36728bf5978322b35587787970f"
@@ -700,6 +715,14 @@
     "@babel/plugin-transform-react-jsx-self" "^7.0.0"
     "@babel/plugin-transform-react-jsx-source" "^7.0.0"
 
+"@babel/preset-typescript@^7.3.3":
+  version "7.3.3"
+  resolved "https://registry.yarnpkg.com/@babel/preset-typescript/-/preset-typescript-7.3.3.tgz#88669911053fa16b2b276ea2ede2ca603b3f307a"
+  integrity sha512-mzMVuIP4lqtn4du2ynEfdO0+RYcslwrZiJHXu4MGaC1ctJiW2fyaeDrtjJGs7R/KebZ1sgowcIoWf4uRpEfKEg==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/plugin-transform-typescript" "^7.3.2"
+
 "@babel/register@^7.0.0":
   version "7.4.4"
   resolved "https://registry.yarnpkg.com/@babel/register/-/register-7.4.4.tgz#370a68ba36f08f015a8b35d4864176c6b65d7a23"
@@ -1038,6 +1061,19 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
+"@types/prop-types@*":
+  version "15.7.1"
+  resolved "https://registry.yarnpkg.com/@types/prop-types/-/prop-types-15.7.1.tgz#f1a11e7babb0c3cad68100be381d1e064c68f1f6"
+  integrity sha512-CFzn9idOEpHrgdw8JsoTkaDDyRWk1jrzIV8djzcgpq0y9tG4B4lFT+Nxh52DVpDXV+n4+NPNv7M1Dj5uMp6XFg==
+
+"@types/react@^16.8.22":
+  version "16.8.22"
+  resolved "https://registry.yarnpkg.com/@types/react/-/react-16.8.22.tgz#7f18bf5ea0c1cad73c46b6b1c804a3ce0eec6d54"
+  integrity sha512-C3O1yVqk4sUXqWyx0wlys76eQfhrQhiDhDlHBrjER76lR2S2Agiid/KpOU9oCqj1dISStscz7xXz1Cg8+sCQeA==
+  dependencies:
+    "@types/prop-types" "*"
+    csstype "^2.2.0"
+
 "@types/resolve@0.0.8":
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/@types/resolve/-/resolve-0.0.8.tgz#f26074d238e02659e323ce1a13d041eee280e194"
@@ -1879,6 +1915,7 @@ console-control-strings@^1.0.0, console-control-strings@~1.1.0:
 contains-path@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/contains-path/-/contains-path-0.1.0.tgz#fe8cf184ff6670b6baef01a9d4861a5cbec4120a"
+  integrity sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=
 
 content-type-parser@^1.0.1:
   version "1.0.2"
@@ -1997,6 +2034,11 @@ cssom@0.3.x, "cssom@>= 0.3.2 < 0.4.0":
   dependencies:
     cssom "0.3.x"
 
+csstype@^2.2.0:
+  version "2.6.5"
+  resolved "https://registry.yarnpkg.com/csstype/-/csstype-2.6.5.tgz#1cd1dff742ebf4d7c991470ae71e12bb6751e034"
+  integrity sha512-JsTaiksRsel5n7XwqPAfB0l3TFKdpjW/kgAELf9vrb5adGA7UCPLajKK5s3nFrcFm3Rkyp/Qkgl73ENc1UY3cA==
+
 currently-unhandled@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/currently-unhandled/-/currently-unhandled-0.4.1.tgz#988df33feab191ef799a61369dd76c17adf957ea"
@@ -2172,6 +2214,7 @@ discontinuous-range@1.0.0:
 doctrine@1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-1.5.0.tgz#379dce730f6166f76cefa4e6707a159b02c5a6fa"
+  integrity sha1-N53Ocw9hZvds76TmcHoVmwLFpvo=
   dependencies:
     esutils "^2.0.2"
     isarray "^1.0.0"
@@ -2410,7 +2453,7 @@ eslint-module-utils@^2.4.0:
     debug "^2.6.8"
     pkg-dir "^2.0.0"
 
-eslint-plugin-import@^2.7.0:
+eslint-plugin-import@^2.17.3:
   version "2.17.3"
   resolved "https://registry.yarnpkg.com/eslint-plugin-import/-/eslint-plugin-import-2.17.3.tgz#00548b4434c18faebaba04b24ae6198f280de189"
   integrity sha512-qeVf/UwXFJbeyLbxuY8RgqDyEKCkqV7YC+E5S5uOjAp4tOc8zj01JP3ucoBM8JcEqd1qRasJSg6LLlisirfy0Q==
@@ -4310,6 +4353,7 @@ listr@^0.14.3:
 load-json-file@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
+  integrity sha1-eUfkIUmvgNaWy/eXvKq8/h/inKg=
   dependencies:
     graceful-fs "^4.1.2"
     parse-json "^2.2.0"
@@ -5285,6 +5329,7 @@ path-to-regexp@^1.7.0:
 path-type@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-2.0.0.tgz#f012ccb8415b7096fc2daa1054c3d72389594c73"
+  integrity sha1-8BLMuEFbcJb8LaoQVMPXI4lZTHM=
   dependencies:
     pify "^2.0.0"
 
@@ -5450,7 +5495,7 @@ prop-types-exact@^1.2.0:
     object.assign "^4.1.0"
     reflect.ownkeys "^0.2.0"
 
-prop-types@^15.5.10, prop-types@^15.6.2, prop-types@^15.7.2:
+prop-types@^15.6.2, prop-types@^15.7.2:
   version "15.7.2"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
   integrity sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==
@@ -5557,6 +5602,7 @@ react-test-renderer@^16.0.0-0:
 read-pkg-up@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-2.0.0.tgz#6b72a8048984e0c41e79510fd5e9fa99b3b549be"
+  integrity sha1-a3KoBImE4MQeeVEP1en6mbO1Sb4=
   dependencies:
     find-up "^2.0.0"
     read-pkg "^2.0.0"
@@ -5588,6 +5634,7 @@ read-pkg-up@^5.0.0:
 read-pkg@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/read-pkg/-/read-pkg-2.0.0.tgz#8ef1c0623c6a6db0dc6713c4bfac46332b2368f8"
+  integrity sha1-jvHAYjxqbbDcZxPEv6xGMysjaPg=
   dependencies:
     load-json-file "^2.0.0"
     normalize-package-data "^2.3.2"
@@ -5867,14 +5914,14 @@ resolve@1.1.7:
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
   integrity sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=
 
-resolve@^1.1.7, resolve@^1.11.1, resolve@^1.3.2:
+resolve@^1.1.7, resolve@^1.11.0, resolve@^1.11.1, resolve@^1.3.2, resolve@^1.5.0:
   version "1.11.1"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.11.1.tgz#ea10d8110376982fef578df8fc30b9ac30a07a3e"
   integrity sha512-vIpgF6wfuJOZI7KKKSP+HmiKggadPQAdsp5HiC1mvqnfp0gF1vdwgBWZIdrVft9pgqoMFQN+R7BSWZiBxx+BBw==
   dependencies:
     path-parse "^1.0.6"
 
-resolve@^1.10.0, resolve@^1.10.1, resolve@^1.11.0, resolve@^1.5.0:
+resolve@^1.10.0, resolve@^1.10.1:
   version "1.11.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.11.0.tgz#4014870ba296176b86343d50b60f3b50609ce232"
   integrity sha512-WL2pBDjqT6pGUNSUzMw00o4T7If+z4H2x3Gz893WoUQ5KW8Vr9txp00ykiP16VBaZF5+j/OcXJHZ9+PCvdiDKw==
@@ -6639,6 +6686,11 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
+typescript@^3.5.2:
+  version "3.5.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.2.tgz#a09e1dc69bc9551cadf17dba10ee42cf55e5d56c"
+  integrity sha512-7KxJovlYhTX5RaRbUdkAXN1KUZ8PwWlTzQdHV6xNqvuFOs7+WBo10TQUqT19Q/Jz2hk5v9TQDIhyLhhJY4p5AA==
+
 uglify-js@^3.1.4:
   version "3.5.15"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.5.15.tgz#fe2b5378fd0b09e116864041437bff889105ce24"