Add types definitions

.eslintignore

@@ -0,0 +1 @@
+types/*

README.md

@@ -94,7 +94,7 @@ Set a function to be called after **a new file is selected**.
 
 <br>
 
-#### `customTabs: {[string]: CustomTabConstructor}`
+#### `customTabs: {[key: string]: CustomTabConstructor}`
 
 Add **custom tabs** for a widget.
 
@@ -129,15 +129,16 @@ receives a `fileInfo` object for each uploaded file and throws an exception if
 that file does not meet validation requirements.
 
 ```jsx
-const fileTypeLimit = (tps) => {
-  cosnt types = tps.split(' ')
-  return function(fileInfo) {
+const fileTypeLimit = (allowedFileTypes: string) => {
+  const types = allowedFileTypes.split(' ')
+
+  return function(fileInfo: FileInfo) {
     if (fileInfo.name === null) {
       return
     }
     const extension = fileInfo.name.split('.').pop()
 
-    if (!types.include(extension)) {
+    if (extension && !types.includes(extension)) {
       throw new Error('fileType')
     }
   }
@@ -154,7 +155,7 @@ const validators = [fileTypeLimit('mp3 avi mp4')];
 
 <br>
 
-#### `preloader: Component`
+#### `preloader: ComponentType`
 
 Set a custom **preloader**. Preloader is a Component to be shown while a widget
 is loading.

package.json

@@ -4,19 +4,22 @@
   "description": "React component for Uploadcare Widget",
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
+  "types": "types",
   "scripts": {
+    "lint:types": "dtslint types --onlyTestTsNext",
     "clean": "rimraf dist en",
     "build": "rollup -c",
     "dummy": "parcel dummy/index.html",
     "prepublishOnly": "npm run clean && npm run build",
-    "test:dev": "karma start karma.config.js",
-    "test": "karma start karma.config.js --single-run --nocache",
+    "test:dev": "npm run lint:types && karma start karma.config.js",
+    "test": "npm run lint:types && karma start karma.config.js --single-run --nocache",
     "release": "release-it"
   },
   "files": [
     "dist/*",
     "en/*",
-    "locales.js"
+    "locales.js",
+    "*.d.ts"
   ],
   "repository": {
     "type": "git",
@@ -62,8 +65,11 @@
     "@babel/preset-react": "^7.6.3",
     "@release-it/conventional-changelog": "^1.1.0",
     "@testing-library/react": "^9.3.0",
+    "@types/jquery": "^3.3.31",
+    "@types/react": "^16.9.11",
     "assert": "^2.0.0",
     "babel-eslint": "^10.0.3",
+    "dtslint": "^2.0.0",
     "eslint": "^6.4.0",
     "eslint-config-standard": "^14.1.0",
     "eslint-config-standard-jsx": "^8.1.0",