Add type definitions for TypeScript (fixes #10)

package.json

@@ -19,9 +19,11 @@
     "registry": "https://registry.npmjs.org/"
   },
   "main": "lib/index.js",
+  "typings": "typings/index.d.ts",
   "files": [
     "lib",
-    "src"
+    "src",
+    "typings"
   ],
   "scripts": {
     "build": "babel src -d lib",

typings/index.d.ts

@@ -0,0 +1,38 @@
+import * as React from "react"
+
+type AsyncChildren<T> = ((state: AsyncState<T>) => React.ReactNode) | React.ReactNode
+
+interface AsyncProps<T> {
+  promiseFn?: (props: object) => Promise<T>
+  deferFn?: (...args) => Promise<T>
+  watch?: any
+  initialValue?: T
+  onResolve?: (data: T) => void
+  onError?: (error: Error) => void
+  children?: AsyncChildren<T>
+}
+
+interface AsyncState<T> {
+  initialValue?: T
+  data?: T
+  error?: Error
+  isLoading: boolean
+  startedAt?: Date
+  finishedAt?: Date
+  cancel: () => void
+  run: (...args) => Promise<T>
+  reload: () => void
+  setData: (data: T, callback?: () => void) => T
+  setError: (error: Error, callback?: () => void) => Error
+}
+
+declare class Async<T> extends React.Component<AsyncProps<T>, AsyncState<T>> {
+  static Pending: React.FunctionComponent<{ children?: AsyncChildren<T>; persist?: boolean }>
+  static Loading: React.FunctionComponent<{ children?: AsyncChildren<T>; initial?: boolean }>
+  static Resolved: React.FunctionComponent<{ children?: AsyncChildren<T>; persist?: boolean }>
+  static Rejected: React.FunctionComponent<{ children?: AsyncChildren<T>; persist?: boolean }>
+}
+
+declare function createInstance<T>(defaultProps?: AsyncProps<T>): Async<T>
+
+export default createInstance