Add typescript definitions

Author: charliecochran

.prettierignore

@@ -1,3 +1,4 @@
 dist
 node_modules
 *.md
+package.json

package.json

@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "description": "",
   "main": "dist/index.js",
+  "types": "src/index.d.ts",
   "scripts": {
     "build": "babel -d dist/ src/",
     "test": "echo \"Error: no test specified\" && exit 1"

src/index.d.ts

@@ -0,0 +1,30 @@
+interface Result<TData = any, TError = Error | string> {
+	data?: TData;
+	error?: TError;
+	loading: boolean;
+	refetch?(): void;
+}
+
+type AnyFunction = (...args: any[]) => any;
+type Callback<TParams = any[]> = (...args: TParams) => void;
+
+export function useAsyncCallback(asyncCallback: AnyFunction, deps?: ReadonlyArray<any>): [Callback, Result];
+export function useAsyncCallback<TData>(
+	asyncCallback: AnyFunction,
+	deps?: ReadonlyArray<any>,
+): [Callback, Result<TData>];
+export function useAsyncCallback<TData, TError>(
+	asyncCallback: AnyFunction,
+	deps?: ReadonlyArray<any>,
+): [Callback, Result<TData, TError>];
+export function useAsyncCallback<TData, TError, TCallback extends AnyFunction>(
+	asyncCallback: TCallback,
+	deps?: ReadonlyArray<any>,
+): [Callback<Parameters<TCallback>>, Result<TData, TError>];
+
+export function useAsyncEffect(asyncEffect: AnyFunction, deps?: ReadonlyArray<any>): Result;
+export function useAsyncEffect<TData>(asyncEffect: AnyFunction, deps?: ReadonlyArray<any>): Result<TData>;
+export function useAsyncEffect<TData, TError>(
+	asyncEffect: AnyFunction,
+	deps?: ReadonlyArray<any>,
+): Result<TData, TError>;