Fix asyncExitHook API documentation and example (#28)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

index.d.ts

@@ -56,7 +56,7 @@ throw new Error('🦄');
 //=> 'Exiting'
 
 // Removing an exit hook:
-const unsubscribe = asyncExitHook(() => {}, {});
+const unsubscribe = asyncExitHook(() => {}, {minimumWait: 500});
 
 unsubscribe();
 ```
@@ -77,7 +77,9 @@ import {asyncExitHook, gracefulExit} from 'exit-hook';
 
 asyncExitHook(() => {
 	console.log('Exiting');
-}, 500);
+}, {
+	minimumWait: 500
+});
 
 // Instead of `process.exit()`
 gracefulExit();

readme.md

@@ -52,24 +52,42 @@ Returns a function that removes the hook when called.
 
 #### onExit
 
-Type: `function(): void`
+Type: `() => void`
 
 The callback function to execute when the process exits.
 
-### asyncExitHook(onExit, minimumWait)
+### asyncExitHook(onExit, options)
 
 Register a function to run during `gracefulExit`.
 
 Returns a function that removes the hook when called.
 
 Please see [Async Notes](#asynchronous-exit-notes) for considerations when using the asynchronous API.
 
+#### onExit
+
+Type: `() => (void | Promise<void>)`
+
+The callback function to execute when the process exits via `gracefulExit`, and will be wrapped in `Promise.resolve`.
+
+#### options
+
+Type: `object`
+
+##### minimumWait
+
+Type: `number`
+
+The amount of time in milliseconds that the `onExit` function is expected to take.
+
 ```js
 import {asyncExitHook} from 'exit-hook';
 
 asyncExitHook(async () => {
 	console.log('Exiting');
-}, 300);
+}, {
+	minimumWait: 300
+});
 
 throw new Error('🦄');
 
@@ -90,20 +108,6 @@ const unsubscribe = asyncExitHook(async () => {
 unsubscribe();
 ```
 
-#### onExit
-
-Type: `function(): void | Promise<void>`
-
-The callback function to execute when the process exits via `gracefulExit`, and will be wrapped in `Promise.resolve`.
-
-#### options
-
-##### minimumWait
-
-Type: `number`
-
-The amount of time in milliseconds that the `onExit` function is expected to take.
-
 ### gracefulExit(signal?: number): void
 
 Exit the process and make a best-effort to complete all asynchronous hooks.