Add TypeScript types

Author: sindresorhus

index.d.ts

@@ -0,0 +1,9 @@
+/**
+A `setImmediate` shim.
+
+If the environment supports `setImmediate`, it uses that; otherwise, it falls back to `setTimeout` with a 0ms delay.
+*/
+export default function setImmediate<T extends any[]>(
+	callback: (...arguments_: T) => void,
+	...arguments_: T
+): void;

package.json

@@ -23,7 +23,8 @@
 		"test": "xo && ava"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"setimmediate",