Add TypeScript types

Author: sindresorhus

index.d.ts

@@ -0,0 +1,19 @@
+/**
+Slice a string with [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors_and_Styles)
+
+@param string - A string with ANSI escape codes. Like one styled by [`chalk`](https://github.com/chalk/chalk).
+@param startSlice - Zero-based index at which to start the slice.
+@param endSlice - Zero-based index at which to end the slice.
+
+@example
+```
+import chalk from 'chalk';
+import sliceAnsi from 'slice-ansi';
+
+const string = 'The quick brown ' + chalk.red('fox jumped over ') +
+	'the lazy ' + chalk.green('dog and then ran away with the unicorn.');
+
+console.log(sliceAnsi(string, 20, 30));
+```
+*/
+export default function sliceAnsi(string: string, startSlice: number, endSlice?: number): string;

package.json

@@ -6,15 +6,19 @@
 	"repository": "chalk/slice-ansi",
 	"funding": "https://github.com/chalk/slice-ansi?sponsor=1",
 	"type": "module",
-	"exports": "./index.js",
+	"exports": {
+		"types": "./index.d.ts",
+		"default": "./index.js"
+	},
 	"engines": {
-		"node": ">=14.16"
+		"node": ">=18"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsc index.d.ts"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"slice",