Add TypeScript definition (#32)

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

index.d.ts

@@ -0,0 +1,37 @@
+declare namespace ansiRegex {
+	interface Options {
+		/**
+		Match only the first ANSI escape.
+
+		@default false
+		*/
+		onlyFirst: boolean;
+	}
+}
+
+/**
+Regular expression for matching ANSI escape codes.
+
+@example
+```
+import ansiRegex = require('ansi-regex');
+
+ansiRegex().test('\u001B[4mcake\u001B[0m');
+//=> true
+
+ansiRegex().test('cake');
+//=> false
+
+'\u001B[4mcake\u001B[0m'.match(ansiRegex());
+//=> ['\u001B[4m', '\u001B[0m']
+
+'\u001B[4mcake\u001B[0m'.match(ansiRegex({onlyFirst: true}));
+//=> ['\u001B[4m']
+
+'\u001B]8;;https://github.com\u0007click\u001B]8;;\u0007'.match(ansiRegex());
+//=> ['\u001B]8;;https://github.com\u0007', '\u001B]8;;\u0007']
+```
+*/
+declare function ansiRegex(options?: ansiRegex.Options): RegExp;
+
+export = ansiRegex;

index.test-d.ts

@@ -0,0 +1,5 @@
+import {expectType} from 'tsd';
+import ansiRegex from '.';
+
+expectType<RegExp>(ansiRegex());
+expectType<RegExp>(ansiRegex({onlyFirst: true}));

package.json

@@ -13,11 +13,12 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava",
+		"test": "xo && ava && tsd",
 		"view-supported": "node fixtures/view-codes.js"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"ansi",
@@ -48,6 +49,7 @@
 	],
 	"devDependencies": {
 		"ava": "^1.4.1",
+		"tsd": "^0.9.0",
 		"xo": "^0.24.0"
 	}
 }