Add TypeScript definition (#16)

Author: BendingBender

.travis.yml

@@ -1,4 +1,5 @@
 language: node_js
 node_js:
+  - '12'
   - '10'
   - '8'

index.d.ts

@@ -0,0 +1,23 @@
+/**
+Regular expression for matching [semver](https://github.com/npm/node-semver) versions.
+
+@example
+```
+import semverRegex = require('semver-regex');
+
+semverRegex().test('v1.0.0');
+//=> true
+
+semverRegex().test('1.2.3-alpha.10.beta.0+build.unicorn.rainbow');
+//=> true
+
+semverRegex().exec('unicorn 1.0.0 rainbow')[0];
+//=> '1.0.0'
+
+'unicorn 1.0.0 and rainbow 2.1.3'.match(semverRegex());
+//=> ['1.0.0', '2.1.3']
+```
+*/
+declare function semverRegex(): RegExp;
+
+export = semverRegex;

index.test-d.ts

@@ -0,0 +1,4 @@
+import {expectType} from 'tsd';
+import semverRegex = require('.');
+
+expectType<RegExp>(semverRegex());

package.json

@@ -13,10 +13,11 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsd"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"semver",
@@ -30,6 +31,7 @@
 	],
 	"devDependencies": {
 		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
 		"xo": "^0.24.0"
 	}
 }