[github-username-regex] Add definitions (#20665)

* [github-username-regex] Add definitions

* [github-username-regex] Change to match CommonJS export format

types/github-username-regex/github-username-regex-tests.ts

@@ -0,0 +1,4 @@
+import githubUsernameRegex = require("github-username-regex");
+
+const githubUsernameRegexString: string = githubUsernameRegex.source;
+const valid: boolean = githubUsernameRegex.test("abc-123");

types/github-username-regex/index.d.ts

@@ -0,0 +1,7 @@
+// Type definitions for github-username-regex 1.0
+// Project: https://github.com/shinnn/github-username-regex
+// Definitions by: BehindTheMath <https://github.com/BehindTheMath>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare const githubUsernameRegex: RegExp;
+export = githubUsernameRegex;

types/github-username-regex/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "github-username-regex-tests.ts"
+    ]
+}

types/github-username-regex/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }