refactor(top-level): rewrite top level to typescript

@commitlint/top-level/index.d.ts

@@ -0,0 +1 @@
+export * from './lib';

@commitlint/top-level/index.js

@@ -0,0 +1 @@
+module.exports = require('./lib');

@commitlint/top-level/package.json

@@ -7,11 +7,11 @@
     "lib/"
   ],
   "scripts": {
-    "build": "cross-env NODE_ENV=production babel src --out-dir lib  --source-maps",
+    "build": "tsc",
     "deps": "dep-check",
     "pkg": "pkg-check",
     "start": "yarn watch",
-    "watch": "babel src --out-dir lib --watch --source-maps"
+    "watch": "tsc -w"
   },
   "babel": {
     "presets": [
@@ -42,12 +42,14 @@
   "license": "MIT",
   "devDependencies": {
     "@commitlint/utils": "^8.0.0",
+    "@types/node": "^12.0.4",
     "babel-cli": "6.26.0",
     "babel-preset-commitlint": "^8.0.0",
     "babel-register": "6.26.0",
-    "cross-env": "5.1.1"
+    "cross-env": "5.1.1",
+    "typescript": "^3.5.1"
   },
   "dependencies": {
-    "find-up": "^2.1.0"
+    "find-up": "^4.0.0"
   }
 }

@commitlint/top-level/src/index.ts

@@ -0,0 +1,17 @@
+import path from 'path';
+import up from 'find-up';
+
+export default toplevel;
+
+/**
+ * Find the next git root
+ */
+async function toplevel(cwd: string) {
+	const found = await up('.git', { cwd, type: 'directory' });
+
+	if (typeof found !== 'string') {
+		return found;
+	}
+
+	return path.join(found, '..');
+}

@commitlint/top-level/tsconfig.json

@@ -0,0 +1,22 @@
+{
+	"compilerOptions": {
+		"lib": [
+			"dom",
+			"es2015"
+		],
+		"rootDir": "src",
+		"outDir": "lib",
+		"declaration": true,
+		"declarationMap": true,
+		"sourceMap": true,
+		"esModuleInterop": true,
+		"allowSyntheticDefaultImports": true,
+		"strict": true
+	},
+	"include": [
+		"./src"
+	],
+	"exclude": [
+		"./src/**/*.test.ts"
+	]
+}