Switch to TypeScript

package.json

@@ -6,7 +6,7 @@
   "module": "dist/sourcemap-codec.es.js",
   "scripts": {
     "test": "mocha",
-    "build": "rm -rf dist && rollup -c",
+    "build": "rm -rf dist && rollup -c && tsc",
     "pretest": "npm run build",
     "prepublish": "npm test",
     "lint": "eslint src",
@@ -41,8 +41,9 @@
     "mocha": "^3.2.0",
     "remap-istanbul": "^0.9.5",
     "rollup": "^0.54.0",
-    "rollup-plugin-buble": "^0.15.0",
-    "rollup-plugin-node-resolve": "^3.0.0"
+    "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-typescript": "^0.8.1",
+    "typescript": "^2.6.2"
   },
   "files": [
     "src",

rollup.config.js

@@ -1,12 +1,15 @@
-import buble from 'rollup-plugin-buble';
+import typescript from 'rollup-plugin-typescript';
 import resolve from 'rollup-plugin-node-resolve';
 
 const pkg = require( './package.json' );
 
 export default {
-	input: 'src/sourcemap-codec.js',
+	input: 'src/sourcemap-codec.ts',
 	plugins: [
-		buble({ exclude: 'node_modules/**' }),
+		typescript({
+			exclude: 'node_modules/**',
+			typescript: require('typescript')
+		}),
 		resolve({ jsnext: true })
 	],
 	output: [{

tsconfig.json

@@ -0,0 +1,18 @@
+{
+	"compilerOptions": {
+		"noImplicitAny": true,
+		"diagnostics": true,
+		"noImplicitThis": true,
+		"noEmitOnError": true,
+		"target": "es5",
+		"lib": ["es5", "es6"],
+		"declaration": true,
+		"outDir": "dist/types"
+	},
+	"include": [
+		"src"
+	],
+	"exclude": [
+		"node_modules"
+	]
+}