Addon-knobs: straight rename js => ts

This commit simply transitions the files from js to ts to make the commit history clearer afterwards. Expected not to type-check.

addons/knobs/package.json

@@ -17,7 +17,7 @@
   },
   "license": "MIT",
   "main": "dist/index.js",
-  "jsnext:main": "src/index.js",
+  "types": "dist/index.d.ts",
   "scripts": {
     "prepare": "node ../../scripts/prepare.js"
   },

addons/knobs/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "./src",
+    "types": ["webpack-env"]
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "src/__tests__/**/*"
+  ]
+}