Add subpath imports (#1808)

babel.config.js

@@ -37,6 +37,7 @@ module.exports = function (api) {
         {
           alias: {
             // This needs to be mirrored in tsconfig.json
+            '#': './src',
             lib: './src/lib',
             platform: './src/platform',
             state: './src/state',

tsconfig.json

@@ -4,6 +4,7 @@
     "jsx": "react-jsx",
     "types": ["node"],
     "paths": {
+      "#/*": ["./src/*"],
       "lib/*": ["./src/lib/*"],
       "platform/*": ["./src/platform/*"],
       "state/*": ["./src/state/*"],