Build both esm and cjs

Author: dgreif

package.json

@@ -21,7 +21,9 @@
   ],
   "scripts": {
     "prebuild": "npm run clean && npm run lint && mkdir dist",
-    "build": "tsc",
+    "build": "npm run build:esm && npm run build:cjs",
+    "build:esm": "tsc",
+    "build:cjs": "tsc --module commonjs --outDir dist/cjs",
     "clean": "rm -rf dist",
     "lint": "eslint --report-unused-disable-directives . --color --ext .js,.ts,.tsx && tsc --noEmit",
     "prepublishOnly": "npm run build",

tsconfig.json

@@ -11,7 +11,7 @@
     "moduleResolution": "node",
     "declaration": true,
     "declarationMap": true,
-    "outDir": "dist",
+    "outDir": "dist/esm",
     "experimentalDecorators": true
   },
   "exclude": ["test", "dist"]