Package Camino datatypes as built JS

package.json

@@ -4,22 +4,26 @@
   "private": true,
   "packageManager": "yarn@4.14.1",
   "type": "module",
+  "files": [
+    "dist/src"
+  ],
   "exports": {
     ".": {
-      "types": "./src/index.ts",
-      "default": "./src/index.ts"
+      "types": "./dist/src/index.d.ts",
+      "default": "./dist/src/index.js"
     },
     "./field-semantics": {
-      "types": "./src/field-semantics.ts",
-      "default": "./src/field-semantics.ts"
+      "types": "./dist/src/field-semantics.d.ts",
+      "default": "./dist/src/field-semantics.js"
     },
     "./crdt-automerge": {
-      "types": "./src/crdt-automerge.ts",
-      "default": "./src/crdt-automerge.ts"
+      "types": "./dist/src/crdt-automerge.d.ts",
+      "default": "./dist/src/crdt-automerge.js"
     }
   },
   "scripts": {
     "build": "tsc -p tsconfig.build.json",
+    "prepare": "yarn build",
     "test": "yarn build && node --test dist/test/*.test.js",
     "typecheck": "tsc --noEmit"
   },