Generate both CommonJS and ES modules

package.json

@@ -2,8 +2,9 @@
   "name": "zod",
   "version": "2.0.0-beta.15",
   "description": "TypeScript-first schema declaration and validation library with static type inference",
-  "main": "./lib/src/index.js",
-  "types": "./lib/src/index.d.ts",
+  "main": "./lib/cjs/src/index.js",
+  "module": "./lib/esm/src/index.js",
+  "types": "./lib/esm/src/index.d.ts",
   "files": [
     "lib"
   ],
@@ -35,7 +36,7 @@
   ],
   "scripts": {
     "clean": "rm -rf lib/*",
-    "build": "yarn run clean && tsc --p tsconfig.package.json",
+    "build": "yarn run clean && tsc --p tsconfig.package.json && tsc --p tsconfig.commonjs.json",
     "buildall": "yarn add typescript@3.4 && yarn build && yarn add typescript@3.5 && yarn build && yarn add typescript@3.6 && yarn build && yarn add typescript@3.7 && yarn build && yarn add typescript@3.8 && yarn build && yarn add typescript@3.9 && yarn build && yarn add typescript@4 && yarn build && yarn add typescript@3.4",
     "buildallv2": "yarn add typescript@3.7 && yarn build && yarn add typescript@3.8 && yarn build && yarn add typescript@3.9 && yarn build && yarn add typescript@4.0 && yarn build && yarn add typescript@4.1 && yarn build && yarn add typescript@3.7",
     "format": "prettier --write \"src/**/*.ts\" \"src/**/*.js\"",

tsconfig.commonjs.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.package.json",
+  "compilerOptions": {
+    "module": "CommonJS",
+    "outDir": "./lib/cjs"
+  }
+}

tsconfig.json

@@ -8,15 +8,16 @@
       "dom"
     ],
     "target": "es5",
-    "module": "commonjs",
+    "module": "ESNext",
     "declaration": true,
-    "outDir": "./lib",
+    "outDir": "./lib/esm",
     "allowUnreachableCode": false,
     "allowUnusedLabels": false,
     "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "sourceMap": true,
+    "moduleResolution": "node",
     "resolveJsonModule": true,
     "strict": true,
     "skipLibCheck": true,