create commonjs build for SSR projects

Author: mmalfertheiner

package.json

@@ -11,9 +11,12 @@
   "license": "MIT",
   "private": false,
   "main": "dist/index.js",
+  "module": "dist/esm/index.js",
   "typings": "dist/index.d.ts",
   "scripts": {
-    "build": "tsc",
+    "build": "npm run build:node && npm run build:esm",
+    "build:node": "tsc",
+    "build:esm": "tsc --project tsconfig.esnext.json",
     "lint": "eslint --ext js,ts,tsx src",
     "lint:fix": "npm run lint -- --fix",
     "test": "jest --config jestconfig.json --passWithNoTests",

tsconfig.esnext.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "declaration": true,
+    "outDir": "./dist/esm",
+    "strict": true,
+    "esModuleInterop": true
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "**/__test__/*", "**/__tests__/*"]
+}

tsconfig.json

@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "module": "esnext",
     "moduleResolution": "node",
     "declaration": true,
     "outDir": "./dist",