feat: build and package cjs version

package-fixup.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+cat >dist/cjs/package.json <<!EOF
+{
+    "type": "commonjs"
+}
+!EOF
+
+cat >dist/mjs/package.json <<!EOF
+{
+    "type": "module"
+}
+!EOF

package.json

@@ -13,10 +13,14 @@
   "engines": {
     "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
   },
-  "type": "module",
-  "main": "./dist/index.js",
+  "main": "./dist/cjs/index.js",
+  "module": "/dist/mjs/index.js",
   "exports": {
-    ".": "./dist/index.js"
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/mjs/index.js",
+      "require": "./dist/cjs/index.js"
+    }
   },
   "types": "./dist/index.d.ts",
   "files": [
@@ -29,7 +33,9 @@
     "lint": "npm run lint:base -- .",
     "typecheck": "tsc -p tsconfig.json --noEmit",
     "test": "jest",
-    "build": "tsc --build tsconfig.build.json"
+    "build:esm": "tsc --build tsconfig.mjs.json",
+    "build:cjs": "tsc --build tsconfig.cjs.json",
+    "build": "npm run build:esm && npm run build:cjs && ./package-fixup.sh"
   },
   "peerDependencies": {
     "react": ">=16.8",

tsconfig.cjs.json

@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "declarationDir": "dist",
+    "noEmit": false,
+    "module": "CommonJS",
+    "target": "ES6",
+    "lib": ["dom", "ES6"],
+    "outDir": "dist/cjs"
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}

tsconfig.build.json → tsconfig.mjs.json

@@ -3,7 +3,7 @@
   "compilerOptions": {
     "declarationDir": "dist",
     "noEmit": false,
-    "outDir": "dist",
+    "outDir": "dist/mjs",
     "rootDir": "src"
   },
   "include": [