fix: dual package

package.json

@@ -11,14 +11,27 @@
     "url": "https://github.com/Gearbox-protocol/liquidator-v2-contracts"
   },
   "license": "BUSL-1.1",
-  "main": "dist/index.js",
+  "sideEffects": false,
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "types": "./dist/esm/index.d.mts",
+        "default": "./dist/esm/index.mjs"
+      },
+      "require": {
+        "types": "./dist/cjs/index.d.ts",
+        "default": "./dist/cjs/index.cjs"
+      }
+    }
+  },
   "files": [
     "contracts",
     "dist"
   ],
   "scripts": {
     "clean": "forge clean && rm -rf types dist",
-    "build": "forge build && yarn types && tsc",
+    "build": "forge build && yarn types && tsup",
     "types": "typechain --target ethers-v6 --out-dir ./src/generated ./forge-out/**/*.json",
     "forge-build": "forge clean && forge build",
     "prepare": "husky",
@@ -38,6 +51,7 @@
     "ethers": "^6.12.1",
     "husky": "^9.0.11",
     "lint-staged": "^15.2.2",
+    "tsup": "^8.0.2",
     "typechain": "^8.1.0",
     "typescript": "^5.4.5"
   },

tsup.config.ts

@@ -0,0 +1,28 @@
+import type { Options } from "tsup";
+import { defineConfig } from "tsup";
+
+export default defineConfig((options) => {
+  const commonOptions: Partial<Options> = {
+    entry: ["src/index.ts"],
+    clean: true,
+    dts: true,
+    splitting: false,
+    treeshake: true,
+    ...options,
+  };
+
+  return [
+    {
+      ...commonOptions,
+      format: "cjs",
+      outDir: "./dist/cjs/",
+      outExtension: () => ({ js: ".cjs" }),
+    },
+    {
+      ...commonOptions,
+      format: ["esm"],
+      outExtension: () => ({ js: ".mjs" }),
+      outDir: "./dist/esm/",
+    },
+  ];
+});