Replace @gilbarbara/esbuilder with tsup

package.json

@@ -25,8 +25,10 @@
   "main": "./dist/index.js",
   "module": "./dist/index.mjs",
   "exports": {
-    "import": "./dist/index.mjs",
-    "require": "./dist/index.js"
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.js"
+    }
   },
   "files": [
     "dist",
@@ -43,32 +45,46 @@
     "@types/jest": "^29.5.5",
     "@types/node": "^20.8.6",
     "del-cli": "^5.1.0",
+    "fix-tsup-cjs": "^1.2.0",
     "husky": "^8.0.3",
+    "is-ci-cli": "^2.2.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
     "prettier": "^3.0.3",
     "repo-tools": "^0.2.2",
     "size-limit": "^9.0.0",
     "ts-jest": "^29.1.1",
     "ts-node": "^10.9.1",
+    "tsup": "^7.2.0",
     "typescript": "^5.2.2"
   },
   "scripts": {
-    "build": "npm run clean && npm run build:files && npm run build:types",
-    "build:files": "esbuilder --cjs --esm",
-    "build:types": "tsc",
+    "build": "npm run clean && tsup && fix-tsup-cjs",
+    "watch": "tsup --watch",
     "clean": "del dist/*",
-    "watch": "npm run build:files -- --watch",
     "lint": "eslint src test",
-    "test": "jest",
+    "test": "is-ci \"test:coverage\" \"test:watch\"",
+    "typecheck": "tsc",
     "test:coverage": "jest --bail --coverage",
     "test:watch": "jest --watchAll --verbose",
     "format": "prettier \"**/*.{js,jsx,json,yml,yaml,css,less,scss,ts,tsx,md,graphql,mdx}\" --write",
-    "validate": "npm run lint && npm run test:coverage && npm run build && npm run size",
+    "validate": "npm run lint && npm run typecheck && npm run test:coverage && npm run build && npm run size",
     "size": "size-limit",
     "prepublishOnly": "npm run validate",
     "prepare": "husky install"
   },
+  "tsup": {
+    "dts": true,
+    "entry": [
+      "src/index.ts"
+    ],
+    "format": [
+      "cjs",
+      "esm"
+    ],
+    "sourcemap": true,
+    "splitting": false
+  },
   "eslintConfig": {
     "extends": [
       "@gilbarbara/eslint-config"