feat: emit sourcemap

Author: yusukebe

package.json

@@ -1,15 +1,15 @@
 {
   "name": "@picojs/pico",
   "description": "Ultra-tiny web framework for Web-Standard runtime",
-  "version": "0.0.5",
+  "version": "0.0.4",
   "types": "dist/index.d.ts",
   "module": "dist/index.js",
   "files": [
     "dist"
   ],
   "scripts": {
     "test": "jest",
-    "esbuild": "esbuild --bundle --minify ./src/index.ts --outdir=./dist --format=esm",
+    "esbuild": "esbuild --bundle --minify ./src/index.ts --outdir=./dist --format=esm --sourcemap",
     "build": "rimraf dist && yarn esbuild && yarn tsc",
     "tsc": "tsc --emitDeclarationOnly --declaration",
     "lint": "eslint -c .eslintrc.js src/**.ts",
@@ -56,4 +56,4 @@
     "rimraf": "^3.0.2",
     "typescript": "^4.9.3"
   }
-}
+}