diff --git a/esbuild.js b/esbuild.cjs
similarity index 100%
rename from esbuild.js
rename to esbuild.cjs
diff --git a/package.json b/package.json
index faf88d8..ef369f7 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
 	"description": "module template",
 	"main": "lib/index.js",
 	"scripts": {
-		"build": "node ./esbuild.js",
+		"build": "node ./esbuild.cjs",
 		"prepare": "rm -rf @types && npm run typecheck && npm run build-declarations && npm run build",
 		"test": "mocha",
 		"build-declarations": "tsc --emitDeclarationOnly",
@@ -14,6 +14,7 @@
 		"test-reports": "npm run clean-coverage && nyc --reporter clover mocha --reporter xunit --reporter-option output=.xunit",
 		"coverage-html": "npm run test-reports && nyc report --reporter lcov && xdg-open coverage/lcov-report/index.html"
 	},
+	"type": "module",
 	"author": "",
 	"license": "ISC",
 	"devDependencies": {