diff --git a/esbuild/build.mjs b/esbuild/build.mjs
new file mode 100644
index 0000000..5dbb43b
--- /dev/null
+++ b/esbuild/build.mjs
@@ -0,0 +1,10 @@
+import { readFile } from "fs/promises";
+import esbuild from "esbuild";
+const { build } = esbuild;
+const entryPoint = "src/index.ts";
+const { main: cjs, module: esm } = JSON.parse(
+  await readFile(new URL("./package.json", import.meta.url))
+);
+const base = { entryPoints: [entryPoint], sourcemap: true, bundle: true };
+build({ ...base, outfile: esm, format: "esm" });
+build({ ...base, outfile: cjs, format: "cjs" });
diff --git a/esbuild/package.json b/esbuild/package.json
new file mode 100644
index 0000000..241f5e3
--- /dev/null
+++ b/esbuild/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "@kou029w/esbuild",
+  "version": "1.0.0",
+  "main": "dist/kou029w-esbuild.cjs.js",
+  "module": "dist/kou029w-esbuild.esm.js",
+  "sideEffects": false,
+  "author": "Kohei Watanabe <kou029w@gmail.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "esbuild": "^0.8.23"
+  },
+  "scripts": {
+    "build": "node --experimental-json-modules build.mjs"
+  },
+  "engines": {
+    "node": ">=14.x"
+  }
+}
diff --git a/esbuild/src/index.ts b/esbuild/src/index.ts
new file mode 100644
index 0000000..396c76b
--- /dev/null
+++ b/esbuild/src/index.ts
@@ -0,0 +1 @@
+export default "Hello! esbuild";
diff --git a/esbuild/yarn.lock b/esbuild/yarn.lock
new file mode 100644
index 0000000..cfdf300
--- /dev/null
+++ b/esbuild/yarn.lock
@@ -0,0 +1,8 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+esbuild@^0.8.23:
+  version "0.8.23"
+  resolved "https://registry.yarnpkg.com/esbuild/-/esbuild-0.8.23.tgz#8c4ccd3abb5f7b4ae9f31c571971517be4ae60d2"
+  integrity sha512-LkgCmotGnhVgRGxjDkTBBYrnJ5stcxK+40cEJGtXUS16hcAWy90cn1qjxKCogzLPJ75gW/L6ejly7VKrMstVGQ==