fix: use correct esm target

Author: n1ru4l

src/commands/build.ts

@@ -44,7 +44,7 @@ const filesToExcludeFromDist = [
 ];
 
 const moduleMappings = {
-  esm: "node16",
+  esm: "es2022",
   cjs: "commonjs",
 } as const;
 

test/integration.spec.ts

@@ -10,7 +10,7 @@ const binaryFolder = path.join(__dirname, "..", "dist", "index.js");
 it("can bundle a simple project", async () => {
   await fse.remove(path.resolve(fixturesFolder, "simple", "dist"));
   const result = await execa("node", [binaryFolder, "build"], {
-    cwd: path.resolve(fixturesFolder, "simple"),
+    cwd: path.resolve(fixturesFolder, "simple")
   });
   expect(result.exitCode).toEqual(0);
   const baseDistPath = path.resolve(fixturesFolder, "simple", "dist");
@@ -31,7 +31,7 @@ it("can bundle a simple project", async () => {
     "
   `);
   expect(fse.readFileSync(indexMjsFilePath, "utf8")).toMatchInlineSnapshot(`
-    "export const someNumber = 1;
+    "export var someNumber = 1;
     "
   `);
   expect(fse.readFileSync(packageJsonFilePath, "utf8")).toMatchInlineSnapshot(`
@@ -87,7 +87,7 @@ it("can build a monorepo project", async () => {
     path.resolve(fixturesFolder, "simple-monorepo", "b", "dist")
   );
   const result = await execa("node", [binaryFolder, "build"], {
-    cwd: path.resolve(fixturesFolder, "simple-monorepo"),
+    cwd: path.resolve(fixturesFolder, "simple-monorepo")
   });
   expect(result.exitCode).toEqual(0);
   const baseDistAPath = path.resolve(