fix(*): remove esm version

BREAKING CHANGE: shouldn't affect anybody, but if people relied on there being an ESM version
it is gone now

Signed-off-by: Will Soto <willsoto@users.noreply.github.com>

package.json

@@ -5,7 +5,6 @@
   "repository": "git://github.com/willsoto/nestjs-prometheus.git",
   "license": "Apache-2.0",
   "author": "Will Soto <willsoto@users.noreply.github.com> (https://github.com/willsoto)",
-  "exports": "./dist/esm.js",
   "main": "./dist/cjs.js",
   "typings": "./typings/index.d.ts",
   "files": [

rollup.config.js

@@ -6,7 +6,7 @@ import slugify from "@sindresorhus/slugify";
 import filesize from "rollup-plugin-filesize";
 import pkg from "./package.json";
 
-const formats = ["cjs", "esm"];
+const formats = ["cjs"];
 const globals = Object.keys(pkg.peerDependencies || {}).reduce(
   (obj, dependency) => {
     obj[dependency] = slugify(dependency);