rollup done

jest.config.js

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   preset: 'ts-jest',
   testEnvironment: 'node',
   transform: {

package.json

@@ -1,15 +1,17 @@
 {
   "name": "@includedaniel/fibonacci",
-  "version": "1.0.14",
+  "version": "1.0.15",
   "description": "📦 package who finds a correspondent fibonacci term",
   "main": "dist/index.js",
+  "module": "dist/index.mjs",
   "types": "dist/index.d.ts",
+  "type": "module",
   "scripts": {
     "test": "jest --coverage",
     "lint": "eslint . --ext ts --ext tsx --ext js --ext snap",
     "type-check": "tsc --pretty --noEmit",
     "format": "prettier --write .",
-    "build": "tsc --project tsconfig.build.json"
+    "build": "rollup -c"
   },
   "files": [
     "dist"
@@ -37,6 +39,7 @@
   "devDependencies": {
     "@types/jest": "^29.5.2",
     "@typescript-eslint/eslint-plugin": "^5.43.0",
+    "esbuild": "^0.18.17",
     "eslint": "^8.0.1",
     "eslint-config-standard-with-typescript": "^34.0.1",
     "eslint-plugin-import": "^2.25.2",
@@ -45,6 +48,9 @@
     "eslint-plugin-promise": "^6.0.0",
     "jest": "^29.5.0",
     "prettier": "^2.8.8",
+    "rollup": "^3.27.0",
+    "rollup-plugin-dts": "^5.3.0",
+    "rollup-plugin-esbuild": "^5.0.0",
     "ts-jest": "^29.1.0",
     "typescript": "*"
   }

rollup.config.js

@@ -0,0 +1,36 @@
+import dts from 'rollup-plugin-dts'
+import esbuild from 'rollup-plugin-esbuild'
+import packageJson from './package.json' assert { type: 'json' }
+
+const name = packageJson.main.replace(/\.js$/, '')
+
+const bundle = config => ({
+  ...config,
+  input: 'src/index.ts',
+  external: id => !/^[./]/.test(id)
+})
+
+export default [
+  bundle({
+    plugins: [esbuild()],
+    output: [
+      {
+        file: `${name}.js`,
+        format: 'cjs',
+        sourcemap: true
+      },
+      {
+        file: `${name}.mjs`,
+        format: 'es',
+        sourcemap: true
+      }
+    ]
+  }),
+  bundle({
+    plugins: [dts()],
+    output: {
+      file: `${name}.d.ts`,
+      format: 'es'
+    }
+  })
+]

tsconfig.json

@@ -9,7 +9,7 @@
     // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
     // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
     /* Language and Environment */
-    "target": "ES5" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
+    "target": "esnext" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
     "lib": [
       "es6",
       "dom",