chore(core): Migrated core from rollup to esbuild

packages/core/build.js

@@ -0,0 +1,33 @@
+/* This script will build the package with esbuild */
+const esbuild = require('esbuild')
+const pkg = require('./package.json')
+
+// Create banner based on package info
+const banner = `/**
+ * ${pkg.name} | v${pkg.version}
+ * ${pkg.description}
+ * (c) ${new Date().getFullYear()} ${pkg.author}
+ * @license ${pkg.license}
+ */`
+
+// Shared esbuild options
+const options = {
+  banner: { js: banner },
+  bundle: true,
+  entryPoints: ['src/index.js'],
+  //minify: true,
+  sourcemap: true,
+}
+
+// Different formats
+const formats = {
+  esm: "dist/index.mjs",
+  cjs: "dist/index.js"
+}
+
+// Let esbuild generate different formats
+for (const [format, outfile] of Object.entries(formats)) esbuild
+  .build({ ...options, outfile, format })
+  .catch(() => process.exit(1))
+
+