Use esbuild to generate esm bundle

esbuild.config.mjs

@@ -0,0 +1,41 @@
+import chalk from "chalk";
+import { analyzeMetafile, build } from "esbuild";
+
+(async () => {
+  try {
+    const startTime = Date.now();
+    console.info(
+      chalk.bold(`🚀 ${chalk.blueBright("paths-filter")} Build\n`),
+    );
+
+    const result = await build({
+      entryPoints: ["./src/main.ts"],
+      outfile: "dist/index.mjs",
+      metafile: true,
+      bundle: true,
+      format: "esm",
+      platform: "node",
+      target: ["node20"],
+      treeShaking: true,
+      // Ensure require is properly defined: https://github.com/evanw/esbuild/issues/1921
+      banner: {
+        js:
+          "import { createRequire } from 'module';\n" +
+          "const require = createRequire(import.meta.url);",
+      },
+    });
+
+    const analysis = await analyzeMetafile(result.metafile);
+    console.info(`📝 Bundle Analysis:${analysis}`);
+
+    console.info(
+      `${chalk.bold.green("✔ Bundled successfully!")} (${
+        Date.now() - startTime
+      }ms)`,
+    );
+  } catch (error) {
+    console.error(`🧨 ${chalk.red.bold("Failed:")} ${error.message}`);
+    console.debug(`📚 ${chalk.blueBright.bold("Stack:")} ${error.stack}`);
+    process.exit(1);
+  }
+})();