build: change to esbuild for bundling.

Author: Codex-

.eslintrc.json

@@ -11,6 +11,7 @@
     "coverage",
     "dist",
     "output",
+    "esbuild.config.mjs",
     "jest.config.ts"
   ],
   "parserOptions": {

esbuild.config.mjs

@@ -0,0 +1,68 @@
+import chalk from "chalk";
+import { analyzeMetafile, build } from "esbuild";
+import { readFile } from "fs/promises";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const nodeTarget = "node16";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const packageJsonPath = path.resolve(__dirname, "package.json");
+
+async function getExternals() {
+  const packageJson = JSON.parse(await readFile(packageJsonPath));
+
+  return Object.keys(packageJson.peerDependencies);
+}
+
+async function bundle(externalDeps, format, outDir) {
+  return build({
+    entryPoints: ["./src/index.ts"],
+    outfile: `${outDir}/index.js`,
+    metafile: true,
+    bundle: true,
+    format: format,
+    external: externalDeps,
+    platform: "node",
+    target: nodeTarget,
+    treeShaking: true,
+  });
+}
+
+(async () => {
+  try {
+    const startTime = Date.now();
+    console.info(
+      chalk.bold(
+        `🚀 ${chalk.blueBright("rollup-plugin-conditional-exec")} Build\n`
+      )
+    );
+
+    const externalDeps = await getExternals();
+
+    for (const [format, outDir] of [
+      ["cjs", "dist/cjs"],
+      ["esm", "dist/esm"],
+    ]) {
+      console.info(chalk.bold(`⚙️ Bundling: ${chalk.greenBright(format)}\n`));
+      const result = await bundle(externalDeps, format, outDir);
+
+      const analysis = await analyzeMetafile(result.metafile);
+      console.info(`📝 Bundle Analysis:${analysis}`);
+
+      console.info(
+        chalk.bold(chalk.greenBright(`✔ Bundling ${format} completed!\n`))
+      );
+    }
+
+    console.info(
+      `${chalk.bold.green("✔ Bundled package 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);
+  }
+})();