feat: improve monorepo dev experience

packages/tsup-plugin/src/index.ts

@@ -0,0 +1,31 @@
+import {Options} from 'tsup';
+import {writeFile, stat} from 'fs/promises';
+import {bold, green} from 'colorette';
+
+type ArrayElement<ArrayType extends readonly unknown[]> = ArrayType extends readonly (infer ElementType)[]
+  ? ElementType
+  : never;
+
+export type Plugin = ArrayElement<Required<Options>['plugins']>;
+export type PluginContext = ThisParameterType<Required<Plugin>['buildEnd']>;
+
+/**
+ * Utility function for generating files in a TSUp plugin
+ */
+export function generateFiles(
+  label: string,
+  build: (this: PluginContext) => Promise<Record<string, string | Buffer>>,
+) {
+  return async function (this: PluginContext) {
+    this.logger.info(label, 'Build start');
+    const time = performance.now();
+    const result = await build.call(this);
+    this.logger.success(label, `⚡️ Build success in ${Math.floor(performance.now() - time)}ms`);
+    for (const file in result) {
+      const filePath = `${this.options.outDir}/${file}`;
+      await writeFile(filePath, result[file]);
+      const info = await stat(filePath);
+      this.logger.success(label, bold(filePath), green(`${(info.size / 1000).toFixed(2)} KB`));
+    }
+  };
+}