feat: rolldown watcher

package.json

@@ -85,7 +85,6 @@
   "dependencies": {
     "ansis": "catalog:prod",
     "cac": "catalog:prod",
-    "chokidar": "catalog:prod",
     "debug": "catalog:prod",
     "diff": "catalog:prod",
     "empathic": "catalog:prod",

pnpm-workspace.yaml

@@ -35,7 +35,6 @@ catalogs:
   prod:
     ansis: ^4.1.0
     cac: ^6.7.14
-    chokidar: ^4.0.3
     debug: ^4.4.1
     diff: ^8.0.2
     empathic: ^2.0.0

src/features/watch.ts

@@ -1,55 +1,46 @@
-import { blue } from 'ansis'
-import { debounce, toArray } from '../utils/general'
-import { logger } from '../utils/logger'
+import { resolveComma, toArray } from '../utils/general'
+import { logger, prettyName } from '../utils/logger'
 import type { ResolvedOptions } from '../options'
-import type { FSWatcher } from 'chokidar'
+import type { OutputAsset, OutputChunk, Plugin } from 'rolldown'
 
-const endsWithConfig = /[\\/](?:package\.json|tsdown\.config.*)$/
+const endsWithConfig = /[\\/]tsdown\.config.*$/
 
-export async function watchBuild(
+export function WatchPlugin(
+  chunks: Array<OutputChunk | OutputAsset>,
   options: ResolvedOptions,
   configFiles: string[],
-  rebuild: () => void,
   restart: () => void,
-): Promise<FSWatcher> {
-  if (typeof options.watch === 'boolean' && options.outDir === options.cwd) {
-    throw new Error(
-      `Watch is enabled, but output directory is the same as the current working directory.` +
-        `Please specify a different watch directory using ${blue`watch`} option,` +
-        `or set ${blue`outDir`} to a different directory.`,
-    )
+): Plugin {
+  return {
+    name: 'tsdown:watch',
+    options: options.ignoreWatch.length
+      ? (inputOptions) => {
+          inputOptions.watch ||= {}
+          inputOptions.watch.exclude = toArray(inputOptions.watch.exclude)
+          inputOptions.watch.exclude.push(...toArray(options.ignoreWatch))
+        }
+      : undefined,
+    buildStart() {
+      for (const file of configFiles) {
+        this.addWatchFile(file)
+      }
+      if (typeof options.watch !== 'boolean') {
+        for (const file of resolveComma(toArray(options.watch))) {
+          this.addWatchFile(file)
+        }
+      }
+    },
+    watchChange(id) {
+      if (configFiles.includes(id) || endsWithConfig.test(id)) {
+        logger.info(prettyName(options.name), `Reload config: ${id}`)
+        restart()
+      }
+    },
+    generateBundle: {
+      order: 'post',
+      handler(outputOptions, bundle) {
+        chunks.push(...Object.values(bundle))
+      },
+    },
   }
-
-  const files = toArray(
-    typeof options.watch === 'boolean' ? options.cwd : options.watch,
-  )
-  logger.info(`Watching for changes in ${files.join(', ')}`)
-  files.push(...configFiles)
-
-  const { watch } = await import('chokidar')
-  const debouncedRebuild = debounce(rebuild, 100)
-
-  const watcher = watch(files, {
-    ignoreInitial: true,
-    ignorePermissionErrors: true,
-    ignored: [
-      /[\\/]\.git[\\/]/,
-      /[\\/]node_modules[\\/]/,
-      options.outDir,
-      ...toArray(options.ignoreWatch),
-    ],
-  })
-
-  watcher.on('all', (type: string, file: string) => {
-    if (configFiles.includes(file) || endsWithConfig.test(file)) {
-      logger.info(`Reload config: ${file}`)
-      restart()
-      return
-    }
-
-    logger.info(`Change detected: ${type} ${file}`)
-    debouncedRebuild()
-  })
-
-  return watcher
 }