Don’t exit when stdin closes if using --watch=always

Author: thecrypticace

src/cli.js

@@ -62,7 +62,10 @@ let commands = {
     args: {
       '--input': { type: String, description: 'Input file' },
       '--output': { type: String, description: 'Output file' },
-      '--watch': { type: Boolean, description: 'Watch for changes and rebuild as needed' },
+      '--watch': {
+        type: oneOf(String, Boolean),
+        description: 'Watch for changes and rebuild as needed',
+      },
       '--poll': {
         type: Boolean,
         description: 'Use polling instead of filesystem events when watching',
@@ -175,13 +178,13 @@ let args = (() => {
 
       // --flag value syntax was used so we need to pull `value` from `args`
       if (flagValue === undefined) {
-      // Parse args for current flag
-      while (result['_'][offset] && !result['_'][offset].startsWith('-')) {
-        args.push(result['_'][offset++])
-      }
+        // Parse args for current flag
+        while (result['_'][offset] && !result['_'][offset].startsWith('-')) {
+          args.push(result['_'][offset++])
+        }
 
-      // Cleanup manually parsed flags + args
-      result['_'].splice(i, 1 + args.length)
+        // Cleanup manually parsed flags + args
+        result['_'].splice(i, 1 + args.length)
 
         // No args were provided, use default value defined in handler
         // One arg was provided, use that directly

src/cli/build/index.js

@@ -34,8 +34,12 @@ export async function build(args, configs) {
   let processor = await createProcessor(args, configPath)
 
   if (shouldWatch) {
-    /* Abort the watcher if stdin is closed to avoid zombie processes */
-    process.stdin.on('end', () => process.exit(0))
+    // Abort the watcher if stdin is closed to avoid zombie processes
+    // You can disable this behavior with --watch=always
+    if (args['--watch'] !== 'always') {
+      process.stdin.on('end', () => process.exit(0))
+    }
+
     process.stdin.resume()
 
     await processor.watch()