fixup

Author: ronag

lib/internal/streams/utils.js

@@ -19,15 +19,6 @@ function isStream(obj) {
   return isReadable(obj) || isWritable(obj);
 }
 
-function isDuplexNodeStream(obj) {
-  return !!(
-    obj &&
-    (typeof obj.pipe === 'function' && obj._readableState) &&
-    typeof obj.on === 'function' &&
-    typeof obj.write === 'function'
-  );
-}
-
 function isReadableNodeStream(obj) {
   return !!(
     obj &&
@@ -47,6 +38,15 @@ function isWritableNodeStream(obj) {
   );
 }
 
+function isDuplexNodeStream(obj) {
+  return !!(
+    obj &&
+    (typeof obj.pipe === 'function' && obj._readableState) &&
+    typeof obj.on === 'function' &&
+    typeof obj.write === 'function'
+  );
+}
+
 function isNodeStream(obj) {
   return (
     obj &&
@@ -59,29 +59,79 @@ function isNodeStream(obj) {
   );
 }
 
+function isIterable(obj, isAsync) {
+  if (obj == null) return false;
+  if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
+  if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
+  return typeof obj[SymbolAsyncIterator] === 'function' ||
+    typeof obj[SymbolIterator] === 'function';
+}
+
 function isDestroyed(stream) {
   if (!isNodeStream(stream)) return null;
   const wState = stream._writableState;
   const rState = stream._readableState;
   const state = wState || rState;
-  return !!(stream.destroyed || state?.destroyed);
+  return !!(stream.destroyed || stream[kDestroyed] || state?.destroyed);
 }
 
-function isIterable(obj, isAsync) {
-  if (obj == null) return false;
-  if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
-  if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
-  return typeof obj[SymbolAsyncIterator] === 'function' ||
-    typeof obj[SymbolIterator] === 'function';
+// Have been end():d.
+function isWritableEnded(stream) {
+  if (!isWritableNodeStream(stream)) return null;
+  if (stream.writableEnded === true) return true;
+  const wState = stream._writableState;
+  if (wState?.errored) return false;
+  if (typeof wState?.ended !== 'boolean') return null;
+  return wState.ended;
+}
+
+// Have emitted 'finish'.
+function isWritableFinished(stream, strict) {
+  if (!isWritableNodeStream(stream)) return null;
+  if (stream.writableFinished === true) return true;
+  const wState = stream._writableState;
+  if (wState?.errored) return false;
+  if (typeof wState?.finished !== 'boolean') return null;
+  return !!(
+    wState.finished ||
+    (strict === false && wState.ended === true && wState.length === 0)
+  );
+}
+
+// Have been push(null):d.
+function isReadableEnded(stream) {
+  if (!isReadableNodeStream(stream)) return null;
+  if (stream.readableEnded === true) return true;
+  const rState = stream._readableState;
+  if (!rState || rState.errored) return false;
+  if (typeof rState?.ended !== 'boolean') return null;
+  return rState.ended;
+}
+
+// Have emitted 'end'.
+function isReadableFinished(stream, strict) {
+  if (!isReadableNodeStream(stream)) return null;
+  const rState = stream._readableState;
+  if (rState?.errored) return false;
+  if (typeof rState?.endEmitted !== 'boolean') return null;
+  return !!(
+    rState.endEmitted ||
+    (strict === false && rState.ended === true && rState.length === 0)
+  );
 }
 
 module.exports = {
+  isStream,
   isDestroyed,
-  isReadableNodeStream,
-  isWritableNodeStream,
   isDuplexNodeStream,
-  isNodeStream,
   isIterable,
   isReadable,
-  isStream,
+  isReadableNodeStream,
+  isReadableEnded,
+  isReadableFinished,
+  isNodeStream,
+  isWritable,
+  isWritableNodeStream,
+  isWritableEnded,
+  isWritableFinished,
 };