From 7f54eec0736d28105d5a55a02e233d1a48db0f67 Mon Sep 17 00:00:00 2001
From: Alexander Early <alex@npmjs.com>
Date: Fri, 24 May 2019 11:20:56 -0700
Subject: [PATCH] fix: don't completely flatten arrays pushed to queue/cargo. 
 Fixes #1645

---
 lib/internal/queue.js | 22 ++++++++++++++++------
 test/queue.js         | 20 +++++++++++++++++++-
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/lib/internal/queue.js b/lib/internal/queue.js
index 0db96a8f4..01567aa5c 100644
--- a/lib/internal/queue.js
+++ b/lib/internal/queue.js
@@ -50,14 +50,10 @@ export default function queue(worker, concurrency, payload) {
             throw new Error('task callback must be a function');
         }
         q.started = true;
-        if (Array.isArray(data)) {
-            if (data.length === 0 && q.idle()) {
-                // call drain immediately if there are no tasks
-                return setImmediate(() => trigger('drain'));
-            }
+        /*if (Array.isArray(data)) {
 
             return data.map(datum => _insert(datum, insertAtFront, callback));
-        }
+        }*/
 
         var res;
 
@@ -151,6 +147,13 @@ export default function queue(worker, concurrency, payload) {
         started: false,
         paused: false,
         push (data, callback) {
+            if (Array.isArray(data)) {
+                if (data.length === 0 && q.idle()) {
+                    // call drain immediately if there are no tasks
+                    return setImmediate(() => trigger('drain'));
+                }
+                return data.map(datum => _insert(datum, false, callback))
+            }
             return _insert(data, false, callback);
         },
         kill () {
@@ -158,6 +161,13 @@ export default function queue(worker, concurrency, payload) {
             q._tasks.empty();
         },
         unshift (data, callback) {
+            if (Array.isArray(data)) {
+                if (data.length === 0 && q.idle()) {
+                    // call drain immediately if there are no tasks
+                    return setImmediate(() => trigger('drain'));
+                }
+                return data.map(datum => _insert(datum, true, callback))
+            }
             return _insert(data, true, callback);
         },
         remove (testFn) {
diff --git a/test/queue.js b/test/queue.js
index 5c31116c4..e9f3a787d 100644
--- a/test/queue.js
+++ b/test/queue.js
@@ -264,6 +264,24 @@ describe('queue', function(){
         done();
     });
 
+    it('push with arrays', (done) => {
+        const tasks = []
+        var q = async.queue((task, cb) => {
+            tasks.push(task)
+            cb()
+        }, 1);
+
+        q.push([[1, 2, 3], [4, 5, 6]])
+
+        q.drain(() => {
+            expect(tasks).to.eql([
+                [1, 2, 3],
+                [4, 5, 6]
+            ])
+            done()
+        })
+    })
+
     it('unshift', (done) => {
         var queue_order = [];
 
@@ -607,7 +625,7 @@ describe('queue', function(){
         });
 
         expect(q.started).to.equal(false);
-        q.push([]);
+        q.push('a');
         expect(q.started).to.equal(true);
         done();
     });