From 909844718e63b7ddc4037583e12905cc821c9419 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 13:59:38 +0100
Subject: [PATCH 1/9] events: simply on implementation

---
 lib/events.js                                 | 131 +++++-------------
 .../parallel/test-events-on-async-iterator.js |  75 +---------
 2 files changed, 38 insertions(+), 168 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index f722b17aecae0d..6749ab428fea02 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -976,13 +976,6 @@ async function once(emitter, name, options = {}) {
   });
 }
 
-const AsyncIteratorPrototype = ObjectGetPrototypeOf(
-  ObjectGetPrototypeOf(async function* () {}).prototype);
-
-function createIterResult(value, done) {
-  return { value, done };
-}
-
 function eventTargetAgnosticRemoveListener(emitter, name, listener, flags) {
   if (typeof emitter.removeListener === 'function') {
     emitter.removeListener(name, listener);
@@ -1017,80 +1010,15 @@ function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
  * @returns {AsyncIterator}
  */
 function on(emitter, event, options) {
+  const queue = [];
+  let resume = null;
+  let error = null;
+
   const signal = options?.signal;
   validateAbortSignal(signal, 'options.signal');
-  if (signal?.aborted)
+  if (signal?.aborted) {
     throw new AbortError(undefined, { cause: signal?.reason });
-
-  const unconsumedEvents = [];
-  const unconsumedPromises = [];
-  let error = null;
-  let finished = false;
-
-  const iterator = ObjectSetPrototypeOf({
-    next() {
-      // First, we consume all unread events
-      const value = unconsumedEvents.shift();
-      if (value) {
-        return PromiseResolve(createIterResult(value, false));
-      }
-
-      // Then we error, if an error happened
-      // This happens one time if at all, because after 'error'
-      // we stop listening
-      if (error) {
-        const p = PromiseReject(error);
-        // Only the first element errors
-        error = null;
-        return p;
-      }
-
-      // If the iterator is finished, resolve to done
-      if (finished) {
-        return PromiseResolve(createIterResult(undefined, true));
-      }
-
-      // Wait until an event happens
-      return new Promise(function(resolve, reject) {
-        unconsumedPromises.push({ resolve, reject });
-      });
-    },
-
-    return() {
-      eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
-      eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
-
-      if (signal) {
-        eventTargetAgnosticRemoveListener(
-          signal,
-          'abort',
-          abortListener,
-          { once: true });
-      }
-
-      finished = true;
-
-      for (const promise of unconsumedPromises) {
-        promise.resolve(createIterResult(undefined, true));
-      }
-
-      return PromiseResolve(createIterResult(undefined, true));
-    },
-
-    throw(err) {
-      if (!err || !(err instanceof Error)) {
-        throw new ERR_INVALID_ARG_TYPE('EventEmitter.AsyncIterator',
-                                       'Error', err);
-      }
-      error = err;
-      eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
-      eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
-    },
-
-    [SymbolAsyncIterator]() {
-      return this;
-    }
-  }, AsyncIteratorPrototype);
+  }
 
   eventTargetAgnosticAddListener(emitter, event, eventHandler);
   if (event !== 'error' && typeof emitter.on === 'function') {
@@ -1105,33 +1033,48 @@ function on(emitter, event, options) {
       { once: true });
   }
 
-  return iterator;
+  function errorHandler (err) {
+    error = err;
+    if (resume) {
+      resume(Promise.reject(err));
+      resume = null;
+    }
+  }
 
   function abortListener() {
     errorHandler(new AbortError(undefined, { cause: signal?.reason }));
   }
 
   function eventHandler(...args) {
-    const promise = ArrayPrototypeShift(unconsumedPromises);
-    if (promise) {
-      promise.resolve(createIterResult(args, false));
+    if (resume) {
+      resume(args);
+      resume = null;
     } else {
-      unconsumedEvents.push(args);
+      queue.push(args);
     }
   }
 
-  function errorHandler(err) {
-    finished = true;
+  return async function * () {
+    try {
+      while (true) {
+        while (queue.length) {
+          if (error) {
+            throw error;
+          }
+          yield queue.shift();
+        }
 
-    const toError = ArrayPrototypeShift(unconsumedPromises);
+        if (error) {
+          throw error;
+        }
 
-    if (toError) {
-      toError.reject(err);
-    } else {
-      // The next time we call next()
-      error = err;
+        yield await new Promise(resolve => {
+          resume = resolve;
+        });
+      }
+    } finally {
+      eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
+      eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
     }
-
-    iterator.return();
-  }
+  }()
 }
diff --git a/test/parallel/test-events-on-async-iterator.js b/test/parallel/test-events-on-async-iterator.js
index dbd27a8a44693e..e7d5c416eaeeab 100644
--- a/test/parallel/test-events-on-async-iterator.js
+++ b/test/parallel/test-events-on-async-iterator.js
@@ -25,7 +25,7 @@ async function basic() {
   for await (const event of iterable) {
     const current = expected.shift();
 
-    assert.deepStrictEqual(current, event);
+    assert.deepStrictEqual(event, current);
 
     if (expected.length === 0) {
       break;
@@ -113,39 +113,6 @@ async function throwInLoop() {
   assert.strictEqual(ee.listenerCount('error'), 0);
 }
 
-async function next() {
-  const ee = new EventEmitter();
-  const iterable = on(ee, 'foo');
-
-  process.nextTick(function() {
-    ee.emit('foo', 'bar');
-    ee.emit('foo', 42);
-    iterable.return();
-  });
-
-  const results = await Promise.all([
-    iterable.next(),
-    iterable.next(),
-    iterable.next(),
-  ]);
-
-  assert.deepStrictEqual(results, [{
-    value: ['bar'],
-    done: false
-  }, {
-    value: [42],
-    done: false
-  }, {
-    value: undefined,
-    done: true
-  }]);
-
-  assert.deepStrictEqual(await iterable.next(), {
-    value: undefined,
-    done: true
-  });
-}
-
 async function nextError() {
   const ee = new EventEmitter();
   const iterable = on(ee, 'foo');
@@ -177,44 +144,6 @@ async function nextError() {
   assert.strictEqual(ee.listeners('error').length, 0);
 }
 
-async function iterableThrow() {
-  const ee = new EventEmitter();
-  const iterable = on(ee, 'foo');
-
-  process.nextTick(() => {
-    ee.emit('foo', 'bar');
-    ee.emit('foo', 42); // lost in the queue
-    iterable.throw(_err);
-  });
-
-  const _err = new Error('kaboom');
-  let thrown = false;
-
-  assert.throws(() => {
-    // No argument
-    iterable.throw();
-  }, {
-    message: 'The "EventEmitter.AsyncIterator" property must be' +
-    ' an instance of Error. Received undefined',
-    name: 'TypeError'
-  });
-
-  const expected = [['bar'], [42]];
-
-  try {
-    for await (const event of iterable) {
-      assert.deepStrictEqual(event, expected.shift());
-    }
-  } catch (err) {
-    thrown = true;
-    assert.strictEqual(err, _err);
-  }
-  assert.strictEqual(thrown, true);
-  assert.strictEqual(expected.length, 0);
-  assert.strictEqual(ee.listenerCount('foo'), 0);
-  assert.strictEqual(ee.listenerCount('error'), 0);
-}
-
 async function eventTarget() {
   const et = new EventTarget();
   const tick = () => et.dispatchEvent(new Event('tick'));
@@ -370,9 +299,7 @@ async function run() {
     error,
     errorDelayed,
     throwInLoop,
-    next,
     nextError,
-    iterableThrow,
     eventTarget,
     errorListenerCount,
     nodeEventTarget,

From 893e88b96852bcf0075f5de66721da59664b1cf9 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 14:05:20 +0100
Subject: [PATCH 2/9] fixup

---
 lib/events.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index 6749ab428fea02..a306feea307ff4 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -24,7 +24,6 @@
 const {
   ArrayPrototypeIndexOf,
   ArrayPrototypeJoin,
-  ArrayPrototypeShift,
   ArrayPrototypeSlice,
   ArrayPrototypeSplice,
   ArrayPrototypeUnshift,
@@ -49,10 +48,10 @@ const {
   StringPrototypeSplit,
   Symbol,
   SymbolFor,
-  SymbolAsyncIterator,
 } = primordials;
 const kRejection = SymbolFor('nodejs.rejection');
 const { inspect } = require('internal/util/inspect');
+const FixedQueue = require('internal/fixed_queue');
 
 let spliceOne;
 
@@ -1010,7 +1009,7 @@ function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
  * @returns {AsyncIterator}
  */
 function on(emitter, event, options) {
-  const queue = [];
+  const queue = new FixedQueue();
   let resume = null;
   let error = null;
 
@@ -1057,7 +1056,7 @@ function on(emitter, event, options) {
   return async function * () {
     try {
       while (true) {
-        while (queue.length) {
+        while (!queue.isEmpty()) {
           if (error) {
             throw error;
           }

From fc717a8cac8a5d9eed85e1270f53632dee42ab92 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 14:06:07 +0100
Subject: [PATCH 3/9] fixup

---
 lib/events.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index a306feea307ff4..81de870f0868ac 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -1012,6 +1012,7 @@ function on(emitter, event, options) {
   const queue = new FixedQueue();
   let resume = null;
   let error = null;
+  let errored = false
 
   const signal = options?.signal;
   validateAbortSignal(signal, 'options.signal');
@@ -1034,6 +1035,8 @@ function on(emitter, event, options) {
 
   function errorHandler (err) {
     error = err;
+    errored = true;
+
     if (resume) {
       resume(Promise.reject(err));
       resume = null;
@@ -1057,13 +1060,13 @@ function on(emitter, event, options) {
     try {
       while (true) {
         while (!queue.isEmpty()) {
-          if (error) {
+          if (errored) {
             throw error;
           }
           yield queue.shift();
         }
 
-        if (error) {
+        if (errored) {
           throw error;
         }
 

From d8decf143e5fa43c7353ea7694912358adb5ead1 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 14:24:16 +0100
Subject: [PATCH 4/9] fixup

---
 lib/events.js | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index 81de870f0868ac..7b3f015ac94dd3 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -38,10 +38,7 @@ const {
   ObjectDefineProperty,
   ObjectDefineProperties,
   ObjectGetPrototypeOf,
-  ObjectSetPrototypeOf,
   Promise,
-  PromiseReject,
-  PromiseResolve,
   ReflectApply,
   ReflectOwnKeys,
   String,

From 87008a0ce209341047a71bd9f1133c403d6f0ce6 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 14:39:13 +0100
Subject: [PATCH 5/9] fixup

---
 lib/events.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/events.js b/lib/events.js
index 7b3f015ac94dd3..41c8db37afdde6 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -1074,6 +1074,14 @@ function on(emitter, event, options) {
     } finally {
       eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
       eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
+
+      if (signal) {
+        eventTargetAgnosticRemoveListener(
+          signal,
+          'abort',
+          abortListener,
+          { once: true });
+      }
     }
   }()
 }

From 0eeb646a6ea0f6c26a7d9c3d96ec140489c36721 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 18:04:24 +0100
Subject: [PATCH 6/9] fixup

---
 lib/events.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index 41c8db37afdde6..085218c879fed3 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -39,6 +39,7 @@ const {
   ObjectDefineProperties,
   ObjectGetPrototypeOf,
   Promise,
+  PromiseReject,
   ReflectApply,
   ReflectOwnKeys,
   String,
@@ -1030,12 +1031,12 @@ function on(emitter, event, options) {
       { once: true });
   }
 
-  function errorHandler (err) {
+  function errorHandler(err) {
     error = err;
     errored = true;
 
     if (resume) {
-      resume(Promise.reject(err));
+      resume(PromiseReject(err));
       resume = null;
     }
   }
@@ -1067,7 +1068,7 @@ function on(emitter, event, options) {
           throw error;
         }
 
-        yield await new Promise(resolve => {
+        yield await new Promise((resolve) => {
           resume = resolve;
         });
       }
@@ -1083,5 +1084,5 @@ function on(emitter, event, options) {
           { once: true });
       }
     }
-  }()
+  }();
 }

From d68a516437079b9e3af280a7ab4ae5e0decfa9f5 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 4 Feb 2022 18:40:39 +0100
Subject: [PATCH 7/9] fixup

---
 asd                                     | 361 ++++++++++++++++++++++++
 asd2                                    | 361 ++++++++++++++++++++++++
 benchmark/readline/readline-iterable.js |  47 +++
 lib/events.js                           |  23 +-
 4 files changed, 779 insertions(+), 13 deletions(-)
 create mode 100644 asd
 create mode 100644 asd2
 create mode 100644 benchmark/readline/readline-iterable.js

diff --git a/asd b/asd
new file mode 100644
index 00000000000000..7a19471b6e59fe
--- /dev/null
+++ b/asd
@@ -0,0 +1,361 @@
+"binary","filename","configuration","rate","time"
+"old","readline/readline-iterable.js","n=10",43853.2898066386,0.002531167
+"old","readline/readline-iterable.js","n=100",242729.3627130661,0.004535916
+"old","readline/readline-iterable.js","n=1000",777703.1564808596,0.014145500
+"old","readline/readline-iterable.js","n=10000",2159444.0463687317,0.050939500
+"old","readline/readline-iterable.js","n=100000",3268078.7725107293,0.336589500
+"old","readline/readline-iterable.js","n=1000000",3529462.432682505,3.116622208
+"new","readline/readline-iterable.js","n=10",43563.57927786499,0.002548000
+"new","readline/readline-iterable.js","n=100",238408.44498578968,0.004618125
+"new","readline/readline-iterable.js","n=1000",786940.324371637,0.013979459
+"new","readline/readline-iterable.js","n=10000",2258021.018166497,0.048715667
+"new","readline/readline-iterable.js","n=100000",3371055.5743626235,0.326307584
+"new","readline/readline-iterable.js","n=1000000",3494451.7314663343,3.147847458
+"old","readline/readline-iterable.js","n=10",44533.60080240722,0.002492500
+"old","readline/readline-iterable.js","n=100",240734.6671039685,0.004573500
+"old","readline/readline-iterable.js","n=1000",793496.3449831571,0.013863958
+"old","readline/readline-iterable.js","n=10000",2126016.881541562,0.051740417
+"old","readline/readline-iterable.js","n=100000",3225568.5637828,0.341025459
+"old","readline/readline-iterable.js","n=1000000",3579870.6495219083,3.072737000
+"new","readline/readline-iterable.js","n=10",44543.26897031612,0.002491959
+"new","readline/readline-iterable.js","n=100",262852.11977939523,0.004188667
+"new","readline/readline-iterable.js","n=1000",796714.4743632621,0.013807958
+"new","readline/readline-iterable.js","n=10000",2246968.565665354,0.048955291
+"new","readline/readline-iterable.js","n=100000",3401491.165987593,0.323387875
+"new","readline/readline-iterable.js","n=1000000",3658606.0238360655,3.006609875
+"old","readline/readline-iterable.js","n=10",47394.53861203173,0.002342042
+"old","readline/readline-iterable.js","n=100",237987.62334665068,0.004626291
+"old","readline/readline-iterable.js","n=1000",791166.0958322858,0.013904792
+"old","readline/readline-iterable.js","n=10000",2177073.6437944067,0.050527000
+"old","readline/readline-iterable.js","n=100000",3224474.517905369,0.341141167
+"old","readline/readline-iterable.js","n=1000000",3571089.275078835,3.080292917
+"new","readline/readline-iterable.js","n=10",30511.966050902207,0.003637917
+"new","readline/readline-iterable.js","n=100",239723.51452526363,0.004592791
+"new","readline/readline-iterable.js","n=1000",703178.9620820284,0.015644666
+"new","readline/readline-iterable.js","n=10000",2190187.896104324,0.050224458
+"new","readline/readline-iterable.js","n=100000",3434577.026369332,0.320272625
+"new","readline/readline-iterable.js","n=1000000",3641960.546644985,3.020351500
+"old","readline/readline-iterable.js","n=10",39927.45433342374,0.002780042
+"old","readline/readline-iterable.js","n=100",216347.20247936645,0.005089042
+"old","readline/readline-iterable.js","n=1000",618727.4473254901,0.017780042
+"old","readline/readline-iterable.js","n=10000",2148165.05701891,0.051206959
+"old","readline/readline-iterable.js","n=100000",3270262.00768361,0.336364792
+"old","readline/readline-iterable.js","n=1000000",3513899.2070847233,3.130425875
+"new","readline/readline-iterable.js","n=10",32082.853535703878,0.003459792
+"new","readline/readline-iterable.js","n=100",264097.4296435812,0.004168916
+"new","readline/readline-iterable.js","n=1000",757631.5834782459,0.014520250
+"new","readline/readline-iterable.js","n=10000",2224950.571149733,0.049439750
+"new","readline/readline-iterable.js","n=100000",3381994.3773041796,0.325252167
+"new","readline/readline-iterable.js","n=1000000",3584065.636617157,3.069140500
+"old","readline/readline-iterable.js","n=10",44441.49057560138,0.002497666
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+"old","readline/readline-iterable.js","n=1000",786331.0348583886,0.013990291
+"old","readline/readline-iterable.js","n=10000",2148544.441759222,0.051197917
+"old","readline/readline-iterable.js","n=100000",3305004.7115052743,0.332828875
+"old","readline/readline-iterable.js","n=1000000",3549075.338917507,3.099399125
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+"new","readline/readline-iterable.js","n=100000",3399220.2881771666,0.323603917
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+"old","readline/readline-iterable.js","n=10",41526.374859708194,0.002673000
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diff --git a/benchmark/readline/readline-iterable.js b/benchmark/readline/readline-iterable.js
new file mode 100644
index 00000000000000..6dc73b7669962a
--- /dev/null
+++ b/benchmark/readline/readline-iterable.js
@@ -0,0 +1,47 @@
+'use strict';
+const common = require('../common.js');
+const readline = require('readline');
+const { Readable } = require('stream');
+
+const bench = common.createBenchmark(main, {
+  n: [1e1, 1e2, 1e3, 1e4, 1e5, 1e6],
+});
+
+const loremIpsum = `Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+Dui accumsan sit amet nulla facilisi morbi tempus iaculis urna.
+Eget dolor morbi non arcu risus quis varius quam quisque.
+Lacus viverra vitae congue eu consequat ac felis donec.
+Amet porttitor eget dolor morbi non arcu.
+Velit ut tortor pretium viverra suspendisse.
+Mauris nunc congue nisi vitae suscipit tellus.
+Amet nisl suscipit adipiscing bibendum est ultricies integer.
+Sit amet dictum sit amet justo donec enim diam.
+Condimentum mattis pellentesque id nibh tortor id aliquet lectus proin.
+Diam in arcu cursus euismod quis viverra nibh.
+Rest of line`;
+
+function getLoremIpsumStream(repetitions) {
+  const readable = Readable({
+    objectMode: true,
+  });
+  let i = 0;
+  readable._read = () => readable.push(
+    i++ >= repetitions ? null : loremIpsum
+  );
+  return readable;
+}
+
+async function main({ n }) {
+  bench.start();
+  let lineCount = 0;
+
+  const iterable = readline.createInterface({
+    input: getLoremIpsumStream(n),
+  });
+
+  // eslint-disable-next-line no-unused-vars
+  for await (const _ of iterable) {
+    lineCount++;
+  }
+  bench.end(lineCount);
+}
diff --git a/lib/events.js b/lib/events.js
index 085218c879fed3..e8f9f567a3e385 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -1046,31 +1046,28 @@ function on(emitter, event, options) {
   }
 
   function eventHandler(...args) {
+    queue.push(args);
+
     if (resume) {
-      resume(args);
+      resume();
       resume = null;
-    } else {
-      queue.push(args);
     }
   }
 
   return async function * () {
     try {
       while (true) {
-        while (!queue.isEmpty()) {
-          if (errored) {
-            throw error;
-          }
-          yield queue.shift();
-        }
-
         if (errored) {
           throw error;
         }
 
-        yield await new Promise((resolve) => {
-          resume = resolve;
-        });
+        if (!queue.isEmpty()) {
+          yield queue.shift();
+        } else {
+          await new Promise((resolve) => {
+            resume = resolve;
+          });
+        }
       }
     } finally {
       eventTargetAgnosticRemoveListener(emitter, event, eventHandler);

From 659d3d82a60e52fccb16c09f0de3b080ebb48ea4 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Sat, 5 Feb 2022 14:14:54 +0100
Subject: [PATCH 8/9] fixup

---
 asd  | 361 -----------------------------------------------------------
 asd2 | 361 -----------------------------------------------------------
 2 files changed, 722 deletions(-)
 delete mode 100644 asd
 delete mode 100644 asd2

diff --git a/asd b/asd
deleted file mode 100644
index 7a19471b6e59fe..00000000000000
--- a/asd
+++ /dev/null
@@ -1,361 +0,0 @@
-"binary","filename","configuration","rate","time"
-"old","readline/readline-iterable.js","n=10",43853.2898066386,0.002531167
-"old","readline/readline-iterable.js","n=100",242729.3627130661,0.004535916
-"old","readline/readline-iterable.js","n=1000",777703.1564808596,0.014145500
-"old","readline/readline-iterable.js","n=10000",2159444.0463687317,0.050939500
-"old","readline/readline-iterable.js","n=100000",3268078.7725107293,0.336589500
-"old","readline/readline-iterable.js","n=1000000",3529462.432682505,3.116622208
-"new","readline/readline-iterable.js","n=10",43563.57927786499,0.002548000
-"new","readline/readline-iterable.js","n=100",238408.44498578968,0.004618125
-"new","readline/readline-iterable.js","n=1000",786940.324371637,0.013979459
-"new","readline/readline-iterable.js","n=10000",2258021.018166497,0.048715667
-"new","readline/readline-iterable.js","n=100000",3371055.5743626235,0.326307584
-"new","readline/readline-iterable.js","n=1000000",3494451.7314663343,3.147847458
-"old","readline/readline-iterable.js","n=10",44533.60080240722,0.002492500
-"old","readline/readline-iterable.js","n=100",240734.6671039685,0.004573500
-"old","readline/readline-iterable.js","n=1000",793496.3449831571,0.013863958
-"old","readline/readline-iterable.js","n=10000",2126016.881541562,0.051740417
-"old","readline/readline-iterable.js","n=100000",3225568.5637828,0.341025459
-"old","readline/readline-iterable.js","n=1000000",3579870.6495219083,3.072737000
-"new","readline/readline-iterable.js","n=10",44543.26897031612,0.002491959
-"new","readline/readline-iterable.js","n=100",262852.11977939523,0.004188667
-"new","readline/readline-iterable.js","n=1000",796714.4743632621,0.013807958
-"new","readline/readline-iterable.js","n=10000",2246968.565665354,0.048955291
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diff --git a/asd2 b/asd2
deleted file mode 100644
index ee90d145f3b987..00000000000000
--- a/asd2
+++ /dev/null
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-"new","readline/readline-iterable.js","n=10000",2596973.9626216213,0.042357375
-"new","readline/readline-iterable.js","n=100000",3842587.3908725386,0.286265708
-"new","readline/readline-iterable.js","n=1000000",3167992.507410402,3.472230750

From 5e6c085f67dcb4d568274f3ad2876988219856ba Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Sat, 5 Feb 2022 14:16:13 +0100
Subject: [PATCH 9/9] fixup

---
 lib/events.js | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index e8f9f567a3e385..db1aec8964eb6d 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -1010,7 +1010,7 @@ function on(emitter, event, options) {
   const queue = new FixedQueue();
   let resume = null;
   let error = null;
-  let errored = false
+  let errored = false;
 
   const signal = options?.signal;
   validateAbortSignal(signal, 'options.signal');
@@ -1035,10 +1035,8 @@ function on(emitter, event, options) {
     error = err;
     errored = true;
 
-    if (resume) {
-      resume(PromiseReject(err));
-      resume = null;
-    }
+    resume?.(PromiseReject(err));
+    resume = null;
   }
 
   function abortListener() {
@@ -1048,10 +1046,8 @@ function on(emitter, event, options) {
   function eventHandler(...args) {
     queue.push(args);
 
-    if (resume) {
-      resume();
-      resume = null;
-    }
+    resume?.();
+    resume = null;
   }
 
   return async function * () {