Merge branch 'dave-unclamp-safari' of https://github.com/dcsaszar/jasmine

* Significantly improves performance in Safari
* Merges #2040 from @dcsaszar
* Fixes #2008

lib/jasmine-core/jasmine.js

@@ -2876,7 +2876,8 @@ getJasmineRequireObj().clearStack = function(j$) {
   const maxInlineCallCount = 10;
 
   function browserQueueMicrotaskImpl(global) {
-    const { setTimeout, queueMicrotask } = global;
+    const unclampedSetTimeout = getUnclampedSetTimeout(global);
+    const { queueMicrotask } = global;
     let currentCallCount = 0;
     return function clearStack(fn) {
       currentCallCount++;
@@ -2885,7 +2886,7 @@ getJasmineRequireObj().clearStack = function(j$) {
         queueMicrotask(fn);
       } else {
         currentCallCount = 0;
-        setTimeout(fn);
+        unclampedSetTimeout(fn);
       }
     };
   }
@@ -2899,6 +2900,35 @@ getJasmineRequireObj().clearStack = function(j$) {
   }
 
   function messageChannelImpl(global) {
+    const { setTimeout } = global;
+    const postMessage = getPostMessage(global);
+
+    let currentCallCount = 0;
+    return function clearStack(fn) {
+      currentCallCount++;
+
+      if (currentCallCount < maxInlineCallCount) {
+        postMessage(fn);
+      } else {
+        currentCallCount = 0;
+        setTimeout(fn);
+      }
+    };
+  }
+
+  function getUnclampedSetTimeout(global) {
+    const { setTimeout } = global;
+    if (j$.util.isUndefined(global.MessageChannel)) return setTimeout;
+
+    const postMessage = getPostMessage(global);
+    return function unclampedSetTimeout(fn) {
+      postMessage(function() {
+        setTimeout(fn);
+      });
+    };
+  }
+
+  function getPostMessage(global) {
     const { MessageChannel, setTimeout } = global;
     const channel = new MessageChannel();
     let head = {};
@@ -2922,17 +2952,9 @@ getJasmineRequireObj().clearStack = function(j$) {
       }
     };
 
-    let currentCallCount = 0;
-    return function clearStack(fn) {
-      currentCallCount++;
-
-      if (currentCallCount < maxInlineCallCount) {
-        tail = tail.next = { task: fn };
-        channel.port2.postMessage(0);
-      } else {
-        currentCallCount = 0;
-        setTimeout(fn);
-      }
+    return function postMessage(fn) {
+      tail = tail.next = { task: fn };
+      channel.port2.postMessage(0);
     };
   }
 

spec/core/ClearStackSpec.js

@@ -20,6 +20,32 @@ describe('ClearStack', function() {
         MessageChannel: fakeMessageChannel
       };
     });
+
+    it('uses MessageChannel to reduce setTimeout clamping', function() {
+      const fakeChannel = fakeMessageChannel();
+      spyOn(fakeChannel.port2, 'postMessage');
+      const queueMicrotask = jasmine.createSpy('queueMicrotask');
+      const global = {
+        navigator: {
+          userAgent:
+            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.0.8 (KHTML, like Gecko) Version/15.1 Safari/605.0.8'
+        },
+        MessageChannel: function() {
+          return fakeChannel;
+        },
+        queueMicrotask
+      };
+
+      const clearStack = jasmineUnderTest.getClearStack(global);
+
+      for (let i = 0; i < 9; i++) clearStack(function() {});
+
+      expect(fakeChannel.port2.postMessage).not.toHaveBeenCalled();
+
+      clearStack(function() {});
+
+      expect(fakeChannel.port2.postMessage).toHaveBeenCalledTimes(1);
+    });
   });
 
   describe("in WebKit (Playwright's build for Windows)", function() {

src/core/ClearStack.js

@@ -2,7 +2,8 @@ getJasmineRequireObj().clearStack = function(j$) {
   const maxInlineCallCount = 10;
 
   function browserQueueMicrotaskImpl(global) {
-    const { setTimeout, queueMicrotask } = global;
+    const unclampedSetTimeout = getUnclampedSetTimeout(global);
+    const { queueMicrotask } = global;
     let currentCallCount = 0;
     return function clearStack(fn) {
       currentCallCount++;
@@ -11,7 +12,7 @@ getJasmineRequireObj().clearStack = function(j$) {
         queueMicrotask(fn);
       } else {
         currentCallCount = 0;
-        setTimeout(fn);
+        unclampedSetTimeout(fn);
       }
     };
   }
@@ -25,6 +26,35 @@ getJasmineRequireObj().clearStack = function(j$) {
   }
 
   function messageChannelImpl(global) {
+    const { setTimeout } = global;
+    const postMessage = getPostMessage(global);
+
+    let currentCallCount = 0;
+    return function clearStack(fn) {
+      currentCallCount++;
+
+      if (currentCallCount < maxInlineCallCount) {
+        postMessage(fn);
+      } else {
+        currentCallCount = 0;
+        setTimeout(fn);
+      }
+    };
+  }
+
+  function getUnclampedSetTimeout(global) {
+    const { setTimeout } = global;
+    if (j$.util.isUndefined(global.MessageChannel)) return setTimeout;
+
+    const postMessage = getPostMessage(global);
+    return function unclampedSetTimeout(fn) {
+      postMessage(function() {
+        setTimeout(fn);
+      });
+    };
+  }
+
+  function getPostMessage(global) {
     const { MessageChannel, setTimeout } = global;
     const channel = new MessageChannel();
     let head = {};
@@ -48,17 +78,9 @@ getJasmineRequireObj().clearStack = function(j$) {
       }
     };
 
-    let currentCallCount = 0;
-    return function clearStack(fn) {
-      currentCallCount++;
-
-      if (currentCallCount < maxInlineCallCount) {
-        tail = tail.next = { task: fn };
-        channel.port2.postMessage(0);
-      } else {
-        currentCallCount = 0;
-        setTimeout(fn);
-      }
+    return function postMessage(fn) {
+      tail = tail.next = { task: fn };
+      channel.port2.postMessage(0);
     };
   }