Deferred: Give better stack diagnostics on exceptions

Ref gh-2736 The exception stack has the name of the immediately outer function where the exception occurred, which can be very handy for tracing errors. Since we already have the exception object we might as well use it.
jquery · May 12, 2016 · 07c11c0 · 07c11c0
1 parent b8bd481
commit 07c11c0
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Showing 2 changed files with 17 additions and 10 deletions.
diff --git a/src/deferred/exceptionHook.js b/src/deferred/exceptionHook.js
@@ -14,7 +14,7 @@ jQuery.Deferred.exceptionHook = function( error, stack ) {
 	// Support: IE 8 - 9 only
 	// Console exists when dev tools are open, which can happen at any time
 	if ( window.console && window.console.warn && error && rerrorNames.test( error.name ) ) {
-		window.console.warn( "jQuery.Deferred exception: " + error.message, stack );
+		window.console.warn( "jQuery.Deferred exception: " + error.message, error.stack, stack );
 	}
 };
 

diff --git a/test/unit/deferred.js b/test/unit/deferred.js
@@ -542,28 +542,30 @@ QUnit.test( "jQuery.Deferred.then - spec compatibility", function( assert ) {
 	} catch ( _ ) {}
 } );
 
+// Test fails in IE9 but is skipped there because console is not active
 QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook", function( assert ) {
 
-	assert.expect( 1 );
+	assert.expect( 2 );
 
 	var done = assert.async(),
 		defer = jQuery.Deferred(),
 		oldWarn = window.console.warn;
 
-	window.console.warn = function( msg ) {
+	window.console.warn = function() {
 
 		// Support: Chrome <=41 only
 		// Some Chrome versions newer than 30 but older than 42 display the "undefined is
 		// not a function" error, not mentioning the function name. This has been fixed
 		// in Chrome 42. Relax this test there.
 		// This affects our Android 5.0 & Yandex.Browser testing.
-		var oldChromium = false;
+		var msg = Array.prototype.join.call( arguments, " " ),
+			oldChromium = false;
 		if ( /chrome/i.test( navigator.userAgent ) ) {
 			oldChromium = parseInt(
 					navigator.userAgent.match( /chrome\/(\d+)/i )[ 1 ], 10 ) < 42;
 		}
 		if ( oldChromium ) {
-			assert.ok( /(?:barf|undefined)/.test( msg ), "Message: " + msg );
+			assert.ok( /(?:barf|undefined)/.test( msg ), "Message (weak assertion): " + msg );
 		} else {
 			assert.ok( /barf/.test( msg ), "Message: " + msg );
 		}
@@ -580,14 +582,17 @@ QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook", func
 			// Should NOT get an error
 			throw new Error( "Make me a sandwich" );
 		} ).then( null, jQuery.noop )
-	).then( function( ) {
+	).then( function barf( ) {
+		jQuery.thisDiesToo();
+	} ).then( null, function( ) {
 		window.console.warn = oldWarn;
 		done();
 	} );
 
 	defer.resolve();
 } );
 
+// Test fails in IE9 but is skipped there because console is not active
 QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook with stack hooks", function( assert ) {
 
 	assert.expect( 2 );
@@ -605,24 +610,26 @@ QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook with s
 		return "NO STACK FOR YOU";
 	};
 
-	window.console.warn = function( msg, stack ) {
+	window.console.warn = function() {
 
 		// Support: Chrome <=41 only
 		// Some Chrome versions newer than 30 but older than 42 display the "undefined is
 		// not a function" error, not mentioning the function name. This has been fixed
 		// in Chrome 42. Relax this test there.
 		// This affects our Android 5.0 & Yandex.Browser testing.
-		var oldChromium = false;
+		var msg = Array.prototype.join.call( arguments, " " ),
+			oldChromium = false;
 		if ( /chrome/i.test( navigator.userAgent ) ) {
 			oldChromium = parseInt(
 					navigator.userAgent.match( /chrome\/(\d+)/i )[ 1 ], 10 ) < 42;
 		}
 		if ( oldChromium ) {
-			assert.ok( /(?:cough_up_hairball|undefined)/.test( msg ), "Function mentioned: " + msg );
+			assert.ok( /(?:cough_up_hairball|undefined)/.test( msg ),
+				"Function mentioned (weak assertion): " + msg );
 		} else {
 			assert.ok( /cough_up_hairball/.test( msg ), "Function mentioned: " + msg );
 		}
-		assert.ok( /NO STACK FOR YOU/.test( stack ), "Stack trace included: " + stack );
+		assert.ok( /NO STACK FOR YOU/.test( msg ), "Stack trace included: " + msg );
 	};
 	defer.then( function() {
 		jQuery.cough_up_hairball();