我怎样才能看到在黄瓜JS错误的头？
我正在尝试使用一个咕噜触发的Cucumber JS任务与nodeJS的一些BDD，这是工作正常，但我不想看到一个testing，我知道当然会失败，完整的JSexception堆栈。 相反，我宁愿只看到exception的（更有用的）头。 这看起来可能微不足道，但我相信BDD最好的实现是通过这些工具的快速反馈。 作为一个例子，下面是来自一个模块的基本缺失方法的完整堆栈跟踪：
TypeError: Object #<Object> has no method 'delete' at World.<anonymous> ($HOME/features/step_definitions/delete-item.steps.js:20:21) at Object.invoke ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/step_definition.js:84:14) at Object.execute ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:157:22) at Object.acceptVisitor ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:149:12) at Object.executeStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:178:12) at Object.processStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:173:14) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:66:16 at callUserFunctionAndBroadcastAfterEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:90:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at onRuntimeListenersComplete ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:113:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:16:7 at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:15:18) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:118:51 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at Object.broadcastEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:109:7) at Object.broadcastBeforeEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:100:12) at Object.broadcastEventAroundUserFunction ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:84:12) at Object.visitStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:63:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:95:17 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at onRuntimeListenersComplete ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:113:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:16:7 at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:15:18) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:118:51 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at Object.broadcastEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:109:7) at Object.broadcastAfterEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:105:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:95:32 at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at onRuntimeListenersComplete ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:113:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at handleStepResult ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:27:5) at hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:6:9) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:16:7 at handleStepResult ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/stats_journal.js:39:5) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:6:9) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:15:18) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:118:51 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at Object.broadcastEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:109:7) at Object.visitStepResult ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:79:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:150:17 at codeCallback ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/step_definition.js:61:11) at World.<anonymous> ($HOME/features/step_definitions/delete-item.steps.js:16:3) at Object.invoke ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/step_definition.js:84:14) at Object.execute ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:157:22) at Object.acceptVisitor ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:149:12) at Object.executeStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:178:12) at Object.processStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:173:14) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:66:16 at callUserFunctionAndBroadcastAfterEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:90:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at onRuntimeListenersComplete ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:113:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:16:7 at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:15:18) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:118:51 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at Object.broadcastEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:109:7) at Object.broadcastBeforeEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:100:12) at Object.broadcastEventAroundUserFunction ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:84:12) at Object.visitStep ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:63:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:95:17 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at Object.instructVisitorToVisitSteps ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:94:13) at Object.instructVisitorToVisitScenarioSteps ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:90:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:75:14 at Object.instructVisitorToVisitBackgroundSteps ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:85:9) at Object.acceptVisitor ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/scenario.js:74:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:48:41 at callUserFunction ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/library/hooker.js:41:11) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at Object.triggerBeforeHooks ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/library/hooker.js:63:19) at callBeforeHooks ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/library/hooker.js:37:16) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at hookedUpFunction ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/library/hooker.js:27:21) at callUserFunctionAndBroadcastAfterEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:90:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at onRuntimeListenersComplete ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:113:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:14:11) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:20:11 at hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:8:9) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:16:7 at handleBeforeScenarioEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/stats_journal.js:24:5) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener.js:6:9) at Object.hear ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/listener/summary_formatter.js:15:18) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:118:51 at processItem ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:19:9) at iterate ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:12:11) at Object.forEach ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/type/collection.js:23:7) at broadcastToListeners ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:117:19) at Object.broadcastEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:109:7) at Object.broadcastBeforeEvent ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:100:12) at Object.broadcastEventAroundUserFunction ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:84:12) at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/runtime/ast_tree_walker.js:52:14 at $HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/library.js:71:11 at process._tickCallback (node.js:419:13) at Function.Module.runMain (module.js:499:11) at startup (node.js:119:16) at node.js:906:3 然后是更有用的，但仍然不明确：
Failing scenarios: $HOME/features/delete-item.feature:6 # Scenario: Item removed from portfolio $HOME/features/delete-item.feature:11 # Scenario: Item not accessible from portfolio 4 scenarios (2 failed, 2 passed) 12 steps (2 failed, 2 skipped, 8 passed)
真的，我在大多数情况下唯一关心的是前四行：
TypeError: Object #<Object> has no method 'delete' at World.<anonymous> ($HOME/features/step_definitions/delete-item.steps.js:20:21) at Object.invoke ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/support_code/step_definition.js:84:14) at Object.execute ($HOME/node_modules/grunt-cucumber/node_modules/cucumber/lib/cucumber/ast/step.js:157:22)
有任何想法吗？
您可以绝对限制节点中收集的堆栈跟踪的大小。
在您的代码中，设置以下内容以仅logging错误消息（标题），而不logging堆栈跟踪
Error.stackTraceLimit = 0;
或者，只看到前四行（错误消息加上3个堆栈帧）使用
Error.stackTraceLimit = 3;
此值为节点提供了最大数量的堆栈帧，因此您可以在任何给定的上下文中将其设置为任何适合您的错误日志logging的目标。
如果您需要将其设置回来以随时收集完整的堆栈跟踪，则可以使用
Error.stackTraceLimit = Infinity;
UPDATE
你也可以看看使用hide-stack-frames-from
通过从堆栈轨迹中滤除不需要的帧，只留下相关的帧，而不是截断堆栈的相对过程替代scheme，并希望前n行将指向您根本问题。
例如，你可以用上面的代替行
require('hide-stack-frames-from')('cucumber', 'bluebird', 'superagent');
只要传递你想要过滤出来的任何模块的名字。