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42 lines
1.9 KiB
Markdown
42 lines
1.9 KiB
Markdown
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# stackback
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Returns an array of CallSite objects for a captured stacktrace. Useful if you want to access the frame for an error object.
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## use
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```javascript
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var stackback = require('stackback');
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// error generated from somewhere
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var err = new Error('some sample error');
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// stack is an array of CallSite objects
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var stack = stackback(err);
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```
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## CallSite object
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From the [V8 StackTrace API](https://code.google.com/p/v8/wiki/JavaScriptStackTraceApi)
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The structured stack trace is an Array of CallSite objects, each of which represents a stack frame. A CallSite object defines the following methods
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getThis: returns the value of this
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getTypeName: returns the type of this as a string. This is the name of the function stored in the constructor field of this, if available, otherwise the object's [[Class]] internal property.
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getFunction: returns the current function
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getFunctionName: returns the name of the current function, typically its name property. If a name property is not available an attempt will be made to try to infer a name from the function's context.
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getMethodName: returns the name of the property of this or one of its prototypes that holds the current function
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getFileName: if this function was defined in a script returns the name of the script
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getLineNumber: if this function was defined in a script returns the current line number
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getColumnNumber: if this function was defined in a script returns the current column number
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getEvalOrigin: if this function was created using a call to eval returns a CallSite object representing the location where eval was called
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isToplevel: is this a toplevel invocation, that is, is this the global object?
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isEval: does this call take place in code defined by a call to eval?
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isNative: is this call in native V8 code?
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isConstructor: is this a constructor call?
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## install
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```shell
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npm install stackback
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```
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