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To maintain the stack trace across async calls, you don't have to do anything special. Note that callbacks which receive an error will have the first argument converted into an actual Error object (for example, if a string was passed). Thrown Errors will automatically get the previous stack trace appended to the stack.

For example:

    var asyncTask = function(callback) {
        process.nextTick(function() {
            callback(new Error('An error occured')); //Line 130

    asyncblock(function(flow) {
        flow.wait(); //Line 136

Stack trace:

Error: An error occured
    at Array.0 (.../sourcecode/asyncblock/test2.js:130:18) //<-- Error callback
    at EventEmitter._tickCallback (node.js:192:40)
=== Pre-async stack ===
    at .../sourcecode/asyncblock/asyncblock.js:71:67
    at .../sourcecode/asyncblock/asyncblock.js:90:9
    at Object.wait (.../sourcecode/asyncblock/asyncblock.js:109:27)
    at .../sourcecode/asyncblock/test2.js:136:10  //<-- The original call to flow.wait()
    at .../sourcecode/asyncblock/asyncblock.js:12:4