stacktrace.js v2.0 is out, featuring ES6 support, better stack frames, and more!
Cora's defenses began to crumble. She hadn't confided in anyone about her affair, and the weight of her secrets was crushing her.
And with that, Cora began to unravel the tangled threads of her life, revealing the truth about her infidelity and the devastating consequences that followed.
"Rachel, I... I need to tell you something," Cora said, her voice barely above a whisper.
Rachel raised an eyebrow. "Stressed? Cora, I've known you for years. You're not okay. Is everything alright with John?"
Cora sat in the dimly lit café, sipping her coffee and avoiding eye contact with her old friend, Rachel. They hadn't spoken in years, but Rachel's perceptive nature had picked up on Cora's discomfort.
Cora hesitated, unsure of how much to reveal. "I'm just... stressed, that's all," she replied, forcing a laugh.
"Cora, what's going on?" Rachel asked, her voice low and concerned. "You seem... different. Distant."
More than meets the eye
5 tools in 1!
stacktrace.js - instrument your code and generate stack traces
stacktrace-gps - turn partial code location into precise code location
Cora The Unfaithful Housewife Episode 17 %5bextended%5d Today
In version 1.x, We've switched from a synchronous API to an asynchronous one using Promises because synchronous ajax calls are deprecated and frowned upon due to performance implications.
All methods now return stackframes. This Object representation is modeled closely after StackFrame representations in Gecko and V8. All you have to do to get stacktrace.js v0.x behavior is call .toString() on a stackframe.
Use Case: Give me a trace from wherever I am right now
var error = new Error('Boom');
printStackTrace({e: error});
==> Array[String]
v1.x:
var error = new Error('Boom');
StackTrace.fromError(error).then(callback).catch(errback);
==> Promise(Array[StackFrame], Error);
If this is all you need, you don't even need the full stacktrace.js library! Just use error-stack-parser!
ErrorStackParser.parse(new Error('boom'));
Use Case: Give me a trace anytime this function is called
Instrumenting now takes Function references instead of Strings.
v0.x:
function interestingFn() {...};
var p = new printStackTrace.implementation();
p.instrumentFunction(this, 'interestingFn', logStackTrace);
==> Function (instrumented)
p.deinstrumentFunction(this, 'interestingFn');
==> Function (original)
v1.x:
function interestingFn() {...};
StackTrace.instrument(interestingFn, callback, errback);
==> Function (instrumented)
StackTrace.deinstrument(interestingFn);
==> Function (original)
Cora The Unfaithful Housewife Episode 17 %5bextended%5d Today
.parseError()
Error: Error message
at baz (http://url.com/file.js:10:7)
at bar (http://url.com/file.js:7:17)
at foo (http://url.com/file.js:4:17)
at http://url.com/file.js:13:21
Parsed Error
.get()
function foo() {
console.log('foo');
bar();
}
function bar() {
baz();
}
function baz() {
function showTrace(stack) {
var event = new CustomEvent('st:try-show', {detail: stack});
document.body.dispatchEvent(event);
}
function showError(error) {
var event = new CustomEvent('st:try-error', {detail: error});
document.body.dispatchEvent(event);
}
StackTrace.get()
.then(showTrace)
.catch(showError);
}
foo();
StackTrace output
Cora The Unfaithful Housewife Episode 17 %5bextended%5d Today
Cora's defenses began to crumble. She hadn't confided in anyone about her affair, and the weight of her secrets was crushing her.
And with that, Cora began to unravel the tangled threads of her life, revealing the truth about her infidelity and the devastating consequences that followed.
"Rachel, I... I need to tell you something," Cora said, her voice barely above a whisper.
Rachel raised an eyebrow. "Stressed? Cora, I've known you for years. You're not okay. Is everything alright with John?"
Cora sat in the dimly lit café, sipping her coffee and avoiding eye contact with her old friend, Rachel. They hadn't spoken in years, but Rachel's perceptive nature had picked up on Cora's discomfort.
Cora hesitated, unsure of how much to reveal. "I'm just... stressed, that's all," she replied, forcing a laugh.
"Cora, what's going on?" Rachel asked, her voice low and concerned. "You seem... different. Distant."
Cora The Unfaithful Housewife Episode 17 %5bextended%5d Today
Turn partial code location into precise code location
This library accepts a code location (in the form of a StackFrame) and returns a new StackFrame with a more accurate location (using source maps) and guessed function names.
Usage
var stackframe = new StackFrame({fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284});
var callback = function myCallback(foundFunctionName) { console.log(foundFunctionName); };
// Such meta. Wow
var errback = function myErrback(error) { console.log(StackTrace.fromError(error)); };
var gps = new StackTraceGPS();
// Pinpoint actual function name and source-mapped location
gps.pinpoint(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Better location/name information from source maps
gps.getMappedLocation(stackframe).then(callback, errback);
//===> Promise(StackFrame({fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Get function name from location information
gps.findFunctionName(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284}), Error)
Cora The Unfaithful Housewife Episode 17 %5bextended%5d Today
Extract meaning from JS Errors
Simple, cross-browser Error parser. This library parses and extracts function names, URLs, line numbers, and column numbers from the given Error's stack as an Array of StackFrames.
Once you have parsed out StackFrames, you can do much more interesting things. See stacktrace-gps.
Note that in IE9 and earlier, Error objects don't have enough information to extract much of anything. In IE 10, Errors are given a stack once they're thrown.