MIGRATION_GUIDE.md

Migrating from v0.x to v1.x

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.

HEADS UP: StackTrace.JS does NOT provide a Promises polyfill by default, but we do distribute a version with polyfills! Check the Promises page on caniuse.com to determine if you need one.

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

v0.x:

printStackTrace();
//===> Array[String]

v1.x:

StackTrace.get().then(callback).catch(errback);
//===> Promise(Array[StackFrame], Error)

StackTrace.get() returns a Promise

Use Case: Parse this error

v0.x:

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)