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spy-js
#dddbne
@ArtemGovorov
@JetBrains
JavaScript tracing, debugging, profiling made simple with spy-js
piece of wisdom
the philosophy of JavaScript (to
the extent that it has any
philosophy) is that you should
not be able to observe what is
going on
demo
in a nutshell
javascript developer
opens a web page via smart proxy
!

the proxy injects some special code
into each script of the page
!

the script code executes and sends
runtime data back to the proxy
!

IDE gets notified when new event data
is available and can request full call
stack

typical JS dev
proxy
Local
virtually no configuration required,
but more fragile
!

System
OS/browser configuration required,
but more reliable
instrumentor

code + regular expression =

syntax tree
instrumentor
code parsing
AST traversing
AST modification
code generation
prettifying
parallel processing
quiz #1
Wrapping any loop statement into a block can not
break the loop code, true or false?
quiz #1
Wrapping any loop statement into a block can not
break the loop code, true or false?
tracer
cross-browser

simple

fast
tracer
fast, simple, cross-browser
tracer
app code
objects dumper

event queue

app code
timer
app code

back-end
quiz #2
Each function expression or function declaration in
JavaScript must have “function” keyword, true or
false?
quiz #2
Each function expression or function declaration in
JavaScript must have “function” keyword, true or
false?
back-end and UI
processing and persisting trace
!

serving UI and tracer requests

events tree

!

stack tree

infrastructure (sessions, proxy
and instrumentor hosting)

code
quiz #3
this is how spy-js works: my web page is
parsed into some tree using horse.js
framework and then the awesome cat
on the unicorn sends my data to the
WebStorm
quiz #3
this is how spy-js works: my web page is
parsed into some tree using horse.js
framework and then the awesome cat
on the unicorn sends my data to the
WebStorm

NO
quiz #3
javascript developer opens web page via proxy

the back-end proxy modifies requested javascript
files using instrumentor

the instrumentor changes the page code to collect
runtime data and injects tracer code

javascript developer executes some scenario on the
page (or runs tests) and the tracer sends collected
runtime data to the back-end

YES
future
nodejs, packaged javascript apps
!

collected runtime information analysis and presentation
!

advanced proxying
!

extensible instrumentation/code injection
when
WebStorm 8 EAP starts Jan 2014
!

visit spy-js.com to get a web UI based version today
questions
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JavaScript tracing, debugging, profiling made simple with spy-js