Version 0.52.0 release notes
k6 v0.52.0
is here 🎉! Some special mentions included in this release:
- We’ve switched to our own fork of
goja
namedsobek
. - Panics are no longer captured.
- We’ve added experimental support for TypeScript and ES6+.
k6/browser
has graduated from an experimental module, and now has a fully Async API.
Breaking changes
Switch goja
to our own fork named sobek
#3775
To accelerate the development speed and bring ECMAScript Modules (ESM) support to k6 earlier (https://github.com/grafana/k6/issues/3265),
we have decided to create a fork of the goja
project under the Grafana GitHub organization,
named sobek
.
Starting on this release, k6 (and its extensions) now use sobek
instead of the original goja
, for all (of the
publicly exposed parts of the API) except for a couple of packages that are only used internally by k6.
All k6 extensions linked in the docs have had a PR for this transition opened, as explained in this comment. Any extension author who hasn’t gotten a PR can follow the same steps.
Find further details in #3772 and #3773.
Panics are no longer being captured #3777
Since this release, Go panics are no longer being captured by k6. This means that if a panic occurs while running a test, the k6 process will crash, and the panic stack trace will be printed to the console.
We decided to change this behavior because it’s something that was left from the past as a safeguard, but it’s not as good as it might seem. For most cases with multiple goroutines/async, it’s not enough and also makes a bunch of potential bugs seem like less of an issue.
Thus, this will help us to identify and fix bugs earlier, improve the overall stability of k6, and most likely make the experience of developing k6 extensions friendlier.
lib.State
no longer has Group
#3750
As the result of refactoring the implementation of group
and check
methods, in order to decouple them, and thus
enable other future improvements, the lib.State
object no longer has a Group
field.
This change should not affect most users, except for a couple of extensions, for which the use of Group
was
already questionable:
xk6-fasthttp
xk6-g0
Other breaking changes
- #3797 starts using
-
as a special value for--archive-out
to output the archive to stdout. - browser#1318 makes the
Mouse.up
andMouse.down
methods no longer take x and y coordinates. Instead, they dispatch events on the current mouse position.
New features
Experimental support for TypeScript and ES6+ using esbuild #3738
This release of k6 introduces experimental support for TypeScript and ES6+ using esbuild, thanks to a new
compatibility mode named experimental_enhanced
.
k6 run --compatibility-mode=experimental_enhanced script.js
With this new compatibility mode, the test source code is transformed using esbuild instead of Babel, which also means that source files with the extension ".ts" are loaded by esbuild’s TypeScript loader, which results in partial TypeScript support: it removes the type information but doesn’t provide type safety.
k6/browser
has graduated from an experimental module #3793
The browser module is now available as k6/browser
instead of k6/experimental/browser
. The previous k6/experimental/browser
module will be removed on September 23rd, 2024. Refer to the migration guide for more information on how to update your scripts.
k6/browser
has now a fully Async API browser#428
This release introduces a fully Async API for the k6/browser
module. This means that nearly all the methods in the module now return promises. This change is part of the ongoing effort to make the browser module more user-friendly and easier to use. Please see the browser documentation for more information on how to use the new Async API.
Related Changes:
- browser#1310, browser#1311, browser#1312, browser#1316, browser#1328, browser#1337, browser#1367, browser#1366, browser#1314, browser#1332, browser#1323, browser#1355, browser#1348, browser#1364 Migrates
Browser
,BrowserContext
,ElementHandle
,Frame
,JSHandle
,Keyboard
,Locator
,Mouse
,Page
,Request
,Response
APIs to async.
For a full list of changes, including UX improvements and bug fixes, refer to full release notes.