AriPerkkio

@ariperkkio.dev

1239 Followers 189 Following

@vitest.dev Core Team • Open Source @chromatic.com • github.com/AriPerkkio

npmx timeline of ast-v8-to-istanbul package. Trusted publishing was removed on May 25th, and re-enabled on May 31st.
Test case validating Vitest's SummaryReporter using ansivision-package. Inline snapshot describes changes of test summary, showing test run progress.
Terminal output of Vitest's test run results. The results contain error message of asynchronous resource leaking. Code block pointing to a fetch call that is missing await.
Github organization invitation with text "You've been invited to the Storybook organization!".
Partial screenshot from Github issue with text: "Alternative Get someone from Vitest team into Istanbuljs organization and as maintainer of istanbuljs/istanbuljs package"
Two istanbul coverage reports side-by-side. Left one titled "vite@7 + esbuild", right one "vite@8-beta + rolldown + oxc". Report on the right demonstrates how ignore hints work without @preserve keyword.
Github CI report showing aria-live-capture project's browser tests running faster than JSDOM.
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NodeJS script in VSCode demonstrating how setting "process.title" takes around 10ms.
Replaces test-exclude with micromatch and tinyglobby - test-exclude is 3.6MB and depends on glob and minimatch - vitest already depends on picomatch and tinyglobby so we can get those free in coverage packages
Screenshot of https://vitest.dev/guide/coverage.html#v8-provider contents. Describes the differences between Istanbul and V8 coverage providers.
Storybook's onboarding messages informing Vitest packages installation. The instructions include pun "Let me cover this for you" while installing code coverage packages.
Github commit with title "refactor: switch to tsdown" merged into "tinylibs/tinypool" project.
Bar graph showing results for ast-v8-to-istanbul generating coverage for checker.ts from Typescript repository. - v0.1.0: 1192s - v0.1.1: 35s - v0.1.2: 0.55s
Example test case demonstrating how console logs from passing tests are not visible in terminal when using --silent=passed-only option from Vitest 3.1.0
- Speed of V8 coverage 🏎 - Accuracy of Istanbul coverage 🔍 Experimental AST-aware v8-to-istanbul. Work-in-progress. 🚧 - Unopinionated - bring-your-own AST parser and source maps. - Passes all 195 tests* of istanbul-lib-instrument. ✅ This project tests itself against test cases of istanbul-lib-instrument and verifies coverage maps are 100% identical. Some cases, like deprecated with() statement and edge cases of strict mode are skipped, as all tests are run in strict mode. 100% istanbul compatibility guarantees that coverage reports between V8 and Istanbul can be merged together.
Before-and-after picture of Vitest's verbose reporter tree view fixes. Results on left are rendered as flat list, while right one is rendered as a tree-view.
Bug report with details: - Reproduction: 127.0.0.1:10201 - Steps to reproduce: No response
Vitest usage in State of JS 2024 survey. In 2023 Vitest was ranked #8. In 2024 it was ranked to #4.
Vitest Workspaces with browser mode and JSDOM. Browser mode running in ~320ms, JSDOM in ~500ms.
Git diff showing pkg.pr.new releases in use
Vitest terminal improvements introduced in 2.2.0-beta-2
TutorialKit v1.3.0 with download zip-file button
TutorialKit v1.3.0 file structure variations