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npm · #1925 most downloaded on npm
Property based testing framework for JavaScript (like QuickCheck)
Last release 2 days ago
15 Sep 2026
Ships fairly regularly
a new release about every 2 months
Nearly every release is documented
notes for 59 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
9 years old
211 releases · first in 2017
_Basic setup for monorepo_ [Code][Diff]
Basic setup for monorepo [Code][Diff]
yarn workspace * instead of cd packages/*npx by yarn dlx.gitignorefast-check self reference itself as a dev dependencyyarn version checkyarn version for generate changelogyarn version when generating changelogdedupe for each run.yarn/versions with changelogspackages/fast-checkexample/ to examples/test/ into packages/test-bundle-*packages/fast-checkcommandsOne column per quarter.
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(PR#2807) Add ability to wait until the end of a given task from fc.scheduler
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(PR#2391) Automatically shrink user defined examples
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