cozy defaults
Toasty by default
Sensible rules right out of the bag. No config wrangling — just unzip, light the fire, and start linting.
Flint:A fast, friendly linterfor JavaScript, TypeScript, and more.
Flint is an experimental new "hybrid" linter that combines the performance of modern dev tooling with best-in-class comprehensive developer experience.
🏕️ Get started in 10 seconds
Try Flint on any project
Pick your favorite fire-starter:
npx flintbunx flintdeno x flintpnpx flintyarn dlx flintFrustrated with slow linting that doesn't catch what you care about? Or maybe your linter is fast, but doesn't lint everything you think it should? Give Flint a shot.
Get started →🌲 What's in the pack
Everything you need to guide you
Flint learns from years of web tooling to be your new North Star for lovely linting.
fast & cached
Always points home
Intelligent caching and CI coordination keep duplicate jobs from wandering off-trail. Your runs finish faster.
typed power
Type-checked shelter
Lint rules powered by the full TypeScript type checker. They catch the kind of bugs that hide under tent flaps.
clear config
Bright, readable config
Configs you can actually read by lantern-light. Powerful when you need it, quiet when you don't.
📖 The trail map
Hundreds of rules, hand-picked & happy.
Each rule comes with a friendly explanation, real-world examples, and an autofix when we can manage it. No cryptic codes. No lecture from the scout-master.
- anyAssignments
Reports assigning a value with type
tslogicalanyto variables and properties. - unnecessaryComparisons
Reports comparisons that are always true, always false, or can be simplified.
tslogical - deprecated
Disallow using code marked as @deprecated.
tslogical - caseFallthroughs
Reports switch case clauses that fall through unexpectedly.
tslogical - arrayIncludes
Reports using
tsstylistic.indexOf()comparisons that can be replaced with.includes(). - unnecessaryTernaries
Reports ternary expressions that can be simplified to boolean expressions or logical operators
tsstylistic
Gather 'round, friend.
Flint is built in the open by a tiny crew who really, really like cool code and warm drinks. Come hang out.
❤️🔥
Thank you to our sponsors
Flint can't happen without the generous support of these wonderful folks.
Financial sponsors allow us to keep development of Flint going, including maintaining and improving the project, providing support to users, and pushing web ecosystem tooling forward with advances in great typed static analysis and holistically designed linting.