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Changelog

For a list of breaking changes, check here.

Clj-kondo: static analyzer and linter for Clojure code that sparks joy ✨

2023.05.26

#2083: fix regression with :missing-test-assertion introduced in 2023.05.18
#2084: add :refers to :refer-all finding
#2086: false positive missing test assertion with swap!
#2087: honor :config-in-comment for :unused-referred-var

2023.05.18

Linter :uninitialized-var moved from default :level :off to :warning
#2065: new linter :equals-true: suggest using (true? x) over (= true x) (defaults to :level :off).
#2066: new linters :plus-one and :minus-one: suggest using (inc x) over (+ x 1) (and similarly for dec and -, defaults to :level :off)
#2051: consider :unresolved-namespace :exclude as already required namespaces
#2056: validate collection nodes when constructing and --debug is true
#2058: warn about #() and #"" in .edn files
#2064: False positive when using :sha instead of :git/sha in combination with git url in deps.edn
#2063: introduce new :defined-by->lint-as key which contains the :lint-as value for "defining" var, whereas :defined-as now always contains the name of the original "defining var". This is a BREAKING change.
#1983: produce java-member-definition analysis for .java files.
#2068: include :or default in :local-usages analysis
#2079: analysis for data_readers.clj
#2067: support :ns-groups to be used with :analyze-call and :macroexpand hooks
#1918: ignore keyword bindings with namespaced in :keyword-binding linter
#2073: :lint-as clj-kondo.lint-as/def-catch-all should ignore unresolved namespaces
#2078: detect more :missing-test-assertion cases, e.g. (deftest foo (not (= 1 2)))

2023.04.14

#1196: show language context in .cljc files with :output {:langs true}. See docs.
#2026: coercing string did not create StringNode, but TokenNode, lead to false positive Too many arguments to def
#2030: Add a new :discouraged-tag linter for discouraged tag literals. See the docs.
Add :gen support on clojure.spec.alpha/keys
#1647: support :exclude-patterns in :unresolved-symbol linter
#2036: False positive :def-fn on def + reify
#2024: CLJS allows interop in constructor position
#2025: support namespace groups with :unresolved-namespace linter
#2039: :analysis :symbols + :aliased-namespace-symbol linter gives false positive in quoted symbol
#2043: support ignore annotation on private calls
Support :exclude-pattern in :unused-binding
#2046: clj-kondo stuck in loop with multiple :or in destructuring
#2048: better linting in schema.core/defn with invalid s-exprs

2023.03.17

#2010: Support inline macro configuration. See docs
#2010: Short syntax to disable linters: {:ignore [:unresolved-symbol]} or {:ignore true}, valid in ns-metadata, :config-in-ns, :config-in-call
#2009: new :var-same-name-except-case linter: warn when vars have names that differ only in case (important for AOT compilation and case-insensitive filesystems) (@emlyn).
#1269: warn on :jvm-opts in top level of deps.edn
#2003: detect invalid arity call for function passed to update, update-in, swap!, swap-vals!, send, send-off, and send-via (@jakemcc).
#1983: add support for java member analysis, via new java-member-definitions bucket (@ericdallo).
#1999: add hooks-api/set-node and hooks-api/set-node? (@sritchie).
#1997: False positive on clojure.core/aget with more than two args
#2011: push images to GHCR (@lispyclouds)
#2001: false positive :misplaced-docstring in clojure.test/deftest

2023.02.17

#1976: warn about using multiple bindings after varargs (&) symbol in fn syntax
Add arity checks for core def
#1954: new :uninitialized-var linter. See docs.
#1996: expose hooks-api/resolve. See docs.
#1971: false positive :redundant-fn-wrapper with syntax-quoted body
#1984: lint java constructor calls as unresolved-symbol when using dot notation.
#1970: :dynamic-var-not-earmuffed should be opt-in
#1972: type hint aliases should not result in unresolved symbol
#1951: include end locations in :line-length linter
#1987: Fix escaping of regex literal string in :macroexpand
#1980: make support for ignoring warnings in generated hooks explicit
#1979: allow :level :off in :discouraged-var config on var level
#1995: clj-kondo.lint-as/def-catch-all doesn't emit locations, fixes navigation for lsp
#1978: false positive type error with symbol argument + varargs
#1989: don't analyze location metadata coming from :macroexpand hook (performance optimization)

2023.01.20

#1956: enable printing to *err* in hooks
#1943: allow :discouraged-namespace to be suppressed with #_:clj-kondo/ignore
#1942: prioritize specific namespace over ns-groups for :discouraged-namespace linter
#1959: analyze custom defn properly
#1961: be lenient with unexpected type
#1945: support merging of multiple ns-group configs
#1962: don't emit warning for aliased namespace var usage in syntax-quote
#1952: add :exclude-urls and :exclude-pattern

2023.01.16

#1920: new linter :def-fn: warn when using fn inside def, or fn inside let inside def (@andreyorst).
#1949: :aliased-namespace-var-usage gives erroneous output for keywords
Add test for #1944 (already worked)
Don't reload SCI namespace on every hook usage

2023.01.12

#1742: new linter :aliased-namespace-var-usage: warn on var usage from namespaces that were used with :as-alias. See demo.
#1914: Don't warn about single arg use when there's a second arg in a reader conditional (@mk)
#1912: Allow forward references in comment forms (@mk). See demo.
#1926: Add keyword analysis for edn files.
#1922: don't crash on invalid type specification
#1902: provide :symbols analysis for navigation to symbols in quoted forms or EDN files. See demo.
#1939: no longer warn on unused namespace that was only used with :as-alias
#1911: missing test assertion linter doesn't work in CLJS
#1891: support CLJ_KONDO_EXTRA_CONFIG_DIR environment variable to enable extra linters after project config

2022.12.10

#1909: lower requirement on glibc in dynamic linux binary to 2.31 by using fixed version of CircleCI image

2022.12.08

#609: typecheck var usage, e.g. (def x :foo) (inc x) will now give a warning
#1867: add name metadata to class usage
#1875: add :duplicate-field-name linter for deftype and defrecord definitions.
#1883: constructor usage should have name-col in analysis
#1874: fix name of fully qualified class usage
#1876: suppress . analysis from .. macroexpansion
#1877: suppress new analysis from (String. x) expansion
#1888: use namespace-munge for resolving hook files rather than munge
#1896: don't consider **, *** etc. to be a dynamic vars
#1899: treat var or local reference as unused value when not in tail position
#1903: int can be cast to double
#1871: clj-kondo marks args in definterface as unused
#1879: analyze definterface more similarly to defprotocol for lsp-navigation
#1907: add hooks-api/generated-node? function to check if a node was generated
#1887, use re-find for ns groups rather than re-matches

2022.11.02

#1846: new linters: :earmuffed-var-not-dynamic and :dynamic-var-not-earmuffed. See docs.
#1842: Add :exclude option to :used-underscored-binding (@staifa)
#1840: Fix warning in .cljs and .cljc for :aliased-namespace-symbol in interop calls. (@NoahTheDuke)
#1845: add :derived-location to analysis when location is derived from parent node
#1853: fix :level :off not being respected in :discouraged-var configs that are merged in.
#1855: accept symbol in addition to keyword in clojure.spec.alpha/def name position
#1844: support extra schema in schema.core/defrecord
#1720: prevent parse error on defmulti without args
#1863: Added clj-kondo-docker pre-commit hook.

2022.10.14

#1831: Add :redundant-fn-wrapper support for keyword and binding calls (@NoahTheDuke)
#1830: Fix warning on :include-macros in .cljs and .cljc for :unknown-require-option linter. (@NoahTheDuke)
#1238: Build a linux/aarch64 executable in CI (cap10morgan)
Add :exclude option to :unknown-require-option
Enable :unused-value by default
Publish .sha256 files along with released artifacts

2022.10.05

#611: New linter: :unused-value - see docs. Also see issue #1258.
#1794: New linter: :line-length - see docs (@ourkwest)
#1460: New linter: :unknown-require-option - see docs. (@NoahTheDuke)
#1800: New linter: :aliased-namespace-symbol - see docs. (@NoahTheDuke)
#1758: Overrides don't get applied to var-definitions during analysis (@sheluchin)
#1807: False positive with map transducer in cljs
#1806: False positive recur mismatch with letfn
#1810: Fix printing error map as additional error (@NoahTheDuke)
#1812: Inconsistent handling of location metadata sometimes produces nil values (@sheluchin)
#1805: Ignore hints not being considered on protocol vars
#1819: Fix "Too many open files" in java class definition analysis caused by files not being closed (@rsauex)
#1821: Include vectors in :unused-binding config :exclude-destructured-as flag. (@NoahTheDuke)
#1818: unresolved var when using interop on var in CLJS
#1817: improve warning with invalid require libspec (@benjamin-asdf)
#1801: Missing docstring fix for deftype in CLJS
Bump GraalVM to 22.2.0 for native-image
Bump SCI to 0.4.33

2022.09.08

:config-in-call - see docs
#1127: :config-in-tag - see docs
#1791: Fix issue with namespace-name-mismatch on namespaces with + sign (and others)
#1782: Fix issue with jar URI missreporting to file-analyzed-fn, bump babashka/fs to 0.1.11
#1780: Can not use NPM dependency namespaces beginning with "@" in consistent-linter alias
#1771: don't crash on empty ns clauses: (require '[]) and (import '())
#1774: Add support for sourcehut inferred git dep urls for the Clojure CLI
#1768: Expose a tag function in clj-kondo.hooks-api
#1790: Add support for :filename-pattern in :ns-group
#1773: false positive type mismatch warning with hook
#1779: lazy-seq should be coerced a list node
#1764: store overrides in cache and don't run them at runtime

2022.08.03

#1755: Fix false positive invalid-arity when using mapcat transducer in sequence with multiple collections
#1749: expose clojure.pprint/pprint to the hooks API
#698: output rule name with new output option :show-rule-name-in-message true. See example in config guide.
#1735 Add support for nilable map type specs
#1744 Expose :imported-ns in analysis of vars imported by potemkin
#1746 Printing deps.edn error to stdout
#1716 Include dispatch-val in analysis of defmethod
#1760 Add :arglist-strs support for functions defined with fn
#1731: prioritize special form in name resolving
#1739: Namespaced map type check fix
Fix #1737: config-in-ns for specific namespace + ns-group override
Fix #1741: Ignore redundant-call when single call is made in .cljc

2022.06.22

#1721: new :discouraged-namespace linter. See docs.
#1728 New macOS aarch64 (M1-compatible) binary
#1726: fix invalid arity warning for sequence with map multi-arity transducer
#1715: fix false positive warning for recur not in tail position with core.async alt!!
#1714: fix recur arity for defrecord, deftype and definterface
#1718: make unsorted namespaces linter case-insensitive
#1722: suppress redundant do in .cljc for just one language

2022.05.31

Ensure every node has a location when returning from :macroexpand

2022.05.29

Support :instance-invocations analysis bucket
Copy .clj_kondo files from configs

2022.05.28

Fix false positive redundant do's from :macroexpand hooks (regression in 2022.05.27)

2022.05.27

#686: new :warn-on-reflection linter. See docs.
#1692: new linter :redundant-call - warns when a function or macro call with 1 given argument returns the argument. See docs.
All new JVM clj-kondo.hooks-api API ns for REPL usage. See docs.
#1674: config options to limit analysis of var-usages and bodies of var-definitions. Can be used to get a quick overview of a project's namespaces and vars, without analyzing their details.
#1676: Add support for custom function to be called for progress update, :file-analyzed-fn.
#1697: update docs and messaging around importing configs (@lread)
#1700: allow discouraged var on non-analyzed (closed source) vars
#1703: update built-in cache with newest CLJ (1.11.1) and CLJS (1.11.54) versions
#1704: fix re-frame analysis bug
#1705: add pre-commit utility support via .pre-commit-hooks.yaml
#1701: preserve locations in seqs and symbols in :macroexpand hook
#1685: Support .clj_kondo hook extension
#1670: parse error on auto-resolved keyword for current ns
#1672: support clojure.test/deftest-
#1678: support with-precision

2022.04.25

#1669: fix re-frame analysis problem causing file to be not parsed

2022.04.23

#1653: new linter :keyword-binding - warns when a keyword is used in a :keys binding vector. This linter is :off by default. See docs.
#996: new linter :discouraged-var. See docs.
#1618: new :config-in-ns configuration option. See docs.
Support :ns-groups configuration option. See docs
#1657: support bindings with same name in clojure.core.match
#1659: fix false positive unused import
#1649: dot (.) should be unresolved when not in fn position

2022.04.08

#1331: new linter :non-arg-vec-return-type-hint that warns when a return type hint is not placed on the arg vector (CLJ only). See docs.
Enable :namespace-name-mismatch by default
#1611: support ^:replace override for nested config values
#1625: Add option --skip-lint, to skip linting while still executing other tasks like copying configuration with --copy-configs.
#1620: return type too narrow for re-find

Analysis:

#1623: Implement analysis for Java classes: :java-class-definitions and :java-class-usages. See docs.
#1635: add :end-row and end-col to analyze data for :namespace-definitions
#1651: Improvements for :protocol-impls
#1612: Improve analysis for deftype
#1613: Improve analysis for reify
#1609: keyword analysis for ns + require

2022.03.09

#1607: disable :namespace-name-mismatch until further notice due to problems on Windows
#1570: add :defmethod true to defmethod var-usages analysis.

2022.03.08

New

#1602: analysis data now includes :protocol-ns and :protocol-name on protocol methods (@lread)

Fixed

#1605: error while determining namespace mismatch on Windows

2022.03.04

New

#1240: Add linter :namespace-name-mismatch to detect when namespace name does not match file name. (@svdo)

Fixed

#1598: :scope-end-row is missing on multi-arity fn args (@mainej)
#1588: analyze type hint in reified method
#1581: redundant fn wrapper false positive when using pre-post-map
#1582: False positive Insufficient input when using symbol call
#1579: relax linting in tagged literal forms
#1578: allow :deprecated-var config in ns form metadata
#892: suppress unresolved namespaces in data readers config
#1594: lint clojure.test.check.properties/for-all as let

2022.02.09

New

#1549: detect and warn on cyclic task dependencies in bb.edn (@mknoszlig)
#1547: catch undefined tasks present in :depends. (@mknoszlig)
#783: :keys can be used in :ret position, also fixes types return map call as input for another typed map function. (@pfeodrippe)
#1526: detect redundant fn wrappers, like #(inc %). See docs. This linter of :off by default but may be enabled by default in future versions after more testing.
#1560: lint task definition keys in bb.edn (@mknoszlig)
#1484: Add analysis information about protocol implementations. (@ericdallo)

Fixed

#1563: vector inside list should not be linted as function call when inside tagged literal.
#1540: imported class flagged as unused when it only appears in annotation metadata.
#1571: ignore spliced reader conditionals wrt. namespace sorting.
#1574: def usage context contains reference of the re-frame reg-sub it is used in. (@benedekfazekas)

2022.01.15

Fix #1537: stackoverflow with potemkin import vars with cyclic references
Fix #1545: recur in cond-> gives warning about recur not in tail position.
Fix #1535: support CLJS vars / protocols references via dot rather than slash.

2022.01.13

Add linter :conflicting-fn-arity: warn when an arity occurs more than once in a function that overloads on arity. #1136 (@mknoszlig)
Add linter :clj-kondo-config which provides linting for .clj-kondo/config.edn. #1527
Relax :reduce-without-init for functions known to be safe #1519
Symbol arg to fdef can be arbitrary namespace #1532
Improve potemkin generated var-definition analysis #1521 (@ericdallo)
Stabilize cache version independent from kondo version #1520. This allows you to re-use the cache over multiple kondo versions.
:output {:progress true} should print to stderr #1523
Only print informative messages when --debug is enabled. #1514
Add Sublime Text instructions #827 (@KyleErhabor)
Fix end location in anonyous function body #1533
Bump datalog-parser to 0.1.9: allows symbol constants in datalog expression

2021.12.19

New

Add linter :reduce-without-init: warn against two argument version of reduce. Disabled by default. See docs. #1064 (@mknoszlig)
Add linter :quoted-case-test-constant: warn on quoted test constants in case. #1496 (@mknoszlig)

Enhanced

Fix false positive unused binding in re-frame subscribe #1504
Fix exclude-defmulti-args for CLJS #1503
Fix warning location of namespaced map #1475
False positive :docstring-no-summary on multiline docstrings #1507

2021.12.16

New

Automatically load configurations from .clj-kondo/*/*/config.edn. This can be disabled with :auto-load-configs false. #1492
Add linter :duplicate-case-test-constant: detect duplicate case test constants. See docs. #587 (@mknoszlig)
Add linter :unexpected-recur: warn on recur in unexpected (non-tail) position. #1126
Add linter :used-underscored-binding: warn on used bindings that start with underscore. Disabled by default. See docs. #1149 (@mknoszlig)
Add linter :docstring-blank for checking empty docstring. See docs. #805 (@joodie)
Add linter :docstring-leading-trailing-whitespace for checking leading and trailing whitespace in docstring. Disabled by default. See docs. #805 (@joodie)
Add linter :docstring-no-summary for checking the absence of summary of args in docstring. Disabled by default. See docs. #805 (@joodie)
Add :exclude-defmulti-args option for :unused-bindings linter. See docs. #1188 (@mknoszlig)
Support :config-in-comment #1473. See docs.

Enhanced

Bump built-in cache for clojure 1.11.0-alpha3 and clojure.data.json
Reword :refer suggestion so you can copy paste it #1293 (@vemv)
Add re-frame analysis output #1465 (@benedekfazekas)
Qualified map causes too many arguments in type checker #1474
Handle reader conditional with unknown language #970

2021.12.01

Improve linting in extend-protocol, extend-type, reify, specify! #1333, #1447
Support :context in nodes in hooks for adding context to analysis #1211
goog.object, goog.string etc must be required before use in newer releases of CLJS #1422
Resume linting after invalid keyword #1451
Fix install script for relative dir opts #1444
Fix type mismatch error with auto-qualified keyword #1467
String type hint causes false error report #1455
Fix false positive with cljs/specify! #1450
Improve analysis for ns-modifying destructuring key #1441
CLJS (exists? foo.bar/az) complains about require #1472

2021.10.19

New

New optional linter: warn on missing gen-class if namespace has -main fn #1417. See docs.
Detect arity mismatches for functions defined with def #1408
Type inference improvements for def + fn combination #1410
Local fn type inference #1412
Analysis: allow user to request all or specific metadata be returned #1280 (@lread)
rseq called on other type than vector or sorted-map now gives type error #1432

Enhanced / fixed

Fix false positive with ns-unmap #1393
Support custom-lint-fn with .cljc #1403
Allow reader conditional in metadata #1414
Analysis: add :from-var in higher order call #1404
Dedupe linted files #1395 (@ericdallo)
Add :duplicate-ns to duplicate-require linter output #1421 (@ericdallo)
if-let / if-some with invalid arity no longer warn #1426
Analysis: spport for defn 2nd attr-map, :doc derivation fixes (@lread)
Fix parsing of trailing metdata map #1433 (@lread)

2021.09.25

Update built-in cache to clojure 1.11.0-alpha2 #1382
Take into account aliases in import-vars #1385
Consider var as used in CLJS case to avoid false positives for constants #1388
Understand ns-unmap pattern #1384
Expose config functions in core API namespace #1389
Fix false positives when using quoted collection in function position #1390

Analysis

Add :end-row, :end-col to :var-usages analysis element #1387
BREAKING: Change :row and :col for :var-usages to use the start location of the call instead of the name location #1387

2021.09.15

Support :as-alias (new feature in Clojure 1.11) #1378
Improve :loop-without-recuir wrt/ fn and other constructs that introduce a recur target #1376

2021.09.14

Add :loop-without-recur linter. #426
Lint deps.edn and bb.edn :paths #1353 (@lread)
Fix unresolved-symbol for all-lowercase class name #1362
Add :refer to var-usages when inside a require #1364 (@ericdallo)
musl fix #1365 (@thiagokokada)
Fix incorrectly reported filename #1366
Self-referring private-var should be reported unused if not used elsewhere #1367
Support options map in babashka.process/$ #1368
Analyze metadata map of defmulti #1310
Add support for potemkin full qualified symbols #1371 (@ericdallo)

2021.08.06

Expose ns-analysis fn in hooks API #1349 (@hugoduncan)
Fix for Windows when analyzing deps

2021.08.03

Enhanced / fixed

Fix conflicts between application code and hook config code in cache #1340
Allow overriding level in reg-finding! #1344 (@ericdallo)
Fix declare name positions in analysis #1343 (@ericdallo)
Updated rules for deps.edn to match Clojure CLI 1.10.1.933 (@dpassen)

2021.07.28

New

:macroexpand hook. This allows linting using the same or similar macros from your code. See docs.

Enhanced / fixed

Add types for ex-info #1314
Bump SCI to v0.2.6
Fix EDN/JSON serialization of findings for NPM string namespace #1319
Support fully qualified symbol in def referring to current namespace #1326
Fix false positive redundant expression in pre-post map #1335

2021.06.18

New

Lint arities of fn arguments to higher order functions (map, filter, reduce, etc.) #1297
Add map-node and map-node? to hooks API #1270

Enhanced / fixed

Disable redefined-var warning in comment #1294
:skip-comments false doesn't override :skip-comments true in namespace config #1295
False positive duplicate element set for symbols/classes #1296

v2021.06.01

False positive unused namespace with clojure.spec/keys #1289

v2021.05.31

New

Lint clojure.spec.alpha/keys #1272 (@daveduthie)
Macroexpand clojure.template/do-template #603
Proper macroexpansion for clojure.test/are #1284
Resolve vars in clojure.data.xml imported via macro #1274
Lint ([]) as invalid call to vector #1276

Enhanced / fixed

Improve keyword reg support for re-frame #1159 (@ericdallo)
Refine messaging around importing configs #1256 (@lread)
Static linux binary is now compiled with musl
Recognize :doc from attr-map in defn #1265
Don't skip linting .jar files with --dependencies when config(s) have changed #1285

2021.04.23

New

--fail-level flag to specify the minimum severity for a non-zero exit code #1259 (@RickMoynihan)

Enhanced / fixed

Support core.async defblockingop macro #1244
Add error message when keywords are passed in :or map #1242
False positive unused default when analyzing locals #1246
False positive when destructuring depends on previous arg #782
Keyword analysis for namespaced maps #1251 (@ericdallo)
Report reader errors at the start of token #1255 (@yuhan0)
Fix recur arity for lazy-seq and lazy-cat (@yuhan0)
Prioritize aliases over object access in CLJS #1248 (@jahson)

2021.03.31

Enhanced / fixed

:defined-by contains raw node for sgen fns #1231
Fix wrong order of unresolved symbols #1237
Remove generated nodes from analysis #1239 (@ericdallo)
Add :report-duplicates linter config for several linters. #1232 (@snoe)

2021.03.22

New

--copy-configs flag to indicate copy configs from dependencies while linting. This replaces --no-warnings.
--dependencies flag to indicate skipping already linted jars for performance. This replaces --no-warnings.

Enhanced / fixed

Support js property access syntax #1189
Fix linting user.clj #1190
Add linting for sgen/lazy-prims #1192
NullPointerException when ignoring :deprecated-var #1195
Fix :lint-as with cond-> #1205
Expose config to hook fns #1208 (@not-in-stock)
Fix crash with :clj-kondo/ignore in combination with :rename #1210
Fix false positive unresolved symbol in CLJS type hint #1212
Fix invalid namespace in clojure.data.xml analysis #1202
Fix analysis of clojure.core.reducers/defcurried #1217
Add :defined-by on missing var definitions #1219 (@ericdallo)
Add name positions to local-usage analysis #1220 (@ericdallo)
False positive :unused-private-var warning for deftype ^:private #1222
Correct escaping for docstrings in analysis #1224 (@lread)

2021.03.03

Enhanced / fixed

Redundant expression false positive #1183
Redundant expression false positive #1185
Regression in unresolved symbol config #1187

2021.02.28

New

Lint nested function literal #636
Redundant expression linter #298
Add :exclude config to :refer linter #1172
Warn on non-existent var in :refer #546
Support clojure.data.xml/alias-uri#1180

Enhanced / fixed

Fix schema.core/defmethod linting for vectors dispatch-values #1175 (@leoiacovini)
Continue analyzing on invalid symbol #1146
Standalone require should be emitted to analysis #1177
Upgrade sci to 0.2.4

2021.02.13

Thanks to @snoe and @ericdallo for contributing to this release. Thanks to the sponsors on Github, OpenCollective and Clojurists Together for making this release possible.

New

Core.match support #496
Keyword analysis #1129 (@snoe). See analysis docs.

Enhanced / fixed

BREAKING: Don't use lint-as for hooks #1170
Fix crash when linting kitchen-async #1148
Memory optimizations for clojure-lsp commit
Upgrade to GraalVM 21.0.0 #1163
Fix analysis of case dispatch vals #1169
Potemkin improvement with regards to unresolved var #1167
Exported config fix for git deps #1171
Add :aliases to ns ctx and :alias to var-usages #1133 (@snoe)
Add :end-row and :end-col to var-definitions bucket on analysis #1147 (@ericdallo)
Fix unresolved var clojure.spec.gen.alpha/fmap #1157

2021.01.20

Thanks to @SevereOverfl0w, @jysandy, @tomdl89, @snoe, @audriu, and @ericdallo for contributing to this release.

New

New linter: :unresolved-var. This detects unresolved vars in other namespaces, like set/onion. See docs. #635
Alpine Docker build #1111
Add locals to analysis #1109 (@snoe)
Add analysis for arglists #1123 (@snoe)

Enhanced / fixed

Fix finding without location info #1101
Detect duplicate key in '{[1 2] 3, (1 2) 4} #1056 (@jysandy)
Add cljs.core cases in lint-specific-calls! #1116 (@tomdl89)
[#1099] Add :single-operand-logical linter for and and or #1122 (@tomdl89)
Add :ns to :unused-namespace findings (@ericdallo)
Derive config dir from only file path linted #1135
Support name in defmethod fn-tail #1115
Avoid crash when using :refer-clojure + :only #957

v2020.12.12

New

Documentation: a list of all available linters #936
Lint protocol and interface implementations in deftype and defrecord #140
Upgrade to GraalVM 20.3.0 #1085
Support cljs.core/simple-benchmark syntax #1079
Support babashka.process/$ macro syntax #1089

Enhanced / fixed

Fix recur arity in doysync #1081
Alias linter doesn't recognize (quote alias) form #1074
Fix retries for refer :all when linting in parallel #1068
Improve analyzing syntax of amap #1069
Namespaced map in deps.edn causes false positive #1093
Support ignore hints in deps.edn #1094
Fix unsorted namespaces linter for nested libspecs #1097
Fix reported ns name in analysis for nested libspecs #1100

v2020.11.07

Thanks @bennyandresen, @jaihindhreddy, @mharju, @pepijn, @slipset and @nvuillam for contributing to this release. Thanks to Clojurists Together for sponsoring this release.

New

Lint deps.edn #945
--filename option to set filename when linting from stdin. This should be used for editor plugins to enable deps.edn linting.
Export and import config via classpath #559, clj-kondo/config#1
--no-warnings flag to indicate linting is used to populate cache.
Skip already linted jars #705
Implement :include option for shadowed-var linter #1040
Return :files count in summary #1046

Enhanced

Better resolving of vars referred with :all #1010
Fix false positive with format #1044
Fix index out of bounds exception clj-kondo.lsp#11
More robust marking of generated nodes to avoid redundant dos and lets despite location metadata #1059

v2020.10.10

Thanks @zilti, @dharrigan and @sogaiu for contributing to this release. Thanks to Clojurists Together for sponsoring this release.

New

Shadowed var linter #646. See docs.
Config for ignoring unused :as binding clj-kondo#1016 (@dharrigan)
Type warning for contains? #1021
Predicate functions for hooks api #1006. See docs.
Support reader conditionals in ignore hint #1022. See docs.
Support ignore hint on unused binding #1017
Support ignore hint in ns form #1031
Linux packages (@zilti)

Fixed / enhanced

Fix memory leak in long running process #1036
Claypoole config enhancements clj-kondo/config#7
Don't warn about redundant let and do in hook-generated code #1038
Fix format string false positive #1007
Parse failure in (or) #1023
Analyze require in top-level do #1018
Analyze quote in require #1019
Base Docker image on Ubuntu latest #1026

Thanks to @cldwalker, @bfontaine, @snoe, @andreyorst, @jeroenvandijk, @jaihindhreddy, @sittim and @sogaiu for contributing to this release. Thanks to the people who helped designing the new features in Github issue conversations. Thanks to Clojurists Together for sponsoring this release.

New

Add --parallel option to lint sources in parallel. This will speed up linting an entire classpath. #632, #972

Detect error when calling a local that's not a function. #948

(let [inc "foo"]
  (inc 1))
  ^--- String cannot be called as a function

Support ignore hints #872:

(inc 1 2 3)
^--- clojure.core/inc is called with 3 args but expects 1

#_:clj-kondo/ignore
(inc 1 2 3)
^--- arity warning ignored

#_{:clj-kondo/ignore[:invalid-arity]}
(do (inc 1 2 3))
^--- only redundant do is reported, but invalid arity is ignored

Also see config.md.

Merge config from $HOME/.config/clj-kondo, respecting XDG_CONFIG_HOME. See config.md for details. #992
New :config-paths option in <project>/.clj-kondo/config.edn. This allows extra configuration directories to be merged in. See config.md for details. #992
Config tool that can spit out library specific configurations that can be added via :config-paths. Contributions for libraries are welcome.
Experimental spec inspection tool that attempts to extract type information for linting. Also uses the new :config-paths feature.
Allow pinned version in installation script #946 (@cldwalker)

Fixed

Fix docstring in Rum defc hook #960
Format string checking improvements #942, #949
False positive with into and transducer #952
Alias usage not detected in keywords when in quoted form #981
Fully qualified class name incorrectly assumed to be var #950
Backup existing clj-kondo binary when installing #963 (@bfontaine)
Various documentation fixes and improvements (@jeroenvandijk, @sittim, @sogaiu)

Misc

Update to GraalVM 20.2.0 for native-image build @jaihindhreddy

Prior to v2020.09.09

Details about releases prior to v2020.09.09 can be found here.

Breaking changes

Unreleased

#2063: introduce new :defined-by->lint-as key which contains the :lint-as value for "defining" var, whereas :defined-as now always contains the name of the original "defining var". This is a BREAKING change.

2021.09.25

Change :row and :col for :var-usages to use the start location of the call instead of the name location #1387

2020.10.10

Base Docker image on Ubuntu latest instead of Alpine #1026
Don't use lint-as for hooks #1170

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