Fix clj-kondo#1786: support gen-interface (clj-kondo#2418)

* Add test

* Fix clj-kondo#1786: support gen-interface

CHANGELOG.md

@@ -22,6 +22,7 @@ For a list of breaking changes, check [here](#breaking-changes).
 - [#1784](https://github.com/clj-kondo/clj-kondo/issues/1784): detect `:redundant-do` in `catch`
 - [#2410](https://github.com/clj-kondo/clj-kondo/issues/2410): add `--report-level` flag
 - [#2416](https://github.com/clj-kondo/clj-kondo/issues/2416): detect empty `require` and `:require` forms ([@NoahTheDuke](https://github.com/NoahTheDuke))
+- [#1786](https://github.com/clj-kondo/clj-kondo/issues/1786): Support `gen-interface` (by suppressing unresolved symbols)
 
 ## 2024.09.27
 

src/clj_kondo/impl/analyzer.clj

@@ -2062,6 +2062,12 @@
   (swap! (:namespaces ctx) assoc-in [base-lang lang current-ns :gen-class] true)
   nil)
 
+(defn analyze-gen-interface [ctx expr]
+  ;; for now we just ignore the form to not cause false positives
+  ;; we can add more sophisticated linting, e.g. causing -init to be used
+  (let [ctx (utils/ctx-with-linter-disabled ctx :unresolved-symbol)]
+    (analyze-children ctx expr)))
+
 (defn analyze-extend-type-children
   "Used for analyzing children of extend-protocol, extend-type, reify and specify! "
   [ctx children defined-by defined-by->lint-as]
@@ -2484,6 +2490,7 @@
                           (analyze-hof ctx expr resolved-as-name resolved-namespace resolved-name)
                           (ns-unmap) (analyze-ns-unmap ctx base-lang lang ns-name expr)
                           (gen-class) (analyze-gen-class ctx expr base-lang lang ns-name)
+                          (gen-interface) (analyze-gen-interface ctx expr)
                           (exists?) (analyze-cljs-exists? ctx expr)
                           (with-precision) (analyze-with-precision ctx expr children)
                           (var) (analyze-var ctx expr children)

test/clj_kondo/main_test.clj

@@ -1969,7 +1969,12 @@ foo/foo ;; this does use the private var
                      {:linters {:unresolved-symbol {:level :error}}}
                      "--lang" "cljs")))
   (is (empty? (lint! "(def Vec 1)"
-                     {:linters {:redefined-var {:level :error}}}))))
+                     {:linters {:redefined-var {:level :error}}})))
+  (is (empty? (lint! "(ns a.b.c)
+(gen-interface
+ :name a.b.c.Foo
+ :methods [[bar [String] Object]])"
+                     {:linters {:unresolved-symbol {:level :error}}}))))
 
 (deftest tagged-literal-test
   (is (empty?