Don't automatically remove old files with emit!

Instead provide a `clean!` function that takes care of cleaning files
from the current and old configuration locations.

Author: mattiuusitalo

CHANGELOG.md

@@ -17,6 +17,7 @@ Malli is in well matured [alpha](README.md#alpha).
 ## UNRELEASED
 
 * `malli.clj-kondo/emit!` saves to `.clj-kondo/imports` now as recommended by clj-kondo. [#1216](https://github.com/metosin/malli/pull/1216)
+* `malli.clj-kondo/emit!` no longer deletes anything automatically. Use `malli.clj-kondo/clean!` to clean up.
 
 ## 0.19.1 (2025-06-09)
 * Technical release

README.md

@@ -3300,6 +3300,15 @@ Emitting config into `./.clj-kondo/imports/metosin/malli-types-clj/config.edn`:
 (mc/emit!)
 ```
 
+Removing the generated configurations. Note that this removes also
+from locations where old versions of malli used to store the
+configuration file:
+
+<!-- :test-doc-blocks/skip -->
+```clojure
+(mc/clean!)
+```
+
 In action:
 
 ![malli](docs/img/clj-kondo.png)

src/malli/clj_kondo.cljc

@@ -187,7 +187,6 @@
       (save! config key nil))
      ([config key options]
       (let [cfg-file (-config-file-path key options)]
-        (clean! key options)
         (io/make-parents cfg-file)
         (spit cfg-file (with-out-str (fipp/pprint config {:width 120})))
         config))))