diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f9ba4b..fa601d1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,6 +107,29 @@ jobs:
     - name: nushell completions
       run: nu script/completion-smoke.nu
 
+  test-squint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: "Checkout code"
+      uses: "actions/checkout@v7"
+
+    - name: Prepare java
+      uses: actions/setup-java@v5
+      with:
+        distribution: "zulu"
+        java-version: 21
+
+    - name: Setup Clojure
+      uses: DeLaGuardo/setup-clojure@13.6.1
+      with:
+        bb: 1.12.218
+        cli: latest
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Run tests
+      run: bb squint-test
+
   test-cljd:
     runs-on: ubuntu-latest
 
diff --git a/.gitignore b/.gitignore
index 18fa183..dc3e25a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,5 @@ README.html
 pubspec.lock
 lib/cljd-out
 test/cljd-out
+node_modules
+.squint-out
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45813c1..246021d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ For breaking changes, check [here](#breaking-changes).
 
 ## Unreleased
 
+- Squint support (v0.14.196+)
 - [#166](https://github.com/babashka/cli/issues/166): trigger negation invalid error for `--no-foo` when `:foo`'s specified `:coerce` is not `:boolean`
 ([@lread](https://github.com/lread))
 
diff --git a/bb.edn b/bb.edn
index 7088e3a..44bd279 100644
--- a/bb.edn
+++ b/bb.edn
@@ -20,6 +20,11 @@
   cljs-test {:doc "Run CLJS tests"
              :task (apply clojure "-M:test:cljs-test" *command-line-args*)}
 
+  squint-test {:doc "Run squint tests"
+               :task (do (shell "npm" "install" "--no-save" "--prefix" "." "squint-cljs@latest")
+                         (shell "node_modules/.bin/squint" "compile")
+                         (shell "node" ".squint-out/babashka/run_tests.mjs"))}
+
   cljd-test {:doc "Run ClojureDart tests (requires Dart SDK: https://dart.dev/get-dart)"
              :task (do (shell "dart pub get")
                        (apply clojure "-M:cljd" "test"
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..b7ada42
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,60 @@
+{
+  "name": "cli",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "squint-cljs": "^0.13.195"
+      }
+    },
+    "node_modules/chokidar": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-4.0.3.tgz",
+      "integrity": "sha512-Qgzu8kfBvo+cA4962jnP1KkS6Dop5NS6g7R5LFYJr4b8Ub94PPQXUksCw9PvXoeXPRRddRNC5C1JQUR2SMGtnA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "readdirp": "^4.0.1"
+      },
+      "engines": {
+        "node": ">= 14.16.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/readdirp": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
+      "integrity": "sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14.18.0"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/squint-cljs": {
+      "version": "0.13.195",
+      "resolved": "https://registry.npmjs.org/squint-cljs/-/squint-cljs-0.13.195.tgz",
+      "integrity": "sha512-W8TeNy58jMta0v5SyDwPI58y1IQ9Q3OG3gEZbGa+pqRrmkZEVJ5J4K2OovRJO33tQ5sJVqwjg/lyQcjedL7hvQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/borkdude"
+        }
+      ],
+      "dependencies": {
+        "chokidar": "^4.0.3"
+      },
+      "bin": {
+        "squint": "node_cli.js"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..22d08ff
--- /dev/null
+++ b/package.json
@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "squint-cljs": "^0.13.195"
+  }
+}
diff --git a/squint.edn b/squint.edn
new file mode 100644
index 0000000..d45975a
--- /dev/null
+++ b/squint.edn
@@ -0,0 +1,5 @@
+{:paths ["src" "test"]
+ :deps {io.github.borkdude/deflet {:git/sha "a3c86cdbd23531b2d59e6d7db1c49418cb325c7f"
+                                   :git/tag "v0.1.0"}}
+ :output-dir ".squint-out"
+ :extension "mjs"}
diff --git a/src/babashka/cli.cljc b/src/babashka/cli.cljc
index 0bb84ef..c79e5c0 100644
--- a/src/babashka/cli.cljc
+++ b/src/babashka/cli.cljc
@@ -11,6 +11,9 @@
 
 #?(:clj (set! *warn-on-reflection* true))
 
+;; squint can't tell an injected keyword from a string arg, so wrap injected opts
+#?(:squint (deftype Injected [opt]))
+
 (defn merge-opts
   "Merges babashka CLI options."
   [m & ms]
@@ -242,7 +245,9 @@
              (let [arg-count (count args)
                    cnt (min arg-count
                             (bounded-count arg-count args->opt-keys))]
-               [(concat (interleave args->opt-keys args)
+               [(concat (interleave #?(:squint (map ->Injected args->opt-keys)
+                                       :default args->opt-keys)
+                                    args)
                         (drop cnt args))
                 (drop cnt args->opt-keys)])
              [args args->opt-keys])
@@ -295,7 +300,8 @@
              ::resolved true))))
 
 (defn- kw->str [kw]
-  (subs (str kw) 1))
+  #?(:squint (str kw)
+     :default (subs (str kw) 1)))
 
 (defn- option-label
   "User-facing name for option `opt` in an error message: the literal flag the
@@ -346,7 +352,7 @@
                 (let [coll-coerce? (coll? coerce-k)
                       empty-coll (when coll-coerce? (or (empty coerce-k) []))
                       cf (coerce-coerce-fn coerce-k)
-                      iv (and implicit-values (k implicit-values))]
+                      iv (and implicit-values (get implicit-values k))]
                   (try
                     (cond
                       (and coll-coerce? (coll? v))
@@ -368,7 +374,9 @@
                                            ;; instead of "cannot transform (implicit) true to ..."
                                            :msg (case iv
                                                   true (str "Missing value for option " (option-label km k))
-                                                  false (str "Cannot negate option " (str/replace-first (option-label km k) "no-" ""))
+                                                  ;; NOTE: squint lacks clojure.string/replace-first until > 0.14.196; use JS interop for now
+                                                  false (str "Cannot negate option " #?(:squint (.replace (option-label km k) "no-" "")
+                                                                                        :default (str/replace-first (option-label km k) "no-" "")))
                                                   (str "Invalid value for option " (option-label km k) ": "
                                                        (coerce-failure-reason (:input data) iv (:coerce-fn data))))
                                            :option k
@@ -463,7 +471,7 @@
                       (:pred vf))
                      vf)]
            (when-let [[_ v] (find m k)]
-             (when-not (f v)
+             (when-not (if (set? f) (contains? f v) (f v))
                (let [ex-msg-fn (or (:ex-msg vf)
                                    (fn [{:keys [flag value]}]
                                      (str "Invalid value for option " flag ": " value)))
@@ -567,7 +575,9 @@
               ;; exit loop: no command line args left
               [acc open-opt valued-opt implicit-values opt-parse-order]
               (let [raw-arg (first args)
-                    opt-injected? (keyword? raw-arg)]
+                    opt-injected? #?(:squint (instance? Injected raw-arg)
+                                     :default (keyword? raw-arg))
+                    #?@(:squint [raw-arg (if opt-injected? (.-opt raw-arg) raw-arg)])]
                 (if opt-injected?
                   ;; continue loop: this opt and its value was injected by args->opts
                   ;; opt-val-collector does not apply for injected opts, so is `nil`
@@ -616,7 +626,7 @@
                                     next-arg (first next-args)
                                     next-arg-info (analyze-arg next-arg mode open-opt boolean-opt? valued-opt known-keys alias-keys)
                                     negated-opt? (when-not (contains? known-keys parsed-opt)
-                                                   (str/starts-with? (str parsed-opt) ":no-"))]
+                                                   (str/starts-with? (str parsed-opt) #?(:squint "no-" :default ":no-")))]
                                 (if (or (:hyphen-opt next-arg-info) ;; --open-opt --next
                                         (empty? next-args)          ;; --open-opt
                                         negated-opt?)               ;; --no-foo
@@ -630,7 +640,7 @@
                                              mode (concat expanded next-args) a->o
                                              implicit-values opt-parse-order))
                                     (let [parsed-opt (if negated-opt?
-                                                       (keyword (str/replace (str parsed-opt) ":no-" ""))
+                                                       (keyword (str/replace (str parsed-opt) #?(:squint "no-" :default ":no-") ""))
                                                        parsed-opt)]
                                       ;; continue loop: adding true for --foo or false for --no-foo to args
                                       (recur (stamp (maybe-close-open-opt acc open-opt valued-opt opt-val-collector) parsed-opt literal-opt)
@@ -945,7 +955,7 @@
                      (if desc desc ""))]))
           (if (map? spec)
             (let [order (or order (keys spec))]
-              (map (fn [k] [k (spec k)]) order))
+              (map (fn [k] [k (get spec k)]) order))
             spec))))
 
 (defn- opts->help-rows
@@ -957,7 +967,7 @@
   `format-opts`."
   [{:keys [spec order required]}]
   (let [entries (if (map? spec)
-                  (map (fn [k] [k (spec k)]) (or order (keys spec)))
+                  (map (fn [k] [k (get spec k)]) (or order (keys spec)))
                   spec)
         ;; `:no-doc` options still parse but are hidden from help, like `:no-doc`
         ;; commands are hidden from the command list
@@ -1022,7 +1032,7 @@
           (= k prev) (conj (pop acc) (str "<" (name prev) ">..."))
           :else (recur (next s) (conj acc (str "<" (name k) ">")) k (inc n)))))))
 
-(defn #?(:cljd ^:no-doc cmd-children :default ^:private cmd-children)
+(defn #?(:cljd ^:no-doc cmd-children :squint ^:no-doc cmd-children :default ^:private cmd-children)
   "Visible `[name child]` pairs of `node`'s commands, for display (help,
   completions, error suggestions): `:no-doc` children are dropped. An explicit
   node `:cmd-order` (vector of names) selects which children are shown and in
@@ -1185,8 +1195,8 @@
 (defn- deep-merge [a b]
   (reduce (fn [acc k] (update acc k (fn [v]
                                       (if (map? v)
-                                        (deep-merge v (b k))
-                                        (b k)))))
+                                        (deep-merge v (get b k))
+                                        (get b k)))))
           a (keys b)))
 
 (defn- inherited-entries
@@ -1379,7 +1389,7 @@
     (str/split token #"=" 2)
     [token]))
 
-(defn #?(:cljd ^:no-doc complete-tree* :default ^:private complete-tree*)
+(defn #?(:cljd ^:no-doc complete-tree* :squint ^:no-doc complete-tree* :default ^:private complete-tree*)
   "Returns completion candidate maps (`{:value :description}`) for dispatch tree
   `cmd-tree` and `args` (a vector of tokens, last = the token being completed).
   `global-opts` are the dispatch-level opts, accepted at every level like
diff --git a/test/babashka/cli/completion_test.cljc b/test/babashka/cli/completion_test.cljc
index b717c9c..d02e30e 100644
--- a/test/babashka/cli/completion_test.cljc
+++ b/test/babashka/cli/completion_test.cljc
@@ -5,6 +5,7 @@
    #?(:cljd [cljd.test :refer [deftest is testing]]
       :default [clojure.test :refer [deftest is testing]])
    #?@(:cljd [["dart:io" :as io]]
+       :cljs [["fs" :as fs]]
        :clj [[babashka.fs :as fs]
              [clojure.java.io :as io]])))
 
@@ -16,8 +17,7 @@
 (defn- read-snippet [shell]
   #?(:cljd (.readAsStringSync (io/File. (str "test/resources/completion/completion." shell)))
      :clj (slurp (io/resource (str "resources/completion/completion." shell)))
-     :cljs (.readFileSync (js/require "fs")
-                          (str "test/resources/completion/completion." shell) "utf8")))
+     :cljs (fs/readFileSync (str "test/resources/completion/completion." shell) "utf8")))
 
 ;; clojure.string/split-lines drops trailing empty lines. cljd keeps them
 (defn- lines* [s]
@@ -27,12 +27,12 @@
 
 ;; test helpers over the private completion fns: return the candidate value strings
 (defn complete [table args]
-  (mapv :value (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree table) args)))
+  (mapv :value (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree table) args)))
 (defn complete-options [opts args]
-  (mapv :value (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree [(assoc opts :cmds [])]) args)))
+  (mapv :value (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree [(assoc opts :cmds [])]) args)))
 ;; an unconfigured value position defaults to the shell's file completion
 (defn- files? [table args]
-  (= [{:file-completion true}] (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree table) args)))
+  (= [{:file-completion true}] (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree table) args)))
 (defn- files-options? [opts args]
   (files? [(assoc opts :cmds [])] args))
 
@@ -240,7 +240,7 @@
   (testing "no :complete/:complete-fn/:validate -> the shell's file completion"
     (is (files-options? {:spec {:env {:coerce :string}}} ["--env" ""])))
   (testing ":complete false opts out of the file default"
-    (is (empty? (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*)
+    (is (empty? (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*)
                  (cli/table->tree [{:cmds [] :spec {:msg {:complete false}}}])
                  ["--msg" ""])))))
 
@@ -352,7 +352,7 @@
                             marker)))))
     (testing ":complete false opts a positional out of the file default"
       (let [v [{:cmds ["run"] :args->opts [:name] :spec {:name {:complete false}}}]]
-        (is (not-any? :file-completion (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree v) ["run" ""])))))
+        (is (not-any? :file-completion (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree v) ["run" ""])))))
     (testing "variadic :args->opts does not hang and emits the marker"
       (let [v [{:cmds ["x"] :args->opts (cons :a (repeat :b))}]]
         (is (contains? (set (lines* (complete-via-cmd v {:prog "p"} "p x one two ")))
@@ -400,7 +400,7 @@
       (is (= #{"--force"} (set (complete t ["deploy" "--env=dev" ""])))))
     (testing "no file fallback inside --opt= (shells match files against the whole token)"
       (let [u [{:cmds ["deploy"] :spec {:out {:coerce :string}}}]]
-        (is (empty? (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree u) ["deploy" "--out="])))))
+        (is (empty? (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*) (cli/table->tree u) ["deploy" "--out="])))))
     (testing "bash wordbreak splitting (--opt = val arrives as three tokens)"
       (let [out (fn [& toks]
                   (with-out-str
@@ -446,7 +446,7 @@
       (is (= #{"--opt"} (set (complete t ["sub" "--verbose" "--"]))))))
   (testing "dispatch-level :inherit true"
     (is (= ["--env"]
-           (mapv :value (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*)
+           (mapv :value (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*)
                          (cli/table->tree [{:cmds [] :spec {:env {}}}
                                            {:cmds ["sub"] :fn identity}])
                          ["sub" "--"]
@@ -466,7 +466,7 @@
 (deftest dispatch-level-spec-test
   ;; dispatch-level :spec options parse at every level, so they complete there too
   (is (= #{"--local" "--glob"}
-         (set (mapv :value (#?(:cljd cli/complete-tree* :default #'cli/complete-tree*)
+         (set (mapv :value (#?(:cljd cli/complete-tree* :squint cli/complete-tree* :default #'cli/complete-tree*)
                             (cli/table->tree [{:cmds ["sub"] :fn identity :spec {:local {}}}])
                             ["sub" "--"]
                             {:spec {:glob {}}}))))))
diff --git a/test/babashka/cli_test.cljc b/test/babashka/cli_test.cljc
index 479fd3a..2f0ae0b 100644
--- a/test/babashka/cli_test.cljc
+++ b/test/babashka/cli_test.cljc
@@ -1,7 +1,7 @@
 (ns babashka.cli-test
   (:require
    [babashka.cli :as cli]
-   #?@(:cljd [] :default [[babashka.cli.test-report]])
+   #?@(:cljd [] :squint [] :default [[babashka.cli.test-report]])
    [borkdude.deflet :as d]
    [clojure.string :as str]
    #?(:cljd [cljd.test :refer [deftest is testing]]
@@ -524,13 +524,13 @@
             siblings, in table order"
     (let [tree (cli/table->tree [{:cmds ["a"] :fn identity :doc "A"}
                                  {:cmds [] :cmd {"b" {:fn identity :doc "B"}}}])]
-      (is (= ["a" "b"] (mapv first (#?(:cljd cli/cmd-children :default #'cli/cmd-children) tree))))
+      (is (= ["a" "b"] (mapv first (#?(:cljd cli/cmd-children :squint cli/cmd-children :default #'cli/cmd-children) tree))))
       (is (submap? {:dispatch ["a"]} (cli/dispatch tree ["a"])))
       (is (submap? {:dispatch ["b"]} (cli/dispatch tree ["b"]))))
     (testing "catch-all first: its children list first"
       (let [tree (cli/table->tree [{:cmds [] :cmd {"b" {:fn identity :doc "B"}}}
                                    {:cmds ["a"] :fn identity :doc "A"}])]
-        (is (= ["b" "a"] (mapv first (#?(:cljd cli/cmd-children :default #'cli/cmd-children) tree))))))))
+        (is (= ["b" "a"] (mapv first (#?(:cljd cli/cmd-children :squint cli/cmd-children :default #'cli/cmd-children) tree))))))))
 
 (defn- run-dispatch
   "Run [[cli/dispatch]] capturing stdout+stderr and *exit-fn* calls. Returns
@@ -647,7 +647,7 @@
            (cli/format-command-help {:table {:cmd-order [] :cmd {"a" {:fn identity}}}
                                      :prog "p"}))))
   (testing ":help true does not change command order (sorted tree, >8 children)"
-    (let [tree {:cmd (into (sorted-map)
+    (let [tree {:cmd (into #?(:squint {} :default (sorted-map))
                            (map (fn [i] [(str "c" i) {:fn identity}]))
                            (range 10))}
           expected (mapv #(str "c" %) (range 10))]
@@ -1080,7 +1080,8 @@
                        :cljs :default) e
                (= {:type :org.babashka/cli
                    :cause :validate
-                   :msg "Expected positive number for option :foo but got: 0"
+                   :msg #?(:squint "Expected positive number for option foo but got: 0"
+                           :default "Expected positive number for option :foo but got: 0")
                    :option :foo
                    :flag "--foo"
                    :spec nil
diff --git a/test/babashka/run_tests.cljs b/test/babashka/run_tests.cljs
new file mode 100644
index 0000000..125a9cc
--- /dev/null
+++ b/test/babashka/run_tests.cljs
@@ -0,0 +1,8 @@
+(ns babashka.run-tests
+  (:require [clojure.test :as t]
+            [babashka.cli-test]
+            [babashka.cli.completion-test]))
+(defn -main [& _]
+  (let [{:keys [fail error]} (t/run-tests 'babashka.cli-test 'babashka.cli.completion-test)]
+    (when (pos? (+ (or fail 0) (or error 0))) (js/process.exit 1))))
+(-main)