Fix all issues for the case when tree-sitter is disabled.

* lisp/treesit.el (treesit-declare-unavailable-functions):
Declare 'treesit-language-abi-version' and 'treesit-library-abi-version'.

* lisp/progmodes/elixir-ts-mode.el (elixir-ts--range-rules):
* lisp/progmodes/heex-ts-mode.el (heex-ts--range-rules):
* lisp/progmodes/rust-ts-mode.el (treesit-language-source-alist):
Guard with 'treesit-available-p'.

lisp/progmodes/elixir-ts-mode.el

@@ -622,12 +622,13 @@
   "`treesit-thing-settings' for Elixir.")
 
 (defvar elixir-ts--range-rules
-  (treesit-range-rules
-   :embed 'heex
-   :host 'elixir
-   '((sigil (sigil_name) @_name
-            (:match "^[HF]$" @_name)
-            (quoted_content) @heex))))
+  (when (treesit-available-p)
+    (treesit-range-rules
+     :embed 'heex
+     :host 'elixir
+     '((sigil (sigil_name) @_name
+              (:match "^[HF]$" @_name)
+              (quoted_content) @heex)))))
 
 (defvar heex-ts--range-rules)
 (defvar heex-ts--thing-settings)

lisp/progmodes/heex-ts-mode.el

@@ -173,18 +173,19 @@ Return nil if NODE is not a defun node or doesn't have a name."
   "`treesit-thing-settings' for HEEx.")
 
 (defvar heex-ts--range-rules
-  (treesit-range-rules
-   :embed 'elixir
-   :host 'heex
-   '((directive [(partial_expression_value)
-                 (ending_expression_value)]
-                @cap))
+  (when (treesit-available-p)
+    (treesit-range-rules
+     :embed 'elixir
+     :host 'heex
+     '((directive [(partial_expression_value)
+                   (ending_expression_value)]
+                  @cap))
 
-   :embed 'elixir
-   :host 'heex
-   :local t
-   '((directive (expression_value) @cap)
-     (expression (expression_value) @cap))))
+     :embed 'elixir
+     :host 'heex
+     :local t
+     '((directive (expression_value) @cap)
+       (expression (expression_value) @cap)))))
 
 (defvar elixir-ts--font-lock-settings)
 (defvar elixir-ts--font-lock-feature-list)

lisp/progmodes/rust-ts-mode.el

@@ -44,7 +44,8 @@
 (add-to-list
  'treesit-language-source-alist
  `(rust "https://github.com/tree-sitter/tree-sitter-rust"
-        ,(if (< (treesit-library-abi-version) 15) "v0.23.2" "v0.24.0"))
+        ,(when (treesit-available-p)
+           (if (< (treesit-library-abi-version) 15) "v0.23.2" "v0.24.0")))
  t)
 
 (defcustom rust-ts-mode-indent-offset 4

lisp/treesit.el

@@ -70,6 +70,9 @@ in a Emacs not built with tree-sitter library."
      (declare-function treesit-language-available-p "treesit.c")
      (declare-function treesit-language-version "treesit.c")
 
+     (declare-function treesit-language-abi-version "treesit.c")
+     (declare-function treesit-library-abi-version "treesit.c")
+
      (declare-function treesit-parser-p "treesit.c")
      (declare-function treesit-node-p "treesit.c")
      (declare-function treesit-compiled-query-p "treesit.c")