Add required array element constraints

editors/tree-sitter-decodal/grammar.js

@@ -54,6 +54,7 @@ module.exports = grammar({
       $.regex_literal,
       $.comparison_constraint,
       $.object,
+      $.array_constraint,
       $.array,
       $.let_expression,
       $.function_expression,
@@ -116,6 +117,14 @@ module.exports = grammar({
       ']',
     ),
 
+    array_constraint: $ => seq(
+      '[',
+      '...',
+      field('element', $._expression),
+      optional(','),
+      ']',
+    ),
+
     let_expression: $ => seq(
       'let',
       repeat(seq($.field_definition, ';')),