feat(ast): compute max value that can be mapped to AstType

Cameron McHenry · Cameron McHenry · commit ea30a17a47df · 2025-07-11T13:19:46.000-04:00
diff --git a/crates/oxc_ast/src/generated/ast_kind.rs b/crates/oxc_ast/src/generated/ast_kind.rs
@@ -203,6 +203,9 @@ pub enum AstType {
     JSDocUnknownType = 186,
 }
 
+/// The largest integer value that can be mapped to an `AstType`/`AstKind` enum variant.
+pub const AST_TYPE_MAX: u16 = 187;
+
 /// Untyped AST Node Kind
 #[derive(Debug, Clone, Copy)]
 #[repr(C, u8)]
diff --git a/tasks/ast_tools/src/generators/ast_kind.rs b/tasks/ast_tools/src/generators/ast_kind.rs
@@ -132,6 +132,8 @@ impl Generator for AstKindGenerator {
             next_index += 1;
         }
 
+        let ast_type_max = number_lit(next_index);
+
         let output = quote! {
             #![expect(missing_docs)] ///@ FIXME (in ast_tools/src/generators/ast_kind.rs)
 
@@ -152,6 +154,10 @@ impl Generator for AstKindGenerator {
                 #type_variants
             }
 
+            ///@@line_break
+            /// The largest integer value that can be mapped to an `AstType`/`AstKind` enum variant.
+            pub const AST_TYPE_MAX: u16 = #ast_type_max;
+
             ///@@line_break
             /// Untyped AST Node Kind
             #[derive(Debug, Clone, Copy)]

Original file line number	Diff line number	Diff line change
`@@ -203,6 +203,9 @@ pub enum AstType {`
`203`	`203`	`JSDocUnknownType = 186,`
`204`	`204`	`}`
`205`	`205`
	`206`	+/// The largest integer value that can be mapped to an `AstType`/`AstKind` enum variant.
	`207`	`+pub const AST_TYPE_MAX: u16 = 187;`
	`208`	`+`
`206`	`209`	`/// Untyped AST Node Kind`
`207`	`210`	`#[derive(Debug, Clone, Copy)]`
`208`	`211`	`#[repr(C, u8)]`