From 78dff7d232edac689327ad4ff2631f2c86b1186c Mon Sep 17 00:00:00 2001
From: overlookmotel <557937+overlookmotel@users.noreply.github.com>
Date: Tue, 10 Dec 2024 02:28:22 +0000
Subject: [PATCH] feat(semantic): add `SymbolTable::symbol_is_mutated` method
 (#7755)

Add `SymbolTable::symbol_is_mutated` method. Returns `true` if the symbol is not a `const` and has any references with `ReferenceFlags::Write`.
---
 crates/oxc_semantic/src/symbol.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/crates/oxc_semantic/src/symbol.rs b/crates/oxc_semantic/src/symbol.rs
index 5c01b42109d30..e03741eb0988d 100644
--- a/crates/oxc_semantic/src/symbol.rs
+++ b/crates/oxc_semantic/src/symbol.rs
@@ -238,6 +238,18 @@ impl SymbolTable {
             .map(|&reference_id| &self.references[reference_id])
     }
 
+    /// Get whether a symbol is mutated (i.e. assigned to).
+    ///
+    /// If symbol is `const`, always returns `false`.
+    /// Otherwise, returns `true` if the symbol is assigned to somewhere in AST.
+    pub fn symbol_is_mutated(&self, symbol_id: SymbolId) -> bool {
+        if self.flags[symbol_id].contains(SymbolFlags::ConstVariable) {
+            false
+        } else {
+            self.get_resolved_references(symbol_id).any(Reference::is_write)
+        }
+    }
+
     /// Add a reference to a symbol.
     pub fn add_resolved_reference(&mut self, symbol_id: SymbolId, reference_id: ReferenceId) {
         let reference_ids = &mut self.resolved_references[symbol_id];