From cd6a2b976aa5aa7ff3491e6266b49e2b049d2a6a Mon Sep 17 00:00:00 2001
From: Ed Rivas <ed@oddbird.net>
Date: Sat, 8 Jul 2023 00:38:21 +0000
Subject: [PATCH] Enforce operator validation

---
 lib/src/value/calculations.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/src/value/calculations.ts b/lib/src/value/calculations.ts
index 8babbec9..6343ab86 100644
--- a/lib/src/value/calculations.ts
+++ b/lib/src/value/calculations.ts
@@ -111,7 +111,8 @@ export class SassCalculation extends Value {
   }
 }
 
-export type CalculationOperator = '+' | '-' | '*' | '/';
+const operators = ['+', '-', '*', '/'] as const;
+export type CalculationOperator = typeof operators[number];
 
 export class CalculationOperation implements ValueObject {
   readonly operator: CalculationOperator;
@@ -123,6 +124,9 @@ export class CalculationOperation implements ValueObject {
     left: CalculationValue,
     right: CalculationValue
   ) {
+    if (!operators.includes(operator)) {
+      throw new Error(`Unknown operator ${operator}`);
+    }
     this.operator = operator;
     this.left = left;
     this.right = right;