fix: add hasOwn check before calling reviver (#128)

Rich-Harris · web-flow · commit 2161d4490aa6 · 2025-12-10T20:58:09.000-05:00
diff --git a/.changeset/happy-emus-fry.md b/.changeset/happy-emus-fry.md
@@ -0,0 +1,5 @@
+---
+'devalue': patch
+---
+
+fix: add hasOwn check before calling reviver
diff --git a/src/parse.js b/src/parse.js
@@ -58,7 +58,11 @@ export function unflatten(parsed, revivers) {
 			if (typeof value[0] === 'string') {
 				const type = value[0];
 
-				const reviver = revivers?.[type];
+				const reviver =
+					revivers && Object.hasOwn(revivers, type)
+						? revivers[type]
+						: undefined;
+
 				if (reviver) {
 					let i = value[1];
 					if (typeof i !== 'number') {
diff --git a/tsconfig.json b/tsconfig.json
@@ -10,8 +10,8 @@
 		"diagnostics": true,
 		"noImplicitThis": true,
 		"noEmitOnError": true,
-		"lib": ["es6", "es2020", "dom"],
-		"target": "es2020"
+		"lib": ["es6", "esnext", "dom"],
+		"target": "esnext"
 	},
 	"module": "ES6",
 	"include": ["index.js", "src/*.js"],

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'devalue': patch
 +---
++
 +fix: add hasOwn check before calling reviver