From 1de742a71d78282dfb83382ac208657b31437113 Mon Sep 17 00:00:00 2001
From: greymoth-jp <m.hirakawa07@icloud.com>
Date: Mon, 29 Jun 2026 19:00:28 +0900
Subject: [PATCH] fix(id): escape values assigned through the value setter

ID had no value setter, so a programmatically assigned id value was
emitted verbatim instead of escaped. ClassName has escaped assigned
values since 2018; mirror the same setter on ID.
---
 src/__tests__/id.mjs |  9 +++++++++
 src/selectors/id.js  | 20 ++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/__tests__/id.mjs b/src/__tests__/id.mjs
index b7216d6..054f0a8 100644
--- a/src/__tests__/id.mjs
+++ b/src/__tests__/id.mjs
@@ -5,6 +5,15 @@ test("id selector", "#one", (t, tree) => {
   t.deepEqual(tree.nodes[0].nodes[0].type, "id");
 });
 
+test("ID#set value", "#fo\\o", (t, selectors) => {
+  let id = selectors.first.first;
+  t.deepEqual(id.raws, { value: "fo\\o" });
+  id.value = "bar";
+  t.deepEqual(id.raws, {});
+  id.value = "foo.bar";
+  t.deepEqual(id.raws, { value: "foo\\.bar" });
+});
+
 test("id selector with universal", "*#z98y ", (t, tree) => {
   t.deepEqual(tree.nodes[0].nodes[0].value, "*");
   t.deepEqual(tree.nodes[0].nodes[0].type, "universal");
diff --git a/src/selectors/id.js b/src/selectors/id.js
index 9f11abb..8d69552 100644
--- a/src/selectors/id.js
+++ b/src/selectors/id.js
@@ -1,3 +1,5 @@
+import cssesc from "cssesc";
+import { ensureObject } from "../util";
 import Node from "./node";
 import { ID as IDType } from "./types";
 
@@ -5,6 +7,24 @@ export default class ID extends Node {
   constructor(opts) {
     super(opts);
     this.type = IDType;
+    this._constructed = true;
+  }
+
+  set value(v) {
+    if (this._constructed) {
+      let escaped = cssesc(v, { isIdentifier: true });
+      if (escaped !== v) {
+        ensureObject(this, "raws");
+        this.raws.value = escaped;
+      } else if (this.raws) {
+        delete this.raws.value;
+      }
+    }
+    this._value = v;
+  }
+
+  get value() {
+    return this._value;
   }
 
   valueToString() {