1 files changed, 44 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js
new file mode 100644
index 0000000000..e29a60089c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js
@@ -0,0 +1,44 @@
+/**
+ * @fileoverview Reject calls into Ci.nsIScriptableUnicodeConverter. We're phasing this out in
+ * favour of TextEncoder or TextDecoder.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/rules/reject-scriptableunicodeconverter.html",
+    },
+    messages: {
+      rejectScriptableUnicodeConverter:
+        "Ci.nsIScriptableUnicodeConverter is deprecated. You should use TextEncoder or TextDecoder instead.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (
+          isIdentifier(node.object, "Ci") &&
+          isIdentifier(node.property, "nsIScriptableUnicodeConverter")
+        ) {
+          context.report({
+            node,
+            messageId: "rejectScriptableUnicodeConverter",
+          });
+        }
+      },
+    };
+  },
+};