1 files changed, 51 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-osfile.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-osfile.js
new file mode 100644
index 0000000000..98fe94e26e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-osfile.js
@@ -0,0 +1,51 @@
+/**
+ * @fileoverview Reject calls into OS.File. We're phasing this out in
+ * favour of IOUtils.
+ *
+ * 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";
+
+const { maybeGetMemberPropertyName } = require("../helpers");
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+function isOSProp(expr, prop) {
+  return (
+    maybeGetMemberPropertyName(expr.object) === "OS" &&
+    isIdentifier(expr.property, prop)
+  );
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url:
+        "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-osfile.html",
+    },
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (isOSProp(node, "File")) {
+          context.report(
+            node,
+            "OS.File is deprecated. You should use IOUtils instead."
+          );
+        } else if (isOSProp(node, "Path")) {
+          context.report(
+            node,
+            "OS.Path is deprecated. You should use PathUtils instead."
+          );
+        }
+      },
+    };
+  },
+};