1 files changed, 25 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sysmjs.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sysmjs.js
new file mode 100644
index 0000000000..03fe80e5c4
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+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sysmjs.js
@@ -0,0 +1,25 @@
+/**
+ * @fileoverview Defines the environment for sys module files.
+ *
+ * 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";
+
+module.exports = {
+  globals: {
+    // These globals are hard-coded and available in .sys.mjs scopes.
+    // https://searchfox.org/mozilla-central/rev/dcb0cfb66e4ed3b9c7fbef1e80572426ff5f3c3a/js/xpconnect/loader/mozJSModuleLoader.cpp#222-223
+    // Although `debug` is allowed for jsm files, this is non-standard and something
+    // we don't want to allow in mjs files. Hence it is not included here.
+    atob: false,
+    btoa: false,
+    dump: false,
+    // The WebAssembly global is available in most (if not all) contexts where
+    // JS can run. It's definitely available in system modules. So even if this
+    // is not the perfect place to add it, it's not wrong, and we can move it later.
+    WebAssembly: false,
+  },
+};