1 files changed, 57 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js
new file mode 100644
index 0000000000..0289ae941d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js
@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Reject `add_task(async function setup` or similar patterns in
+ * favour of add_setup.
+ *
+ * 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 isNamedLikeSetup(name) {
+  return /^(init|setup)$/i.test(name);
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-addtask-setup.html",
+    },
+    fixable: "code",
+    messages: {
+      useAddSetup: "Do not use add_task() for setup, use add_setup() instead.",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+  create(context) {
+    return {
+      "Program > ExpressionStatement > CallExpression": function (node) {
+        let callee = node.callee;
+        if (callee.type === "Identifier" && callee.name === "add_task") {
+          let arg = node.arguments[0];
+          if (
+            arg.type !== "FunctionExpression" ||
+            !arg.id ||
+            !isNamedLikeSetup(arg.id.name)
+          ) {
+            return;
+          }
+          context.report({
+            node,
+            messageId: "useAddSetup",
+            fix: fixer => {
+              let range = [node.callee.range[0], arg.id.range[1]];
+              let asyncOrNot = arg.async ? "async " : "";
+              return fixer.replaceTextRange(
+                range,
+                `add_setup(${asyncOrNot}function`
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};