1 files changed, 21 insertions, 0 deletions
diff --git a/docs/code-quality/lint/linters/eslint-plugin-mozilla/use-includes-instead-of-indexOf.rst b/docs/code-quality/lint/linters/eslint-plugin-mozilla/use-includes-instead-of-indexOf.rst
new file mode 100644
index 0000000000..bb65ebea2c
--- /dev/null
+++ b/docs/code-quality/lint/linters/eslint-plugin-mozilla/use-includes-instead-of-indexOf.rst
@@ -0,0 +1,21 @@
+use-includes-instead-of-indexOf
+===============================
+
+Use ``.includes`` instead of ``.indexOf`` to check if something is in an array
+or string.
+
+Examples of incorrect code for this rule:
+-----------------------------------------
+
+.. code-block:: js
+
+    let a = foo.indexOf(bar) >= 0;
+    let a = foo.indexOf(bar) == -1;
+
+Examples of correct code for this rule:
+---------------------------------------
+
+.. code-block:: js
+
+    let a = foo.includes(bar);
+    let a = foo.indexOf(bar) > 0;