JSLint
warning
Since JetBrains Rider 2020.2, JSLint support in the IDE has been deprecated.
However, JSLint support is still available through the JSLint plugin, which can be installed on the Settings | Plugins page as described in Installing plugins from JetBrains Marketplace.
Note that JSLint does not fully support some latest ECMAScript features. For more information, refer to JSLint official website.