How to resolve Uncaught ReferenceError: jQuery is not defined(anonymous function) error magento 2?

Many time during custom development in Magento 2 using require js we have faced error like,

Uncaught ReferenceError: jQuery is not defined(anonymous function).
Uncaught TypeError: $(…).customjs is not a function.

Above issue can be resolved using require js paths and shim attribute of requirejs.
Most of the time issue occurs because of jQuery is not loaded before our custom js file due to AMD(asynchronously module dependencies) nature of require js.

Many of the custom js or Third party js library depends on Jquery to load first.
In Magento 2, Magento team used require js concept for improvement of site speed.

So you need to add dependencies in requirejs-config.js file as below. let’s assume you are using slider js names myslider.min.js and they depend on jquery. Your requirejs-config.js file will be as below,

Gives pathname under the paths object, Your myslider.min.js stay at app/code/<Vendor>/<Module>/view/frontend/web/js/myslider.min.js

Gives dependencies using shim attribute. Our slider depends on jquery.

Error during compilation, Incompatible argument type: Required type: \Magento\Framework\DB\Adapter\AdapterInterface.

We can be resolved Compile time error by below way, The error looks like when running compilation command,

Incompatible argument type: Required type: \Magento\Framework\DB\Adapter\AdapterInterface. Actual type: string; File:
Error during compilation


From Magento 2.2.* version we need to pass full class name in__construct()  instead of $connection = null as di argument in Collection.php file.

Replace, $connection = null argument with \Magento\Framework\DB\Adapter\AdapterInterface $connection = null  in __construct() parameter.

Run again command,
php bin/magento setup:di:compile
an error will be gone.

Setup upgrade Error, Invalid Document Element ‘resource’: The attribute ‘title’ is required but missing Magento 2

When we run php bin/magento setup:upgrade command through the command line, Sometimes error will throw like, Invalid Document Element ‘resource’: The attribute ‘title’ is required but missing.

This issue coming to Magento 2.2.* version when you run upgrade command.
This issue is related to acl.xml file. You missing the title attribute to <resource> tag. You must declare all the resource tag in acl.xml file with title attribute except all the resource tag which start with id=”Magento_Backend::”.

Check error code,

<resource id=”Rbj_CustomForm::rbj”> this tag with title attribute is missing, So you must set tag with title=”title name”.

Right code,

Run   Setup upgrade command and your error will be wiped out.