Magento 2.3 example of where proxy is used but not explicitly requested in constructors

Question

I'm trying to find an example in M2 repo where a proxy is used but not explicitly requested in a constructor. Can anyone point me in the right direction?

This is in response to phpcs Magento2 ruleset error

Proxies and interceptors MUST never be explicitly requested in constructors.

Answer 1

Proxies are injected via di.xml.

<type name="Your\Class">
    <arguments>
        <argument name="slowLoading" xsi:type="object">SlowLoading\Class\Proxy</argument>
    </arguments>
</type>

Mostly used them in console commands for now. Generally you can use them everywhere you want to delay the instantiation of a class with all its own dependencies until it is directly called upon.

Magento DevDocs

Answer 2

Here's what an actual working example looks like

https://github.com/justbetter/magento2-sentry/blob/26daa9575a8e9f673aa6102558288ae46a436a60/Plugin/MonologPlugin.php

Before

    /**
     * {@inheritdoc}
     */
    public function __construct(
        $name,
        Data\Proxy $data,
        SentryLog\Proxy $sentryLog,
        DeploymentConfig\Proxy $deploymentConfig,
        array $handlers = [],
        array $processors = []
    ) {
        $this->sentryHelper = $data;
        $this->sentryLog = $sentryLog;
        $this->deploymentConfig = $deploymentConfig;
        parent::__construct($name, $handlers, $processors);
    }

After

use JustBetter\Sentry\Model\SentryLog;

    /**
     * {@inheritdoc}
     */
    public function __construct(
        $name,
        Data $data,
        SentryLog $sentryLog,
        DeploymentConfig $deploymentConfig,
        array $handlers = [],
        array $processors = []
    ) {
        $this->sentryHelper = $data;
        $this->sentryLog = $sentryLog;
        $this->deploymentConfig = $deploymentConfig;
        parent::__construct($name, $handlers, $processors);
    }

etc/di.xml

https://github.com/justbetter/magento2-sentry/blob/8d7adcce685ae1fba38187901dee894002d05c78/etc/di.xml#L14-L23

 <type name="JustBetter\Sentry\Plugin\MonologPlugin">
        <arguments>
            <argument name="name" xsi:type="string"></argument>
            <argument name="data" xsi:type="object">JustBetter\Sentry\Helper\Data\Proxy</argument>
            <argument name="sentryLog" xsi:type="object">JustBetter\Sentry\Model\SentryLog\Proxy</argument>
            <argument name="deploymentConfig" xsi:type="object">Magento\Framework\App\DeploymentConfig\Proxy</argument>
            <argument name="handlers" xsi:type="array"></argument>
            <argument name="processors" xsi:type="array"></argument>
        </arguments>
    </type>