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Note: Using configuration file /builds/issue/signature_field-3533081/web/modules/custom/signature_field-3533081/phpstan.neon.

Line src/Plugin/Field/Element/Signature.php

13 Class Drupal\signature_field\Element\Signature extends deprecated
class Drupal\Core\Render\Element\FormElement:
in drupal:10.3.0 and is removed from drupal:12.0.0. use
\Drupal\Core\Render\Element\FormElementBase instead.
55 Call to deprecated method renderPlain() of class
Drupal\Core\Render\Renderer:
in drupal:10.3.0 and is removed from drupal:12.0.0. Use
\Drupal\Core\Render\RendererInterface::renderInIsolation() instead.

Line src/Plugin/Field/FieldWidget/SignatureWidget.php

254 Call to deprecated method renderPlain() of interface
Drupal\Core\Render\RendererInterface:
in drupal:10.3.0 and is removed from drupal:12.0.0. Use
\Drupal\Core\Render\RendererInterface::renderInIsolation() instead.
259 Call to deprecated method renderPlain() of interface
Drupal\Core\Render\RendererInterface:
in drupal:10.3.0 and is removed from drupal:12.0.0. Use
\Drupal\Core\Render\RendererInterface::renderInIsolation() instead.

1. Class Inheritance Deprecation

File:Signature.php
Line:13

Problem:
Your class extends `FormElement`, which is deprecated.
Solution:
Change the parent class from `FormElement` to `FormElementBase`.

How to fix:

// ...existing code...
use Drupal\Core\Render\Element\FormElementBase;
// ...existing code...
class Signature extends FormElementBase {
// ...existing code...
````

---

2. Deprecated Method: `renderPlain()`

Files:
- Signature.php (Line 55)
- SignatureWidget.php (Lines 254, 259)

Problem:
`renderPlain()` is deprecated.
Solution:
Use `renderInIsolation()` instead.

How to fix:

// ...existing code...
// $output = $renderer->renderPlain($build);
$output = $renderer->renderInIsolation($build);
// ...existing code...
````

// ...existing code...
// $output = $this->renderer->renderPlain($build);
$output = $this->renderer->renderInIsolation($build);
// ...existing code...
````

Summary:
- Change `FormElement` to `FormElementBase`.
- Replace all `renderPlain()` calls with `renderInIsolation()`.