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How do I programmatically add fields to Paragraph types?

I have one paragraph type of Product. and I have to add one field to paragraph product programmatically, how can I achive this.

function my_module_field_widget_paragraphs_form_alter(&$element, FormStateInterface &$form_state, $context){   if ($element['#paragraph_type'] == 'products') {     Drupal::logger('my_module')->info('debug');  <!-- add field here -->    } }

and other answer I found is

use DrupalparagraphsEntityParagraph;    $paragraph = Paragraph::load($paragraph_id);   $paragraph->field_image[] = [     'target_id' => $fid,     'alt' => $alt,     'title' => $title,   ];   $paragraph->save();

But in which function or preprocess I need to add above code?

This article was republished from its original source.
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How do I programmatically add fields to Paragraph types?

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