WordPress at a glance
filter is not described

write_your_story filter-hook . WP 5.0.0

Filters the body placeholder text.

Usage

add_filter( 'write_your_story', 'filter_function_name_6430', 10, 2 );
function filter_function_name_6430( $text, $post ){
	// filter...

	return $text;
}
$text(string)
Placeholder text.
Default: 'Start writing or type / to choose a block'
$post(WP_Post)
Post object.

Where the hook is called

In file: /wp-admin/edit-form-blocks.php
write_your_story
wp-admin/edit-form-blocks.php 267
$body_placeholder = apply_filters( 'write_your_story', __( 'Start writing or type / to choose a block' ), $post );

Where the hook is used (in WP core)

Does not used.