Following https://jira.greenpeace.org/browse/PLANET-4535 (based on https://jira.greenpeace.org/browse/PLANET-4534),
split/reorganize Media block scripts in assets/src/blocks/{Blockname}  and assets/src/styles/blocks/{Blockname} to this structure :

• assets/src/blocks/{Blockname}/{Blockname}Script.js instantiates a block on the frontend side
• assets/src/blocks/{Blockname}/{Blockname}EditorScript.js instantiates a block editor, in the gutenberg editor
• assets/src/styles/blocks/{Blockname}/{Blockname}Style.scss is used to style the block on frontend
• assets/src/styles/blocks/{Blockname}/{Blockname}EditorStyle.scss is used for editor specific styles

A generic method you can follow is available in this PR https://github.com/greenpeace/planet4-plugin-gutenberg-blocks/pull/591#user-content-genericmethod