Set attribute `maxWidth` for inner blocks of `slug/slider` block depending on block position in the editor. https://florianbrinkmann.com/block-attribute-abhaengig-block-position-11307/

index.js

const {
	select,
} = wp.data;

wp.domReady( () => {
	/**
	 * Get the slider blocks.
	 * 
	 * @param {object} block
	 * @param {array} sliderBlocks 
	 */
	const getSliderBlocks = ( block, sliderBlocks ) => {
		if ( block.innerBlocks.length === 0  ) {
			return;
		}
		
		// Check if it is a slider block. If so, push innerBlocks to the sliderBlocks array.
		if ( block.name === 'slug/slider' ) {
			sliderBlocks.push( block );
			return;
		}

		block.innerBlocks.map( innerBlock => getSliderBlocks( innerBlock, sliderBlocks ) );
	};

	const getBlockList = () => select( 'core/editor' ).getBlocks();
	wp.data.subscribe( () => {
		let blockList = getBlockList();
		if ( blockList ) {
			// Get slider blocks.
			let sliderBlocks = [];
			blockList.map( block => getSliderBlocks( block, sliderBlocks ) );

			sliderBlocks.map( sliderBlock => {
				// Set maxWidth depending on position and settings of block.
				const blockParents = select( 'core/block-editor' ).getBlockParents( sliderBlock.clientId );

				let maxWidth;

				// Check if the slider block has no parents.
				if ( blockParents.length === 0 ) {
					const align = sliderBlock.attributes.align;
					// Set maxWidth to 100vw if full align.
					if ( align !== undefined && align === 'full' ) {
						maxWidth = '100vw';
					}

					// Set maxWidth to 1170 if no align.
					if ( align === undefined || align !== 'full' ) {
						maxWidth = '1170';
					}
				} else {
					// Get column parents.
					const columnParents = select( 'core/block-editor' ).getBlockParentsByBlockName( sliderBlock.clientId, 'core/column' );
					if ( columnParents.length > 0 ) {
						const columnParent = select( 'core/block-editor' ).getBlock( columnParents[0] );

						let columnWidth = columnParent.attributes !== undefined && columnParent.attributes.width !== undefined && columnParent.attributes.width !== '' ? columnParent.attributes.width : 50;
						maxWidth = 1170 / 100 * columnWidth;
					} else {
						maxWidth = '1170';
					}
				}

				// Set the attributes for the slide blocks.
				sliderBlock.innerBlocks.map( slideBlock => {
					slideBlock.attributes.maxWidth = maxWidth;
				} );
			} );
		}
	} );
} );