three.js/src/nodes/accessors/Arrays.js

import StorageInstancedBufferAttribute from '../../renderers/common/StorageInstancedBufferAttribute.js';
import StorageBufferAttribute from '../../renderers/common/StorageBufferAttribute.js';
import { storage } from './StorageBufferNode.js';
import { getLengthFromType, getTypedArrayFromType } from '../core/NodeUtils.js';

/**
 * TSL function for creating a storage buffer node with a configured `StorageBufferAttribute`.
 *
 * @tsl
 * @function
 * @param {Number|TypedArray} count - The data count. It is also valid to pass a typed array as an argument.
 * @param {String|Struct} [type='float'] - The data type.
 * @returns {StorageBufferNode}
 */
export const attributeArray = ( count, type = 'float' ) => {

	let itemSize, typedArray;

	if ( type.isStruct === true ) {

		itemSize = type.layout.getLength();
		typedArray = getTypedArrayFromType( 'float' );

	} else {

		itemSize = getLengthFromType( type );
		typedArray = getTypedArrayFromType( type );

	}

	const buffer = new StorageBufferAttribute( count, itemSize, typedArray );
	const node = storage( buffer, type, count );

	return node;

};

/**
 * TSL function for creating a storage buffer node with a configured `StorageInstancedBufferAttribute`.
 *
 * @tsl
 * @function
 * @param {Number|TypedArray} count - The data count. It is also valid to pass a typed array as an argument.
 * @param {String|Struct} [type='float'] - The data type.
 * @returns {StorageBufferNode}
 */
export const instancedArray = ( count, type = 'float' ) => {

	let itemSize, typedArray;

	if ( type.isStruct === true ) {

		itemSize = type.layout.getLength();
		typedArray = getTypedArrayFromType( 'float' );

	} else {

		itemSize = getLengthFromType( type );
		typedArray = getTypedArrayFromType( type );

	}

	const buffer = new StorageInstancedBufferAttribute( count, itemSize, typedArray );
	const node = storage( buffer, type, count );

	return node;

};