three.js/src/core/InstancedInterleavedBuffer.js

import { InterleavedBuffer } from './InterleavedBuffer.js';

/**
 * @author benaadams / https://twitter.com/ben_a_adams
 */

function InstancedInterleavedBuffer( array, stride, meshPerAttribute ) {

	InterleavedBuffer.call( this, array, stride );

	this.meshPerAttribute = meshPerAttribute || 1;

}

InstancedInterleavedBuffer.prototype = Object.assign( Object.create( InterleavedBuffer.prototype ), {

	constructor: InstancedInterleavedBuffer,

	isInstancedInterleavedBuffer: true,

	copy: function ( source ) {

		InterleavedBuffer.prototype.copy.call( this, source );

		this.meshPerAttribute = source.meshPerAttribute;

		return this;

	}

} );

export { InstancedInterleavedBuffer };