three.js/examples/js/lines/Line2.js

console.warn( "THREE.Line2: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/index.html#manual/en/introduction/Import-via-modules." );
/**
 * @author WestLangley / http://github.com/WestLangley
 *
 */

THREE.Line2 = function ( geometry, material ) {

	THREE.LineSegments2.call( this );

	this.type = 'Line2';

	this.geometry = geometry !== undefined ? geometry : new THREE.LineGeometry();
	this.material = material !== undefined ? material : new THREE.LineMaterial( { color: Math.random() * 0xffffff } );

};

THREE.Line2.prototype = Object.assign( Object.create( THREE.LineSegments2.prototype ), {

	constructor: THREE.Line2,

	isLine2: true

} );