three.js/examples/jsm/nodes/core/VarNode.js

import Node, { addNodeClass } from './Node.js';
import { addNodeElement, nodeProxy } from '../shadernode/ShaderNode.js';

class VarNode extends Node {

	constructor( node, name = null ) {

		super();

		this.node = node;
		this.name = name;

	}

	isGlobal() {

		return true;

	}

	getHash( builder ) {

		return this.name || super.getHash( builder );

	}

	getNodeType( builder ) {

		return this.node.getNodeType( builder );

	}

	generate( builder ) {

		const { node, name } = this;

		const nodeVar = builder.getVarFromNode( this, name, builder.getVectorType( this.getNodeType( builder ) ) );

		const propertyName = builder.getPropertyName( nodeVar );

		const snippet = node.build( builder, nodeVar.type );

		builder.addLineFlowCode( `${propertyName} = ${snippet}` );

		return propertyName;

	}

}

export default VarNode;

export const temp = nodeProxy( VarNode );

addNodeElement( 'temp', temp );

addNodeClass( 'VarNode', VarNode );