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

import Node from './Node.js';

class CodeNode extends Node {

	constructor( code = '', nodeType = 'code' ) {

		super( nodeType );

		this.code = code;

		this._includes = [];

	}

	setIncludes( includes ) {

		this._includes = includes;

		return this;

	}

	getIncludes( /*builder*/ ) {

		return this._includes;

	}

	generate( builder ) {

		const includes = this.getIncludes( builder );

		for ( const include of includes ) {

			include.build( builder );

		}

		const nodeCode = builder.getCodeFromNode( this, this.getNodeType( builder ) );
		nodeCode.code = this.code;

		return nodeCode.code;

	}

}

CodeNode.prototype.isCodeNode = true;

export default CodeNode;