three.js/examples/jsm/renderers/nodes/inputs/Matrix3Node.js

import InputNode from '../core/InputNode.js';
import { Matrix3 } from '../../../../../build/three.module.js';

class Matrix3Node extends InputNode {

	constructor( value = new Matrix3() ) {

		super( 'mat3' );

		this.value = value;

		Object.defineProperty( this, 'isMatrix3Node', { value: true } );

	}

}

export default Matrix3Node;