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

import InputNode from '../core/InputNode.js';
import UVNode from '../accessors/UVNode.js';

class TextureNode extends InputNode {

	constructor( value, uv = new UVNode() ) {

		super( 'texture' );

		this.value = value;
		this.uv = uv;

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

	}

	generate( builder, output ) {

		const type = this.getType( builder );

		const textureProperty = super.generate( builder, type );
		const uvSnippet = this.uv.build( builder, 'vec2' );

		const textureCallSnippet = builder.getTexture( textureProperty, uvSnippet );

		return builder.format( textureCallSnippet, type, output );

	}

}

export default TextureNode;