generate( builder, output ) {

		const { outputNode } = builder.getNodeProperties( this );

		if ( outputNode && outputNode.isNode === true ) {

			return outputNode.build( builder, output );

		}

	}
Represents the generate stage which is the third step of the build process, see {@link Node#build} method.
This state builds the output node and returns the resulting shader string.

@param {NodeBuilder} builder - The current node builder.
@param {?string} output - Can be used to define the output type.
@return {?string} The generated shader string.