flowChildNode( node, output = null ) {

		const previousFlow = this.flow;

		const flow = {
			code: ''
		};

		this.flow = flow;

		flow.result = node.build( this, output );

		this.flow = previousFlow;

		return flow;

	}
Generates a code flow based on a child Node.

@param {Node} node - The node to execute.
@param {?string} output - Expected output type. For example 'vec3'.
@return {Object} The code flow.