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Create a stream graph from CSV data


This is probably more a question around D3, rather than Observable - so if it’s off-topic, please feel free to close it.

In essence, in https://beta.observablehq.com/@cfax/stream-graph I’m trying to build a stream graph, from a very simple CSV file.

What is not entirely clear to me, is how I can manipulate the tabular data into a data structure that could be used to plot the graph - I feel I might not be doing the right thing and I’m overcomplicating the code.

For instance, I’m not entirely sure how to craft the area function to return the first column of the CSV (namely “buildNumber”) - is my attempt correct?