My code is like: ``` const fs = require('fs'); const output = require('d3node-output'); const d3 = require('d3-node')().d3; const d3nPie = require('d3node-piechart'); const csvString = fs.readFileSync('./data.csv').toString(); const data = d3.csvParse(csvString); const options = {width: 200, height: 200}; output('./export', d3nPie({ data: data }), options); ``` After I run the above code, these files are generated: export.html and export.svg, but not export.png. How can I generate png as well? Thanks!
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