A demo app implementing custom charts using ECharts, Satori and Next.js route handler

1. Setup Next.js.
2. Install packages echarts and echarts-for-react.
3. Create a component for Echarts that accepts an chartOptions prop.
4. Setup the Echart in the page route.

1. Create a route handler at api/chart/route.ts that returns an SVG string of the chart.
2. Implement a Download component that performs a POST request using the chartOptions.
3. Convert the SVG string to either an SVG URI or PNG URI based on the use case.

1. Setup Satori:

• Install package satori and intl-segmenter-polyfill.
• Extend the global window interface with __resource typings.d.ts.
• Add the font file using by satori to the public directory.

2. Creaye a reactToSVG function that converts a React component to an SVG string satori
3. Add a React Template to customize the chart ChartTemplate.
4. Pass the template to Satori using reactToSVG to generate an SVG string of the customized chart.
5. Convert the SVG string to a data URI and download it.

1. Instead of returning an SVG string from route handler, you can return a data URI directly so that we can skip one function call.