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Using latest heatmap.js with Canvas in a jest test leads to errors. It fails with:
TypeError: offset required
43 | function createHeatmap(parent: HTMLElement, heatData: HeatData[]) {
44 | return heatmap
> 45 | .create({
| ^
46 | container: parent
47 | })
48 | .setData({
at _getColorPalette (../../node_modules/heatmap.js/build/heatmap.js:262:16)
at new Canvas2dRenderer (../../node_modules/heatmap.js/build/heatmap.js:355:21)
at new Heatmap (../../node_modules/heatmap.js/build/heatmap.js:650:24)
at Object.create (../../node_modules/heatmap.js/build/heatmap.js:715:12)
at createHeatmap (src/SVGHeatmap.tsx:45:6)
at src/SVGHeatmap.tsx:81:21
at commitHookEffectList (../../node_modules/react-dom/cjs/react-dom.development.js:22030:26)
at commitPassiveHookEffects (../../node_modules/react-dom/cjs/react-dom.development.js:22064:11)
at HTMLUnknownElement.callCallback (../../node_modules/react-dom/cjs/react-dom.development.js:336:14)
at innerInvokeEventListeners (../../node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:316:27)
This is the line that throws the error:
https://github.com/pa7/heatmap.js/blob/master/src/renderer/canvas2d.js#L14
The reason is explained here:
https://stackoverflow.com/questions/62332852/how-to-create-gradient-text-in-canvas-nodejs
And you can see that in the node js canvas there's indeed a type check:
Solution is simple parse the string to number.
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