Sandbox::https://github.com/wwwaker/function-plot/blob/master/src/datum-defaults.ts

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import type { FunctionPlotDatum } from './types.js'

import { randomId } from './utils.mjs'

export default function datumDefaults(d: FunctionPlotDatum): FunctionPlotDatum {

if (!('id' in d)) {

d.id = randomId()

}

// default graphType uses boxes i.e. 2d intervals

if (!('graphType' in d)) {

d.graphType = 'interval'

}

// if the graphType is not `interval` then the sampler is `builtIn`

// because the interval sampler returns a box instead of a point

if (!('sampler' in d)) {

d.sampler = d.graphType !== 'interval' ? 'builtIn' : 'interval'

}

if (!('fnType' in d) && (d.graphType == 'polyline' || d.graphType == 'interval' || d.graphType == 'scatter')) {

d.fnType = 'linear'

}

return d

}