Bring back the uPlot typescript namespace

Hey @leeoniya 👋 Since this commit from v1.4.0, all the types/interfaces related to uPlot are no longer in a namespace:

Before

import uPlot from 'uplot'

const axisStyles: uPlot.Axis = {
    font: `500 12px ${htmlStyles.fontFamily}`,
    stroke: htmlStyles.color,
    grid: { stroke: 'rgba(0,0,0, 0.05)' },
    ticks: { show: false }
}

const plot = new uPlot()

After

 // Loss of information about where the Axis type comes from.
import uPlot from 'uplot'
import type { Axis } from 'uplot'

const axisStyles: Axis = {
}

const plot = new uPlot()

or

// Having to import uplot twice.
import uPlot from 'uplot'
import type * as uPlotTypes from 'uplot'

const axisStyles: uPlotTypes.Axis = {
}

const plot = new uPlot()

or

// This is the closest to where we had before, but having to access the
// `default` export for the constructor is not good.
import * as uPlot from 'uplot'

const axisStyles: uPlot.Axis = {
}

const plot = new uPlot.default()

With a namespace that is named the same as the uPlot class like it was before, we can use the TypeScript and JavaScript values at the same time.

[leeoniya]

ok, i tried this again and it does all work properly if you use declare module 'uplot':

import uPlot, { Series, Options } from 'uplot';

declare module 'uplot' {
  interface Series {
    foo?: boolean
  }
}

const s1: Series       = { foo: true, stroke: "red" };
const s2: uPlot.Series = { foo: true, stroke: "red" };

let opts: Options = {
  width: 300,
  height: 300,
  series: [
    {},
    s1,
    s2,
  ]
};

new uPlot(opts, [[0, 1], [0, 1]], document.body);

[leeoniya]

i don’t think module augmentation works with the way React types are done, either: