Get the document body dimensions in a flyd stream every time the user resizes the window.
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README.md

Generate a flyd stream for document size, in streams of pairs of [document.body.offsetWidth, document.body.offsetHeight]. Each pair is pushed to the stream whenever the user resizes their window.

import windowStream from 'flyd-windowresize'

windowStream() // [100, 200]
// user resizes window...
windowStream() // [400, 500]

halfSize$ = flyd.map(
  (pair) => [pair[0] / 2, pair[1] / 2]
, windowStream )