@perry-rylance/midi-to-milliseconds/lib/d3-binarytree/extent.js

TypeScript library for resolving MIDI event times to milliseconds. Useful for syncing things like graphics to MIDI.

export default function(_) {
  return arguments.length
      ? this.cover(+_[0][0]).cover(+_[1][0])
      : isNaN(this._x0) ? undefined : [[this._x0], [this._x1]];
}