{
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  "padding": 5,
  "width": 800,
  "height": 300,
  "style": "cell",
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        {"ts": 1500500000000, "v": 2},
        {"ts": 1500600000000, "v": 3},
        {"ts": 1500700000000, "v": 2}
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    },
    {
      "name": "data_0",
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      "transform": [
        {"type": "formula", "expr": "toDate(datum[\"ts\"])", "as": "ts"}
      ]
    }
  ],
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    {
      "name": "marks",
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      "style": ["line"],
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      "from": {"data": "data_0"},
      "encode": {
        "update": {
          "stroke": {"value": "#4c78a8"},
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            "signal": "\"ts: \" + (timeFormat(datum[\"ts\"], '%b %d, %Y')) + \"; v: \" + (format(datum[\"v\"], \"\"))"
          },
          "x": {"scale": "x", "field": "ts"},
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            "signal": "isValid(datum[\"ts\"]) && isFinite(+datum[\"ts\"]) && isValid(datum[\"v\"]) && isFinite(+datum[\"v\"])"
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    },
    {
      "name": "y",
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      "range": [{"signal": "height"}, 0],
      "zero": true
    }
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    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
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      "scale": "x",
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      "grid": false,
      "title": "ts",
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "zindex": 0
    },
    {
      "scale": "y",
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      "grid": false,
      "title": "v",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
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}