{"ast":null,"code":"import array from \"./array.js\";\nimport constant from \"./constant.js\";\nimport curveLinear from \"./curve/linear.js\";\nimport line from \"./line.js\";\nimport { withPath } from \"./path.js\";\nimport { x as pointX, y as pointY } from \"./point.js\";\nexport default function (x0, y0, y1) {\n  var x1 = null,\n    defined = constant(true),\n    context = null,\n    curve = curveLinear,\n    output = null,\n    path = withPath(area);\n  x0 = typeof x0 === \"function\" ? x0 : x0 === undefined ? pointX : constant(+x0);\n  y0 = typeof y0 === \"function\" ? y0 : y0 === undefined ? constant(0) : constant(+y0);\n  y1 = typeof y1 === \"function\" ? y1 : y1 === undefined ? pointY : constant(+y1);\n  function area(data) {\n    var i,\n      j,\n      k,\n      n = (data = array(data)).length,\n      d,\n      defined0 = false,\n      buffer,\n      x0z = new Array(n),\n      y0z = new Array(n);\n    if (context == null) output = curve(buffer = path());\n    for (i = 0; i <= n; ++i) {\n      if (!(i < n && defined(d = data[i], i, data)) === defined0) {\n        if (defined0 = !defined0) {\n          j = i;\n          output.areaStart();\n          output.lineStart();\n        } else {\n          output.lineEnd();\n          output.lineStart();\n          for (k = i - 1; k >= j; --k) {\n            output.point(x0z[k], y0z[k]);\n          }\n          output.lineEnd();\n          output.areaEnd();\n        }\n      }\n      if (defined0) {\n        x0z[i] = +x0(d, i, data), y0z[i] = +y0(d, i, data);\n        output.point(x1 ? +x1(d, i, data) : x0z[i], y1 ? +y1(d, i, data) : y0z[i]);\n      }\n    }\n    if (buffer) return output = null, buffer + \"\" || null;\n  }\n  function arealine() {\n    return line().defined(defined).curve(curve).context(context);\n  }\n  area.x = function (_) {\n    return arguments.length ? (x0 = typeof _ === \"function\" ? _ : constant(+_), x1 = null, area) : x0;\n  };\n  area.x0 = function (_) {\n    return arguments.length ? (x0 = typeof _ === \"function\" ? _ : constant(+_), area) : x0;\n  };\n  area.x1 = function (_) {\n    return arguments.length ? (x1 = _ == null ? null : typeof _ === \"function\" ? _ : constant(+_), area) : x1;\n  };\n  area.y = function (_) {\n    return arguments.length ? (y0 = typeof _ === \"function\" ? _ : constant(+_), y1 = null, area) : y0;\n  };\n  area.y0 = function (_) {\n    return arguments.length ? (y0 = typeof _ === \"function\" ? _ : constant(+_), area) : y0;\n  };\n  area.y1 = function (_) {\n    return arguments.length ? 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