Index: node_modules/d3-sankey/src/sankey.js
===================================================================
--- node_modules/d3-sankey/src/sankey.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-sankey/src/sankey.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,369 @@
+import {max, min, sum} from "d3-array";
+import {justify} from "./align.js";
+import constant from "./constant.js";
+
+function ascendingSourceBreadth(a, b) {
+  return ascendingBreadth(a.source, b.source) || a.index - b.index;
+}
+
+function ascendingTargetBreadth(a, b) {
+  return ascendingBreadth(a.target, b.target) || a.index - b.index;
+}
+
+function ascendingBreadth(a, b) {
+  return a.y0 - b.y0;
+}
+
+function value(d) {
+  return d.value;
+}
+
+function defaultId(d) {
+  return d.index;
+}
+
+function defaultNodes(graph) {
+  return graph.nodes;
+}
+
+function defaultLinks(graph) {
+  return graph.links;
+}
+
+function find(nodeById, id) {
+  const node = nodeById.get(id);
+  if (!node) throw new Error("missing: " + id);
+  return node;
+}
+
+function computeLinkBreadths({nodes}) {
+  for (const node of nodes) {
+    let y0 = node.y0;
+    let y1 = y0;
+    for (const link of node.sourceLinks) {
+      link.y0 = y0 + link.width / 2;
+      y0 += link.width;
+    }
+    for (const link of node.targetLinks) {
+      link.y1 = y1 + link.width / 2;
+      y1 += link.width;
+    }
+  }
+}
+
+export default function Sankey() {
+  let x0 = 0, y0 = 0, x1 = 1, y1 = 1; // extent
+  let dx = 24; // nodeWidth
+  let dy = 8, py; // nodePadding
+  let id = defaultId;
+  let align = justify;
+  let sort;
+  let linkSort;
+  let nodes = defaultNodes;
+  let links = defaultLinks;
+  let iterations = 6;
+
+  function sankey() {
+    const graph = {nodes: nodes.apply(null, arguments), links: links.apply(null, arguments)};
+    computeNodeLinks(graph);
+    computeNodeValues(graph);
+    computeNodeDepths(graph);
+    computeNodeHeights(graph);
+    computeNodeBreadths(graph);
+    computeLinkBreadths(graph);
+    return graph;
+  }
+
+  sankey.update = function(graph) {
+    computeLinkBreadths(graph);
+    return graph;
+  };
+
+  sankey.nodeId = function(_) {
+    return arguments.length ? (id = typeof _ === "function" ? _ : constant(_), sankey) : id;
+  };
+
+  sankey.nodeAlign = function(_) {
+    return arguments.length ? (align = typeof _ === "function" ? _ : constant(_), sankey) : align;
+  };
+
+  sankey.nodeSort = function(_) {
+    return arguments.length ? (sort = _, sankey) : sort;
+  };
+
+  sankey.nodeWidth = function(_) {
+    return arguments.length ? (dx = +_, sankey) : dx;
+  };
+
+  sankey.nodePadding = function(_) {
+    return arguments.length ? (dy = py = +_, sankey) : dy;
+  };
+
+  sankey.nodes = function(_) {
+    return arguments.length ? (nodes = typeof _ === "function" ? _ : constant(_), sankey) : nodes;
+  };
+
+  sankey.links = function(_) {
+    return arguments.length ? (links = typeof _ === "function" ? _ : constant(_), sankey) : links;
+  };
+
+  sankey.linkSort = function(_) {
+    return arguments.length ? (linkSort = _, sankey) : linkSort;
+  };
+
+  sankey.size = function(_) {
+    return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], sankey) : [x1 - x0, y1 - y0];
+  };
+
+  sankey.extent = function(_) {
+    return arguments.length ? (x0 = +_[0][0], x1 = +_[1][0], y0 = +_[0][1], y1 = +_[1][1], sankey) : [[x0, y0], [x1, y1]];
+  };
+
+  sankey.iterations = function(_) {
+    return arguments.length ? (iterations = +_, sankey) : iterations;
+  };
+
+  function computeNodeLinks({nodes, links}) {
+    for (const [i, node] of nodes.entries()) {
+      node.index = i;
+      node.sourceLinks = [];
+      node.targetLinks = [];
+    }
+    const nodeById = new Map(nodes.map((d, i) => [id(d, i, nodes), d]));
+    for (const [i, link] of links.entries()) {
+      link.index = i;
+      let {source, target} = link;
+      if (typeof source !== "object") source = link.source = find(nodeById, source);
+      if (typeof target !== "object") target = link.target = find(nodeById, target);
+      source.sourceLinks.push(link);
+      target.targetLinks.push(link);
+    }
+    if (linkSort != null) {
+      for (const {sourceLinks, targetLinks} of nodes) {
+        sourceLinks.sort(linkSort);
+        targetLinks.sort(linkSort);
+      }
+    }
+  }
+
+  function computeNodeValues({nodes}) {
+    for (const node of nodes) {
+      node.value = node.fixedValue === undefined
+          ? Math.max(sum(node.sourceLinks, value), sum(node.targetLinks, value))
+          : node.fixedValue;
+    }
+  }
+
+  function computeNodeDepths({nodes}) {
+    const n = nodes.length;
+    let current = new Set(nodes);
+    let next = new Set;
+    let x = 0;
+    while (current.size) {
+      for (const node of current) {
+        node.depth = x;
+        for (const {target} of node.sourceLinks) {
+          next.add(target);
+        }
+      }
+      if (++x > n) throw new Error("circular link");
+      current = next;
+      next = new Set;
+    }
+  }
+
+  function computeNodeHeights({nodes}) {
+    const n = nodes.length;
+    let current = new Set(nodes);
+    let next = new Set;
+    let x = 0;
+    while (current.size) {
+      for (const node of current) {
+        node.height = x;
+        for (const {source} of node.targetLinks) {
+          next.add(source);
+        }
+      }
+      if (++x > n) throw new Error("circular link");
+      current = next;
+      next = new Set;
+    }
+  }
+
+  function computeNodeLayers({nodes}) {
+    const x = max(nodes, d => d.depth) + 1;
+    const kx = (x1 - x0 - dx) / (x - 1);
+    const columns = new Array(x);
+    for (const node of nodes) {
+      const i = Math.max(0, Math.min(x - 1, Math.floor(align.call(null, node, x))));
+      node.layer = i;
+      node.x0 = x0 + i * kx;
+      node.x1 = node.x0 + dx;
+      if (columns[i]) columns[i].push(node);
+      else columns[i] = [node];
+    }
+    if (sort) for (const column of columns) {
+      column.sort(sort);
+    }
+    return columns;
+  }
+
+  function initializeNodeBreadths(columns) {
+    const ky = min(columns, c => (y1 - y0 - (c.length - 1) * py) / sum(c, value));
+    for (const nodes of columns) {
+      let y = y0;
+      for (const node of nodes) {
+        node.y0 = y;
+        node.y1 = y + node.value * ky;
+        y = node.y1 + py;
+        for (const link of node.sourceLinks) {
+          link.width = link.value * ky;
+        }
+      }
+      y = (y1 - y + py) / (nodes.length + 1);
+      for (let i = 0; i < nodes.length; ++i) {
+        const node = nodes[i];
+        node.y0 += y * (i + 1);
+        node.y1 += y * (i + 1);
+      }
+      reorderLinks(nodes);
+    }
+  }
+
+  function computeNodeBreadths(graph) {
+    const columns = computeNodeLayers(graph);
+    py = Math.min(dy, (y1 - y0) / (max(columns, c => c.length) - 1));
+    initializeNodeBreadths(columns);
+    for (let i = 0; i < iterations; ++i) {
+      const alpha = Math.pow(0.99, i);
+      const beta = Math.max(1 - alpha, (i + 1) / iterations);
+      relaxRightToLeft(columns, alpha, beta);
+      relaxLeftToRight(columns, alpha, beta);
+    }
+  }
+
+  // Reposition each node based on its incoming (target) links.
+  function relaxLeftToRight(columns, alpha, beta) {
+    for (let i = 1, n = columns.length; i < n; ++i) {
+      const column = columns[i];
+      for (const target of column) {
+        let y = 0;
+        let w = 0;
+        for (const {source, value} of target.targetLinks) {
+          let v = value * (target.layer - source.layer);
+          y += targetTop(source, target) * v;
+          w += v;
+        }
+        if (!(w > 0)) continue;
+        let dy = (y / w - target.y0) * alpha;
+        target.y0 += dy;
+        target.y1 += dy;
+        reorderNodeLinks(target);
+      }
+      if (sort === undefined) column.sort(ascendingBreadth);
+      resolveCollisions(column, beta);
+    }
+  }
+
+  // Reposition each node based on its outgoing (source) links.
+  function relaxRightToLeft(columns, alpha, beta) {
+    for (let n = columns.length, i = n - 2; i >= 0; --i) {
+      const column = columns[i];
+      for (const source of column) {
+        let y = 0;
+        let w = 0;
+        for (const {target, value} of source.sourceLinks) {
+          let v = value * (target.layer - source.layer);
+          y += sourceTop(source, target) * v;
+          w += v;
+        }
+        if (!(w > 0)) continue;
+        let dy = (y / w - source.y0) * alpha;
+        source.y0 += dy;
+        source.y1 += dy;
+        reorderNodeLinks(source);
+      }
+      if (sort === undefined) column.sort(ascendingBreadth);
+      resolveCollisions(column, beta);
+    }
+  }
+
+  function resolveCollisions(nodes, alpha) {
+    const i = nodes.length >> 1;
+    const subject = nodes[i];
+    resolveCollisionsBottomToTop(nodes, subject.y0 - py, i - 1, alpha);
+    resolveCollisionsTopToBottom(nodes, subject.y1 + py, i + 1, alpha);
+    resolveCollisionsBottomToTop(nodes, y1, nodes.length - 1, alpha);
+    resolveCollisionsTopToBottom(nodes, y0, 0, alpha);
+  }
+
+  // Push any overlapping nodes down.
+  function resolveCollisionsTopToBottom(nodes, y, i, alpha) {
+    for (; i < nodes.length; ++i) {
+      const node = nodes[i];
+      const dy = (y - node.y0) * alpha;
+      if (dy > 1e-6) node.y0 += dy, node.y1 += dy;
+      y = node.y1 + py;
+    }
+  }
+
+  // Push any overlapping nodes up.
+  function resolveCollisionsBottomToTop(nodes, y, i, alpha) {
+    for (; i >= 0; --i) {
+      const node = nodes[i];
+      const dy = (node.y1 - y) * alpha;
+      if (dy > 1e-6) node.y0 -= dy, node.y1 -= dy;
+      y = node.y0 - py;
+    }
+  }
+
+  function reorderNodeLinks({sourceLinks, targetLinks}) {
+    if (linkSort === undefined) {
+      for (const {source: {sourceLinks}} of targetLinks) {
+        sourceLinks.sort(ascendingTargetBreadth);
+      }
+      for (const {target: {targetLinks}} of sourceLinks) {
+        targetLinks.sort(ascendingSourceBreadth);
+      }
+    }
+  }
+
+  function reorderLinks(nodes) {
+    if (linkSort === undefined) {
+      for (const {sourceLinks, targetLinks} of nodes) {
+        sourceLinks.sort(ascendingTargetBreadth);
+        targetLinks.sort(ascendingSourceBreadth);
+      }
+    }
+  }
+
+  // Returns the target.y0 that would produce an ideal link from source to target.
+  function targetTop(source, target) {
+    let y = source.y0 - (source.sourceLinks.length - 1) * py / 2;
+    for (const {target: node, width} of source.sourceLinks) {
+      if (node === target) break;
+      y += width + py;
+    }
+    for (const {source: node, width} of target.targetLinks) {
+      if (node === source) break;
+      y -= width;
+    }
+    return y;
+  }
+
+  // Returns the source.y0 that would produce an ideal link from source to target.
+  function sourceTop(source, target) {
+    let y = target.y0 - (target.targetLinks.length - 1) * py / 2;
+    for (const {source: node, width} of target.targetLinks) {
+      if (node === source) break;
+      y += width + py;
+    }
+    for (const {target: node, width} of source.sourceLinks) {
+      if (node === target) break;
+      y -= width;
+    }
+    return y;
+  }
+
+  return sankey;
+}