Index: node_modules/d3-transition/src/transition/attr.js
===================================================================
--- node_modules/d3-transition/src/transition/attr.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/attr.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,78 @@
+import {interpolateTransformSvg as interpolateTransform} from "d3-interpolate";
+import {namespace} from "d3-selection";
+import {tweenValue} from "./tween.js";
+import interpolate from "./interpolate.js";
+
+function attrRemove(name) {
+  return function() {
+    this.removeAttribute(name);
+  };
+}
+
+function attrRemoveNS(fullname) {
+  return function() {
+    this.removeAttributeNS(fullname.space, fullname.local);
+  };
+}
+
+function attrConstant(name, interpolate, value1) {
+  var string00,
+      string1 = value1 + "",
+      interpolate0;
+  return function() {
+    var string0 = this.getAttribute(name);
+    return string0 === string1 ? null
+        : string0 === string00 ? interpolate0
+        : interpolate0 = interpolate(string00 = string0, value1);
+  };
+}
+
+function attrConstantNS(fullname, interpolate, value1) {
+  var string00,
+      string1 = value1 + "",
+      interpolate0;
+  return function() {
+    var string0 = this.getAttributeNS(fullname.space, fullname.local);
+    return string0 === string1 ? null
+        : string0 === string00 ? interpolate0
+        : interpolate0 = interpolate(string00 = string0, value1);
+  };
+}
+
+function attrFunction(name, interpolate, value) {
+  var string00,
+      string10,
+      interpolate0;
+  return function() {
+    var string0, value1 = value(this), string1;
+    if (value1 == null) return void this.removeAttribute(name);
+    string0 = this.getAttribute(name);
+    string1 = value1 + "";
+    return string0 === string1 ? null
+        : string0 === string00 && string1 === string10 ? interpolate0
+        : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+  };
+}
+
+function attrFunctionNS(fullname, interpolate, value) {
+  var string00,
+      string10,
+      interpolate0;
+  return function() {
+    var string0, value1 = value(this), string1;
+    if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
+    string0 = this.getAttributeNS(fullname.space, fullname.local);
+    string1 = value1 + "";
+    return string0 === string1 ? null
+        : string0 === string00 && string1 === string10 ? interpolate0
+        : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+  };
+}
+
+export default function(name, value) {
+  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransform : interpolate;
+  return this.attrTween(name, typeof value === "function"
+      ? (fullname.local ? attrFunctionNS : attrFunction)(fullname, i, tweenValue(this, "attr." + name, value))
+      : value == null ? (fullname.local ? attrRemoveNS : attrRemove)(fullname)
+      : (fullname.local ? attrConstantNS : attrConstant)(fullname, i, value));
+}
Index: node_modules/d3-transition/src/transition/attrTween.js
===================================================================
--- node_modules/d3-transition/src/transition/attrTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/attrTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,44 @@
+import {namespace} from "d3-selection";
+
+function attrInterpolate(name, i) {
+  return function(t) {
+    this.setAttribute(name, i.call(this, t));
+  };
+}
+
+function attrInterpolateNS(fullname, i) {
+  return function(t) {
+    this.setAttributeNS(fullname.space, fullname.local, i.call(this, t));
+  };
+}
+
+function attrTweenNS(fullname, value) {
+  var t0, i0;
+  function tween() {
+    var i = value.apply(this, arguments);
+    if (i !== i0) t0 = (i0 = i) && attrInterpolateNS(fullname, i);
+    return t0;
+  }
+  tween._value = value;
+  return tween;
+}
+
+function attrTween(name, value) {
+  var t0, i0;
+  function tween() {
+    var i = value.apply(this, arguments);
+    if (i !== i0) t0 = (i0 = i) && attrInterpolate(name, i);
+    return t0;
+  }
+  tween._value = value;
+  return tween;
+}
+
+export default function(name, value) {
+  var key = "attr." + name;
+  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+  if (value == null) return this.tween(key, null);
+  if (typeof value !== "function") throw new Error;
+  var fullname = namespace(name);
+  return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
+}
Index: node_modules/d3-transition/src/transition/delay.js
===================================================================
--- node_modules/d3-transition/src/transition/delay.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/delay.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,23 @@
+import {get, init} from "./schedule.js";
+
+function delayFunction(id, value) {
+  return function() {
+    init(this, id).delay = +value.apply(this, arguments);
+  };
+}
+
+function delayConstant(id, value) {
+  return value = +value, function() {
+    init(this, id).delay = value;
+  };
+}
+
+export default function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each((typeof value === "function"
+          ? delayFunction
+          : delayConstant)(id, value))
+      : get(this.node(), id).delay;
+}
Index: node_modules/d3-transition/src/transition/duration.js
===================================================================
--- node_modules/d3-transition/src/transition/duration.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/duration.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,23 @@
+import {get, set} from "./schedule.js";
+
+function durationFunction(id, value) {
+  return function() {
+    set(this, id).duration = +value.apply(this, arguments);
+  };
+}
+
+function durationConstant(id, value) {
+  return value = +value, function() {
+    set(this, id).duration = value;
+  };
+}
+
+export default function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each((typeof value === "function"
+          ? durationFunction
+          : durationConstant)(id, value))
+      : get(this.node(), id).duration;
+}
Index: node_modules/d3-transition/src/transition/ease.js
===================================================================
--- node_modules/d3-transition/src/transition/ease.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/ease.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,16 @@
+import {get, set} from "./schedule.js";
+
+function easeConstant(id, value) {
+  if (typeof value !== "function") throw new Error;
+  return function() {
+    set(this, id).ease = value;
+  };
+}
+
+export default function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each(easeConstant(id, value))
+      : get(this.node(), id).ease;
+}
Index: node_modules/d3-transition/src/transition/easeVarying.js
===================================================================
--- node_modules/d3-transition/src/transition/easeVarying.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/easeVarying.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,14 @@
+import {set} from "./schedule.js";
+
+function easeVarying(id, value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (typeof v !== "function") throw new Error;
+    set(this, id).ease = v;
+  };
+}
+
+export default function(value) {
+  if (typeof value !== "function") throw new Error;
+  return this.each(easeVarying(this._id, value));
+}
Index: node_modules/d3-transition/src/transition/end.js
===================================================================
--- node_modules/d3-transition/src/transition/end.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/end.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,29 @@
+import {set} from "./schedule.js";
+
+export default function() {
+  var on0, on1, that = this, id = that._id, size = that.size();
+  return new Promise(function(resolve, reject) {
+    var cancel = {value: reject},
+        end = {value: function() { if (--size === 0) resolve(); }};
+
+    that.each(function() {
+      var schedule = set(this, id),
+          on = schedule.on;
+
+      // If this node shared a dispatch with the previous node,
+      // just assign the updated shared dispatch and we’re done!
+      // Otherwise, copy-on-write.
+      if (on !== on0) {
+        on1 = (on0 = on).copy();
+        on1._.cancel.push(cancel);
+        on1._.interrupt.push(cancel);
+        on1._.end.push(end);
+      }
+
+      schedule.on = on1;
+    });
+
+    // The selection was empty, resolve end immediately
+    if (size === 0) resolve();
+  });
+}
Index: node_modules/d3-transition/src/transition/filter.js
===================================================================
--- node_modules/d3-transition/src/transition/filter.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/filter.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,16 @@
+import {matcher} from "d3-selection";
+import {Transition} from "./index.js";
+
+export default function(match) {
+  if (typeof match !== "function") match = matcher(match);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
+      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
+        subgroup.push(node);
+      }
+    }
+  }
+
+  return new Transition(subgroups, this._parents, this._name, this._id);
+}
Index: node_modules/d3-transition/src/transition/index.js
===================================================================
--- node_modules/d3-transition/src/transition/index.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/index.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,73 @@
+import {selection} from "d3-selection";
+import transition_attr from "./attr.js";
+import transition_attrTween from "./attrTween.js";
+import transition_delay from "./delay.js";
+import transition_duration from "./duration.js";
+import transition_ease from "./ease.js";
+import transition_easeVarying from "./easeVarying.js";
+import transition_filter from "./filter.js";
+import transition_merge from "./merge.js";
+import transition_on from "./on.js";
+import transition_remove from "./remove.js";
+import transition_select from "./select.js";
+import transition_selectAll from "./selectAll.js";
+import transition_selection from "./selection.js";
+import transition_style from "./style.js";
+import transition_styleTween from "./styleTween.js";
+import transition_text from "./text.js";
+import transition_textTween from "./textTween.js";
+import transition_transition from "./transition.js";
+import transition_tween from "./tween.js";
+import transition_end from "./end.js";
+
+var id = 0;
+
+export function Transition(groups, parents, name, id) {
+  this._groups = groups;
+  this._parents = parents;
+  this._name = name;
+  this._id = id;
+}
+
+export default function transition(name) {
+  return selection().transition(name);
+}
+
+export function newId() {
+  return ++id;
+}
+
+var selection_prototype = selection.prototype;
+
+Transition.prototype = transition.prototype = {
+  constructor: Transition,
+  select: transition_select,
+  selectAll: transition_selectAll,
+  selectChild: selection_prototype.selectChild,
+  selectChildren: selection_prototype.selectChildren,
+  filter: transition_filter,
+  merge: transition_merge,
+  selection: transition_selection,
+  transition: transition_transition,
+  call: selection_prototype.call,
+  nodes: selection_prototype.nodes,
+  node: selection_prototype.node,
+  size: selection_prototype.size,
+  empty: selection_prototype.empty,
+  each: selection_prototype.each,
+  on: transition_on,
+  attr: transition_attr,
+  attrTween: transition_attrTween,
+  style: transition_style,
+  styleTween: transition_styleTween,
+  text: transition_text,
+  textTween: transition_textTween,
+  remove: transition_remove,
+  tween: transition_tween,
+  delay: transition_delay,
+  duration: transition_duration,
+  ease: transition_ease,
+  easeVarying: transition_easeVarying,
+  end: transition_end,
+  [Symbol.iterator]: selection_prototype[Symbol.iterator]
+};
Index: node_modules/d3-transition/src/transition/interpolate.js
===================================================================
--- node_modules/d3-transition/src/transition/interpolate.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/interpolate.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,10 @@
+import {color} from "d3-color";
+import {interpolateNumber, interpolateRgb, interpolateString} from "d3-interpolate";
+
+export default function(a, b) {
+  var c;
+  return (typeof b === "number" ? interpolateNumber
+      : b instanceof color ? interpolateRgb
+      : (c = color(b)) ? (b = c, interpolateRgb)
+      : interpolateString)(a, b);
+}
Index: node_modules/d3-transition/src/transition/merge.js
===================================================================
--- node_modules/d3-transition/src/transition/merge.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/merge.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,19 @@
+import {Transition} from "./index.js";
+
+export default function(transition) {
+  if (transition._id !== this._id) throw new Error;
+
+  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
+      if (node = group0[i] || group1[i]) {
+        merge[i] = node;
+      }
+    }
+  }
+
+  for (; j < m0; ++j) {
+    merges[j] = groups0[j];
+  }
+
+  return new Transition(merges, this._parents, this._name, this._id);
+}
Index: node_modules/d3-transition/src/transition/on.js
===================================================================
--- node_modules/d3-transition/src/transition/on.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/on.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,32 @@
+import {get, set, init} from "./schedule.js";
+
+function start(name) {
+  return (name + "").trim().split(/^|\s+/).every(function(t) {
+    var i = t.indexOf(".");
+    if (i >= 0) t = t.slice(0, i);
+    return !t || t === "start";
+  });
+}
+
+function onFunction(id, name, listener) {
+  var on0, on1, sit = start(name) ? init : set;
+  return function() {
+    var schedule = sit(this, id),
+        on = schedule.on;
+
+    // If this node shared a dispatch with the previous node,
+    // just assign the updated shared dispatch and we’re done!
+    // Otherwise, copy-on-write.
+    if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);
+
+    schedule.on = on1;
+  };
+}
+
+export default function(name, listener) {
+  var id = this._id;
+
+  return arguments.length < 2
+      ? get(this.node(), id).on.on(name)
+      : this.each(onFunction(id, name, listener));
+}
Index: node_modules/d3-transition/src/transition/remove.js
===================================================================
--- node_modules/d3-transition/src/transition/remove.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/remove.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,11 @@
+function removeFunction(id) {
+  return function() {
+    var parent = this.parentNode;
+    for (var i in this.__transition) if (+i !== id) return;
+    if (parent) parent.removeChild(this);
+  };
+}
+
+export default function() {
+  return this.on("end.remove", removeFunction(this._id));
+}
Index: node_modules/d3-transition/src/transition/schedule.js
===================================================================
--- node_modules/d3-transition/src/transition/schedule.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/schedule.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,153 @@
+import {dispatch} from "d3-dispatch";
+import {timer, timeout} from "d3-timer";
+
+var emptyOn = dispatch("start", "end", "cancel", "interrupt");
+var emptyTween = [];
+
+export var CREATED = 0;
+export var SCHEDULED = 1;
+export var STARTING = 2;
+export var STARTED = 3;
+export var RUNNING = 4;
+export var ENDING = 5;
+export var ENDED = 6;
+
+export default function(node, name, id, index, group, timing) {
+  var schedules = node.__transition;
+  if (!schedules) node.__transition = {};
+  else if (id in schedules) return;
+  create(node, id, {
+    name: name,
+    index: index, // For context during callback.
+    group: group, // For context during callback.
+    on: emptyOn,
+    tween: emptyTween,
+    time: timing.time,
+    delay: timing.delay,
+    duration: timing.duration,
+    ease: timing.ease,
+    timer: null,
+    state: CREATED
+  });
+}
+
+export function init(node, id) {
+  var schedule = get(node, id);
+  if (schedule.state > CREATED) throw new Error("too late; already scheduled");
+  return schedule;
+}
+
+export function set(node, id) {
+  var schedule = get(node, id);
+  if (schedule.state > STARTED) throw new Error("too late; already running");
+  return schedule;
+}
+
+export function get(node, id) {
+  var schedule = node.__transition;
+  if (!schedule || !(schedule = schedule[id])) throw new Error("transition not found");
+  return schedule;
+}
+
+function create(node, id, self) {
+  var schedules = node.__transition,
+      tween;
+
+  // Initialize the self timer when the transition is created.
+  // Note the actual delay is not known until the first callback!
+  schedules[id] = self;
+  self.timer = timer(schedule, 0, self.time);
+
+  function schedule(elapsed) {
+    self.state = SCHEDULED;
+    self.timer.restart(start, self.delay, self.time);
+
+    // If the elapsed delay is less than our first sleep, start immediately.
+    if (self.delay <= elapsed) start(elapsed - self.delay);
+  }
+
+  function start(elapsed) {
+    var i, j, n, o;
+
+    // If the state is not SCHEDULED, then we previously errored on start.
+    if (self.state !== SCHEDULED) return stop();
+
+    for (i in schedules) {
+      o = schedules[i];
+      if (o.name !== self.name) continue;
+
+      // While this element already has a starting transition during this frame,
+      // defer starting an interrupting transition until that transition has a
+      // chance to tick (and possibly end); see d3/d3-transition#54!
+      if (o.state === STARTED) return timeout(start);
+
+      // Interrupt the active transition, if any.
+      if (o.state === RUNNING) {
+        o.state = ENDED;
+        o.timer.stop();
+        o.on.call("interrupt", node, node.__data__, o.index, o.group);
+        delete schedules[i];
+      }
+
+      // Cancel any pre-empted transitions.
+      else if (+i < id) {
+        o.state = ENDED;
+        o.timer.stop();
+        o.on.call("cancel", node, node.__data__, o.index, o.group);
+        delete schedules[i];
+      }
+    }
+
+    // Defer the first tick to end of the current frame; see d3/d3#1576.
+    // Note the transition may be canceled after start and before the first tick!
+    // Note this must be scheduled before the start event; see d3/d3-transition#16!
+    // Assuming this is successful, subsequent callbacks go straight to tick.
+    timeout(function() {
+      if (self.state === STARTED) {
+        self.state = RUNNING;
+        self.timer.restart(tick, self.delay, self.time);
+        tick(elapsed);
+      }
+    });
+
+    // Dispatch the start event.
+    // Note this must be done before the tween are initialized.
+    self.state = STARTING;
+    self.on.call("start", node, node.__data__, self.index, self.group);
+    if (self.state !== STARTING) return; // interrupted
+    self.state = STARTED;
+
+    // Initialize the tween, deleting null tween.
+    tween = new Array(n = self.tween.length);
+    for (i = 0, j = -1; i < n; ++i) {
+      if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
+        tween[++j] = o;
+      }
+    }
+    tween.length = j + 1;
+  }
+
+  function tick(elapsed) {
+    var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
+        i = -1,
+        n = tween.length;
+
+    while (++i < n) {
+      tween[i].call(node, t);
+    }
+
+    // Dispatch the end event.
+    if (self.state === ENDING) {
+      self.on.call("end", node, node.__data__, self.index, self.group);
+      stop();
+    }
+  }
+
+  function stop() {
+    self.state = ENDED;
+    self.timer.stop();
+    delete schedules[id];
+    for (var i in schedules) return; // eslint-disable-line no-unused-vars
+    delete node.__transition;
+  }
+}
Index: node_modules/d3-transition/src/transition/select.js
===================================================================
--- node_modules/d3-transition/src/transition/select.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/select.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,22 @@
+import {selector} from "d3-selection";
+import {Transition} from "./index.js";
+import schedule, {get} from "./schedule.js";
+
+export default function(select) {
+  var name = this._name,
+      id = this._id;
+
+  if (typeof select !== "function") select = selector(select);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
+        if ("__data__" in node) subnode.__data__ = node.__data__;
+        subgroup[i] = subnode;
+        schedule(subgroup[i], name, id, i, subgroup, get(node, id));
+      }
+    }
+  }
+
+  return new Transition(subgroups, this._parents, name, id);
+}
Index: node_modules/d3-transition/src/transition/selectAll.js
===================================================================
--- node_modules/d3-transition/src/transition/selectAll.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/selectAll.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,26 @@
+import {selectorAll} from "d3-selection";
+import {Transition} from "./index.js";
+import schedule, {get} from "./schedule.js";
+
+export default function(select) {
+  var name = this._name,
+      id = this._id;
+
+  if (typeof select !== "function") select = selectorAll(select);
+
+  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        for (var children = select.call(node, node.__data__, i, group), child, inherit = get(node, id), k = 0, l = children.length; k < l; ++k) {
+          if (child = children[k]) {
+            schedule(child, name, id, k, children, inherit);
+          }
+        }
+        subgroups.push(children);
+        parents.push(node);
+      }
+    }
+  }
+
+  return new Transition(subgroups, parents, name, id);
+}
Index: node_modules/d3-transition/src/transition/selection.js
===================================================================
--- node_modules/d3-transition/src/transition/selection.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/selection.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,7 @@
+import {selection} from "d3-selection";
+
+var Selection = selection.prototype.constructor;
+
+export default function() {
+  return new Selection(this._groups, this._parents);
+}
Index: node_modules/d3-transition/src/transition/style.js
===================================================================
--- node_modules/d3-transition/src/transition/style.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/style.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,80 @@
+import {interpolateTransformCss as interpolateTransform} from "d3-interpolate";
+import {style} from "d3-selection";
+import {set} from "./schedule.js";
+import {tweenValue} from "./tween.js";
+import interpolate from "./interpolate.js";
+
+function styleNull(name, interpolate) {
+  var string00,
+      string10,
+      interpolate0;
+  return function() {
+    var string0 = style(this, name),
+        string1 = (this.style.removeProperty(name), style(this, name));
+    return string0 === string1 ? null
+        : string0 === string00 && string1 === string10 ? interpolate0
+        : interpolate0 = interpolate(string00 = string0, string10 = string1);
+  };
+}
+
+function styleRemove(name) {
+  return function() {
+    this.style.removeProperty(name);
+  };
+}
+
+function styleConstant(name, interpolate, value1) {
+  var string00,
+      string1 = value1 + "",
+      interpolate0;
+  return function() {
+    var string0 = style(this, name);
+    return string0 === string1 ? null
+        : string0 === string00 ? interpolate0
+        : interpolate0 = interpolate(string00 = string0, value1);
+  };
+}
+
+function styleFunction(name, interpolate, value) {
+  var string00,
+      string10,
+      interpolate0;
+  return function() {
+    var string0 = style(this, name),
+        value1 = value(this),
+        string1 = value1 + "";
+    if (value1 == null) string1 = value1 = (this.style.removeProperty(name), style(this, name));
+    return string0 === string1 ? null
+        : string0 === string00 && string1 === string10 ? interpolate0
+        : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+  };
+}
+
+function styleMaybeRemove(id, name) {
+  var on0, on1, listener0, key = "style." + name, event = "end." + key, remove;
+  return function() {
+    var schedule = set(this, id),
+        on = schedule.on,
+        listener = schedule.value[key] == null ? remove || (remove = styleRemove(name)) : undefined;
+
+    // If this node shared a dispatch with the previous node,
+    // just assign the updated shared dispatch and we’re done!
+    // Otherwise, copy-on-write.
+    if (on !== on0 || listener0 !== listener) (on1 = (on0 = on).copy()).on(event, listener0 = listener);
+
+    schedule.on = on1;
+  };
+}
+
+export default function(name, value, priority) {
+  var i = (name += "") === "transform" ? interpolateTransform : interpolate;
+  return value == null ? this
+      .styleTween(name, styleNull(name, i))
+      .on("end.style." + name, styleRemove(name))
+    : typeof value === "function" ? this
+      .styleTween(name, styleFunction(name, i, tweenValue(this, "style." + name, value)))
+      .each(styleMaybeRemove(this._id, name))
+    : this
+      .styleTween(name, styleConstant(name, i, value), priority)
+      .on("end.style." + name, null);
+}
Index: node_modules/d3-transition/src/transition/styleTween.js
===================================================================
--- node_modules/d3-transition/src/transition/styleTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/styleTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,24 @@
+function styleInterpolate(name, i, priority) {
+  return function(t) {
+    this.style.setProperty(name, i.call(this, t), priority);
+  };
+}
+
+function styleTween(name, value, priority) {
+  var t, i0;
+  function tween() {
+    var i = value.apply(this, arguments);
+    if (i !== i0) t = (i0 = i) && styleInterpolate(name, i, priority);
+    return t;
+  }
+  tween._value = value;
+  return tween;
+}
+
+export default function(name, value, priority) {
+  var key = "style." + (name += "");
+  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+  if (value == null) return this.tween(key, null);
+  if (typeof value !== "function") throw new Error;
+  return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
+}
Index: node_modules/d3-transition/src/transition/text.js
===================================================================
--- node_modules/d3-transition/src/transition/text.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/text.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,20 @@
+import {tweenValue} from "./tween.js";
+
+function textConstant(value) {
+  return function() {
+    this.textContent = value;
+  };
+}
+
+function textFunction(value) {
+  return function() {
+    var value1 = value(this);
+    this.textContent = value1 == null ? "" : value1;
+  };
+}
+
+export default function(value) {
+  return this.tween("text", typeof value === "function"
+      ? textFunction(tweenValue(this, "text", value))
+      : textConstant(value == null ? "" : value + ""));
+}
Index: node_modules/d3-transition/src/transition/textTween.js
===================================================================
--- node_modules/d3-transition/src/transition/textTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/textTween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,24 @@
+function textInterpolate(i) {
+  return function(t) {
+    this.textContent = i.call(this, t);
+  };
+}
+
+function textTween(value) {
+  var t0, i0;
+  function tween() {
+    var i = value.apply(this, arguments);
+    if (i !== i0) t0 = (i0 = i) && textInterpolate(i);
+    return t0;
+  }
+  tween._value = value;
+  return tween;
+}
+
+export default function(value) {
+  var key = "text";
+  if (arguments.length < 1) return (key = this.tween(key)) && key._value;
+  if (value == null) return this.tween(key, null);
+  if (typeof value !== "function") throw new Error;
+  return this.tween(key, textTween(value));
+}
Index: node_modules/d3-transition/src/transition/transition.js
===================================================================
--- node_modules/d3-transition/src/transition/transition.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/transition.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,24 @@
+import {Transition, newId} from "./index.js";
+import schedule, {get} from "./schedule.js";
+
+export default function() {
+  var name = this._name,
+      id0 = this._id,
+      id1 = newId();
+
+  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        var inherit = get(node, id0);
+        schedule(node, name, id1, i, group, {
+          time: inherit.time + inherit.delay + inherit.duration,
+          delay: 0,
+          duration: inherit.duration,
+          ease: inherit.ease
+        });
+      }
+    }
+  }
+
+  return new Transition(groups, this._parents, name, id1);
+}
Index: node_modules/d3-transition/src/transition/tween.js
===================================================================
--- node_modules/d3-transition/src/transition/tween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-transition/src/transition/tween.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,81 @@
+import {get, set} from "./schedule.js";
+
+function tweenRemove(id, name) {
+  var tween0, tween1;
+  return function() {
+    var schedule = set(this, id),
+        tween = schedule.tween;
+
+    // If this node shared tween with the previous node,
+    // just assign the updated shared tween and we’re done!
+    // Otherwise, copy-on-write.
+    if (tween !== tween0) {
+      tween1 = tween0 = tween;
+      for (var i = 0, n = tween1.length; i < n; ++i) {
+        if (tween1[i].name === name) {
+          tween1 = tween1.slice();
+          tween1.splice(i, 1);
+          break;
+        }
+      }
+    }
+
+    schedule.tween = tween1;
+  };
+}
+
+function tweenFunction(id, name, value) {
+  var tween0, tween1;
+  if (typeof value !== "function") throw new Error;
+  return function() {
+    var schedule = set(this, id),
+        tween = schedule.tween;
+
+    // If this node shared tween with the previous node,
+    // just assign the updated shared tween and we’re done!
+    // Otherwise, copy-on-write.
+    if (tween !== tween0) {
+      tween1 = (tween0 = tween).slice();
+      for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
+        if (tween1[i].name === name) {
+          tween1[i] = t;
+          break;
+        }
+      }
+      if (i === n) tween1.push(t);
+    }
+
+    schedule.tween = tween1;
+  };
+}
+
+export default function(name, value) {
+  var id = this._id;
+
+  name += "";
+
+  if (arguments.length < 2) {
+    var tween = get(this.node(), id).tween;
+    for (var i = 0, n = tween.length, t; i < n; ++i) {
+      if ((t = tween[i]).name === name) {
+        return t.value;
+      }
+    }
+    return null;
+  }
+
+  return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
+}
+
+export function tweenValue(transition, name, value) {
+  var id = transition._id;
+
+  transition.each(function() {
+    var schedule = set(this, id);
+    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
+  });
+
+  return function(node) {
+    return get(node, id).value[name];
+  };
+}