message: map-ify calls map
diff: @@ -74,8 +74,11 @@ import {base32} from "rfc4648";
  import QuestionDialog from "./components/views/dialogs/QuestionDialog";
  import ErrorDialog from "./components/views/dialogs/ErrorDialog";
  +// until we ts-ify the js-sdk voip code
  +type Call = any;
  +
  export default class CallHandler {
  - private calls = {};
  + private calls = new Map<string, Call>();
  private audioPromises = {};
  static sharedInstance() {
  @@ -101,16 +104,16 @@ export default class CallHandler {
  }
  }
  - getCallForRoom(roomId: string) {
  - return this.calls[roomId] || null;
  + getCallForRoom(roomId: string): Call {
  + return this.calls.get(roomId) || null;
  }
  getAnyActiveCall() {
  const roomsWithCalls = Object.keys(this.calls);
  for (let i = 0; i < roomsWithCalls.length; i++) {
  - if (this.calls[roomsWithCalls[i]] &&
  - this.calls[roomsWithCalls[i]].call_state !== "ended") {
  - return this.calls[roomsWithCalls[i]];
  + if (this.calls.get(roomsWithCalls[i]) &&
  + this.calls.get(roomsWithCalls[i]).call_state !== "ended") {
  + return this.calls.get(roomsWithCalls[i]);
  }
  }
  return null;
  @@ -219,7 +222,7 @@ export default class CallHandler {
  console.log(
  `Call state in ${roomId} changed to ${status} (${call ? call.call_state : "-"})`,
  );
  - this.calls[roomId] = call;
  + this.calls.set(roomId, call);
  if (status === "ringing") {
  this.play("ringAudio");
  @@ -368,18 +371,18 @@ export default class CallHandler {
  }
  break;
  case 'hangup':
  - if (!this.calls[payload.room_id]) {
  + if (!this.calls.get(payload.room_id)) {
  return; // no call to hangup
  }
  - this.calls[payload.room_id].hangup();
  + this.calls.get(payload.room_id).hangup();
  this.setCallState(null, payload.room_id, "ended");
  break;
  case 'answer':
  - if (!this.calls[payload.room_id]) {
  + if (!this.calls.get(payload.room_id)) {
  return; // no call to answer
  }
  - this.calls[payload.room_id].answer();
  - this.setCallState(this.calls[payload.room_id], payload.room_id, "connected");
  + this.calls.get(payload.room_id).answer();
  + this.setCallState(this.calls.get(payload.room_id), payload.room_id, "connected");
  dis.dispatch({
  action: "view_room",
  room_id: payload.room_id,
  