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README.md

daily-js

The official front-end library for the Daily.co video calling API.

  • Manage call lifecycle and participant state
  • Respond to in-call events
  • Customize call layout and UI

More information about the Daily.co API for video calls here:

https://www.daily.co/api

API "getting started" info and reference docs for creating and managing rooms, permission tokens, recordings, and other resources are here:

https://docs.daily.co/reference

Demos and sample code for this library are here:

https://github.com/daily-co/daily-js/tree/master/demo

Using this library

You can use this library from a <script> tag, as a CommonJS-style module with require, or as an ES6-style module with import (including within a <script type="module"> context).

The easiest way to get started is to load this library from unpkg, and add a couple of lines of code to your web page or app.

<script crossorigin src="https://unpkg.com/@daily-co/daily-js"></script>
<script>
function createFrameAndJoinRoom() {
  window.callFrame = window.DailyIframe.createFrame();
  callFrame.join({ url: A_DAILY_CO_ROOM_URL });
}
</script>

Here's a very simple working demo/template:

https://github.com/daily-co/daily-js/blob/master/demo/basics.html

More demos are available in the demo/ directory.

Of course, you can also use a bundler like webpack or rollup.

npm install @daily-co/daily-js

Then in your application code:

// webpack/node-style require
//
const DailyIframe = require('@daily-co/daily-js');
let callFrame = DailyIframe.wrap(MY_IFRAME);

// or, cutting-edge, super-whizzy import
//
import DailyIframe from '@daily-co/daily-js';
let callFrame = DailyIframe.wrap(MY_IFRAME);

The DailyIframe class

This main entry point for this library's functionality is the DailyIframe class.

The class exposes methods and events for managing the call lifecycle, managing participant state, and customizing video element layout and styling.

Methods

  • factory methods
    • createFrame(parentEl, properties)
    • wrap(iframe, properties)
    • createTransparentFrame(properties)
  • instance methods
    • join(properties)
    • leave()
    • startScreenShare()
    • stopScreenShare()
    • iframe()
    • meetingState()
    • participants()
    • updateParticipant(sessionId, properties)
    • loadCss({ bodyClass, cssText, cssFile })
    • updateParticipants(propertiesObject)
    • localAudio()
    • localVideo()
    • setLocalAudio()
    • setLocalVideo()
    • sendAppMessage()
    • setBandwidth({ kbs, trackConstraints })
    • getNetworkStats()
    • setShowNamesMode(mode)
    • startRecording()
    • stopRecording()
    • cycleCamera()
    • getInputDevices()
    • setInputDevices()
    • setOutputDevice()
    • addFakeParticipant({ aspectRatio })
    • on(eventName, callback)
    • once(eventName, callback)
    • off(eventName, callback)

Factory methods and top-level configuration

You don't ever need to call the DailyIframe constructor directly. Instead, use one of the factory methods, createFrame(), wrap() or createTransparentFrame().

The factory methods accept a properties object. (You can also set these properties when you call the load or join() methods.)

// top-level configuration properties. can be passed to the factory
// method that creates the DailyIframe object, or to the join()
// method.
{
  url: <required: url of the meeting to join>
  token: <optional: meeting join token>
  iframeStyle: <optional: used only by `createFrame()`>
  customLayout: <optional: use a custom in-call UI>
  cssFile: <optional: for a custom UI, an external css stylesheet to load>
  cssText: <optional: for a custom UI, an inline css style text to load>
  bodyClass: <optional: for a custom UI, class attributes to apply to the iframe body element>
}

createFrame(parentEl, properties)

Use this method to create a call iframe element and insert it into the DOM.

Both arguments are optional. If you provide a parentEl, the new iframe will be appended as a child of that element. Otherwise, the new iframe will be appended as a child of document.body.

The second argument is the properties object defined above. If you don't set at least the url property here, you'll need to set it later when you call the join() or load() method.

You can set the css properties of the new iframe by passing a javascript-style css properties hash in the iframeStyle property. For example:

// for a full-page video call with the standard Daily.co UI
//
callFrame = window.DailyIframe.createFrame({
  iframeStyle: {
    position: 'fixed',
    width: '100%',
    height: '100%'
  }
});

The default iframeStyle (styles applied to the iframe if you don't supply any) depend on whether the new iframe is a child of document.body or not. If the new iframe is a child of document.body, the defaults position the iframe as a floating window in the bottom right of the page. If, on the other hand, you specify a parentEl deeper in the DOM tree, the defaults are to fill the width and height of the parent element.

wrap(iframe, properties)

Use this factory method to wrap an iframe DOM element that you've already defined.

The first argument is the iframe you want to wrap. The second argument is the properties object defined above. A properties argument is optional.

You will need to set allow="microphone; camera; autoplay" on your iframe to be able to turn on the camera and microphone.

createTransparentFrame(properties)

A convenience method that creates a full-page overlay, transparent iframe that ignores all pointer events.

Instance methods reference

join(properties)

Joins a meeting.

Takes the same properties object that the factory methods take. The properties argument is optional, but the meeting url must be set either here or previously.

Returns a promise, which resolves when the join completes. The promise resolves with a participants object. This is the same participants object that is passed to the joined-meeting event. You will often want to do some call setup or UI updating as soon as a meeting is joined. You can do that when the join() promise resolves, or by installing a joined-meeting event listener. The two approaches are pretty much equivalent.

async function joinExample() {
  let participants;
  try {
    participants await callFrame.join();
  } catch (e) {
    console.error('ERROR while joining meeting', e);
    return;
  }
  console.log('local mic is', participants.local.audio ? 'on': 'off');
}

leave()

Leaves the meeting. If there is no meeting, this method does nothing. Returns null;

startScreenShare()

Starts a screen share from the local participant. If there is no meeting, or this is not a browser that supports screen sharing, or enable_screenshare is set to false for either the room or the meeting token, this method does nothing.

There's no way to know if the user ignores or cancels the browser's screen share confirmation dialog.

To confirm that screen sharing started, listen for update-participant events and check the local user's screen property.

Returns null.

stopScreenShare()

Stops a current screen share, if there is one.

Returns null.

iframe()

Returns the iframe DOM element that this object wraps.

meetingState()

Returns the current meeting state.

  • new
  • joining-meeting
  • joined-meeting
  • left-meeting
  • error

If an error is thrown, the meeting state will transition to 'error', not 'left-meeting', even though the meeting connection will also be terminated by the error.

participants()

Returns the current meeting participants. The participants information is an object that looks like this:

{
  local: {
    user_id: "user_123",
    audio: true,
    cam_info: {
      height: 180,
      left: 286,
      top: 16,
      video_height: 720,
      video_width: 1280,
      width: 320,
    },
    video: true,
    screen: false,
    screen_info: {},
    joinedAt: Date(2019-04-30T00:06:16.011Z),
    local: true,
    owner: true,
    session_id: "3c9ba1ea-baab-4876-d501-21a1d49c0902",
    user_name: "A. User Name"
  },
  "e20b7ead-54c3-459e-800a-ca4f21882f2f": {
    user_id: "e20b7ead-54c3-459e-800a-ca4f21882f2f",
    audio: true,
    cam_info: {}
    video: false,
    screen: false,
    screen_info: {}.
    joinedAt: Date(2019-04-30T00:06:32.485Z),
    local: false,
    owner: false,
    session_id: "e20b7ead-54c3-459e-800a-ca4f21882f2f",
    user_name: ""
  }
}

The object keys are 'local' for the local participant and the participant's session_id for remote participants.

Participant properties are as follows:

  • session_id - a unique id generated each time a participant joins a meeting
  • user_id - the user's id if set by a meeting token, otherwise the session_id
  • user_name - the user's name if set by a meeting token or set from the account if the user is logged into a Daily.co account
  • local - true for the local user
  • owner - true if set by a meeting token or the user is logged into a Daily.co account and is a member of the room's team
  • joined_at - js Date object, the time that the user joined the room
  • audio - true if the user's mic is active
  • video - true if the user's camera is active
  • screen - true if the user is screen sharing
  • cam_info - properties of the participant's video element. top, left, width and height are the video element's global position as returned by the getBoundingClientRect() DOM method. video_width and video_height are the current width and height of the live video stream. video_width and video_height can change as network conditions change. If there is no current camera stream, this will be an empty object.
  • screen_info - properties of the participant's screen video element. This has the same properties as cam_info.

updateParticipant(sessionId, config)

Modify a participant, either by sending a message to change its state, or by changing the local view.

Returns this.

The first argument is the participant's session_id, or 'local' for the local participant.

The second argument is a set of actions to take.

Actions:

  • setAudio: true | false,
  • setVideo: true | false,
  • eject: true
  • styles: custom layout (see below)

setAudio, setVideo, and eject on remote participants require meeting owner permission. If an action is not possible (or if there is no current meeting) the action will be silently ignored.

Please note that remotely controlling a user's microphone and camera is a potential privacy issue. This functionality is important for some use cases, but should not be a general feature of video call user interfaces. Think carefully before you enable remote control of cameras and microphones. And be aware that browsers will require that a user explicitly allow mic/camera device access at least once. Chrome will prompt the first time a user joins a call on a specific subdomain. Safari will prompt once each meeting session.

The styles action is only used if you are implementing your own custom in-call video layout. The format of the styles property is:

styles: {
  cam: {
    div: { ...css properties }
    overlay: { ...css properties }
    video: { ...css properties }
  },
  screen: {
    div: { ...css properties }
    overlay: { ...css properties }
    video: { ...css properties }
  }
}

The styles.cam.div style css properties are applied to the container div for the participant's camera stream. The style.cam.overlay style css properties are applied to the overlay element for the participant's camera stream. The styles.cam.video css properties are applied to the video element for the participant's camera stream. The styles.screen.div and styles.screen.video are applied to the container and video element for the participant's screen share feed.

For example, to position the local camera feed and make it visible, you only need to set a few css properties of the local participant's styles.cam.div. Here's how you might "shadow" the position and size of a placeholder div you've created:

let bounds = localVidPositioningEl.getBoundingClientRect();
callFrame.updateParticipant('local', {
  styles: {
    cam: {
      div: {
        visibility: 'visible',
        top: bounds.top,
        left: bounds.left,
        width: bounds.width,
        height: bounds.height
      }
    }
  }
});

See the next section, about the loadCss() method, for more information about implementing custom layouts.

loadCss({ bodyClass, cssFile, cssText })

You can call this function any time to (re-)set the body classes and CSS that you've passed into the iframe.

These three styling properties are used to implement completely custom layouts. They are ignored unless you have constructed the DailyIframe object using the createTransparentFrame() factory function.

The three styling properties can be passed to the factory function, to the join() method, or to this loadCss() method.

See the demo/layout-css.html and demo/layout-css.css files for an example of a custom layout with several dynamic options, implemented entirely in css.

The bodyClass property is a string. The class attribute of the body element inside the call iframe will be set to this string. You can include multiple class names in the string. (Just separate the class names with spaces.)

callFrame.loadCss({ bodyClass: 'theme-bubbles minimized-view' });

The cssFile property is the url of a stylesheet to fetch externally. The url can be an absolute url, or a relative url. If it's relative, the url will be resolved relative to the parent iframe.

Each call to loadCss() will replace the previous cssFile stylesheet, if a cssFile property is passed to the method. (It can sometimes be useful to switch stylesheets in the middle of a call.) To remove the previous stylesheet, pass an empty string ('') as the cssFile property.

 callFrame.loadCss({ cssFile: '/static/call-theme-bubbles.css' });

The cssText property is a string of css to load into the iframe inside a <style> element.

Each call to loadCss() will replace the previous cssText style element, if a cssText property is passed to the method.

// a very simple custom layout:
// this css will display every participant's
// video streams in a column down the right side
// of the window
//
callFrame.loadCss({ cssText: `
  .daily-video-div {
    position: relative;
    visibility: visible;
    width: 320;
    height: 180;
    margin: 1em;
    margin-left: auto;
  }
`});

The loadCss() method returns this.

CSS for custom layouts

Each available video stream in the video call iframe is wrapped in a div, and has a sibling element that is a div you can use as an overlay. You can style the video container, the overlay, and the video element. You can also style a separate top level div, a div that wraps all of the video elements, and an info div.

Here is the DOM structure of the elements in a call that you can style.

<body class=" (bodyClass classes...) ">
  <div class="daily-video-toplevel-div (toplevel classes...)
       style=" (toplevel style variables...) ">

    <div class="daily-videos-wrapper (call-state classes)">

      <div class="daily-video-div (video classes...)"
           style=" --aspect-ratio:(aspect ratio) (participant div styles...) "
           data-user-name=" (user_name) "
           data-user-id=" (user_id) ">
        <div class="daily-video-overlay (video classes...)"
             style=" --aspect-ratio:(aspect ratio) (participant overlay styles...) "
             data-user-name=" (user_name) "
             data-user-id=" (user_id) ">
        <video class="daily-video-element (video classes...)">
               style=" --aspect-ratio:(aspect ratio) (participant video styles...) "
               data-user-name=" (user_name) "
               data-user-id=" (user_id) ">
      </div>
      ... additional video elements

    </div>

    <div class="info-div"></div>
  </div>
</body>

Here are the default styles for the container and video element classes.

.daily-video-toplevel-div {
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
}
.daily-videos-wrapper {
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
}
.daily-video-div {
  position: fixed;
  visibility: hidden;
}
.daily-video-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}
.daily-video-element {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.daily-video-element.local.cam {
  transform: scale(-1,1);
}

As you can see above, the visibility of the .daily-video-div container elements is set to hidden initially. This means that until you override the default styles, no video streams are displayed.

Note that all available audio is always played. Even when a participant's video stream is hidden, that participant's audio is audible.

The local video element (the user's own camera view) is flipped horizontally. This is the norm in video conferencing user interfaces.

Lists of classes that depend on call and participant state are attached to the various elements listed above.

Additional classes of .daily-video-toplevel-div:
  • recording: the call is being recorded
  • recording-uploading: the recording is being done locally and saved to the cloud, and uploading to the cloud is in progress. This should always be true during a local cloud recording, and will stay true until the upload completes, even after the recording is stopped.
Additional classes of .daily-videos-wrapper:
  • local-cam-on: the local camera is turned on
  • local-cam-muted: the local camera is unavailable, blocked, or muted
  • local-screen: a local screen share is in progress
  • remote-cams-N: there are N remote video participants in the call. This counts all video participants, even those that have no camera or have muted their camera. It does not count dial-in participants.
  • remote-cams-on-N: there are N remote cameras turned on
  • remote-cams-muted-N: there are N remote cameras unavailable or muted
  • remote-screens-N: there are N remote screen shares in progress
Additional classes and styles of .daily-video-div,

.daily-video-overlay, and .daily-video-element

The same set of additional classes is set for each "bundle" of these DOM elements.

  • local: this is video from the local participant
  • remote: this is video from a remote participant
  • cam: this is camera video
  • screen: this is screen sharing video
  • cam-on: the camera for this participant is turned on and streaming
  • cam-muted: the camera for this participant is unavailable, blocked, or muted
  • mic-on: the mic for this participant is turned on and streaming
  • mic-muted: the mic for this participant is unavailable, blocked, or muted

Per-participant styles set with the updateParticipant() method are applied to each element.

The participant user_name and user_id supplied in HTML data-user-name and data-user-id attributes. This allows the display of usernames in pure css layouts. For example.

.show-names .daily-video-overlay::after {
  font-family: 'Lato', sans-serif;
  font-weight: bold;
  content: attr(data-user-name);
  position: absolute;
  padding: 0.65em;
  bottom: 0.25em;
  left: 0.25em;
}

The video stream aspect ratio is supplied as a css variable. This can be helpful in dynamic/responsive sizing, as it's difficult with css-only approaches to preserve video aspect ratio while also precisely sizing container and overlay elements. For example, here is css for sizing all video streams to 320 pixels wide, with height flexible depending on each video's aspect ratio.

.daily-video-div {
  width: 320;
  height: calc(320px / var(--aspect-ratio));
}

For example CSS-driven layouts, see the /demo directory.

updateParticipants(propertiesObject)

Syntactic sugar for updating multiple participants with a single call. The propertiesObject's keys are participant session ids and values are the properties objects described above. Internally, this method just loops over the keys and calls updateParticipant() multiple times.

Returns this.

localAudio()

Returns the local mic state or null if not in a call. Syntactic sugar for this.participants.local.audio.

localVideo()

Returns the local camera state or null if not in a call. Syntactic sugar for this.participants.local.video.

setLocalAudio(bool)

Updates the local mic state. Does nothing if not in a call. Syntactic sugar for this.updateParticipant('local', { audio: bool }).

Returns this.

sendAppMessage(data, to)

Sends a message to other participants in the call. data should be a javascript object that can be serialized into JSON. to should be either a participant session_id, or "*". The "*" value is the default, and means that the message is a "broadcast" message intended for all participants.

You can listen for these messages by installing a handler for the app-message event.

Messages are delivered to participants currently in the call. They are not stored. If a recipient is not in the call when the message is sent, the recipient will never receive the message.

Note that the to address is the session_id, not the user_id.

Broadcast messages are not delivered to the sender of the message.

Returns this.

setLocalVideo(bool)

Updates the local camera state. Does nothing if not in a call. Syntactic sugar for this.updateParticipant('local', { video: bool }).

Returns this.

setBandwidth({ kbs, trackConstraints })

Experimental method: Sets a cap on the combined upstream video bandwidth used for WebRTC peer connections. This API may change in the future.

In general we try to hide all the complexity of WebRTC so that you can focus on your own application rather than the details of audio and video network streams! We do bandwidth management, for example, that is "the right thing" for most use cases (based on lots of empirical call data, plus experience working around cross-platform quirks).

But sometimes you might need to reach down through the abstraction boundary to do specialized things. We want to make that possible, too. This method is an experiment in that direction. Please let us know if you're using it, and whether it helps you, and what other functionality you need for your applications.

The kbs property is a soft cap on the upstream video bandwidth used for each peer connection. Currently this is implemented by setting b=AS for each local participant SDP m=video section. This mechanic may change in the future, though, as browsers evolve.

Note that the kbs cap does not take into account audio bandwidth. We don't currently support customizing audio bandwidth settings.

The trackConstraints property is a MediaTrackConstraints dictionary that will be applied to the local video track, if possible. Browser support for the MediaStreamTrack.applyConstraints() is still a work in progress. But support is improving rapidly.

Here's an example of using setBandwidth() to transmit 64x64 images at a target video bandwidth cap of 32 kilobits per second.

callFrame.setBandwidth({
  kbs: 32,
  trackConstraints: { width: 64, height: 64 }
});

This method will be extended to support simulcast soon.

Returns this.

getNetworkStats()

Returns a Promise that resolves with an array of network statistics.

{
  stats: {
    latest: {
      timestamp: 1558918282005
      videoRecvBitsPerSecond: 648973
      videoRecvPacketLoss: 0
      videoRecvStreamCount: 1
      videoSendBitsPerSecond: 656493
      videoSendPacketLoss: 0
      videoSendStreamCount: 1
    }
    worstVideoRecvPacketLoss: 0
    worstVideoSendPacketLoss: 0
  }
}

setShowNamesMode(mode)

Determines whether user names are shown overlaying the video elements in the standard Daily.co call user interface. Has no effect on custom UIs.

The mode argument must be one of "always", "never", or null. null is the default UI behavior: names are shown when a user is muted or the chat panel is open.

Returns this.

startRecording()

Starts a recording if recording is enabled for the room/participant. Has no effect if recording is not enabled.

stopRecording()

Stops a recording if the participant is currently recording. Has no effect if there's no current recording.

cycleCamera()

Switches the local camera stream to use the next available camera device. Has no effect if there is only one camera.

Returns a Promise that resolves with data about the camera device. (The data is copied from the camera's MediaDeviceInfo struct.)

enumerateDevices()

This is a wrapper around navigator.mediaDevices.enumerateDevices().

Returns a promise that resolves with a list of available video input devices, and audio input and output devices.

getInputDevices()

Returns a Promise that resolves to return data about the camera and mic devices that are currently being used. The data is copied from the MediaDeviceInfo struct for each device.

setInputDevices({ audioDeviceId, videoDeviceId })

Switch to using a specific local audio device, video device, or both. Takes device id arguments that match ids returned by enumerateDevices().

setOutputDevice({ outputDeviceId })

Sets the output output device. Takes a device id argument that matches ids returned by enumerateDevices().

Browser support for this API varies. Safari does not support setting an audio output device, for example. (Apple users need to set audio output at the OS level.)

addFakeParticipant({ aspectRatio })

Add a fake video stream to the call, to help with implementing custom layouts. Has no effect unless you are using a custom layout.

The aspectRatio argument defaults to 16/9. Other supported aspect ratios are 3/4 and 4/3.

Returns this.

`on(eventName, callback) once(eventName, callback)

off(eventName, callback)`

Adds and removes event callbacks. See documentation for EventEmitter.

Events

DailyIframe implements the EventEmitter interface.

You can install callbacks for the following events:

  • loading
  • loaded
  • started-camera
  • camera-error
  • joining-meeting
  • joined-meeting
  • left-meeting
  • participant-joined
  • participant-updated
  • participant-left
  • recording-started
  • recording-stopped
  • recording-stats
  • recording-error
  • recording-upload-completed
  • app-message
  • click
  • mousedown
  • mouseup
  • mouseover
  • mousemove
  • touchstart
  • touchmove
  • touchend
  • error

The on(), once(), and off() methods add and remove callbacks. All of these methods return the this object, so that it's easy to chain calls.

// example of using on() to add event callbacks
//
callFrame.on('joining-meeting', (evt) => { 
               console.log('joining-meeting event', evt);
               showSpinner();
            })
         .on('joined-meeting', (evt) => {
               console.lg('joined-meeting event', evt);
               callFrame.iframe().style.visibility = 'visible';
            });

The event object passed to the callbacks always includes an action property with the event's name, so that your callback functions can handle multiple event types.

events reference

joining-meeting

Emitted when the join() method is called, while the call is loading and connecting.

// example event object
{ action: 'joining-meeting' }

joined-meeting

Emitted when the call has connected. The participants property lists the current participants in the call. See the participants() method above for a description of the participant object.

// example event object
{
  action: 'joined-meeting',
  participants: {
    local: {
      audio: true,
      cam_info: {
        height: 180,
        left: 286,
        top: 16,
        video_height: 720,
        video_width: 1280,
        width: 320,
      },
      joinedAt: Date(Mon Apr 29 2019 15:18:20 GMT-0700),
      local: true,
      owner: true,
      screen: false,
      screen_info: {},
      session_id: '42fb115a-6d42-4155-ae4f-c96629f5217d',
      user_id: 'f26added-7821-49fc-9cb1-f9e22924b2c4',
      user_name: "kwindla-desktop",
      video: true
    }
  }
}

left-meeting

Emitted when the call disconnects.

// example event object
{ action: 'left-meeting' }

participant-joined

Emitted when a new participant joins the call. The event's participant property contains all available information about the participant.

Please note that this event may arrive for a remote participant before the participant-joined event, because remote participant data can become available before audio and video streams are ready.

// example event object
{
  action: 'participant-joined',
  participant: {
    audio: false,
    cam_info: {},
    joinedAt: Date(Mon Apr 29 2019 15:29:20 GMT-0700),
    local: false,
    owner: false,
    screen: false,
    screen_info: {},
    session_id: '049ebba2-523b-4e6c-9a9f-1f8bb956670d',
    user_id: '049ebba2-523b-4e6c-9a9f-1f8bb956670d',
    user_name: '',
    video: false,
  }
}

participant-updated

Emitted when participant state changes. This event is fired for both local and remote participant state changes. The event's participant property contains all available information about the participant.

// example event object
{
  action: 'participant-updated'
  participant: { ... }
}

participant-left

Emitted when a remote participant state leaves the call. The event's participant property contains all of the available information about the participant just before the participant disconnected.

// example event object
{
  action: 'participant-left'
  participant: { ... }
}

click, mousedown, mouseup, mouseover, mousemove, touchstart, touchmove, touchend

Emitted when corresponding input event fires for a participant video.

// example event object
{
  action: 'click',
  event: {
    type: 'click'
    altKey: false
    button: 0
    ctrlKey: false
    metaKey: false
    offsetX: 40
    offsetY: 46
    pageX: 134
    pageY: 46
    screenX: 2706
    screenY: 298
    shiftKey: false
    x: 134
    y: 46
  },
  participant: <participant object>
}

error

Emitted when an unrecoverable call error is encountered. The event's errorMsg property will contain a string with additional information.

If a call is in progress when the error is thrown, a left-meeting event should be emitted immediately after the error event.

// example event object
{
  action: 'error',
  errorMsg: 'network unreachable'
}
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