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Release Cyclopes npm Gitter Go Report Card


Cyclopes is lightweight CLI tool to help us perform simple visual testing tasks, so we can feel more confident shipping our code.

Visual testing with Cyclopes includes screenshotting our desired pages, but also sending the results to the tools we use (like Slack) so we can make a quick review.

Some useful use cases:

  1. Visual test your GatsbyJS/NextJS etc. marketing websites. If you are not writing tests (which is often the case with marketing websites), you can use cyclopes to check if your website is rendered as expected.

  2. Integrate visual testing with your CI, and send generated screeenshots to a dev Slack channel. The screenshots can be taken from Cypress.js or any other E2E testing framework you already use.

Cyclopes is only using Chrome to test as it is based in chromedp.

💡 Cyclopes is not Visual Testing as a Service (Percy, Chromatic etc), but something to bridge the gap between not having a visual test, and having a complicated setup to work with.


With npm or yarn

# npm
npm install cyclopes

# yarn
yarn add cyclopes

With go get

go get -u

Or you can download the binaries directly from Github releases.

How to use

The usage is fairly simple. You can run


which will try to find the default yaml file cyclops.yml in the current directory.

If you want to use a different file name, you can use

cyclopes --config your-config.yml # or --config=./your-config.yml, the first provides better path auto-completion

How to configure

The configuration (yaml) file will start with two root steps, the visual and adapters, both which are optional. Below is an example of a yaml configuration file and below a table with the values and their possible options.

💡 Easily create a configuration file by running cyclopes --generate

# Directory where the images will be saved
# and/or retrieved from the channel adapters
imagesDir: "./images"

# If visual is defined, it will be the first step
# where the pages defined will be visited and screenshotted
# one by one with the defined order
  # (Optional): URL to visit. If this field does
  # not exist, builDir is required
  # Directory to serve for testing.
  # Required only if remoteURL is missing
  buildDir: "./public"
  # If the testing session will be headless or not
  # for debugging purposes
  headless: true
  # Pages to visit and screenshot
    # Path of the page
    - path: "/"
      # Type of device to screenshot
      device: "both"
      # Delay after the page is loaded
      delay: 2000
      # Wait for an element to appear
      waitSelector: "#NeoCybotCookiebotDialogBodyButtonAccept"
      # If the screenshot should be fullpage or viewport
      screenshot: "fullpage"
      # Code to be executed inside the webpage
      # This can help to remove Cookies banner for example
      code: |
        const cookiesButton = document.querySelector("#NeoCybotCookiebotDialogBodyButtonAccept")
        if (cookiesButton) {
    - path: "/product"
      device: "mobile"
      screenshot: "fullpage"
    - path: "/product/graph-data-science/"
      device: "desktop"
# Adapters
# Each adapter will have it's own parameters
    OAUTH_TOKEN: example-token
    CHANNEL_ID: example-token

Useful Parameters

parameter values default value required description
imagesDir string null yes The path where the images will be saved or retrieved from the adapters
headless bool true no If our visual testing session will open the chrome browser in headless mode
device desktop, mobile, both both no Viewport of device we should screenshot
screenshot fullpage, viewport fullpage no Screenshotting the current viewport or fullpage screenshot
code string no Javascript code to execute inside page. It can be a Promise that will be waited to be fulfilled

🔌 Adapters

Right now only Slack adapter is supported.

Soon more will be added like Trello etc. Any recommendation is welcome.

Slack adapter

  oauth_token: example-token
  channel_id: example-channel-id

or as environment variables

export ADAPTERS_SLACK_CHANNEL_ID=example-channel-id
export ADAPTERS_SLACK_OAUTH_TOKEN=example-token

Trello adapter

  key: example-key
  token: example-token
  # check this from the URL
  # Example<board-id>
  board_id: example-board-id
  # Find it inside:<board-id>.json
  list_id: example-list-id
  # Will only append existing labels based on the name of the label
  labels: ["existing label 1", "existing label 2"]

or as environment variables

export ADAPTERS_TRELLO_KEY=example-example-key
export ADAPTERS_TRELLO_TOKEN=example-example-token
export ADAPTERS_TRELLO_BOARD_ID=example-board-id
export ADAPTERS_TRELLO_LIST_ID=example-list-id

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npm i cyclopes

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  • konsalex