Graphical User Interface for Clip CC.





GitHub Stars



Last Commit

3d ago








Type Definitions






ClipCC is a powerful scratch-project editor based on clipcc-gui which was created by MIT. And it migrates a lot of function from ClipCC 1.x.

ClipCC's official qq group:959825608





This requires you to have Git and Node.js installed.

In your own node environment/application:

yarn install

If you want to edit/play yourself:

git clone
cd clipcc-gui

Getting started

Running the project requires Node.js to be installed.


Open a Command Prompt or Terminal in the repository and run:

yarn start

Then go to http://localhost:8601/ - the playground outputs the default GUI component

Developing alongside other Scratch repositories

Getting another repo to point to this code

If you wish to develop clipcc-gui alongside other scratch repositories that depend on it, you may wish to have the other repositories use your local clipcc-gui build instead of fetching the current production version of the clipcc-gui that is found by default using yarn install.

Here's how to link your local clipcc-gui code to another project's node_modules/clipcc-gui.


  1. In your local clipcc-gui repository's top level:

    1. Make sure you have run yarn install
    2. Build the dist directory by running BUILD_MODE=dist yarn run build
    3. Establish a link to this repository by running yarn link
  2. From the top level of each repository (such as scratch-www) that depends on clipcc-gui:

    1. Make sure you have run yarn install
    2. Run yarn link clipcc-gui
    3. Build or run the repositoriy

Using yarn run watch

Instead of BUILD_MODE=dist yarn run build, you can use BUILD_MODE=dist yarn run watch instead. This will watch for changes to your clipcc-gui code, and automatically rebuild when there are changes. Sometimes this has been unreliable; if you are having problems, try going back to BUILD_MODE=dist yarn run build until you resolve them.

Oh no! It didn't work!

If you can't get linking to work right, try:

  • Follow the recipe above step by step and don't change the order. It is especially important to run yarn install before yarn link, because installing after the linking will reset the linking.
  • Make sure the repositories are siblings on your machine's file tree, like .../.../MY_SCRATCH_DEV_DIRECTORY/clipcc-gui/ and .../.../MY_SCRATCH_DEV_DIRECTORY/scratch-www/.
  • Consistent node.js version: If you have multiple Terminal tabs or windows open for the different Scratch repositories, make sure to use the same node version in all of them.
  • If nothing else works, unlink the repositories by running yarn unlink in both, and start over.



You may want to review the documentation for Jest and Enzyme as you write your tests.

See jest cli docs for more options.

Running tests

NOTE: If you're a Windows user, please run these scripts in Windows cmd.exe instead of Git Bash/MINGW64.

Before running any test, make sure you have run yarn install from this (clipcc-gui) repository's top level.

Main testing command

To run linter, unit tests, build, and integration tests, all at once:

yarn test

Running unit tests

To run unit tests in isolation:

yarn run test:unit

To run unit tests in watch mode (watches for code changes and continuously runs tests):

yarn run test:unit -- --watch

You can run a single file of integration tests (in this example, the button tests):

$(yarn bin)/jest --runInBand test/unit/components/button.test.jsx

Running integration tests

Integration tests use a headless browser to manipulate the actual HTML and javascript that the repo produces. You will not see this activity (though you can hear it when sounds are played!).

Note that integration tests require you to first create a build that can be loaded in a browser:

yarn run build

Then, you can run all integration tests:

yarn run test:integration

Or, you can run a single file of integration tests (in this example, the backpack tests):

$(yarn bin)/jest --runInBand test/integration/backpack.test.js

If you want to watch the browser as it runs the test, rather than running headless, use:

USE_HEADLESS=no $(yarn bin)/jest --runInBand test/integration/backpack.test.js


Ignoring optional dependencies

When running yarn install, you can get warnings about optionsl dependencies:

npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.2.7

You can suppress them by adding the no-optional switch:

yarn install --no-optional

Further reading: Stack Overflow

Resolving dependencies

When installing for the first time, you can get warnings that need to be resolved:

npm WARN eslint-config-scratch@5.0.0 requires a peer of babel-eslint@^8.0.1 but none was installed.
npm WARN eslint-config-scratch@5.0.0 requires a peer of eslint@^4.0 but none was installed.
npm WARN scratch-paint@0.2.0-prerelease.20190318170811 requires a peer of react-intl-redux@^0.7 but none was installed.
npm WARN scratch-paint@0.2.0-prerelease.20190318170811 requires a peer of react-responsive@^4 but none was installed.

You can check which versions are available:

yarn view react-intl-redux@0.* version

You will need to install the required version:

yarn install  --no-optional --save-dev react-intl-redux@^0.7

The dependency itself might have more missing dependencies, which will show up like this:

user@machine:~/sources/scratch/clipcc-gui (491-translatable-library-objects)$ yarn install  --no-optional --save-dev react-intl-redux@^0.7
clipcc-gui@0.1.0 /media/cuideigin/Linux/sources/scratch/clipcc-gui
├── react-intl-redux@0.7.0
└── UNMET PEER DEPENDENCY react-responsive@5.0.0

You will need to install those as well:

yarn install  --no-optional --save-dev react-responsive@^5.0.0

Further reading: Stack Overflow


If you run into npm install errors, try these steps:

  1. run npm cache clean --force
  2. Delete the node_modules directory
  3. Delete package-lock.json
  4. run npm install again

Publishing to GitHub Pages

You can publish the GUI to so that others on the Internet can view it. Read the wiki for a step-by-step guide.

Want to add more function?

If you want us to add more function in clipcc3, you can add a issue to tell us what kind of function do you like.

Understanding the project state machine

Since so much code throughout scratch-gui depends on the state of the project, which goes through many different phases of loading, displaying and saving, we created a "finite state machine" to make it clear which state it is in at any moment. This is contained in the file src/reducers/project-state.js .

It can be hard to understand the code in src/reducers/project-state.js . There are several types of data and functions used, which relate to each other:

Loading states

These include state constant strings like:

  • NOT_LOADED (the default state),
  • ERROR,
  • etc.


These are names for the action which causes a state change. Some examples are:


How transitions relate to loading states

Like this diagram of the project state machine shows, various transition actions can move us from one loading state to another:

Project state diagram

Note: for clarity, the diagram above excludes states and transitions relating to error handling.


Here's an example of how states transition.

Suppose a user clicks on a project, and the page starts to load with URL .

Here's what will happen in the project state machine:

Project state example

  1. When the app first mounts, the project state is NOT_LOADED.
  2. The SET_PROJECT_ID redux action is dispatched (from src/lib/project-fetcher-hoc.jsx), with projectId set to 123456. This transitions the state from NOT_LOADED to FETCHING_WITH_ID.
  3. The FETCHING_WITH_ID state. In src/lib/project-fetcher-hoc.jsx, the projectId value 123456 is used to request the data for that project from the server.
  4. When the server responds with the data, src/lib/project-fetcher-hoc.jsx dispatches the DONE_FETCHING_WITH_ID action, with projectData set. This transitions the state from FETCHING_WITH_ID to LOADING_VM_WITH_ID.
  5. The LOADING_VM_WITH_ID state. In src/lib/vm-manager-hoc.jsx, we load the projectData into Scratch's virtual machine ("the vm").
  6. When loading is done, src/lib/vm-manager-hoc.jsx dispatches the DONE_LOADING_VM_WITH_ID action. This transitions the state from LOADING_VM_WITH_ID to SHOWING_WITH_ID
  7. The SHOWING_WITH_ID state. Now the project appears normally and is playable and editable.

Contact us

You can contact us by sending an email to We are looking forward to you feedback.

Not now

Rate & Review

Great Documentation0
Easy to Use0
Highly Customizable0
Bleeding Edge0
Responsive Maintainers0
Poor Documentation0
Hard to Use0
Unwelcoming Community0