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0.4.2 • Public • Published

MKC - command line tool for MakeCode editors

This package includes a tool that can compile MakeCode (PXT) projects by downloading parts of a released MakeCode web app and running them in node.js.

This is different than pxt command line tool, which is used primarily during development of MakeCode editors.


In a folder with pxt.json file, run:

> makecode

You can also pass --hw f4, --hw d5 etc. Try --hw help to get a list. Use makecode -j to build JavaScript (it defaults to native).

The tool is configured with optional mkc.json file. Example:

    "targetWebsite": "https://arcade.makecode.com/beta",
    "hwVariant": "samd51",
    "links": {
        "jacdac-services": "../../pxt-jacdac-services"
    "overrides": {
      "testDependencies": {}

All fields are optional.

  • targetWebsite says where to take the compiler from; if you omit it, it will be guessed based on packages used by pxt.json; you can point this to a live or beta version of the editor, as well as to a specific version (including SHA-indexed uploads generated during PXT target builds)
  • hwVariant specifies default hardware variant (currently only used in Arcade); try --hw help command line option to list variants
  • links overrides specific packages; these can be github packages or built-in packages
  • overrides is used to override specific keys in pxt.json

You can use --config-path to build for a different configuration, eg. makecode -c mkc-arcade.json.


  • allow updating shims.d.ts/enums.d.ts
  • add makecode --bump


This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.


npm i makecode

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