Build Angular Schematics with visual diffs
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Schematics Starter with Sandbox

This repository is a basic Schematic implementation that serves as a starting point to create and publish Schematics to NPM.

More info on this sandbox approach is detailed in this blog post



contains the necessary scripts to build & publish a schematic


example schematic that uses the Angular Component Schematic to generate a new component similar to ng generate component NAME. Also adds a license to each Typescript file with name provided by the CLI prompts. I have an article on CLI prompts here.

Getting started

Yarn is required for the scripts. Make sure it's installed on your machine.

Install the dependencies for the schematic and the sandbox application

yarn && cd sandbox && yarn && cd ..

🖇 Link the schematic in the sandbox to run locally

yarn link:schematic

🏃 Run the schematic

yarn build:clean:launch

To execute an example schematic, make sure you've ran the Install and Link steps above. Then run the following and inspect the changed files.

git checkout component-license && yarn build:clean:launch

E2E testing

Execute the schematic against the sandbox. Then run linting, unit & e2e tests and a prod build in the sandbox.

yarn test

Unit Testing

Run the unit tests using Jasmine as a runner and test framework.

yarn test:unit

Reset the sandbox

Running the schematic locally makes file system changes. The sandbox is version controlled so that viewing a diff of the changes is trivial. After the schematic has run locally, reset the sandbox with the following.

yarn clean

Note: if you're using the schematics CLI mentioned below, you can execute the schematic in a dry run mode.

Change the Schematic name

  1. do a global search and replace for schematic-starter and schematicStarter with the new name.
  2. change the folder name from ./src/schematic-starter/... to ./src/NEW_NAME/...
  3. run yarn link:schematic to set up local package linking for the sandbox

Optional - Testing with the Schematics CLI

To test locally, install @angular-devkit/schematics-cli globally and use the schematics command line tool. That tool acts the same as the generate command of the Angular CLI but also has a debug mode.

Check the documentation with

schematics --help


The publish package.json script is setup to build the schematic. Additional testing scripts could be added to ensure stable releases.

Before publishing:

  • change the package.json name value
  • if using a scope package name (@username/package-name), ensure the following is in your package.json.
    "name": "@username/package-name",
    "publishConfig": {
        "access": "public"