collection.json

{
  "$schema": "../node_modules/@angular-devkit/schematics/collection-schema.json",
  "schematics": {
    "my-schematics": {
      "description": "A custom module generator.",
      "factory": "./my-schematics/index#mySchematics",
      "schema": "./my-schematics/schema.json"
    }
  }
}