@angular-devkit/schematics-cli/schematic/files/src/my-full-schematic/schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema",
  "$id": "MyFullSchematicsSchema",
  "title": "My Full Schematics Schema",
  "type": "object",
  "properties": {
    "index": {
      "type": "number",
      "default": 1
    },
    "name": {
      "type": "string"
    }
  },
  "required": ["name"]
}