gitbook/test/node_modules/gitbook-plugin-test-config/package.json

{
    "name": "gitbook-plugin-test-config",
    "version": "1.0.0",
    "engines": {
        "gitbook": "*"
    },
    "gitbook": {
        "properties": {
            "myProperty": {
                "type": "string",
                "required": true,
                "title": "This is a required property"
            },
            "myDefaultProperty": {
                "type": "string",
                "default": "hello",
                "title": "This is a required property"
            }
        }
    }
}