code: function withDefinition(property, definitionMap, options) {
    const definition = definitionMap[property];
    if (definition) {
      return options.fn(definition);
    }
    return options.inverse(this);
  }
docs: Process the primary block if the specified property has a
  schema/$ref linkage, and the inverse block if not.
  @param {object}      property      - Property to check
  @param {object}      definitionMap - Definitions map
  @param {object}      options       - Handlebars options.
  @returns {string}                  - Handlebars output