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export type Settings = { enabled: false; } | {
  /**
   * @title Enabled
   * @default false
   */
  enabled: true;
  
  /**
   * @title Some variable
   * @default “some-value”
   */
  some_variable: string;
};

Example with array of item:

interface Item{
  /**
   * @title Name
   * @default ""
   */
  name: string;

  /**
   * @title Code
   * @default ""
   */
  code: string;
}

interface Items extends Array<Item>{}

export type Settings = { enabled: false } | {
  /**
   * @title Enabled
   */
  enabled: true;

  items: Items;
}

Note the conditional type here. In this example an instance of type Settings may have one of 2 interfaces: either enabled field has a value of false, or it is true and then some_variable field is required. When a settings form is rendered that would mean that some_variable field will be hidden, unless enabled field has a value of true (it will be rendered as a checkbox, so the checkbox must be checked).

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