For AI agents: the complete documentation index is available at /en/llms.txt, the full documentation bundle is available at /en/llms-full.txt, and this page is available as Markdown at /en/reference/sdk/contracts/type-aliases/UiExpression.md.
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      • Type Alias: UiExpression 

      type UiExpression = 
  | {
  value: string | number | boolean | null;
}
  | {
  ref: string;
}
  | {
  op: UiExpressionOperator;
  args: UiExpression[];
};

      Defined in: contracts/ui-document.ts:42

      安全表达式：常量、路径引用或白名单操作。