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@pactor-app/expression

v1.20.0

Published

Pactor expression: controlled AST expression engine (no eval, no global access)

Readme

@pactor-app/expression

Pactor 的受控表达式引擎:解析与求值 DSL 中的 ${...} 表达式。基于受控 AST —— 不使用 eval / new Function,无法访问全局对象

安装

npm install @pactor-app/expression
# 或
pnpm add @pactor-app/expression

示例

import { evaluateExpression, resolveTemplate } from '@pactor-app/expression';

const scope = { state: { count: 42, status: 'ACTIVE' } };

// 模板:整体为单个表达式时保留原始类型
resolveTemplate('${state.count}', scope); // 42(number)
resolveTemplate('共 ${state.count} 条', scope); // "共 42 条"

// 表达式求值
evaluateExpression("state.status == 'ACTIVE' && state.count > 0", scope); // true

// 白名单函数
evaluateExpression("!permission('customer:edit')", scope, {
  functions: { permission: (code) => code === 'customer:edit' },
}); // false

安全约束:

  • 仅支持白名单 AST 节点(字面量 / 标识符 / 成员访问 / 二元 / 逻辑 / 一元 / 三元 / 白名单函数调用 / 对象字面量)
  • 赋值、new、箭头函数、数组字面量、obj.method() 等在 parse 阶段直接抛错
  • 标识符仅从调用方传入的作用域解析,window / fetch 等全局对象不可达
  • __proto__ / prototype / constructor 键被隔离

文档

完整文档见 https://github.com/426-330/pactor/tree/main/docspnpm docs:dev 本地启动文档站)。

License

MIT