Warn on Undeclared Variable

There is currently a rule that warns when I have assigned a variable but haven't called it (UseDeclaredVarsMoreThanAssignments), however, there doesn't appear to be a rule that warns me if I have used a variable that hasn't been assigned.

Is this a possibility? I can definitely see there would be some challenges around implementing it correctly, but this would be a useful warning.

首先阅读现有的 UseDeclaredVarsMoreThanAssignments 规则及其周围的 PSScriptAnalyzer 规则实现，以了解变量使用是如何分析的。确定对在赋值前使用的变量应如何处理，然后定义覆盖受支持情况的测试。当分析器报告未声明变量的使用，且不会错误地标记有效脚本时，即表示完成。