Global variables are erroneously reported as "never used"

System Details Output

### VSCode version: 1.36.1 2213894ea0415ee8c85c5eea0d0ff81ecc191529 x64

### VSCode extensions:
bierner.lit-html@1.11.0
mikeburgh.xml-format@1.0.2
MS-CEINTL.vscode-language-pack-de@1.36.2
ms-vscode.powershell@2019.5.0
msjsdiag.debugger-for-chrome@4.11.6
slevesque.vscode-hexdump@1.7.2


### PSES version:

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      5.1.16299.1146
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.16299.1146
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Issue Description

PowerShell extension reports global variables as assigned but not used when they are not used from within a .psm1 module file. However, global variables may be used by scripts outside that module importing it.

Expected Behaviour

Global variables should never be reported as being unused.

Actual Behaviour

PowerShell extension reports global variables as assigned but not used when they are not used from within a .psm1 module file.

未指定源文件、测试或入口点。首先定位用于报告已赋值但未使用变量的分析器逻辑，以及覆盖模块或全局变量作用域的测试。确认当前行为，然后更新相关测试预期，使全局变量不会被报告为未使用，并运行受影响的分析器测试。