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Module-level variable

As explained in Learn PowerShell Scripting in a Month of Lunches, Second Edition: Write and organize scripts and tools

A module-level variable is a variable declared in a PowerShell module outside functions and shared by code in that module.

A module-level variable is declared outside functions and shared by code inside a PowerShell module. It is useful for reusable configuration, such as a database connection string, across several functions. section 26.3

Use module scope deliberately:

  • Export the variable when callers need it; loading the module adds it to the global scope, and unloading removes it. section 26.3
  • Leave helper functions unexported when they support the module internally rather than providing a public command. section 26.3

Connection-string configuration

A disk-information module stores its SQL Server connection string in $DiskInfoSqlConnection. New-DiskInfoSQLTable reuses that value to open the connection and create the diskinfo table when it does not already exist.

How Learn PowerShell Scripting in a Month of Lunches, Second Edition: Write and organize scripts and tools covers it

How deep it goes
Defines scope, export behavior, and module lifecycle, but does not develop broader variable-scope internals.
Examples
Uses a SQL Server connection string shared by disk-information and table-creation commands.
What it assumes
Assumes familiarity with PowerShell functions and modules while demonstrating export behavior through a database example.
What you can do after
Apply it via a PowerShell module to share configuration while controlling which variables and functions become public.
How it connects
Connects module scope with PowerShell modules, functions, global scope, and module exports.
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