Dot-sourcing functions from file to global scope inside of function

Question

I want to import external function from file, not converting it to a module (we have hundreds of file-per-function, so treat all them as modules is overkill).

Here is code explanation. Please notice that I have some additional logic in Import-Function like adding scripts root folder and to check file existence and throw special error, to avoid this code duplication in each script which requires that kind of import.

C:\Repository\Foo.ps1:

Function Foo {
    Write-Host 'Hello world!'
}

C:\InvocationTest.ps1:

# Wrapper func
Function Import-Function ($Name) {
    # Checks and exception throwing are omitted
    . "C:\Repository\$name.ps1"

    # Foo function can be invoked in this scope
}

# Wrapped import
Import-Function -Name 'Foo'
Foo          # Exception: The term 'Foo' is not recognized

# Direct import
. "C:\Repository\Foo.ps1"
Foo          # 'Hello world!'

Is there any trick, to dot source to global scope?

Answer 1

Just dot-source the function as well:

. Import-Function -Name 'Foo'
Foo # Hello world!

Answer 2

You can change the functions that are defined in the dot-sourced files so that they are defined in the global scope:

function Global:Get-SomeThing {
    # ...
}

When you dot source that from within a function, the function defined in the dot sourced file will be global. Not saying this is best idea, just another possibility.