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+---
+RFC: RFCnnnn
+Author: Kirk Munro
+Status: Draft
+SupercededBy: 
+Version: 0.1
+Area: Engine
+Comments Due: September 15, 2019
+Plan to implement: Yes
+---
+
+# Execution preferences must persist beyond module or script scope
+
+PowerShell has a long-standing issue where execution preferences such as those
+defined by the `-ErrorAction`, `-WarningAction`, `-InformationAction`,
+`-Debug`, `-Verbose`, `-WhatIf` and `-Confirm` common parameters, or those
+defined by any of the `$*Preference` variables, do not persist from one module
+to another module or script, nor do they persist from a script to another
+module or script. This is a result of how modules and scripts are scoped within
+PowerShell. It impacts modules written by Microsoft as well as scripts and
+modules written by the community, and it is often identified as a bug when it
+shows up in various places. You can see some of the discussion around this in
+[PowerShell/PowerShell#4568](https://github.com/PowerShell/PowerShell/issues/4568).
+
+Regardless of whether you are authoring a script, an advanced function, or a
+cmdlet, you should be able to do so knowing that all execution preferences will
+be carried through the entire invocation of a command, end to end, regardless
+of the implementation details of that command.
+
+Cmdlets already work this way today.
+
+You can invoke cmdlets within a script, or within an advanced function defined
+in a module, and the execution preferences used during the invocation of that
+script or advanced function will be respected by the cmdlets that are invoked.
+This RFC is about making it possible for scripts or advanced functions to work
+that way as well.
+
+It is important to note that the only way to implement this feature such that
+it is not a breaking change is by making it
+[optional](https://github.com/PowerShell/PowerShell-RFC/pull/220); however,
+even with it optional, it can be enabled by default for new modules to correct
+this problem going forward (using `$PSDefaultParameterValues`), and since it is
+optional, existing scripts and modules could be updated to support it as well,
+when they are ready to take on the responsibility of testing that out. That
+would allow this feature to be adopted more easily for new modules, while
+existing modules could be updated over time.
+
+## Motivation
+
+As a scripter or a command author,<br/>
+I should never have to care what type of command (cmdlet vs advanced function)
+I am invoking,<br/>
+so that I can can focus on my script without having to worry about the
+implementation details of commands I use.
+
+As a command author,<br/>
+I should be able to change a published command from an advanced function to a
+cmdlet or vice versa,<br/>
+so that as long as I keep the same functionality in the command, scripts and
+modules where that command is in use should behave the same way.
+
+## User experience
+
+```powershell
+# First, create a folder for a new module
+$moduleName = 'RFCPropagateExecPrefDemo'
+$modulePath = Join-Path `
+    -Path $([Environment]::GetFolderPath('MyDocuments')) `
+    -ChildPath PowerShell/Modules/${moduleName}
+New-Item -Path $modulePath -ItemType Directory -Force > $null
+
+# Then, create the manifest, with the PersistCommandExecutionPreferences optional
+# enabled by default, to correct the behaviour in a non-breaking way; downlevel
+# versions of PowerShell would ignore the optional feature flags)
+$nmmParameters = @{
+    Path = "${modulePath}/${moduleName}.psd1"
+    RootModule = "./${moduleName}.psm1"
+    FunctionsToExport = @('Test-1')
+    OptionalFeatures = @('PersistCommandExecutionPreferences')
+    PassThru = $true
+}
+New-ModuleManifest @nmmParameters | Get-Content
+
+# Output:
+#
+# @{
+#
+# RootModule = './RFCPropagateExecPrefDemo.psm1'
+#
+# # Private data to pass to the module specified in RootModule/ModuleToProcess.
+# # This may also contain a PSData hashtable with additional module metadata
+# # used by PowerShell.
+# PrivateData = @{
+#
+#     <snip>
+#
+#     PSData = @{
+#
+#         # Optional features enabled in this module.
+#         OptionalFeatures = @(
+#             'PersistCommandExecutionPreferences'
+#         )
+#
+#         <snip>
+#
+#     } # End of PSData hashtable
+#
+#     <snip>
+#
+# } # End of PrivateData hashtable
+#
+# }
+
+# Then, create the script module file, along with a second module in memory
+# that it invokes, and import both modules
+$scriptModulePath = Join-Path -Path $modulePath -ChildPath ${moduleName}.psm1
+New-Item -Path $scriptModulePath -ItemType File | Set-Content -Encoding UTF8 -Value @'
+    function Test-1 {
+        [cmdletBinding()]
+        param()
+        Test-2
+    }
+'@
+Import-Module $moduleName
+New-Module Name test2 {
+    function Test-2 {
+        [cmdletBinding()]
+        param()
+        Write-Verbose 'Verbose output'
+    }
+} | Import-Module
+
+# When invoking the Test-2 command with -Verbose, it shows verbose output,
+# as expected.
+Test-2 -Verbose
+
+# Output:
+#
+# VERBOSE: Verbose output
+
+# Thanks to this feature, when invoking the Test-1 command with -Verbose, it
+# also shows verbose output. In PowerShell 6.2 and earlier, no verbose output
+# would appear as a result of this command due to the issue preventing
+# execution preferences from propagating beyond module/script scope.
+Test-1 -Verbose
+
+# Output:
+#
+# VERBOSE: Verbose output
+```
+
+## Specification
+
+To resolve this problem, a new optional feature called
+`PersistCommandExecutionPreferences` would be defined in PowerShell. When this
+optional feature is enabled, it would change how common parameters are passed
+from one advanced function to another advanced function or a script that uses
+`CmdletBinding`.
+
+Today if you invoke a script or advanced function with `-ErrorAction`,
+`-WarningAction`, `-InformationAction`, `-Debug`, `-Verbose`, `-WhatIf`, or
+`-Confirm`, the corresponding `$*Preference` variable will be set within the
+scope of that command. That behaviour will remain the same; however when the
+optional feature is enabled, in addition to that behaviour, the names and
+values you supplied to those common parameters stored in a new
+`ExecutionPreferences` dictionary property of the `$PSCmdlet` instance. Once
+`$PSCmdlet.ExecutionPreferences` is set, any common parameters that are stored
+in `$PSCmdlet.ExecutionPreferences` that are not explicitly used in the
+invocation of another command within that command scope will be automatically
+passed through if the command being invoked supports common parameters.
+
+It is important to note that parameter/value pairs in
+`$PSCmdlet.ExecutionPreferences`, which represent command execution
+preferences, would take priority and be applied to a command invocation before
+values in `$PSDefaultParameterValues`, which represents user/module author
+parameter preferences (i.e. if both dictionaries have a value to be applied to
+a common parameter, only the value in `$PSCmdlet.ExecutionPreferences` would be
+applied).
+
+As per the optional feature specification, the optional feature can be enabled
+in a module manifest (see example above), or a script file via `#requires`. For
+more details on how that works, see #220.
+
+## Alternate proposals and considerations
+
+### Rip off the bandaid
+
+[Some members of the community](https://github.com/PowerShell/PowerShell/issues/6745#issuecomment-499740080)
+feel it would better to break compatibility here. On the plus side, not having
+to deal with this an an optional parameter would be ideal; however, to increase
+adoption of PowerShell 7, it would be better to make the transition from
+PowerShell 5.1 into 7 easier by having as few breaking changes as possible.
+
+One way to achieve this while supporting users who don't want the breaking
+change would be to inverse the optional feature, where the breaking change is
+in place and users opt out of the breaking change instead of opting into it.
+Another way would be to change the optional feature design such that users can
+turn them off in scripts/modules if those scripts/modules are not ready to use
+the breaking change. See the alternate proposals and considerations section of
+#220 for more information.
+
+### Support `-DebugAction`, `-VerboseAction`, and `-ProgressAction` if those common parameters are added
+
+[PowerShell/PowerShell#10238](https://github.com/PowerShell/PowerShell/pull/10238)
+will add `-DebugAction`, `-VerboseAction`, and `-ProgressAction` common
+parameters to PowerShell if it is merged. These common parameters would also
+need to propagate properly with `-ErrorAction`, `-WarningAction`, and
+`-InformationAction`.