[Preview] Autocomplete doesn't work if parameter type is unknown

Issue Description

I am experiencing a problem with… autocomplete not working some of the time. I was able to pinpoint it to types that are not available for VSCode and it breaks autocomplete totally. In my case ExchangeServiceBase is not there because I am not connected to EWS. But I believe it’s also visible in other cases when types are just not loaded from modules.

This works

function ThisIsMyTest {
    param(
        [string] $Test,
        [string] $Hello
    )
}

ThisIsMyTest

The moment you add another parameter with type that is unknown… whole autocomplete breaks.

function ThisIsMyTest {
    param(
        [string] $Test,
        [string] $Hello,
        [Microsoft.Exchange.WebServices.Data.ExchangeServiceBase] $New
    )
}

ThisIsMyTest

This shows the issue:

VS Code details from original issue

Attached Logs

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Environment Information

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.18363
VSCode	1.41.1
PowerShell Extension Version	2019.12.0

PowerShell Information

Name	Value
PSVersion	5.1.18362.145
PSEdition	Desktop
PSCompatibleVersions	1.0 2.0 3.0 4.0 5.0 5.1.18362.145
BuildVersion	10.0.18362.145
CLRVersion	4.0.30319.42000
WSManStackVersion	3.0
PSRemotingProtocolVersion	2.3
SerializationVersion	1.1.0.1

Visual Studio Code Extensions

Visual Studio Code Extensions(Click to Expand)

Extension	Author	Version
auto-rename-tag	formulahendry	0.1.1
beautify	HookyQR	1.5.0
bracket-pair-colorizer-2	CoenraadS	0.0.29
code-settings-sync	Shan	3.4.3
codesnap	adpyke	1.0.26
excel-to-markdown-table	csholmq	1.1.0
gistfs	vsls-contrib	0.0.23
github-linker	gimenete	0.2.3
gitlens	eamodio	10.2.0
html-preview-vscode	george-alisson	0.2.5
markdown-all-in-one	yzhang	2.6.1
markdown-preview-enhanced	shd101wyy	0.5.0
markdown-shortcuts	mdickin	0.12.0
material-icon-theme	PKief	3.9.2
pdf	tomoki1207	0.5.1
powershell-preview	ms-vscode	2019.12.0
project-manager	alefragnani	10.9.1
reg	ionutvmi	1.0.1
theme-monokai-pro-vscode	monokai	1.1.14
vscode-html-css	ecmel	0.2.3
vscode-markdownlint	DavidAnson	0.33.0
vscode-pull-request-github	GitHub	0.13.0
vscode-wakatime	WakaTime	2.2.1
vscode-yaml	redhat	0.6.1
xml	DotJoshJohnson	2.5.0

[PrzemyslawKlys]

You are correct.

• It doesn’t work in PS5, PS7
• It doesn’t work in old extension
• It doesn’t work in new extension

I know what you’re going to say 🥴

[PrzemyslawKlys]

I believe I already did?

• No completions for dynamic parameters on command in scriptblock
• Autocomplete doesn’t work if parameter type is unknown

Unless you mean something else?