Bicep crashes when working with params that are nullable custom type

[tmarkovski]

Bicep server crashes when setting params in param file which are nullable in the bicep file

Does this occur consistently? Yes
Repro steps:

1. Create types in a separate file 'types.bicep' with any fields or types

@export()
type MyType = {
  name: string?
}

2. Use the type in your 'main.bicep' file, but make it nullable

import { MyType } from 'types.bicep'

param myVar MyType?

3. In your 'main.bicepparam' try to assign values to myVar . The server crashes with "Connection error" when trying to type the field names

using 'main.bicep'

param myVar = {
  na.... <crash>
}

4. Try setting the type of myVar to non-nullable param myVar MyType = {}, go back to main.bicepparam and try entering name, autocomplete menu shows up with no error.

Action: bicep.lsp-error
Error type: Error
Error Message: Connection closed

Version: 0.31.34
OS: darwin
OS Release: 24.0.0
Product: Visual Studio Code
Product Version: 1.95.2
Language: en

Call Stack

callback client.ts:213:15
callWithTelemetryAndErrorHandlingSync @microsoft/callWithTelemetryAndErrorHandling.js:68:16
Object.closed client.ts:210:7
LanguageClient.handleConnectionClosed vscode-languageclient/client.js:1164:72
LanguageClient.handleConnectionClosed vscode-languageclient/main.js:180:22
apply vscode-languageclient/client.js:1142:18
CallbackList.call [as invoke] vscode-jsonrpc/events.js:55:39
Emitter.fire vscode-jsonrpc/events.js:117:36
apply vscode-jsonrpc/connection.js:314:26
CallbackList.call [as invoke] vscode-jsonrpc/events.js:55:39
Emitter.fire vscode-jsonrpc/events.js:117:36
SocketMessageWriter.fireClose vscode-jsonrpc/messageWriter.js:42:27
Socket.<anonymous> vscode-jsonrpc/messageWriter.js:74:42