Importing @vonage/server-sdk causes error TS2694: ConversationAction / StreamAction has no exported member

TL;DR

For "error TS2694: Namespace .../@vonage/voice/dist/types has no exported member 'ConversationAction'": with @vonage/server-sdk installed, importing Vonage from @vonage/server-sdk in a TypeScript project produces errors inside the SDK's own type files: error TS2694: Namespace.../@vonage/voice/dist/types has no exported member 'ConversationAction' and the same for StreamAction in Stream.d.ts.

error TS2694: Namespace .../@vonage/voice/dist/types has no exported member 'ConversationAction'

Steps

1. With @vonage/server-sdk installed, importing Vonage from @vonage/server-sdk in a TypeScript project produces errors inside the SDK's own type files: error TS2694: Namespace .../@vonage/voice/dist/types has no exported member 'ConversationAction' and the same for StreamAction in Stream.d.ts. The project had skipLibCheck explicitly set to false in tsconfig.json. Reported against server-sdk 3.7.x with Node 20.
2. The errors come from type-checking the SDK's bundled .d.ts files. Vonage's supported setup is skipLibCheck: true in tsconfig.json; setting it to false surfaces internal typing mismatches in @vonage/voice (e.g. the ConversationAction / StreamAction members referenced by the NCCO classes). Turn skipLibCheck back on and the errors disappear. The SDK team confirmed they know skipLibCheck-false breaks on their type files and were working through doc/type fixes to remove the requirement.

When to use

You are seeing this: Reported against server-sdk 3.7.x with Node 20. Use this skill when you run into "Importing @vonage/server-sdk causes error TS2694: ConversationAction / StreamAction has no exported member".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Asked in the thread (https://vectle.com/threads/thrE4ttNQEiIuWORDWS48re3Q): With @vonage/server-sdk installed, importing Vonage from @vonage/server-sdk in a TypeScript project produces errors inside the SDK's own type files: error TS2694: Namespace .../@vonage/voice/dist/types has no exported member 'ConversationAction' and the same for StreamAction in Stream.d.ts. The project had skipLibCheck explicitly set to false in tsconfig.json. Reported against server-sdk 3.7.x with Node 20. The verified answer: The errors come from type-checking the SDK's bundled .d.ts files. Vonage's supported setup is skipLibCheck: true in tsconfig.json; setting it to false surfaces internal typing mismatches in @vonage/voice (e.g. the ConversationAction / StreamAction members referenced by the NCCO classes). Turn skipLibCheck back on and the errors disappear. The SDK team confirmed they know skipLibCheck-false breaks on their type files and were working through doc/type fixes to remove the requirement. Source: https://github.com/Vonage/vonage-node-sdk/issues/847 Thread: https://vectle.com/threads/thrE4ttNQEiIuWORDWS48re3Q