BUG: Logging or Progress notifications in typescript version is unusable

[daizeyao]

Checked other resources

• This is a bug, not a usage question. For questions, please use the LangChain Forum (https://forum.langchain.com/).
• I added a very descriptive title to this issue.
• I searched the LangChain.js documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain.js rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

await server.sendLoggingMessage({
level: 'info',
logger: 'streaming-test',
data: streamMessage,
timestamp: new Date().toISOString()
});

Error Message and Stack Trace (if applicable)

No response

Description

BUG: Logging or Progress notifications in typescript version is unusable

System Info

all latest