error TS2420: Class 'StreamableHTTPServerTransport' incorrectly implements interface 'Transport'.

[jetbuster]

I've updated to 1.25.1, and I get

../../node_modules/@modelcontextprotocol/sdk/dist/esm/server/streamableHttp.d.ts:58:22 - error TS2420: Class 'StreamableHTTPServerTransport' incorrectly implements interface 'Transport'.
Types of property 'onclose' are incompatible.
Type '(() => void) | undefined' is not assignable to type '() => void'.
Type 'undefined' is not assignable to type '() => void'.

58 export declare class StreamableHTTPServerTransport implements Transport {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Found 1 error.

I suspect this is due to "exactOptionalPropertyTypes": true in my tsconfig.json.

[felixweinberger]

Thanks for reporting! We don't currently support exactOptionalPropertyTypes - there are other type errors when enabled beyond this one.

Workaround: Add "skipLibCheck": true to your tsconfig.json. This skips type checking of .d.ts files in node_modules (we use this ourselves).

Probably won't get to this on the team in the short term but happy to review a PR.