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Add typings exports - #1623

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KKonstantinov merged 2 commits into
modelcontextprotocol:v1.xfrom
dust-tt:typings-exports
Mar 26, 2026
Merged

Add typings exports#1623
KKonstantinov merged 2 commits into
modelcontextprotocol:v1.xfrom
dust-tt:typings-exports

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@tdraier

@tdraier tdraier commented Mar 4, 2026

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Motivation and Context

TypeScript projects using moduleResolution: "bundler" (or "node16") cannot resolve type declarations for subpath imports like @modelcontextprotocol/sdk/types or @modelcontextprotocol/sdk/shared/transport. This is because the exports map lacks "types" conditions, so TypeScript doesn't know where to find .d.ts files for these subpaths.

How Has This Been Tested?

Verified that a TypeScript project with moduleResolution: "bundler" can resolve @modelcontextprotocol/sdk/types, @modelcontextprotocol/sdk/shared/transport, and other subpath imports without needing tsconfig.json paths workarounds.

Breaking Changes

None. Adding "types" conditions is purely additive — it enables TypeScript to resolve types that previously required manual paths configuration. Existing setups using typesVersions or explicit paths will continue to work.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

The "types" condition is the modern replacement for "typesVersions" and is recommended by TypeScript for packages using exports. Only the named subpaths (., ./client, ./server) and the catch-all (./) needed updating — the ./validation/ and ./experimental/* entries are covered by the ./* catch-all.

@tdraier
tdraier requested a review from a team as a code owner March 4, 2026 11:13
@changeset-bot

changeset-bot Bot commented Mar 4, 2026

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🦋 Changeset detected

Latest commit: b80704d

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

@pkg-pr-new

pkg-pr-new Bot commented Mar 4, 2026

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Open in StackBlitz

npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1623

commit: eaf514d

@tdraier

tdraier commented Mar 12, 2026

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Author

@felixweinberger can you please have a look ? this is really blocking us as we need to add ugly typescript mappings to get type defs 🙏

@KKonstantinov
KKonstantinov merged commit c95cc09 into modelcontextprotocol:v1.x Mar 26, 2026
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@KKonstantinov

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Contributor

LGTM!

sbosio added a commit to heroku/heroku-mcp-server that referenced this pull request Aug 11, 2026
## Summary

Dependency updates to fix multiple high security vulnerabilities
reported by Dependabot on `js-yaml`.

As part of the update, `@modelcontextprotocol/sdk` was updated to
v1.30.0 and that required update for the imports in all files because
type exports were added in v1.29.0 (see:
modelcontextprotocol/typescript-sdk#1623) that
didn't break building the package, but did affect linting
(no-unresolved-module started to fail without changes applied).

## Type of Change

### Breaking Changes (major semver update)

- [ ] Add a `!` after your change type to denote a change that breaks
current behavior

### Feature Additions (minor semver update)

- [ ] **feat**: Introduces a new feature to the codebase

### Patch Updates (patch semver update)

- [ ] **fix**: Bug fix
- [X] **deps**: Dependency upgrade
- [ ] **revert**: Revert a previous commit
- [ ] **chore**: Change that does not affect production code
- [ ] **refactor**: Refactoring existing code without changing behavior
- [ ] **test**: Add/update/remove tests

## Testing

1. Passing CI suffices.

## Related Issues

Dependabot alerts:
- https://github.com/heroku/heroku-mcp-server/security/dependabot/125
- https://github.com/heroku/heroku-mcp-server/security/dependabot/149
- https://github.com/heroku/heroku-mcp-server/security/dependabot/145
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2 participants