feat!: remove TOON encoding/decoding helper functions

[subtleGradient]

Description

Removes the @toon-format/toon dependency and related TOON encoding/decoding helper functions that were added in #276.

Motivation: The TOON integration was adding ~100kb and 83 dependencies to the bundle, which is too heavy for an optional feature. Additionally, there was a type issue where the types were always imported in index.d.ts even though the package was marked as optional, forcing downstream consumers to install @toon-format/toon to pass type checking.

BREAKING CHANGE: The following exports are removed:

• encodeToon
• decodeToon
• ToonEncodeOptions
• ToonDecodeOptions
• JsonValue

Users who were using these helpers should import directly from @toon-format/toon instead.

Human Review Checklist

• Confirm this breaking change is acceptable
• Verify changeset versioning is correct (marked as patch with BREAKING CHANGE note)

Updates since last revision

• Fixed pre-existing import ordering issue in src/chat/index.ts to make CI pass

Link to Devin run: https://app.devin.ai/sessions/5b9b891e53a74338b6d51d66f1ef20f0
Requested by: Tom Aylott (@subtleGradient)

Checklist

• I have run pnpm stylecheck and pnpm typecheck
• I have run pnpm test and all tests pass
• I have added tests for my changes (if applicable)
• I have updated documentation (if applicable)

Changeset

• I have run pnpm changeset to create a changeset file

Note: A changeset is required for your changes to trigger a release. If your PR only contains docs, tests, or CI changes that don't need a release, run pnpm changeset --empty instead.

[devin-ai-integration]

Original prompt from Tom

SYSTEM:
=== BEGIN THREAD HISTORY ===
James Sterling (U09LUTAUYSH): Just revisiting a Devin session, and noticed <@U09KAC36W0G> you merged a draft PR <https://github.com/OpenRouterTeam/ai-sdk-provider/pull/276>?

James Sterling (U09LUTAUYSH): didn't even have a chance to review &amp; test

James Sterling (U09LUTAUYSH): did you <@U09KAC36W0G>?

aylott, tom (U09KAC36W0G): yes, did review; didn't see that it was a draft

aylott, tom (U09KAC36W0G): captured this: <https://linear.app/openrouter/issue/PLA-1/unbreak-types-when-not-including-optional-peers|PLA-1: unbreak types when not including optional peers>
will fix the types issue and figure out a test moving forward so we don't regress types when people choose not to include optional deps

aylott, tom (U09KAC36W0G): by default Devin open up real PRs and not draft PRs. I can't tell now that this one was draft.
But now I'll be double careful to skip anything still in draft

James Sterling (U09LUTAUYSH): there was no tagged reviewers, and no approvals

James Sterling (U09LUTAUYSH): we shouldn't merge without approval unless it's the author

aylott, tom (U09KAC36W0G): Gotcha. Typically with OSS the maintainers choose when to merge

aylott, tom (U09KAC36W0G): once the subtree sync stuff is fully stable, most internal contributions will happen within the monorepo so it'll be easier to remember that the workflow is different

James Sterling (U09LUTAUYSH): I mean, wouldn't the PR author be the primary? Are we not the maintainers?

aylott, tom (U09KAC36W0G): My bad. I treated this PR the same as every other PR in this repo. Forgot/didn't notice that this PR was from an employee

James Sterling (U09LUTAUYSH): I bring this up because I didn't even have a chance to review Devin's work, as the requestor I think we need to be reviewing AI's work.

James Sterling (U09LUTAUYSH): I dropped the ball on getting to this, as it was just spitballin' ideas with Devin. So on me for not keeping up as well.

aylott, tom (U09KAC36W0G): we had a ... (1232 chars truncated...)

[devin-ai-integration]

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[Copilot]

Pull request overview

This PR removes the TOON format integration to reduce bundle size and eliminate type dependencies. The integration was adding ~100kb and 83 dependencies for an optional feature, and caused type issues where downstream consumers were forced to install @toon-format/toon even when not using it.

Key Changes:

• Removed TOON encoding/decoding helper functions and related type exports
• Removed @toon-format/toon from dependencies and peer dependencies
• Fixed a pre-existing import ordering issue in src/chat/index.ts

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/toon/toon.test.ts	Deleted test file for TOON helper functions
src/toon/index.ts	Deleted TOON helper implementation including encodeToon, decodeToon functions and type exports
src/index.ts	Removed export statement for toon module
src/chat/index.ts	Fixed import ordering (FileAnnotation moved after OpenRouterUsageAccounting)
package.json	Removed @toon-format/toon from devDependencies, peerDependencies, and peerDependenciesMeta
.changeset/remove-toon.md	Added changeset documenting the breaking change

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

This breaking change removes public API exports and should be marked as a major version bump, not a patch. Consider changing 'patch' to 'major' to follow semantic versioning conventions.

Suggested change

	"@openrouter/ai-sdk-provider": patch
	"@openrouter/ai-sdk-provider": major