fix(types): support non-DOM runtime declarations

[jerome-benoit]

Summary

• make the emitted BenchEvent declaration compatible with runtimes whose Event constructor is not exposed through typeof globalThis
• type performanceNow as the existing NowFn contract so the declaration returns number instead of leaking DOMHighResTimeStamp
• compile the emitted bundle against Workerd types with skipLibCheck: false, while preserving the literal BenchEvent.type contract

Root cause

Two source-level DOM details leaked into the public declaration bundle:

1. BenchEvent extends globalThis.Event was emitted verbatim. Wrangler-generated Workerd declarations provide the global Event type, but do not expose Event as a property of typeof globalThis.
2. performance.now.bind(...) had no explicit annotation, so TypeScript inferred the DOM alias DOMHighResTimeStamp instead of Tinybench's runtime-neutral NowFn return type.

The existing Workerd consumer inherited skipLibCheck: true from the root configuration. It validated listener call sites but did not validate dist/index.d.ts, allowing both ambient-type leaks through. These two diagnostics predated and were explicitly out of scope for #646.

Design

• expose an EventBase construct signature that omits only the base type member, then retain BenchEvent<K>["type"] as K
• annotate performanceNow with NowFn; runtime behavior stays unchanged
• override skipLibCheck in the permanent Workerd declaration consumer

Verification

• exact issue fixture, Wrangler 4.129.0 / TypeScript 6.0.3: two diagnostics before, zero after
• pnpm typecheck:workerd
• pnpm test — 64 files, 243 tests passed
• pnpm typecheck
• pnpm lint
• pnpm lint:typedoc
• pnpm build

Closes #658.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-05T12:01:07.795708Z	393ab16	New commits

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/tinybench@659

commit: 393ab16