chore: use tsrs for build type checking

[fengmk2]

Replace the TypeScript 5 check in Next.js builds with tsrs to reduce type-check time. The build script checks types after Next.js generates declarations and fails on type errors. npm run typecheck also runs this check directly.

scripts/tsrs.js selects native tsrs on macOS ARM64 and Linux ARM64/x64. It uses @ts-rs/wasm on other platforms, including Windows. The typescript dependency remains because Next.js requires its compiler API.

The configuration uses es2015 and bundler, which the newer compiler supports. Test files remain outside the build's type-check scope, as in Next.js. Explicit Next.js and CSS declarations support type checks before the first build.

Standalone type checking took 89% less time, an 8.88× speedup:

Compiler	Median time
typescript@5.9.3	1.267 s
tsrs@0.15.0-ts7.1.0-dev.20260929	0.143 s

Each compiler had one warmup and five interleaved measured runs with the same source, dependencies, and final tsconfig.json. Both used --noEmit --incremental false, fresh processes, and warm filesystem caches. These times cover type checking only, not the full Next.js build.

The machine used an Apple M4 Max, macOS 26.2, and Node.js 22.23.2. The compiler versions target different TypeScript revisions.

Summary by CodeRabbit

• Chores
  • The production build now runs a TypeScript check after building.
• Documentation
  • Development instructions now include commands for running TypeScript checks and creating a production build.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: b821ce66-d3bf-494d-be49-c063d1b9220c

📥 Commits

Reviewing files that changed from the base of the PR and between fdb5000 and 2b98e57.

📒 Files selected for processing: 6

• README.md
• index.d.ts
• next.config.js
• package.json
• scripts/tsrs.js
• tsconfig.json

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📝 Walkthrough

The project adds a TypeScript check command and runs it after the Next.js production build. The changes also update TypeScript compiler options, declarations, platform-specific compiler selection, and development instructions.

Changes: TypeScript build checks

Layer / File(s)	Summary
Configure TypeScript checking index.d.ts, tsconfig.json, package.json, scripts/tsrs.js	The TypeScript configuration targets ES2015, uses bundler module resolution, and excludes test files. The declarations add Next.js types and a CSS module declaration. A script selects the native tsrs compiler on specified arm64 and x64 platforms and uses @ts-rs/wasm on other platforms. Both packages are added as development dependencies.
Run checks after the production build next.config.js, package.json, README.md	The build script runs typecheck after next build. Next.js ignores build-time TypeScript errors, and the development instructions list the typecheck and build commands.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Suggested reviewers: elrrrrrrr

Merge Risk: ⚪ Minimal · up to 2b98e

The checked-in CI and documented package build run the new typecheck. No concrete current-head issue is established; the external webhook’s build command is not visible, so a deployment bypass is unconfirmed.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: using tsrs for build-time TypeScript checking.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3 files. (3 skipped: 3 unsupported.)

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package.json

Parsing error: Missing semicolon. (2:8)

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​ts-rs/​wasm@​0.15.0-ts7.1.0-dev.20260929
	npm/​tsrs@​0.15.0-ts7.1.0-dev.20260929

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