feat(vite): augment library .d.ts with Ivy type declarations (#104)

[brandonroberts]

Summary

Closes #104 — library .d.ts support at the plugin layer.

When building an Angular library with compilationMode: 'partial', the plugin now augments the emitted .d.ts with Angular's Ivy type declarations (static ɵfac, static ɵcmp, …) so downstream consumers get full template type-checking against the published library.

The compiler already returns these per-class members on the transform result (dtsDeclarations, added in #86/#101); this PR wires them through the Vite plugin.

How it works

• During transform (partial mode only), result.dtsDeclarations are collected, keyed by class name.
• A new dtsPlugin (enforce: 'post') runs in generateBundle, after the user's declaration generator has emitted its .d.ts assets, and splices the members into the matching classes — adding import * as i0 from "@angular/core" where needed.
• It is a no-op outside compilationMode: 'partial'.

The plugin does not generate the base .d.ts itself — a declaration generator (rolldown-plugin-dts, vite-plugin-dts, tsdown, or tsc) produces them; we augment them.

// Angular library build
import { angular } from '@oxc-angular/vite'
import dts from 'rolldown-plugin-dts'

export default defineConfig({
  plugins: [angular({ compilationMode: 'partial' }), dts()],
  build: { lib: { entry: 'src/public-api.ts', formats: ['es'] } },
})

Changes

• vite-plugin/utils/dts.ts — injectDtsDeclarations injector (idempotent; skips unmatched classes; preserves leading triple-slash refs).
• vite-plugin/index.ts — collect declarations during transform; new post-enforce dtsPlugin augmenting .d.ts bundle assets.
• test/dts.test.ts — 7 tests, including an end-to-end run through the real Rust compiler.
• README.md — "Library builds (.d.ts)" section.

Notes

• TS-only — no native rebuild required.
• Full suite passes (200/200); new file lints/formats clean (oxfmt, oxlint).

🤖 Generated with Claude Code

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