fix(jsruntime): #1021 — nestjs sweep silent exit (CJS cycles + process.exit)

[proggeramlug]

Summary

Closes the nestjs entry in /tmp/perry-compat-sweep/nestjs from silent exit (empty stdout, inherits TypeError on stderr) to a real HTTP server that boots and responds. Three layered V8-fallback gaps:

• Template-literal interpolation regression: wrap_commonjs's require-extractor ate every require() that followed a ${...}-containing template literal. Refactored to a stack-aware scan_template_literal that correctly balances interpolated expressions / nested strings / nested templates. Without this, busboy's lib/index.js lost two of its three require() calls and crashed downstream.
• CJS cycle break: readable-stream's _stream_readable.js / _stream_duplex.js form a 1-hop cycle (one peer top-level-requires the other and uses .prototype immediately at module init via the util.inherits(Duplex, Readable) shape; the other lazy-requires from inside method bodies). The wrap used to hoist all require() into static ESM imports, which turned the lazy CJS edge into a static ESM cycle and made V8 evaluate one peer with the other's bindings in TDZ. Fix:
  • Brace-aware classifier distinguishes top-level requires from those inside function/method/arrow bodies.
  • 1-hop cycle detector: when a relative spec only appears inside a function body, read the peer's source from disk and check whether it requires us back. If yes, skip the static ESM import and resolve at call time.
  • __perry_require_lazy runtime resolver backed by globalThis.__perry_cjs_partial registry that every wrapped module populates with its module object on entry. Lazy requires resolve once the peer's IIFE has finished. Plus auxiliary registration by package name for require(packageName) patterns (NestJS's loadAdapter).
• process.exit polyfill: NestJS's loadAdapter calls process.exit(1) to bail; the missing polyfill turned the real MODULE_NOT_FOUND into a noisy process.exit is not a function TypeError. Added a log-and-continue shim.

Sweep impact

• nestjs: silent exit → HTTP server boots, returns 404 for unregistered route. The body= prefix now reaches stdout. Full body=pong parity is gated on Perry-emitted decorator metadata becoming visible to V8-side Reflect.getMetadata (separate work item — Reflect.defineMetadata/getMetadata are not present on Perry-compiled Reflect, so V8's bridge can't see the route registrations).
• express, hono, debug, dotenv, jose, date-fns, ioredis: all still PASS post-fix (re-verified with the rebuilt binary).

Test plan

• New end-to-end fixture: test-files/test_issue_1021_cjs_cycle.ts exercises the 1-hop CJS cycle shape and asserts byte-for-byte parity with node --experimental-strip-types.
• Three new unit tests in crates/perry-jsruntime/src/modules.rs:
  • test_classify_top_level_in_array_literal — busboy's [ require(...), require(...) ] pattern.
  • test_classify_lazy_inside_method_body — readable-stream's lazy require pattern.
  • test_wrap_template_literal_doesnt_eat_following_requires — regression for the busboy scanner bug.
• All 18 modules::tests::* pass.
• Compat sweep re-run: express/hono/debug/dotenv/jose/date-fns/ioredis unchanged, nestjs now reaches its main body.

Notes

• No version bump or changelog change (external-contributor convention).
• Tracker: compat: async lowering blocks self-fetch (express/fastify/nestjs/hono) #1021 (async lowering + V8 fallback compat).
• Deferred: decorator metadata across the Perry/V8 boundary for full NestJS routing (Reflect.getMetadata returning 0 from compiled code; bridge not wired into compiled Reflect namespace).