[puskuruk]

apps/hello-nest (a decorated controller on NodeAdapter, @nestjs/core 12.2.0) compiles with geatsc. tools/nest/aot resolves @Module, @Controller, @Injectable and the route decorators with the TypeScript checker into a generated module function; scripts/build.mjs runs it as a compiler source-transform plugin, and reflect-metadata and the three @nestjs packages map to typed shims the generated application drives.

The app was added on 12.1.3; the last commit moves it to the 12.2.0 tarballs of Nest 2/4 and ports 12.2.0's adapter exception mapping into the core shim: an http-errors style client error (body parser, URI too long) becomes an HttpException with its status and message, a 5xx one stays an unknown exception.

Builds with the published compiler 1.0.47, which carries the four fixes this needed (geastack/compiler#7 to geastack/compiler#10). The package.json floor is still ^1.0.43; raising it is open.

• b2c005b Add tools/nest/aot: resolve @module, @controller, @Injectable and the route decorators with the checker into a generated module function
• ac20079 Map reflect-metadata and @nestjs/common, core and platform-node to typed shims the AOT-generated application drives
• 3cf52e7 Rewrite a Nest entry through the AOT resolver as a compiler source-transform plugin in build.mjs
• 843f567 Add hello-nest on NodeAdapter with platform-node 12.1.3
• ff92b5d Add scripts/test-hello-nest.mjs comparing the compiled hello-nest against its Node oracle over eleven requests
• df1a705 Move hello-nest to platform-node 12.2.0 and map client http-errors as the adapter does

Verification on df1a705 with 1.0.47: node scripts/test-hello-nest.mjs → HELLO_NEST_PARITY: 10 of 11 identical. The one deviation is the JSON.parse error message wording on POST /json with a malformed body, which geastack/compiler#21 fixes: built with the compiler stack https://github.com/geastack/compiler/pull/22 the same app answers 11 of 11. tools/nest check 24 tables passed; the other 32 scripts/test-*.mjs pass.

Benchmark

Same app under Node and compiled, bench/http-matrix.py (Nest 4/4), 2026-10-25, arm64 Ubuntu 24.04 container on an 8-vCPU Colima VM (Apple M1), VM and host otherwise idle, compiler 1.0.47: 2 s warmup, 8 s samples, wrk -t4 -c64, three interleaved rounds, server on vCPUs 0-3, wrk on 4-7. Not the bench host, so compare ratios, not absolute sizes, across runs.

Server	1w /	1w /json	1w PSS MiB	1w startup ms	4w /	4w /json	4w PSS MiB	4w startup ms	4w p50	4w p99
nest-gea	121,585	114,648	9.6	12	324,514	314,454	11.2	12	148 µs	736 µs
nest-node	54,336	52,106	118.5	498	175,532	165,650	350.7	924	318 µs	1.66 ms
hono-gea	153,784	121,440	6.4	7	376,158	323,931	8.5	8	128 µs	844 µs
hono-node	32,085	29,943	115.9	65	99,174	90,035	255.5	103	571 µs	2.02 ms
gea-raw	232,639	229,654	4.5	9	459,725	474,422	5.9	7	96 µs	1.68 ms
node-raw	58,188	57,713	88.1	53	180,682	177,656	182.4	76	302 µs	1.17 ms

GET /: compiled Nest 2.24× Nest on Node at one worker and 1.85× at four, 1.80× bare node:http on Node, 0.86× compiled Hono; PSS 1/31; startup 12 ms against 498 ms and 924 ms. Binary 8,016,904 bytes. Raw records and the full ten-server table are in Nest 4/4.

Related

Stack: #6 (1/4) → #7 (2/4) → this PR → #9 (4/4, benchmark harness and raw records). Parity 11 of 11 needs geastack/compiler#21 (stack https://github.com/geastack/compiler/pull/22).

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[puskuruk]

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