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chore(build): type-check what ships (tsconfig.build.json) and move to Next 16.3.1 (#1750)

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* chore(build): type-check what ships (tsconfig.build.json) and move to Next 16.3.1

Groundwork for the 2026 shape of the build, companion to #1749.

- tsconfig.build.json extends tsconfig.json and excludes tests/, __tests__,
  __mocks__ and *.test.ts(x); next.config.ts selects it via
  typescript.tsconfigPath. tsconfig.json is untouched and stays the
  editor/ESLint view of the whole repo.
- next 16.2.12 -> 16.3.1 (+ eslint-config-next). 16.3 runs the project-local
  tsc CLI by default, which is what lets typescript@^7 (native) slot in once
  typescript-eslint supports the TS 7.1 API, and turns on Turbopack's on-disk
  cache for next build.

The split has to land with the bump: the 16.3 CLI checker checks the
complete project it is given, while the old API checker silently dropped
diagnostics from test files. A full tsc --noEmit of main reports 493 type
errors, all in tests (mostly route handlers called without the ctx
argument); vitest never type-checks, so nothing caught them. Excluding tests
from the build keeps that debt where it was instead of turning it into a
red deploy; a tests type-check job is the follow-up. Measured: tests are
~10% of the check's memory, so this is correctness, not the memory fix.

Lockfile regenerated with npm 10 (CI pins node 20); the only structural
change is npm 10 de-nesting next-intl/node_modules/@swc/helpers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(build): only write standalone output off-Vercel; Vercel's 16.3 adapter owns tracing

The #1750 preview failed after a green compile and type-check with
ENOENT .next/next-server.js.nft.json right after "Running onBuildComplete
from Vercel": writeStandaloneDirectory copies from that trace file, and on
Vercel (adapterPath set) Next 16.3 no longer produces it; the adapter traces
and packages functions itself. Vercel never reads .next/standalone; the
Docker image does. Keep standalone for every non-Vercel build.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Jakob Wennberg
2026-08-20 15:27:13 +02:00
committed by GitHub
co-authored by Claude Fable 5 Jakob Wennberg
parent 051f467406
commit fbf47649f2
5 changed files with 95 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files
package-lock.json
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+55 -65
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@@ -42,7 +42,7 @@
"jszip": "^3.10.1",
"lucide-react": "^1.24.0",
"mailparser": "^3.9.14",
"next": "16.2.12",
"next": "16.3.1",
"next-intl": "^4.13.2",
"next-themes": "^0.4.6",
"pdf-lib": "^1.17.1",
@@ -78,7 +78,7 @@
"@types/web-push": "^3.6.4",
"dotenv": "^17.4.2",
"eslint": "^9",
"eslint-config-next": "16.2.12",
"eslint-config-next": "16.3.1",
"pg": "^8.22.0",
"tailwindcss": "^4",
"typescript": "^5",
@@ -3227,25 +3227,26 @@
}
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@@ -3259,9 +3260,9 @@
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@@ -3275,9 +3276,9 @@
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"cpu": [
"arm64"
],
@@ -3291,9 +3292,9 @@
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"cpu": [
"arm64"
],
@@ -3307,9 +3308,9 @@
}
},
"node_modules/@next/swc-linux-x64-gnu": {
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"cpu": [
"x64"
],
@@ -3323,9 +3324,9 @@
}
},
"node_modules/@next/swc-linux-x64-musl": {
"version": "16.2.12",
"resolved": "https://registry.npmjs.org/@next/swc-linux-x64-musl/-/swc-linux-x64-musl-16.2.12.tgz",
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"cpu": [
"x64"
],
@@ -3339,9 +3340,9 @@
}
},
"node_modules/@next/swc-win32-arm64-msvc": {
"version": "16.2.12",
"resolved": "https://registry.npmjs.org/@next/swc-win32-arm64-msvc/-/swc-win32-arm64-msvc-16.2.12.tgz",
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"cpu": [
"arm64"
],
@@ -3355,9 +3356,9 @@
}
},
"node_modules/@next/swc-win32-x64-msvc": {
"version": "16.2.12",
"resolved": "https://registry.npmjs.org/@next/swc-win32-x64-msvc/-/swc-win32-x64-msvc-16.2.12.tgz",
"integrity": "sha512-F6fakeHuFTLOPt0bslQJdf+xtT+WIP9DVn/m4y1w1mRnVPyh3D/cNvzlRkxM444xfm+IvvYNSOrKiA2CDJ0Uxw==",
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"cpu": [
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],
@@ -7152,9 +7153,9 @@
"license": "Apache-2.0"
},
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"license": "Apache-2.0",
"dependencies": {
"tslib": "^2.8.0"
@@ -10161,13 +10162,13 @@
}
},
"node_modules/eslint-config-next": {
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"resolved": "https://registry.npmjs.org/eslint-config-next/-/eslint-config-next-16.2.12.tgz",
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"dev": true,
"license": "MIT",
"dependencies": {
"@next/eslint-plugin-next": "16.2.12",
"@next/eslint-plugin-next": "16.3.1",
"eslint-import-resolver-node": "^0.3.6",
"eslint-import-resolver-typescript": "^3.5.2",
"eslint-plugin-import": "^2.32.0",
@@ -13616,16 +13617,16 @@
}
},
"node_modules/next": {
"version": "16.2.12",
"resolved": "https://registry.npmjs.org/next/-/next-16.2.12.tgz",
"integrity": "sha512-iD59eYQWmbFcEbX7v/acG5DRym9iw1DdaPoD0WTA920naWsE25wShzJW4+UvAs8MK9EC2kBfIH6vtto1H1PHGw==",
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"resolved": "https://registry.npmjs.org/next/-/next-16.3.1.tgz",
"integrity": "sha512-hsAp0i7Rh+/dhe7DGIeN2YlpLM1DP4MNxti9EtDMtqcO612X81MvvEj388/oTce9U1EcEIOWDlGq0zRwrBKvuA==",
"license": "MIT",
"dependencies": {
"@next/env": "16.2.12",
"@swc/helpers": "0.5.15",
"@next/env": "16.3.1",
"@swc/helpers": "0.5.23",
"baseline-browser-mapping": "^2.9.19",
"caniuse-lite": "^1.0.30001579",
"postcss": "8.4.31",
"postcss": "8.5.23",
"styled-jsx": "5.1.6"
},
"bin": {
@@ -13635,15 +13636,15 @@
"node": ">=20.9.0"
},
"optionalDependencies": {
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"@next/swc-darwin-x64": "16.2.12",
"@next/swc-linux-arm64-gnu": "16.2.12",
"@next/swc-linux-arm64-musl": "16.2.12",
"@next/swc-linux-x64-gnu": "16.2.12",
"@next/swc-linux-x64-musl": "16.2.12",
"@next/swc-win32-arm64-msvc": "16.2.12",
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"sharp": "^0.34.5"
"@next/swc-darwin-arm64": "16.3.1",
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"@next/swc-linux-arm64-gnu": "16.3.1",
"@next/swc-linux-arm64-musl": "16.3.1",
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},
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@@ -13745,17 +13746,6 @@
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}
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"license": "Apache-2.0",
"optional": true,
"peer": true,
"dependencies": {
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}
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