Bumps next, @next/env and the @next/swc-* optional deps to 16.3.0 across the
root overrides, apps/sim, apps/docs and packages/emcn.
Two config notes worth keeping:
- `experimental.turbopackFileSystemCacheForBuild`'s default flipped false ->
true for stable in 16.3.0, so our explicit `false` is now load-bearing rather
than defensive. Without it this bump would have silently re-enabled a build
cache measured 3.2x slower on this codebase (#6078). Comment updated to say so.
- `experimental.useTypeScriptCli: true` is now pinned. TypeScript 7 ships no
JavaScript compiler API until 7.1, so Next's default checker cannot run and
needs the project-local `tsc` CLI instead. 16.2.12 was silently skipping
build-time type checking entirely because it detected @typescript/native-preview
and short-circuited the stage ("Finished TypeScript in 138ms"); pinning the flag
keeps that from drifting back.
TypeScript toolchain cleanup that the upgrade makes possible:
- Drop @typescript/native-preview from apps/sim and apps/docs. It was the
pre-release channel for TS 7 and is superseded by typescript@7 (nightlies now
ship as typescript@next), and its presence is what suppressed build type checks.
- Align packages/browser-protocol and packages/terminal-protocol from
typescript ^5.7.3 to ^7.0.2 so every workspace is on one compiler version.
apps/sim keeps @typescript/typescript6 as a production dependency: the function
sandbox at app/api/function/execute dynamically imports the TS 6 compiler API to
transpile user code, and TS 7 has no API to replace it yet.
Build and dev were benchmarked 3x per version on a byte-identical tree; the
upgrade is performance-neutral (build median 100s -> 99s, dev:full warm 10s -> 9s).
Waleed
ed17bb2bac