Turbopack (stable in Next 16) becomes the code default in the three entry
points that previously required an explicit OMNIROUTE_USE_TURBOPACK=1:
- scripts/build/build-next-isolated.mjs (production build)
- scripts/dev/run-next.mjs (dev server)
- scripts/dev/run-next-playwright.mjs (playwright dev runner)
OMNIROUTE_USE_TURBOPACK=0 remains the webpack escape hatch (Windows /
native-binding / bundler-compat issues), and only the documented '0'
opts out — junk values keep the default.
Benchmarked on this codebase (same tree, Next 16.2.9): webpack 1035s vs
Turbopack 539s on a 32-core box; ~20min vs 6min59s on ubuntu-latest.
Artifact validated end-to-end (standalone smoke + e2e/package-artifact/
electron-package-smoke CI jobs, Docker amd64+arm64 builds clean with the
v3.8.27 ImportTracer panic gone on 16.2.9).
TDD: tests/unit/build-bundler-default-turbopack.test.ts (new) +
run-next-playwright.test.ts extended with the unset-env default case;
both red before the flip, green after. ENVIRONMENT.md updated.
