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add tracing for turbopack (vercel#49920)
### What? adds `NEXT_TURBOPACK_TRACING` env var to enable tracing. Writes into `.next/trace.log` There are 4 presets: * `NEXT_TURBOPACK_TRACING=overview` gives a overview of requests and modules processed. * `NEXT_TURBOPACK_TRACING=next` above plus details for next.js * `NEXT_TURBOPACK_TRACING=turbopack` above plus details for turbopack * `NEXT_TURBOPACK_TRACING=turbo-tasks` above plus details for turbo-tasks Published release builds will only allow `overview` to work, since all detailed instrumentation is statically disabled. see vercel/turborepo#4966 for more details ### Why? get more insight into build times ### Turbopack changes * vercel/turborepo#4995 * vercel/turborepo#5049 * vercel/turborepo#5053 * vercel/turborepo#4966
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