[dennisofficial]

Decision #98. apps/api specs intermittently failed with require() async module "@nestjs/core" is unsupported while @nestjs/throttler loaded (reruns on #1366, #1373, #1378).

Root cause: a Bun module-loader race, oven-sh/bun#33180 (regressed in 1.3.14; the fix, oven-sh/bun#37185, is still open). @nestjs/throttler is CJS and require()s @nestjs/common/@nestjs/core from its module body while the ESM graph is still fetching them. A require() that lands on an entry with Fetching status is misreported as an async module. Ruled out:

• top-level await: none anywhere in the installed @nestjs/* graph;
• the incremental preload: the failure reproduces without it;
• plain bun importing the same graph: clean, 0/60.

Fix: apps/api/nestjs-preload.ts, loaded first in bunfig.toml, imports both packages before any spec loads, so throttler's require() takes the synchronous path.

Configuration	Before	After
single spec (sandbox-checkpoint-write)	3/30	0/40
two specs together	1/12	0/40
BUN_TEST_INCREMENTAL=1	—	0/40
full apps/api suite	intermittent (main run 39888923913)	0 async-module errors, 1197 tests

Test-only: nothing in the shipped app changes.

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