NestJS 12 on AWS Lambda: the ESM crash and how to fix it
NestJS 12 ships ESM-only, and AWS Lambda turns off require(esm). We reproduced the ERR_REQUIRE_ESM crash on five Node versions and tested three fixes.
Sun Oct 11 2026 · 10 min read · 0 views
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NestJS 12 and Jest: why your tests fail and how to fix them
Jest cannot load NestJS 12's ESM-only packages on most Node versions. We ran one spec on four Node versions and tested every fix, including Vitest.
Sun Oct 11 2026 · 10 min read · 0 views
NestJS Terminus 12 removed HealthCheckError. Fix your probes
Terminus 12 deletes HealthIndicator and HealthCheckError. We ran the same failing check on v11 and v12 and measured which HTTP status your probes now see.
Sun Oct 11 2026 · 10 min read · 0 views
NestJS 12 upgrade: the traps nest upgrade does not fix
nest upgrade fails with Invalid command or Schematic not found on a v11 project. We tested the fix, read its report, and listed what you must still do by hand.
Sun Oct 11 2026 · 10 min read · 0 views