chore: support Node.js >= 20 (not just 20.11) and test it in CI#538
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The ESM build only required Node >= 20.11 because it used import.meta.dirname / import.meta.filename. Replace those with fileURLToPath(import.meta.url) (the CJS build rewrites it to __filename), which works on any ESM-capable Node, and lower engines to >=20 so any Node 20 LTS is supported, not just 20.11+. Also run the unit tests on Node 20, 22 and 24 so the supported range is actually exercised (previously only 22 was tested).
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Prep for the 4.3.0 release: make the supported Node.js floor honest and tested.
Why
The ESM build only ran on Node >= 20.11 because of
import.meta.dirname/import.meta.filename(added in 20.11). That excluded early Node 20 LTS (20.0–20.10) for no real reason.Changes
import.meta.dirname/import.meta.filenamewithfileURLToPath(import.meta.url)(works on any ESM-capable Node). The CJS build's replace step rewrites it to__filename, so both builds keep working. Verified by running a real background task on both the ESM and CJS builds.engines.nodeto>=20.The next real floor below this is the timezone code's
IntltimeZoneName: 'shortOffset'(~Node 18, now EOL), so >=20 LTS is the sensible, honest floor.Full suite green (260 tests), build and lint pass.