feat(functions): implement waitUntil runtime integration#207
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Forward the deferred promise to the Neon Functions runtime via its
per-invocation context (globalThis[NEON_FUNCTIONS_CONTEXT], a
Symbol.for("@neondatabase/functions/request-context")), keeping the
invocation alive until the promise settles. Matches Vercel's spec: a
non-Promise argument throws TypeError, and the function no-ops when no
runtime context is present (local dev, tests, non-Neon hosts). Export
NEON_FUNCTIONS_CONTEXT as the documented runtime contract.
…LocalStorage context
Switch waitUntil from a factory to a direct call (waitUntil(promise)) to mirror
@vercel/functions. Carry per-invocation context in an AsyncLocalStorage published on
globalThis[NEON_FUNCTIONS_CONTEXT] as a `{ get() }` provider (Vercel/Next contract),
fixing context clobbering across concurrent invocations. Add runWithRequestContext for
the runtime to bind a context per invocation.
jeff-at-neon
approved these changes
Jun 14, 2026
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Summary
Implements
waitUntil()in@neondatabase/functions(replaces the no-op placeholder).waitUntil()now forwards the promise to the Neon Functions runtime via its per-invocation context:globalThis[NEON_FUNCTIONS_CONTEXT], whereNEON_FUNCTIONS_CONTEXT = Symbol.for("@neondatabase/functions/request-context")(mirrors Vercel's@vercel/request-contextconvention).waitUntilspec: a non-Promiseargument throwsTypeError.waitUntil()is called at module scope.NEON_FUNCTIONS_CONTEXTas the documented runtime contract; README updated; changeset added (minor).Open question for review
The global context key is not yet confirmed against the runtime host — please verify
Symbol.for("@neondatabase/functions/request-context")(and the flat.waitUntilshape vs. a Vercel-style.get()accessor) matches what the Functions runtime actually publishes. If it doesn't,waitUntilwill silently no-op in production.Test plan
pnpm tsc(typecheck)pnpm test:ci(5 tests, realglobalThiswiring, no mocks)pnpm build(tsdown)