Error when doing export { ... } from of a deferred export
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nicolo-ribaudo
commented
Oct 24, 2025
| 1. Let _resolution_ be _module_.ResolveExport(_e_.[[ExportName]]). | ||
| 1. If _resolution_ is either *null* or ~ambiguous~, throw a *SyntaxError* exception. | ||
| 1. Assert: _resolution_ is a ResolvedBinding Record. | ||
| 1. <ins>If _resolution_.[[Module]] is a Cyclic Module Record and _e_ was exported by an |ExportDeclaration| with an |ExportFromClause|, then</ins> |
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This is a tiny bit hand-wavy, I plan to add an internal slot on Source Text Module Record that lists the bindings that "were exported by an |ExportDeclaration| with an |ExportFromClause|".
This was referenced Oct 24, 2025
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#5 (comment)
This PR makes it an error to make
export { foo } from "x"of a binding that was exported asexport defer { foo } from "somewhere else", since it nullifies the benefits ofdefer. Developers would still be able to force this behavior by doingimport { foo } from "x"; export { foo }, but it prevents them from doing accidentally.I plan to discuss this PR at the next plenary.