feat: support import defer in module graph#640
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bartlomieju merged 1 commit intomainfrom Apr 20, 2026
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Include `import defer` and `import.defer()` dependencies in the module graph instead of skipping them. Deferred imports need to be fetched and compiled (prepared) so the runtime can instantiate them, even though evaluation is deferred until first namespace access. Added `ImportDefer` variant to both `StaticDependencyKind` and `DynamicDependencyKind`. Deferred imports are treated as ES module imports for graph building purposes (same resolution mode and import kind as regular imports). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Include
import deferandimport.defer()dependencies in the module graph instead of skipping them.Previously, deferred imports were returned from (
return) in the dependency collector, meaning they were completely excluded from the module graph. This causedLoading unprepared moduleerrors at runtime because the deferred module was never fetched or compiled.Deferred imports need to be in the graph so they are fetched and compiled (prepared), even though evaluation is deferred until first namespace access at runtime.
Changes
ImportDefervariant toStaticDependencyKindandDynamicDependencyKindImportKind::Es, same resolution mode)Needed by denoland/deno#32360 (TC39 import defer proposal).
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