Support special import names for unit futures/streams #2390
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This commit enhances `wit-component`'s import detection to support "unit" `future` and `stream` types which don't have a payload in a special way. Previously it was required that these types were mentioned in some WIT somewhere to get connected to a function, but now it's possible to import these intrinsics directly even if the type isn't mentioned in WIT. The motivation for this change is to support guest language async runtimes which are world-agnostic to still operate on unit futures/streams as necessary without binding them to any particular WIT import or export. For example it's expected that unit streams are a primitive for inter-task communication in the component model.
dicej
approved these changes
Nov 25, 2025
Co-authored-by: Joel Dice <joel.dice@fermyon.com>
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This commit enhances
wit-component's import detection to support "unit"futureandstreamtypes which don't have a payload in a special way. Previously it was required that these types were mentioned in some WIT somewhere to get connected to a function, but now it's possible to import these intrinsics directly even if the type isn't mentioned in WIT.The motivation for this change is to support guest language async runtimes which are world-agnostic to still operate on unit futures/streams as necessary without binding them to any particular WIT import or export. For example it's expected that unit streams are a primitive for inter-task communication in the component model.