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WebAssembly source phase imports #56056
Description
TC39 proposal source phase imports reached to stage 3 and has been implemented in V8 (starting from M131).
import source FooModule from "./foo.wasm";
FooModule instanceof WebAssembly.Module; // trueThe feature requires Node.js integration to support WebAssembly source phase imports. TLDR, if a SourceTextModule imports a source-phase WebAssembly module, create a module source object with v8::WasmModuleObject::Compile and return the WebAssembly.Module object from v8::Module::ResolveSourceCallback, and v8::HostImportModuleWithPhaseDynamicallyCallback.
See design doc for details.
/cc @guybedford
Activity
guybedford commentedon Nov 28, 2024
This should ideally be implemented along with the ESM instance imports and should likely also go with unflagging
--experimental-wasm-modules.bakkot commentedon Dec 1, 2024
There's not much reason to care about ESM instance imports without also having worker_threads support instantiating workers from a ModuleSource - which is worth doing, but is probably a bigger topic than wasm source phase imports (which are immediately useful).
sbc100 commentedon Dec 3, 2024
Emscripten would love to start using this feature as soon as its available: emscripten-core/emscripten#23047
guybedford commentedon Feb 28, 2025
This landed in #56919.