module: print required top-level await without side effects#64154
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joyeecheung wants to merge 1 commit into
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module: print required top-level await without side effects#64154joyeecheung wants to merge 1 commit into
joyeecheung wants to merge 1 commit into
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anonrig
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Jun 26, 2026
Previously in order to collect the locations of the TLA, we wait until right before evalutation to ensure instantiation is completed so that we can use v8::Module::GetStalledTopLevelAwaitMessages(). Now we try to add an additioanl shortcut to the source code in the module wraps instead during compilation for modules that contain TLAs and use acron to locate the TLAs when we need to throw ERR_REQUIRE_AYNSC_MODULE, so we can do this as early as before instantiation and do not need to run the module again to collect the locations. In addition, we now collect the require stack for ERR_REQUIRE_ASYNC_MODULE too for better metadata in the errors.
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This paves the way for enabling
--experimental-print-required-tlaby default.Previously in order to collect the locations of the required TLA, we rely on v8::Module::GetStalledTopLevelAwaitMessages() which requires evaluating the module first, hence --experimental-print-required-tla incurred side-effects. This patch switches to parsing the graph using acorn to collect locations of TLAs instead when we need to throw ERR_REQUIRE_AYNSC_MODULE, so that we can print them without evaluating the modules and --experimental-print-required-tla is now free of side-effects.
In addition, we now collect and print the require stack for ERR_REQUIRE_ASYNC_MODULE too. It now carries two more non-enumerable properties:
requireStack: similar to the one carried by ERR_MODULE_NOT_FOUNDtopLevelAwaitLocations: an array containing metadata about the located top-level-awaits in the graph.