Andrea said in https://bugzilla.mozilla.org/show_bug.cgi?id=1472324#c1 'there is still a bigger issue to solve related to the importing of scripts as module in workers (and worklet). See bug 1247687. Currently we support script modules only on main-thread via <script type="module">. In order to support script modules in workers/worklet, we must unify WorkletFetchHandler, workerinternals::Load/LoadMainScript and mozilla::dom::ScriptLoader.' Ben said in https://bugzilla.mozilla.org/show_bug.cgi?id=1442776#c1 "Would it not be possible to make worklets and workers completely separate? Decoupling them seems like it would be nice for maintenance since they are going to be fairly different." That probably means that any shared code should be in or near ScriptLoader, rather than in dom/worklers. Jon said in https://bugzilla.mozilla.org/show_bug.cgi?id=1290021#c34 "It would be really great if we could reuse some of the code in the script loader (and would be useful for other efforts, e.g. bug 1308512). This is not trivial unfortunately. I think it would require factoring out the module loader into a separate class with a caller-provided a fetch interface passed in." This would be bug 1311726. Jon said in https://bugzilla.mozilla.org/show_bug.cgi?id=1290021#c40 "As long as the module doesn't import anything you can load it by calling JS::CompileModule to get a module record object, and then calling JS::ModuleDeclarationInstantiation and then JS::ModuleEvaluation on that." Houdini WG said in https://github.com/w3c/css-houdini-drafts/issues/506#issuecomment-343276228 "RESOLVED: dynamic import() in worklets is a no-op that returns a rejected promise (or equivalent after passing thru JS people)" Web platform tests expect static import to work. https://github.com/w3c/css-houdini-drafts/issues/506#issuecomment-342796390

Pushed by ktomlinson@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/f532972750b5 use globalThis in worklet tests because |this| is undefined in toplevel module script r=baku https://hg.mozilla.org/integration/autoland/rev/e67d048b2d11 evaluate worklet scripts as modules without support for nested import r=baku https://hg.mozilla.org/integration/autoland/rev/ba392537f7a9 remove unnecessary JSAutoRealm as realm is set by AutoEntryScript r=baku