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The IDL for FileReaderSync no longer includes Service Workers (which the web platform tests FileAPI/historical.https.html confirms). I have a trivial patch for this which passes try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=518fd1aa0bc5e97e0d397d56d51173e74794cfc0
Can you find why? I guess there was a discussion somewhere. It's also important to know what other browsers do. Can you check this too? Thanks.
Sync APIs were deliberately removed from the service worker spec because they can induce network jank, etc. They are a footgun in this kind of worker.
Comment on attachment 8915010 [details] Bug 1405552 - Do not expose FileReaderSync to serviceworkers, to match the spec; https://reviewboard.mozilla.org/r/186278/#review191422 Stealing this. LGTM. Thanks!
BTW, here is the issue where it was removed 2 years ago: https://github.com/w3c/ServiceWorker/issues/735
And this shows that chrome also does not ship FileReaderSync on service worker globals: http://wpt.fyi/FileAPI/historical.https.html
Comment on attachment 8915010 [details] Bug 1405552 - Do not expose FileReaderSync to serviceworkers, to match the spec; https://reviewboard.mozilla.org/r/186278/#review191318 Thomas, can you land this?
I'll try, but I'm swamped lately. At least for starters, I've rebased the patch and am doing a fresh try-run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=55511f0d5cb59c59fdebb1d6bcfc638cc981543a
Well the try-run looks fine, so I might as well request check-in.
We're sorry, Autoland could not rebase your commits for you automatically. Please manually rebase your commits and try again. hg error in cmd: hg rebase -s 448692db508292603ce83514957042363baf71b2 -d 07313b4db1d6: rebasing 462176:448692db5082 "Bug 1405552 - Do not expose FileReaderSync to serviceworkers, to match the spec; r=baku,bkelly" (tip) local [dest] changed testing/web-platform/meta/FileAPI/historical.https.html.ini which other [source] deleted use (c)hanged version, (d)elete, or leave (u)nresolved? u merging dom/serviceworkers/test/test_serviceworker_interfaces.js and dom/workers/test/serviceworkers/test_serviceworker_interfaces.js to dom/serviceworkers/test/test_serviceworker_interfaces.js unresolved conflicts (see hg resolve, then hg rebase --continue)
Ouch, I forgot to publish my rebased patch. Sorry for the churn! Re-requesting checkin.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/82f4604be112 Do not expose FileReaderSync to serviceworkers, to match the spec; r=baku,bkelly
Posted the site compatibility note: https://www.fxsitecompat.com/en-CA/docs/2018/filereadersync-is-no-longer-available-in-service-workers/
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