No ticket. Update packages, make the devDependencies list alphabetic. (cherry-picked from 3f3a6c5ff5e6f1565ff4ad672ad44f71ad765f29)
Fix #13983. Switch to //# for sourcemap directives. (cherry-picked from dfaee326e6605dc6d848c4c5022e39069d2cee65)
WIP. Fix #10814. Fix #14084. Make support tests lazy and broken out to components.