This change swaps the order so that Backburner will use Promises first then fallback to MutationObserver if Promise is not present (cough IE11 cough).
This makes debugging a bit nicer since it shows "Promise.then (async)" instead of "character data (async)"), and also ensures that we can more consistently target the right microtask queue.
This is the result of a longer debugging session where @stefanpenner (and I) determined that there is a difference between Safari and Chrome in how mutation observer microtasks and promise microtasks are queued.
lynchbomb
commented
5 years ago
This change swaps the order so that Backburner will use Promises first then fallback to
MutationObserverifPromiseis not present (cough IE11 cough).This makes debugging a bit nicer since it shows
"Promise.then (async)"instead of"character data (async)"), and also ensures that we can more consistently target the right microtask queue.This is the result of a longer debugging session where @stefanpenner (and I) determined that there is a difference between Safari and Chrome in how mutation observer microtasks and promise microtasks are queued.