Can I know when all reactions for the current transaction have run?

[rickmed]

Like a hook or notification?

[urugator]

https://mobx.js.org/configuration.html#reactionscheduler-f---void--void

configure({
    reactionScheduler: (runReactions): void => {
        console.log("before");
        runReactions();
        console.log("after");
    }
})

[rickmed]

I could also wrap all functions that wrapped in actions so that when they're are finished I can run some code right? (ie, actions are synchronous)

[urugator]

Yes, but keep in mind that only the outermost action counts, so you either have to keep this wrapper at the "boundary" or it should also support nesting. Just in case, you can get the action's nesting counter as mobx._getGlobalState().inBatch

mobx/packages/mobx/src/core/globalstate.ts

Line 64 in f0e066f

inBatch: number = 0