Subscriber called but it "shouldn't"

[ip413]

Every subscriber, subscribed in the same "call stack" as published message, will be called. Although subscription took place after publish.

var ps  = require("pubsub-js");

ps.subscribe("x", () => {console.log("x0")});
ps.publish("x");
ps.subscribe("x", () => {console.log("x1")});
// x0
// x1

This behaviour won't take place if there isn't any subscriber for the same topic already:

var ps  = require("pubsub-js");

ps.publish("x");
ps.subscribe("x", () => {console.log("x1")});

or subscriptions "after publish" will be executed in timeout

var ps  = require("pubsub-js");

ps.subscribe("x", () => {console.log("x0")});
ps.publish("x");
setTimeout(() => {
    ps.subscribe("x", () => {console.log("x1")})
}, 0);

The problem could be solved by checking subscribers to call (during publish) not after timeout, but before.

[curiousercreative]

This appears to have some overlap with this older issue: #59

[ip413]

Yep, this is the same thing.