just words about Funcation / eval become my challenge. I'm not going repeat such tricks

sorry for cheating

What a dummy description about emit context? Why just don't show at least one test case?

For others - it requires make possible change context for calling .emit method, and use this context for calling all the handlers.

event.subscribe(function() { console.log('this:', this); });
event.emit.call({name: 'bob'}); // should give `this: { name: bob }`

Hanlding this takes a moment, while realising the task takes an hours

Only after reading comments i understand that i shouldn't use [].revert in js. How can i guess it without comments?