How to access koa context in another generator function?

Question

In Koa I can accesss a Koa Context in the first generator function via this:

app.use(function *(){
    this; // is the Context
}

But if I yield to another generator function I can't access the context via this anymore.

app.use(function *(){
    yield myGenerator();
}

function* myGenerator() {
    this.request; // is undefined
}

I've been able to simply pass the context to the second generator function, but was wondering whether there's a cleaner way to access the context.

Any ideas?

Answer 1

Either pass this as an argument as you said:

app.use(function *(){
    yield myGenerator(this);
});

function *myGenerator(context) {
    context.request;
}

or use apply():

app.use(function *(){
    yield myGenerator.apply(this);
});

function *myGenerator() {
    this.request;
}