CODEWITHSUNDEEP
javascriptecmascript-6babeljscircular-dependencyecmascript-2016
Andrew
Andrew

Reputation: 14526

Circular dependencies in ES6/7

I was surprised to find that in Babel, I could have two modules import each other without any issues. I have found a few places that refer to this as a known and expected behaviour in Babel. I know that this is widely considered an anti-pattern by a lot of (I'm guessing most) people, but please ignore that for this question:

Does anyone know if this is (or will be) correct behaviour in ES6/7?

The closest thing I can find to an official answer (and technical explanation) is this comment on 2ality.com

Upvotes: 13

Views: 5515

Answers (2)

Leo
Leo

Reputation: 13838

It's usually considered bad practices. But ES modules are designed to support cyclic dependencies. There are some information in ES 2017 spec 15.2.1.16.3ResolveExport Concrete Method. However, I think it's really hard to read (to be honest, I suffer a lot). The post you mentioned from 2ality.com might be better readable.

Upvotes: 7

Ludwik
Ludwik

Reputation: 2407

I work with nodeJS, so it's kinda the same. From what I know, "require cycles" are not illegal, even if it's often best to avoid them. If there is a cycle, nodeJS at least will handle that: it will not require the second time.

Upvotes: 2

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