Seems counter intuitive for some use-cases. */ constructor ( id : number ) from "./spotify-client-class"Īs Spotify.initialize() returns a Promise to refer to the class across other ES modules we need to initialise another instance of the class. * drive the state transitions forward until the class is * The `constructor` merely constructs the initial state # name : string | null /** Here, we cache the ID for later usage.
* This encodes the "pending" state at the type-level. * Observe that the field may now be `undefined`. Suppose we have a Person class with a private string field name: Most notably, returning a non-primitive value from a constructor returns that value instead of the constructed this object. However, this does have the consequence that the constructor inherits some of the quirky behavior and semantics of the old constructors. When classes finally arrived, the constructor was (more or less) syntactic sugar over the plain old constructor functions. Instead, JavaScript "constructors" were simply plain old functions with a close relationship with this and prototype. Once we've established the shortcomings, I will demonstrate what I have found to be the proper async constructor pattern in JavaScript.īefore ES6, there was no concept of classes in the language specification. In this article, we will discuss the limitations of the various ways we've attempted to emulate async constructors. but most of them are quite unidiomatic (to say the least).
However, for the time being, there are some workarounds. Before anyone rushes into the comments section, I must preface this article by emphasizing that there is no standardized way to write asynchronous constructors in JavaScript yet.
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