What are the drawbacks of combining exports through re-exporting in TypeScript?

Lately in TypeScript discussions, there seems to be a negative viewpoint on namespace BAD. However, I see value in organizing related declarations within a single namespace, similar to a library, to avoid excessive import statements.

I have come across the feature of using as in imports for namespacing, like this:

import * as NS from '../some/module'

But I find this approach cumbersome and potentially messy if any refactoring is needed for NS (as shown above).

So, I have devised a strategy as outlined below. But I can't shake off the feeling that it might be considered hackish, with potential unforeseen consequences that I am not aware of.

Assuming the following folder structure

.
└── doc
    ├── doc.ts
    ├── impl.ts
    ├── exports.ts
    └── index.ts

doc.ts

export enum Type {
  A = "A",
  B = "B"
}
export interface IDoc {
  type: Type;
}

impl.ts

import { IDoc, Type } from "./doc";

export class Impl implements IDoc {
  constructor(public type: Type) {                      
  }
}

exports.ts exports everything

export * from "./impl";
export * from "./doc";

index.ts then re-exports 'exports' as Doc:

import * as Doc from "./exports";
export { Doc };

This allows for a consistent single import, for example:

import { Doc } from "../core/doc";

export class SomeClass {
  doc: Doc.IDoc;
  constructor(type: Doc.Type) {
    this.doc = new Doc.Impl(type);
  }
}

Are there any downsides to this strategy? Is there a best practice or pattern that I may be overlooking?

Answer №1

Are you neglecting the use of a namespace? This method is commonly referred to as barrelling.

A namespace is typically integrated into the programming language and serves as a unique identifier for a collection of "blueprints" such as classes, interfaces, etc...

On the contrary, what you are practicing is called barrelling. Barrelling involves packaging multiple exported members into a single import. While this can be a useful technique recommended by some, it may also result in issues like circular dependencies. Circular dependencies occur when two or more modules rely on each other directly or indirectly to function properly.

It's essential to exercise caution when employing barrelling. Alternatively, consider importing only what is necessary in each file to avoid circular dependencies altogether.

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