Importing TypeScript enums into a Vue or browser context can lead to errors or the need for additional dependencies

I'm encountering a problem when trying to import type definitions from a separate module in my Vue project.

Below is the structure of the typedefs I am attempting to import:

import { Server, createServer } from "net";

export namespace Testable {
  export interface t {
    1: string,
    apple: boolean
  }

  export const enum b {
    butter,
    fly,
    moth
  }

  export class apple extends Server {

  }
}

While I can successfully import the namespace Testable and use the interface t, I encounter errors when trying to utilize the enum b within Vue/webpack environment.

TypeError: Super expression must either be null or a function

The code provided is just a sample. However, when working with the live code that includes a database class, Vue/webpack indicates missing dependencies like cldr, dns, and others:

 ERROR  Failed to compile with 21 errors                                                                                                                               2:00:58 PM

These dependencies were not found:

* cldr in ./node_modules/globalize/dist/globalize.js, ./node_modules/globalize/dist/globalize/message.js and 6 others
* cldr/event in ./node_modules/globalize/dist/globalize.js, ./node_modules/globalize/dist/globalize/message.js and 5 others
* cldr/supplemental in ./node_modules/globalize/dist/globalize/relative-time.js, ./node_modules/globalize/dist/globalize/plural.js and 3 others
* handlebars in ./node_modules/......

To clarify, my main goal is to import the enum without utilizing the nodejs class for browser execution.

Any assistance on resolving this issue would be highly valued! Additionally, suggestions for restructuring my project for better organization are welcome!

Answer №1

Upon compilation, the module will appear as:

export var Testable;
(function (Testable) {
    class apple extends Server {
    }
    Testable.apple = apple;
})(Testable || (Testable = {}));

The concept of namespace is demonstrated through an IIFE which leads to a side effect where the entire module is evaluated during import.

In ES6, TypeScript namespaces are unnecessary as ES modules already serve as effective namespaces.

Optimizing tree shaking becomes possible by avoiding the use of namespaces. It's important for Webpack to recognize the module as side effect-free to enhance its tree shaking capabilities. The effectiveness of Webpack's tree shaking feature depends on how the application is constructed, potentially resulting in evaluation of unused code like class apple extends Server .... It's worth noting that in certain scenarios, such as when the minifier is disabled during development, usedExports tree shaking may not be as efficient.

To address this issue, it is advisable not to solely rely on tree shaking and instead maintain types in distinct modules, enabling direct imports when needed.

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