How Can I Best Export and Import Multiple Methods in ES6 Modules?

ES6 Modules: Exporting Multiple Methods

ES6 modules provide several options for exporting multiple methods, with potential implications for code readability and performance. Here's a breakdown of the available approaches:

Single Class of Static Methods

Exporting a class containing exclusively static methods may create a code smell. Instead, consider using a module object:

// myMethods.js
export default {
  myMethod1() { console.log('foo'); },
  myMethod2() { console.log('bar'); }
};

Multiple Exported Methods

Using named exports allows you to explicitly indicate which methods should be exported:

// myMethods.js
export function myMethod1() { console.log('foo'); }
export function myMethod2() { console.log('bar'); }

Alternatively, you can use the wildcard export syntax (* as), which exports the entire module object under a single alias:

// myMethods.js
export * as myMethods;

Importing Methods

When importing methods, the preferred approach depends on personal preference and the code context.

1. Using {myMethod1, myMethod2} syntax:

   • Provides direct references to the exported methods.
   • Requires explicit import of each method used.

2. Using * as myMethods syntax:

   • Imports the entire module object as an alias.
   • Allows dot notation for referencing both module and methods (e.g., myMethods.myMethod1()).

Performance Implications

There are minimal performance differences between the approaches. Static identifiers (as with named exports) can be resolved more quickly than property accesses (as with wildcard imports). However, the impact is negligible in real-world applications.

Ultimately, the choice between these methods should be based on code maintainability and readability, rather than performance concerns.

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