What is the reason behind the prevalence of using export class xxx in angular4 projects instead of export default class xxx?

Understanding the distinction between export class xxx and export default class xxx is crucial.

However, I've noticed that numerous angular4 projects utilize export class xxx in this manner:

@Component({
  selector: 'call-record',
  templateUrl: './collection.component.html',
  styleUrls: ['./collection.component.css']
})
export class collection {

}

Perhaps using export default xxx would be more appropriate if there is only one class or item to export?

This way, I could import it like so: import xxx from './somewhere'

instead of: import {xxx} from './somewhere'.

Answer №1

Challenges related to maintainability:

  • Modifying xxx in the somewhere module may not update it in the file importing the module.

  • To include more information (such as types, interfaces, constants) when exporting from a file, you must use

    export { ConcreteClass, SomeType, ISomeInterface, SomeConstant}
    .

  • Difficulty in identifying default exports and distinguishing if a module has one.

  • Lack of support for automatic code completion in Editors/IDEs.

  • Rename default exports when using CommonJs like

    const {default} = require('./somewhere')
    .

  • Reduce spelling errors by using import Foo from './foo' instead of import foo from'./foo'.

Considering these factors, it is advisable to avoid default exports.

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