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Why do we use export default in LWC?
The export default keywords export a MyComponent class for other components to use. The class must be the default export for UI components. Exporting other variables or functions in a UI component isn’t currently supported.
What is export default in LWC?
The core module in Lightning Web Components is lwc . You can’t extend any other class to create a Lightning web component. export default class MyComponent extends LightningElement { // Your code here } The export default keywords export a MyComponent class for other components to use.
What is export default used for?
export default is used to export a single class, function or primitive. export default function() { } can be used when the function has no name.
What is export default vs export?
Named exports are useful to export several values. Concerning the default export, there is only a single default export per module. A default export can be a function, a class, an object or anything else. This value is to be considered as the “main” exported value since it will be the simplest to import.
Can you have multiple export default?
You can mix default export and named export. You can’t use export default in multiple export.
What is named export in react?
With named exports, one can have multiple named exports per file. Then import the specific exports they want surrounded in braces. The name of imported module has to be the same as the name of the exported module.
Is export default mandatory?
One is Named Exports and other is Default Exports. Named Exports: Named exports are useful to export several values. During the import, it is mandatory to use the same name of the corresponding object. Using Named and Default Exports at the same time: It is possible to use Named and Default exports in the same file.
When should I use export and export default?
Export and export default can be used to export constants, functions, files and modules. You can import it in other files or modules by import + (constant | function | file | module) name so that it can be used. In a file or module, there can be more than one export and import, and only one export default.
What is import statement in LWC?
The import statement imports LightningElement from the lwc module. import { LightningElement } from ‘lwc’; LightningElement is a custom wrapper of the standard HTML element. Extend LightningElement to create a JavaScript class for a Lightning web component. The class must be the default export for UI components.