Question

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How can I export a stateless pure dumb component?

If I use class this works:

import React, { Component } from 'react';

export default class Header extends Component {
    render(){
        return <pre>Header</pre>
    }
}

However if I use a pure function I cannot get it to work.

import React, { Component } from 'react';
export default const Header = () => {
    return <pre>Header</pre>
}

Am I missing something basic?

over 4 years ago · Santiago Trujillo

Just as a side note. You could technically export default without declaring a variable first.

export default () => (
  <pre>Header</pre>
)

over 4 years ago · Santiago Trujillo Relatório

you can do it in two ways

const ComponentA = props => {
  return <div>{props.header}</div>;
};

export default ComponentA;

2)

export const ComponentA = props => {
  return <div>{props.header}</div>;
};

if we use default to export then we import like this

import ComponentA from '../shared/componentA'

if we don't use default to export then we import like this

import { ComponentA } from '../shared/componentA'

over 4 years ago · Santiago Trujillo Relatório

Responde à pergunta

Accepted Answer · 2022-05-25T13:51:13.620Z

ES6 doesn't allow export default const. You must declare the constant first then export it:

const Header = () => {
  return <pre>Header</pre>
};
export default Header;

This constraint exists to avoid writting export default a, b, c; that is forbidden: only one variable can be exported as default