Nested export in typescript

Question

Lets say I want to make a library of icons for react+typescript. As for example lets consider only 2 icons in this library: Apple and Banana.

I want to be able to import them separately as the following:

import { Apple } from 'icons'

class MyComponent extends React.Component {
  render() {
    return <Apple/>
  }
}

Now lets consider a case when each icon has its own set of props:

type Props = {}
class Apple extends React.Component<Props> {
}

type Props = {}
class Banana extends React.Component<Props> {
}

Is there a way I can export these props separately through their components? Like this:

import { Apple } from 'icons'

class MyComponent extends React.Component<Apple.Props> {
  render() {
    // passing all the props into the apple
    return <Apple {...this.props}/>
  }
}

I guess you could do something ugly with a namespace Apple { type Props = {} } but I wouldn't recommend it. — Bergi
– Bergi, Commented Dec 26, 2020 at 20:32

98sean98 · Accepted Answer · 2020-12-26 20:25:51Z

2

See answer to similar issue.

Try

import { ComponentProps } from 'react';

class MyComponent extends React.Component<ComponentProps<typeof Apple>> {
  render() {
    return <Apple {...this.props} />
  }
}

Note that this assumes that the imported Apple is a valid react component.

Also consider looking into this typescript cheatsheet for react to have a good grasp of what typescript can do for react.

answered Dec 26, 2020 at 20:25

98sean98

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Comments

juliomalves · Accepted Answer · 2020-12-26 20:28:21Z

1

In addition to exporting the component, you can export the type as well.

export type AppleProps = {}
export class Apple extends React.Component<AppleProps> {
}

You can then use them as:

import { Apple, AppleProps } from 'icons'

answered Dec 26, 2020 at 20:28

juliomalves

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2 Comments

hopeless-programmer Over a year ago

Does it means that I can't access exported props using Apple.Props and forced to make aliases in the root file for all the icons?

juliomalves Over a year ago

Apple.Props does not exist. Unless you explicitly set it, the ideal approach to access the props would be ComponentProps<typeof Apple> as @98sean98 suggested.

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