Leveraging .tsx components within nested .tsx components in React Native

Currently, I am delving into the world of building apps using TypeScript in React Native. Coming from a background as a Swift developer, adjusting to JavaScript and TypeScript has been an interesting journey.

An observation that stood out to me is the challenge of utilizing a component written in a tsx file within another tsx file in the Render method.

//SomeComponent.tsx

export default class SomeComponent extends Component {
    //all my logic
}

//OtherComponent.tsx
export default class ScoreTable extends Component {
    //logic
    render() {

      <SomeComponent style={{flex: 1}}></SomeComponent>
    }
}

This scenario led to the following error message: 

Type '{ style: { flex: number; }; }' is not assignable to type 'IntrinsicAttributes & IntrinsicClassAttributes<SomeComponent> & Readonly<{}> & Readonly<{ children?: ReactNode; }>'.

A quick fix for this issue was switching my tsx SomeComponent to a .js component, but I have grown fond of the tsx syntax. Hence, my question arises: Why can't I integrate .tsx components in other tsx components? Is there an alternative approach?

javascripttypescriptreact-nativereact-tsx

Answer №1

This error issue is certainly perplexing.

What seems to be the underlying problem?

The root cause of this confusion lies in the incorrect specification of the Props type for the SomeComponent. As a result, TypeScript assumes a minimal type definition that does not include a style property.

How can this error be rectified?

To resolve this, it's necessary to add an interface defining the expected props for the SomeComponent, similar to how you would have previously used PropTypes.

//SomeComponent.tsx

interface SomeComponentProps {
    style: React.CSSProperties;
}

export default class SomeComponent extends Component<SomeComponentProps> {
    //all my logic
}

What led to the solution?

Several clues pointed towards the remedy. The initial hint was the 

Type '{ style: { flex: number; }; }'
segment, closely resembling the attributes (or props) associated with the usage of SomeComponent in OtherComponent.tsx. This linked back to the props for SomeComponent.

Furthermore, the error message stating is not assignable to type indicated that TypeScript detected a mismatch between the prop types and what was expected by SomeComponent.

The most puzzling part of the error listed the type as 

'IntrinsicAttributes & IntrinsicClassAttributes<SomeComponent> & Readonly<{}> & Readonly<{ children?: ReactNode; }>'
. Delving into the IntrinsicAttributes within the code base unveiled that it pertained to the basic attribute types anticipated by a component (as found in 
node_modules/@types/react/index.d.ts
, the react type definitions).

By synthesizing these clues with prior knowledge on strengthening the props and state typing of custom react components in TypeScript through the optional generics in React.Component, the ultimate solution emerged.

With this improved understanding, tackling similarly cryptic error messages should become more manageable in the future.

Answer №2

To ensure proper functionality, it is essential to specify style as a property that your SomeComponent can receive:

import React, { Component, CSSProperties } from "react";

interface Props {
  style: CSSProperties;
}

export default class SomeComponent extends Component<Props> {

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