2024 06 14 chat typescript error in react component output due to ref - bizkite-co/handterm GitHub Wiki

original file name: Codeium Chat - g3FS5HedKQSpB2F86ClbaOMJgk9t1JvR.md summary: The chat conversation revolves around a TypeScript error in a React component called Output. The initial problem is the assignment error involving the ref property not being recognized in the OutputProps interface. The suggested solution involves using React.forwardRef to properly handle the ref attribute separately.

Later in the conversation, the user provides their attempted code but encounters another error related to the mismatch of ref types (ForwardedRef<HTMLElement> vs. HTMLDivElement). The final solution involves refining the Output component to expect a HTMLDivElement ref, ensuring the correct alignment of types and resolving the TypeScript error. date: 2024-06-14T07:18

Codeium Chat Conversation

Note: This is purely the output of the chat conversation and does not contain any raw data, codebase snippets, etc. used to generate the output.

User at 7:18 am, Jun 14, 2024

Explain problem: Type '{ ref: RefObject<HTMLElement>; elements: ReactNode[]; onTouchStart: TouchEventHandler<HTMLElement>; onTouchEnd: TouchEventHandler<...>; }' is not assignable to type 'IntrinsicAttributes & OutputProps'. Property 'ref' does not exist on type 'IntrinsicAttributes & OutputProps'.

Codeium at 7:18 am, Jun 14, 2024

The error message you're encountering indicates that the ref attribute you're trying to use in the Output component is not recognized as a valid attribute for that component. This is because the ref attribute is not part of the IntrinsicAttributes & OutputProps type expected by the Output component.

To resolve this, you can either modify the OutputProps type to include the ref attribute or use a different approach to handle the reference to the Output component.

One common approach is to use the forwardRef function to forward the ref to a DOM element within the Output component. This way, the ref is not passed directly to the component but is accessible within the component to be attached to a DOM element.

Here's an example of how you can use forwardRef in your Output component:

const Output = React.forwardRef((props: OutputProps, ref: React.Ref<HTMLElement>) => {
  // Your component logic here
  return (
    <div ref={ref}>
      {/* Render your output elements */}
    </div>
  );
});

By using forwardRef, you can pass the ref attribute correctly without causing TypeScript errors related to type incompatibility.

User at 7:25 am, Jun 14, 2024

I think I might have this wrong.

// src/components/Output.tsx

import React, { TouchEventHandler } from "react";
import { TerminalCssClasses } from "../types/TerminalTypes";


 export interface OutputProps {
  elements: React.ReactNode[];
  onTouchStart: TouchEventHandler<HTMLDivElement>;
  onTouchEnd: TouchEventHandler<HTMLDivElement>; 
  ref: React.Ref<HTMLElement>;
}

export const Output: React.FC<OutputProps> = React.forwardRef(({ elements, ...props}) => {
  return (
    <div
      id={TerminalCssClasses.Output}
      className={TerminalCssClasses.Output}
      onTouchStart={props.onTouchStart}
      onTouchEnd={props.onTouchEnd}
      ref={ref}
    >
      {elements.map((element, index) => {
        if (typeof element === 'string') {
          // Only use dangerouslySetInnerHTML for string values
          return <div key={index} dangerouslySetInnerHTML={{ __html: element }} />;
        } else {
          // For non-string ReactNode elements, render them directly
          return <div key={index}>{element}</div>;
        }
      })}
    </div>
  );
});

Codeium at 7:25 am, Jun 14, 2024

The issue arises from the incorrect usage of ref in the OutputProps interface and the Output component. The ref should not be declared directly in the props interface because forwardRef handles it separately.

Here's how you should define the Output component using forwardRef:

// src/components/Output.tsx

import React, { TouchEventHandler } from "react";
import { TerminalCssClasses } from "../types/TerminalTypes";

export interface OutputProps {
  elements: React.ReactNode[];
  onTouchStart: TouchEventHandler<HTMLDivElement>;
  onTouchEnd: TouchEventHandler<HTMLDivElement>;
}

export const Output = React.forwardRef<HTMLElement, OutputProps>(({ elements, onTouchStart, onTouchEnd }, ref) => {
  return (
    <div
      id={TerminalCssClasses.Output}
      className={TerminalCssClasses.Output}
      onTouchStart={onTouchStart}
      onTouchEnd={onTouchEnd}
      ref={ref}
    >
      {elements.map((element, index) => {
        if (typeof element === 'string') {
          return <div key={index} dangerouslySetInnerHTML={{ __html: element }} />;
        } else {
          return <div key={index}>{element}</div>;
        }
      })}
    </div>
  );
});

In this code:

  • I removed the ref declaration from OutputProps.
  • I changed React.FC<OutputProps> to React.forwardRef<HTMLElement, OutputProps> to correctly type the forwarded ref as an HTMLElement and the props as OutputProps.
  • I destructured onTouchStart and onTouchEnd directly from the props for clarity.

Now, TypeScript understands that Output is a component that forwards a ref and expects OutputProps without the ref property.

User at 7:40 am, Jun 14, 2024

I had to change it to HTMLDivElement becaue I was getting this:

Type 'ForwardedRef<HTMLElement>' is not assignable to type 'LegacyRef<HTMLDivElement> | undefined'.
  Type 'MutableRefObject<HTMLElement | null>' is not assignable to type 'LegacyRef<HTMLDivElement> | undefined'.
    Type 'MutableRefObject<HTMLElement | null>' is not assignable to type 'RefObject<HTMLDivElement>'.
      Types of property 'current' are incompatible.
        Type 'HTMLElement | null' is not assignable to type 'HTMLDivElement | null'.
          Property 'align' is missing in type 'HTMLElement' but required in type 'HTMLDivElement'.ts(2322)

Codeium at 7:40 am, Jun 14, 2024

The error you encountered suggests that there is a mismatch between the type of ref that Output expects (HTMLElement) and the type of ref that you should actually pass (HTMLDivElement). Since Output is rendering a div element, the ref should be typed as HTMLDivElement.

Here is the corrected Output component with forwardRef properly typed as HTMLDivElement:

// src/components/Output.tsx

import React, { TouchEventHandler } from "react";
import { TerminalCssClasses } from "../types/TerminalTypes";

export interface OutputProps {
  elements: React.ReactNode[];
  onTouchStart: TouchEventHandler<HTMLDivElement>;
  onTouchEnd: TouchEventHandler<HTMLDivElement>;
}

export const Output = React.forwardRef<HTMLDivElement, OutputProps>(
  ({ elements, onTouchStart, onTouchEnd }, ref) => {
    return (
      <div
        id={TerminalCssClasses.Output}
        className={TerminalCssClasses.Output}
        onTouchStart={onTouchStart}
        onTouchEnd={onTouchEnd}
        ref={ref} // ref is now correctly typed as HTMLDivElement
      >
        {elements.map((element, index) => {
          if (typeof element === 'string') {
            // Only use dangerouslySetInnerHTML for string values
            return <div key={index} dangerouslySetInnerHTML={{ __html: element }} />;
          } else {
            // For non-string ReactNode elements, render them directly
            return <div key={index}>{element}</div>;
          }
        })}
      </div>
    );
  }
);

Now, the ref passed to the Output component should be a ref object of type RefObject<HTMLDivElement>, which will match the type of the DOM element it's being attached to (HTMLDivElement).

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