When implementing react-transition-group, I encountered the error message "TS7017: Element implicitly has an 'any' type and no index signature."

Check out my code snippet below:

 renderSoundWave = () => {
    const defaultStyle = {
      opacity: 1,
      transition: `opacity ${DURATION}ms ease-in-out`,
    }

    const transitionStyles = {
      entering: { opacity: 1 },
      entered:  { opacity: 0 },
    };
    return (

    <Transition timeout={DURATION} in={this.animate}>
      {(state) => (
        <div className={styles.soundWaves}
             style={{ ...defaultStyle, ...transitionStyles[state]}}> {/* Issue occurs here! */
          <SoundWaves/>
        </div>
        )}
    </Transition>
      );
  }

The goal is to utilize Transition from the library react-transition-group for animating the icon SoundWave.

Despite this intention, an error has surfaced:

Error TS7017: Element implicitly has an 'any' type due to lack of index signature in type '{entering: {opacity: number;}; entered: {opacity: number;};}'.

This error specifically references ...transitionStyles[state] mentioned above

I'm puzzled by the occurrence of this error. What could be triggering this type mismatch?

Answer №1

After some troubleshooting, I managed to resolve the issue by updating transitionStyles to:

const animationProperties: { [key: string]: CSSStyleDeclaration } = {
  start: { opacity: 1 },
  end:  { opacity: 0 },
};

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