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ESLint plugin for preventing memory leaks around observers (ResizeObserver, IntersectionObserver, MutationObserver)

TypeScript 43.75% JavaScript 56.25%
eslint memory-leak observers

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eslint-plugin-observers's Issues

Throw error when the observer is assigned to another const or property in Component

Summary

When you create the observer in a variable and later on assign it to another variable or property, the eslint rule doesn't recognize that the second variable contains the observer and doesn't take into account the unobserve or disconnect executed by the second variable or property.

Code to reproduce

    class MyComponent extends React.Component {
      resizeObserver = null;
      resizeElement = createRef();
    
      componentDidMount() {
        const temp = new ResizeObserver((entries) => {
          // do things
        });

        temp.observe(this.resizeElement.current);
        this.resizeObserver = temp
      }
    
      componentWillUnmount() {
        if (this.resizeObserver) {
          this.resizeObserver.unobserve(this.resizeElement.current);
        }
      }
    
      render() {
        return (
          <div ref={this.resizeElement}>
            ...
          </div>
        );
      }
    }

Error:

temp does not have a corresponding Unobserve or Disconnnect

Expected

It shouldn't throw the error

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