react leaflet Module parse failed: Unexpected token (10:39)

Question

Failed to compile.

./node_modules/@react-leaflet/core/lib/path.js 10:39
Module parse failed: Unexpected token (10:39) You may need an appropriate loader to handle this file type. | useEffect(function updatePathOptions() { | if (props.pathOptions.== optionsRef.current) {

 var options = props.pathOptions?? {};

| element.instance.setStyle(options); | optionsRef.current = options;

Answer 1

I had the same problem. After some research, I found the below answers, which helped me fix them.

• react-leaflet issues
• create-react-app issues

1. First, check if your react version matches "react-leaflet" version.
   • For example in "react-leaflet" version 4.x, React v18 and Leaflet v1.8 are now required as peer dependency. ref.
2. Update browserslist in package.json to this:

...    
    "browserslist": [
       ">0.2%",
      "not dead",
      "not op_mini all"
    ],
...

3. Delete .cache directory in node_modules and start over.