Viewing github.com/facebook/react/packages/react-devtools-extensions/src/contentScripts/fileFetcher.js

```
/* global chrome */
```
```
function fetchResource(url) {
```
```
  const reject = value => {
```
```
    chrome.runtime.sendMessage({
```

      source: 'react-devtools-fetch-resource-content-script',

```
      payload: {
```

        type: 'fetch-file-with-cache-error',

```
        url,
```
```
        value,
```
```
      },
```
```
    });
```
```
  };
```
```
  const resolve = value => {
```
```
    chrome.runtime.sendMessage({
```

      source: 'react-devtools-fetch-resource-content-script',

```
      payload: {
```

        type: 'fetch-file-with-cache-complete',

```
        url,
```
```
        value,
```
```
      },
```
```
    });
```
```
  };
```

  fetch(url, {cache: 'force-cache'}).then(

```
    response => {
```
```
      if (response.ok) {
```
```
        response
```
```
          .text()
```
```
          .then(text => resolve(text))
```

          .catch(error => reject(null));

```
      } else {
```
```
        reject(null);
```
```
      }
```
```
    },
```
```
    error => reject(null),
```
```
  );
```
```
}
```

chrome.runtime.onMessage.addListener(message => {

```
  if (
```

    message?.source === 'devtools-page' &&

    message?.payload?.type === 'fetch-file-with-cache'

```
  ) {
```

    fetchResource(message.payload.url);

```
  }
```
```
});
```

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