### Website or app

https://github.com/facebook/react/tree/main/packages/react-devtools-extensions

### Repro steps

Follow the instructions here to build local version of react devtools extension: https://github.com/facebook/react/tree/main/packages/react-devtools-extensions

```
git clone https://github.com/facebook/react.git 
cd react
yarn install
yarn build-for-devtools
```

Stuck on this step everytime `yarn build-for-devtools`:
```
D:\Other\react\node_modules\flow-parser\flow_parser.js:807
throw a}function
^

Error: SignedSource.signFile(...): Cannot sign file without token: <<SignedSource::*O*zOeWoEQle#+L!plEphiEmie@IsG>>
    at Object.<anonymous> (D:\Other\react\node_modules\signedsource\index.js:20:28)
    at Module._compile (node:internal/modules/cjs/loader:1196:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1250:10)
    at Module.load (node:internal/modules/cjs/loader:1074:32)
    at Function.Module._load (node:internal/modules/cjs/loader:909:12)
    at Module.require (node:internal/modules/cjs/loader:1098:19)
    at require (node:internal/modules/cjs/helpers:108:18)
    at Object.<anonymous> (D:\Other\react\scripts\rollup\packaging.js:18:37)
    at Module._compile (node:internal/modules/cjs/loader:1196:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1250:10)
```

Is there anything else I need to set up in order to make this work?

### How often does this bug happen?

Every time

### DevTools package (automated)

_No response_

### DevTools version (automated)

_No response_

### Error message (automated)

_No response_

### Error call stack (automated)

_No response_

### Error component stack (automated)

_No response_

### GitHub query string (automated)

_No response_
case FB_WWW_DEV:
    case FB_WWW_PROD:
    case FB_WWW_PROFILING:
      return `build/facebook-www/${filename}`;
    case RN_OSS_DEV:
    case RN_OSS_PROD:
    case RN_OSS_PROFILING:
      switch (packageName) {
        case 'react-native-renderer':
          return `build/react-native/implementations/${filename}`;
        default:
          throw new Error('Unknown RN package.');
      }
    case RN_FB_DEV:
    case RN_FB_PROD:
    case RN_FB_PROFILING:
      switch (packageName) {
        case 'scheduler':
        case 'react':
        case 'react-is':
        case 'react-test-renderer':
          return `build/facebook-react-native/${packageName}/cjs/${filename}`;
        case 'react-native-renderer':
          return `build/react-native/implementations/${filename.replace(
            /\.js$/,
            '.fb.js'
          )}`;
        case 'react-server-native-relay':
          return `build/facebook-relay/flight/${filename}`;
        default: