Bug: [PPR] Resume failed when "moduleLoading === undefined" in function prepareDestinationWithChunks

[gaoachao]

React version:
experimental

Steps To Reproduce

const serverResponse = createFromReadableStream(renderStream, {
  ssrManifest: {
    moduleMap: ssrModuleMapping,
    // This way can also solve the error
    // moduleLoading: null,
  },
});
// Both prerender and resume faild when ssrManifest.moduleLoading === undefined
// <Root /> comes from serverResponse 
const { prelude, postponed } = await prerenderToNodeStream(
  <Root />,
  prerenderOptions
);
const { pipe } = await resumeToPipeableStream(
  <Root />,
  postponed,
  resumeOptions
);

Link to code example:

The current behavior

TypeError: Cannot read properties of undefined (reading 'prefix') at prepareDestinationWithChunks

export function prepareDestinationWithChunks(
  moduleLoading: ModuleLoading,
  // Chunks are double-indexed [..., idx, filenamex, idy, filenamey, ...]
  chunks: Array<string>,
  nonce: ?string,
) {
  if (moduleLoading !== null) {
    for (let i = 1; i < chunks.length; i += 2) {
      preinitScriptForSSR(
        moduleLoading.prefix + chunks[i],
        nonce,
        moduleLoading.crossOrigin,
      );
    }
  }
}

The expected behavior

// In fact, this is not a bug in the general sense, but it may make prepareDestinationWithChunks more rigorous.
export function prepareDestinationWithChunks(
  moduleLoading: ModuleLoading,
  // Chunks are double-indexed [..., idx, filenamex, idy, filenamey, ...]
  chunks: Array<string>,
  nonce: ?string
) {
  // or if (moduleLoading) {}
  if (moduleLoading !== null && moduleLoading !== undefined) {
    for (let i = 1; i < chunks.length; i += 2) {
      preinitScriptForSSR(
        moduleLoading.prefix + chunks[i],
        nonce,
        moduleLoading.crossOrigin
      );
    }
  }
}

[github-actions]

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[github-actions]

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