The default priorityMethods in mapStateOnServer had toComponent: () => {} — an empty function body that implicitly returns undefined, violating the HelmetDatum interface contract of toComponent(): React.ReactElement[].

Changes

• src/server.ts: Change the default toComponent fallback to explicitly return an empty array, matching the HelmetDatum type:

// Before — returns undefined, violates HelmetDatum interface
let priorityMethods = {
  toComponent: () => {},
  toString: () => '',
};

// After — returns React.ReactElement[] as required
let priorityMethods = {
  toComponent: (): React.ReactElement[] => [],
  toString: () => '',
};

This ensures helmet.priority.toComponent() is always safe to call (e.g. spread into JSX) regardless of whether prioritizeSeoTags is enabled.

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