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How to use the union.fields function in union

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polkadot-js / api / packages / api-contract / src / MetaRegistry.ts View on Github

function detectedType ({ def, id }: MetaType): MetaTypeInfo {
  assert(!(def as MetaTypeDefUnion)['union.fields'], 'Invalid union type definition found');

  const lookup = def === 'builtin'
    ? builtinMap.find(([test]): boolean => test(id))
    : typeMap.find(([test]): boolean => !!(def as any)[test]);

  return lookup
    ? lookup[1]
    : MetaTypeInfo.Null;
}