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If there is more than one\n * fragment, but a `fragmentName` was not defined then an error will be thrown.\n */\nexport function getFragmentQueryDocument(\n  document: DocumentNode,\n  fragmentName?: string\n): DocumentNode {\n  let actualFragmentName = fragmentName;\n\n  // Build an array of all our fragment definitions that will be used for\n  // validations. We also do some validations on the other definitions in the\n  // document while building this list.\n  const fragments: Array<FragmentDefinitionNode> = [];\n  document.definitions.forEach((definition) => {\n    // Throw an error if we encounter an operation definition because we will\n    // define our own operation definition later on.\n    if (definition.kind === \"OperationDefinition\") {\n      throw newInvariantError(\n        `Found a %s operation%s. ` +\n          \"No operations are allowed when using a fragment as a query. Only fragments are allowed.\",\n        definition.operation,\n        definition.name ? ` named '${definition.name.value}'` : \"\"\n      );\n    }\n    // Add our definition to the fragments array if it is a fragment\n    // definition.\n    if (definition.kind === \"FragmentDefinition\") {\n      fragments.push(definition);\n    }\n  });\n\n  // If the user did not give us a fragment name then let us try to get a\n  // name from a single fragment in the definition.\n  if (typeof actualFragmentName === \"undefined\") {\n    invariant(\n      fragments.length === 1,\n      `Found %s fragments. \\`fragmentName\\` must be provided when there is not exactly 1 fragment.`,\n      fragments.length\n    );\n    actualFragmentName = fragments[0].name.value;\n  }\n\n  // Generate a query document with an operation that simply spreads the\n  // fragment inside of it.\n  const query: DocumentNode = {\n    ...document,\n    definitions: [\n      {\n        kind: \"OperationDefinition\" as Kind,\n        // OperationTypeNode is an enum\n        operation: \"query\" as OperationTypeNode,\n        selectionSet: {\n          kind: \"SelectionSet\" as Kind,\n          selections: [\n            {\n              kind: \"FragmentSpread\" as Kind,\n              name: {\n                kind: \"Name\" as Kind,\n                value: actualFragmentName,\n              },\n            },\n          ],\n        },\n      },\n      ...document.definitions,\n    ],\n  };\n\n  return query;\n}\n\n/**\n * This is an interface that describes a map from fragment names to fragment definitions.\n */\nexport interface FragmentMap {\n  [fragmentName: string]: FragmentDefinitionNode;\n}\n\nexport type FragmentMapFunction = (\n  fragmentName: string\n) => FragmentDefinitionNode | null;\n\n// Utility function that takes a list of fragment definitions and makes a hash out of them\n// that maps the name of the fragment to the fragment definition.\nexport function createFragmentMap(\n  fragments: FragmentDefinitionNode[] = []\n): FragmentMap {\n  const symTable: FragmentMap = {};\n  fragments.forEach((fragment) => {\n    symTable[fragment.name.value] = fragment;\n  });\n  return symTable;\n}\n\nexport function getFragmentFromSelection(\n  selection: SelectionNode,\n  fragmentMap?: FragmentMap | FragmentMapFunction\n): InlineFragmentNode | FragmentDefinitionNode | null {\n  switch (selection.kind) {\n    case \"InlineFragment\":\n      return selection;\n    case \"FragmentSpread\": {\n      const fragmentName = selection.name.value;\n      if (typeof fragmentMap === \"function\") {\n        return fragmentMap(fragmentName);\n      }\n      const fragment = fragmentMap && fragmentMap[fragmentName];\n      invariant(fragment, `No fragment named %s`, fragmentName);\n      return fragment || null;\n    }\n    default:\n      return null;\n  }\n}\n"]}