/**
 * Add a new field to the data from an external source by matching on the same field name
 * @param data The data to add the new field to
 * @param externalSource The external source to get the new field from
 * @param externalSourceFieldName The field in both data and external source to match on
 * @param newFieldName The name of the new field to add
 * @param defaultValue The default value to use if there is no match
 */
export declare const addNewFieldFromExternalSource: (data: Record<string, string>[], externalSource: Record<string, string>[], externalSourceFieldName: string, newFieldName: string, defaultValue?: string) => Record<string, string>[];
/**
 * Add a new field to the data from an external source by matching on different field names
 * @param data The data to add the new field to
 * @param externalSource The external source to get the new field from
 * @param lookupField The field in the external source to match on
 * @param currentField The field in the current data to match on
 * @param newFieldName The name of the new field to add
 * @param defaultValue The default value to use if there is no match
 */
export declare const addNewFieldFromLookupField: (data: Record<string, string>[], externalSource: Record<string, string>[], lookupField: string, currentField: string, newFieldName: string, defaultValue?: string) => Record<string, string>[];
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