flattenFilePath.js

const flattenFilePath = (pathPart, directoryOrFileContents) => {
  return Object.entries(directoryOrFileContents).reduce((flattenedFilePaths, [key, value]) => {
    if (typeof value === "object") {
      Object.assign(flattenedFilePaths, flattenFilePath(`${pathPart}/${key}`, value))
    } else {
      flattenedFilePaths[`${pathPart}/${key}`] = value
    }

    return flattenedFilePaths
  }, {})
}