text: const path = require('path')
  const url = require('url')
  
  /**
   * Convert file path to file URL adding default file name if missing.
   *
   * @param  {string} basePath - Path to generate location for.
   * @param  {string} ext - Generated location document extension.
   * @return {string} Generated location with "file://" prefix.
   */
  function basePathToURL (basePath, ext) {
    if (!basePath.endsWith(`.${ext}`)) {
      basePath = path.join(basePath, `basepath_default_doc.${ext}`)
    }
    return url.pathToFileURL(basePath.replace(/\\/g, '/')).href
  }
  
  /**
   * Validates draft version.
   *
   * @param  {string} draft - Output JSON Schema draft version.
   * throws {Error} If specified draft is not supported.
   */
  function validateDraft (draft) {
    const supportedDrafts = ['04', '06', '07']
    if (supportedDrafts.indexOf(draft) < 0) {
      throw new Error(
        `Unsupported draft version. Supported versions are: ${supportedDrafts}`)
    }
  }
  
  module.exports = {
    basePathToURL: basePathToURL,
    validateDraft: validateDraft,
    DEFAULT_DRAFT: '07'
  }
  