Method fileExt

src/modules/system/index.ts:175–191

* Returns a file extension. * * @param mimeType Valid [mime-type](https://github.com/jshttp/mime-db/blob/master/db.json) * * @example * faker.system.fileExt() // 'emf' * faker.system.fileExt('application/json') // 'json' * * @since 3.1.0

(mimeType?: string)

   * @since 3.1.0
   */
  fileExt(mimeType?: string): string {
    const mimeTypes = this.faker.definitions.system.mime_type;

    if (typeof mimeType === 'string') {
      const entry = mimeTypes[mimeType];
      if (entry == null) {
        throw new FakerError(`MIME type ${mimeType} is not supported.`);
      }

      return this.faker.helpers.arrayElement(entry.extensions);
    }

    const extensionSet = new Set(
      Object.values(mimeTypes).flatMap(({ extensions }) => extensions)
    );
    return this.faker.helpers.arrayElement([...extensionSet]);
  }

  /**
   * Returns a directory path.