Template engine

export class TemplateEngine {
  /**
   * Template engine.
   * @see https://stackoverflow.com/questions/30003353/can-es6-template-literals-be-substituted-at-runtime-or-reused
   * @see https://gist.github.com/tmarshall/31e640e1fa80c597cc5bf78566b1274c
   *
   * @param templateString The template string, e.g "Hello ${name}"
   * @param templateVars Map with variables, e.g { name: "John" }
   * @returns The template string with variables replaced, e.g "Hello John"
   */
  static fillTemplate(templateString: string, templateVars: any): string {
    const handler = new Function(
      'vars',
      [
        'const tagged = ( ' + Object.keys(templateVars).join(', ') + ' ) =>',
        '`' + templateString + '`',
        'return tagged(...Object.values(vars))',
      ].join('\n'),
    );

    return handler(templateVars);
  }
}