Method interpolate

lib/commands/script-loader.js:303–326

* Construct the final version of a file by interpolating its includes in dependency order. * @param file - the file whose content we want to construct * @param processed - a cache to keep track of which includes have already been processed

(file, processed)

   * @param processed - a cache to keep track of which includes have already been processed
   */
  interpolate(file, processed) {
    processed = processed || new Set();
    let content = file.content;
    file.includes.forEach(child => {
      const emitted = processed ? processed.has(child.path) : undefined;
      const fragment = this.interpolate(child, processed);
      const replacement = emitted ? '' : fragment;

      if (!replacement) {
        content = replaceAll(content, child.token, '');
      } else {
        // replace the first instance with the dependency
        content = content.replace(child.token, replacement);
        // remove the rest
        content = replaceAll(content, child.token, '');
      }

      if (processed) {
        processed.add(child.path);
      }
    });

    return content;
  }

  async loadCommand(filename, cache) {
    filename = path.resolve(filename);