code: function defaultInstructions (format) {
    // start with empty instructions
    let instructions = emptyInstructions('_defaults', format);
  
    // extend with the default recipe, if it exists for the target extension
    const recipeFilePath = path.join(
      __dirname,
      '..',
      '_defaults',
      `recipe.${format}.json`
    );
    if (fs.existsSync(recipeFilePath)) {
      instructions = Object.assign(
        instructions,
        JSON.parse(fs.readFileSync(recipeFilePath, 'utf8'))
      );
    }
    return instructions;
  }
docs: default recipe instruction