Function add

out/cli.cjs:1808–1818

(source)

      Array.prototype.slice.call(arguments).forEach(add);
      return output;
      function add(source) {
        if (Array.isArray(source)) {
          source.forEach(add);
          return this;
        }
        sources.push(source);
        source.once("end", remove.bind(null, source));
        source.once("error", output.emit.bind(output, "error"));
        source.pipe(output, { end: false });
        return this;
      }
      function isEmpty() {
        return sources.length == 0;
      }