Method join

lib/source-node.js:258–272

* Like `String.prototype.join` except for SourceNodes. Inserts `aStr` between * each of `this.children`. * * @param aSep The separator.

(aSep)

   * @param aSep The separator.
   */
  join(aSep) {
    let newChildren;
    let i;
    const len = this.children.length;
    if (len > 0) {
      newChildren = [];
      for (i = 0; i < len - 1; i++) {
        newChildren.push(this.children[i]);
        newChildren.push(aSep);
      }
      newChildren.push(this.children[i]);
      this.children = newChildren;
    }
    return this;
  }

  /**
   * Call String.prototype.replace on the very right-most source snippet. Useful