Method warn

src/Logger.js:15–21

* Logs a warning. * @param {Object} node AAST node that caused the warning * @param {String} msg Warning message itself * @param {String} type Name of the transform

(node, msg, type)

   * @param  {String} type Name of the transform
   */
  warn(node, msg, type) {
    this.warnings.push({
      line: node.loc ? node.loc.start.line : 0,
      msg,
      type,
    });
  }

  /**
   * Returns list of all the warnings