code: function isBemDecl(node) {
      if (node.type !== 'CallExpression') {
          return false;
      }
  
      if (node.callee.type !== 'MemberExpression') {
          return false;
      }
  
      if (node.callee.property.type !== 'Identifier' || node.callee.property.name !== 'decl') {
          return false;
      }
  
      var obj = node.callee.object;
      if (obj.type === "Identifier") {
          return obj.name === "BEM";
      }
  
      if (obj.type === "MemberExpression") {
          if (obj.object.type !== "Identifier") {
              return false;
          }
  
          if (obj.object.name !== "BEM") {
              return false;
          }
  
          if (obj.property.type !== "Identifier") {
              return false;
          }
  
          return obj.property.name === "DOM";
      }
      return false;
  }
docs: Checks if AST node is `BEM.decl` or `BEM.DOM.decl` call.
  
  @param {Object} node Mozilla Parser API AST node