code: function getValidDeps(node) {
          if (!node || node.type !== 'ArrayExpression' || !node.elements) {
              return;
          }
  
          var deps = [];
  
          node.elements.some(function (elem) {
              if (elem.type === 'Literal') {
                  deps.push(elem.value);
              }
          });
  
          return deps.length ? deps : undefined;
      }
docs: Pulls out dependencies from an array literal with just string members.
  If string literals, will just return those string values in an array,
  skipping other items in the array.
  
  @param {Node} node an AST node.
  
  @returns {Array} an array of strings.
  If null is returned, then it means the input node was not a valid
  dependency.