code: function isRequire(decl) {
              return decl.init && decl.init.type === "CallExpression" && decl.init.callee.name === "require";
          }
docs: Check if a variable declaration is a require.
  @param {ASTNode} decl variable declaration Node
  @returns {bool} if decl is a require, return true; else return false.
  @private