travis作业失败,因为在严格模式外尚不支持“const”

我在努力解决我的公关问题 node restify travis job

./node_modules/.bin/nodeunit test/*.test.js
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/home/travis/build/restify/node-restify/node_modules/anumargak/node_modules/randexp/lib/randexp.js:4:16)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/home/travis/build/restify/node-restify/node_modules/anumargak/src/util.js:3:15)
    at Module._compile (module.js:409:26)
make: *** [test] Error 1
npmERR! Test failed.  See above for more details.

我已经放置了'use strict',删除了const关键字。但由于同样的原因,它仍在失败。我也试过在本地测试,结果通过了。

我该怎么修?

Here 是供参考的代码。