W20170316-08:18:14.034(0)? (STDERR) /xxxxxx/node_modules/promish/lib/promish-class.js:12
W20170316-08:18:14.066(0)? (STDERR)   class Promish extends Base {
W20170316-08:18:14.066(0)? (STDERR)   ^^^^^
W20170316-08:18:14.066(0)? (STDERR) 
W20170316-08:18:14.066(0)? (STDERR) SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
W20170316-08:18:14.067(0)? (STDERR)     at exports.runInThisContext (vm.js:53:16)
W20170316-08:18:14.067(0)? (STDERR)     at Module._compile (module.js:373:25)
W20170316-08:18:14.067(0)? (STDERR)     at Object.Module._extensions..js (module.js:416:10)
W20170316-08:18:14.067(0)? (STDERR)     at Module.load (module.js:343:32)
W20170316-08:18:14.068(0)? (STDERR)     at Function.Module._load (module.js:300:12)
W20170316-08:18:14.068(0)? (STDERR)     at Module.require (module.js:353:17)
W20170316-08:18:14.068(0)? (STDERR)     at require (internal/module.js:12:17)
W20170316-08:18:14.068(0)? (STDERR)     at Object.<anonymous> (/xxxxxx/node_modules/promish/lib/promish.js:4:18)
W20170316-08:18:14.068(0)? (STDERR)     at Module._compile (module.js:409:26)
W20170316-08:18:14.068(0)? (STDERR)     at Object.Module._extensions..js (module.js:416:10)
=> Exited with code: 1