>>34
ちゃんと読んでよね。

$ cat a.js
"use strict"
x = 1;

$ node a.js
x = 1;
^
ReferenceError: x is not defined
at Object.<anonymous> (/tmp/a.js:3:3)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:901:3